Database Users

Help creating a simple calculator!

Hello everyone I tried creating a simple calculator but when opening in my LWW it just force closes , so I am attaching the xmls and .java codes for your ready reference.
I am well versed in netbeans programming but new to android hence a helpful post will be really appreciated!
Bullet
MainActivity.java
Code:
package com.ptx.calcplus;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText txtNum1;
private EditText txtNum2;
private EditText txtAns;
double a = Double.parseDouble(txtNum1.getText().toString()) ;
double b = Double.parseDouble(txtNum2.getText().toString());
double c=0;
public void add(double a,double b)
{
c=a+b;
txtAns.setText(""+c);
return;
}
public void sub(double a,double b)
{
c=a-b;
txtAns.setText(""+c);
return;
}
public void div(double a,double b)
{
if(b==0)
{
txtAns.setText("Number 2 can't be 0!");
}
else{
c=a/b;
txtAns.setText(""+c);
return;
}
}
public void mul(double a,double b)
{
c=a*b;
txtAns.setText(""+c);
return;
}
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
strings.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">CalcPlus</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string name="btnPlus">+</string>
<string name="btnSub">-</string>
<string name="btnMul">*</string>
<string name="btnDiv">/</string>
<string name="txtNum2">Enter number 2 here</string>
<string name="txtNum1">Enter number 1 here</string>
<string name="txtAns">Result</string>
</resources>
activity_main.xml
Code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/btnMul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_alignParentLeft="true"
android:text="@string/btnMul"
android:onClick="mul" />
<Button
android:id="@+id/btnSub"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="127dp"
android:layout_toRightOf="@+id/btnMul"
android:text="@string/btnSub"
android:onClick="sub" />
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_toRightOf="@+id/btnSub"
android:text="@string/btnPlus"
android:onClick="add" />
<Button
android:id="@+id/btnDiv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnAdd"
android:layout_alignBottom="@+id/btnAdd"
android:layout_toRightOf="@+id/btnAdd"
android:text="@string/btnDiv"
android:onClick="div"/>
<EditText
android:id="@+id/txtNum2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/btnMul"
android:layout_alignLeft="@+id/btnMul"
android:layout_alignRight="@+id/btnDiv"
android:layout_marginBottom="90dp"
android:ems="10"
android:hint="@string/txtNum2"
android:inputType="numberDecimal" />
<EditText
android:id="@+id/txtNum1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/txtNum2"
android:layout_alignLeft="@+id/txtNum2"
android:layout_alignRight="@+id/txtNum2"
android:layout_marginBottom="39dp"
android:ems="10"
android:hint="@string/txtNum1"
android:inputType="numberDecimal" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/txtAns"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtNum2"
android:layout_alignRight="@+id/btnDiv"
android:layout_below="@+id/btnMul"
android:layout_marginTop="40dp"
android:ems="10"
android:enabled="false"
android:hint="@string/txtAns"
android:linksClickable="false" />
</RelativeLayout>
Manifest
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ptx.calcplus"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.ptx.calcplus.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

Hey BULLET, you seem to be on the right track but you've got a bit of tweaking to do.
Firstly, you need to tie all of your UI elements from XML to your activity. Do this in your on create method. My guess is that your force close is due to this line:
Code:
double a = Double.parseDouble(txtNum1.getText().toString()) ;
Your activity has no idea what txtNum1 is tied to, only that it is an EditText object. To set this up properly, keep your global edit text declarations and below is an example of what you'd add to your onCreate method:
Code:
txtNum1 = (EditText) findViewById(R.id.txtNum1);
You would need to do the same for your buttons and all of the elements that you have defined in your XML layout which you want to modify from your activity. (May I also suggest that you use a TextView instead of EditText to display the answer...)
Code:
Button buttonSubtract;
...
protected void onCreate(Bundle savedInstanceState) {
...
buttonSubtract = (Button) findViewById(R.id.btnSub);
...
}
You must also add methods for your buttons to wait for a click and perform the calculation methods you have written. To do this you would set up and onClickListener for each button.
I found TheNewBoston tutorials really handy when starting out. Here is an example of tying together the buttons and actions that they perform. It is very close to what you are trying to do.
http://www.youtube.com/watch?v=WjE-pWYElsE
Hope it helps. Feel free to ask any more questions.

Changed thing in accordance with video but still getting fc.
If possible could anyone paste the correct codes in my style?
BTW here are the code
strings.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">CalcPlus</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string name="btnp">+</string>
<string name="btns">-</string>
<string name="btnm">*</string>
<string name="btnd">/</string>
<string name="txt2">Enter number 2 here</string>
<string name="txt1">Enter number 1 here</string>
<string name="txta">Result</string>
</resources>
MainActivity.java
Code:
package com.ptx.calcplus;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText txtN1;
private EditText txtN2;
private EditText txtAn;
Button Add,Sub,Div,Mul;
double a=Double.parseDouble(txtN1.getText().toString());
double b=Double.parseDouble(txtN2.getText().toString());
double c=0;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Add= (Button) findViewById(R.id.btnAdd);
Sub= (Button) findViewById(R.id.btnSub);
Div= (Button) findViewById(R.id.btnDiv);
Mul= (Button) findViewById(R.id.btnMul);
txtN1= (EditText) findViewById(R.id.txtNum1);
txtN2= (EditText) findViewById(R.id.txtNum2);
txtAn= (EditText) findViewById(R.id.txtAns);
Add.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
c=a+b;
txtAn.setText(""+c);
}
});
Sub.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
c=a+b;
txtAn.setText(""+c);
}
});
Mul.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
c=a+b;
txtAn.setText(""+c);
}
});
Div.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
c=a+b;
txtAn.setText(""+c);
}
});
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
activity_main.xml
Code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/btnMul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_alignParentLeft="true"
android:text="@string/btnm"
android:onClick="mul" />
<Button
android:id="@+id/btnSub"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="127dp"
android:layout_toRightOf="@+id/btnMul"
android:text="@string/btns"
android:onClick="sub" />
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_toRightOf="@+id/btnSub"
android:text="@string/btnp"
android:onClick="add" />
<Button
android:id="@+id/btnDiv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnAdd"
android:layout_alignBottom="@+id/btnAdd"
android:layout_toRightOf="@+id/btnAdd"
android:text="@string/btnd"
android:onClick="div"/>
<EditText
android:id="@+id/txtNum2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/btnMul"
android:layout_alignLeft="@+id/btnMul"
android:layout_alignRight="@+id/btnDiv"
android:layout_marginBottom="90dp"
android:ems="10"
android:hint="@string/txt2"
android:inputType="numberDecimal" />
<EditText
android:id="@+id/txtNum1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/txtNum2"
android:layout_alignLeft="@+id/txtNum2"
android:layout_alignRight="@+id/txtNum2"
android:layout_marginBottom="39dp"
android:ems="10"
android:hint="@string/txt1"
android:inputType="numberDecimal" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/txtAns"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtNum2"
android:layout_alignRight="@+id/btnDiv"
android:layout_below="@+id/btnMul"
android:layout_marginTop="40dp"
android:ems="10"
android:enabled="false"
android:hint="@string/txta"
android:linksClickable="false" />
</RelativeLayout>
Please please help me out!

I've fixed it up a little and it runs perfectly on my phone.
MainActivity.java
Code:
package com.ptx.calcplus;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText txtN1;
private EditText txtN2;
private EditText txtAn;
private Button Add, Sub, Div, Mul;
double a = 0, b = 0, c = 0;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Add = (Button) findViewById(R.id.btnAdd);
Sub = (Button) findViewById(R.id.btnSub);
Div = (Button) findViewById(R.id.btnDiv);
Mul = (Button) findViewById(R.id.btnMul);
txtN1 = (EditText) findViewById(R.id.txtNum1);
txtN2 = (EditText) findViewById(R.id.txtNum2);
txtAn = (EditText) findViewById(R.id.txtAns);
Add.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
c = a + b;
txtAn.setText(""+c);
}
});
Sub.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
txtAn.setText(""+c);
}
});
Mul.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
c = a * b;
txtAn.setText(""+c);
}
});
Div.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
c = a / b;
txtAn.setText(""+c);
}
});
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
activity_main.xml
Code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="@+id/btnMul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_alignParentLeft="true"
android:text="@string/btnm"
android:onClick="mul" />
<Button
android:id="@+id/btnSub"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="127dp"
android:layout_toRightOf="@+id/btnMul"
android:text="@string/btns"
android:onClick="sub" />
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_toRightOf="@+id/btnSub"
android:text="@string/btnp"
android:onClick="add" />
<Button
android:id="@+id/btnDiv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnAdd"
android:layout_alignBottom="@+id/btnAdd"
android:layout_toRightOf="@+id/btnAdd"
android:text="@string/btnd"
android:onClick="div"/>
<EditText
android:id="@+id/txtNum2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/btnMul"
android:layout_alignLeft="@+id/btnMul"
android:layout_alignRight="@+id/btnDiv"
android:layout_marginBottom="90dp"
android:ems="10"
android:hint="@string/txt2"
android:inputType="numberDecimal" />
<EditText
android:id="@+id/txtNum1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/txtNum2"
android:layout_alignLeft="@+id/txtNum2"
android:layout_alignRight="@+id/txtNum2"
android:layout_marginBottom="39dp"
android:ems="10"
android:hint="@string/txt1"
android:inputType="numberDecimal" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/txtAns"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtNum2"
android:layout_alignRight="@+id/btnDiv"
android:layout_below="@+id/btnMul"
android:layout_marginTop="40dp"
android:ems="10"
android:enabled="false"
android:hint="@string/txta"
android:linksClickable="false" />
</RelativeLayout>
I haven't touched the other files. Hope you get it working.

Works perfectly thank you.
Just tried to add dialog and clear, exit buttons but getting fc again. Please look into . I am really excited to make my first app.
Thank you once again
MainActivity.java
Code:
package com.ptx.calcplus;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText txtN1;
private EditText txtN2;
private EditText txtAn;
private Button Add, Sub, Div, Mul, Clr, Ext;
private AlertDialog.Builder dlgAlert = new AlertDialog.Builder(this);
double a = 0, b = 0, c = 0;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Add = (Button) findViewById(R.id.btnAdd);
Sub = (Button) findViewById(R.id.btnSub);
Div = (Button) findViewById(R.id.btnDiv);
Mul = (Button) findViewById(R.id.btnMul);
Clr = (Button) findViewById(R.id.btnClr);
Ext = (Button) findViewById(R.id.btnExt);
txtN1 = (EditText) findViewById(R.id.txtNum1);
txtN2 = (EditText) findViewById(R.id.txtNum2);
txtAn = (EditText) findViewById(R.id.txtAns);
Add.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a+b;
txtAn.setText(""+c);
}
}
});
Sub.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a-b;
txtAn.setText(""+c);
}
}
});
Mul.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a*b;
txtAn.setText(""+c);
}
}
});
Div.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else if(b==0)
{
dlgAlert.setMessage("Number can not be zero");
dlgAlert.setTitle("Divider Zero!");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a+b;
txtAn.setText(""+c);
}
}
});
Clr.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
txtN1.setText("");
txtN2.setText("");
txtAn.setText("");
}
});
Ext.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
});
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
activity_main.xml
Code:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<Button
android:id="@+id/btnMul"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_alignParentLeft="true"
android:text="@string/btnm"
android:onClick="mul" />
<Button
android:id="@+id/btnSub"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_marginBottom="127dp"
android:layout_toRightOf="@+id/btnMul"
android:text="@string/btns"
android:onClick="sub" />
<Button
android:id="@+id/btnAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnSub"
android:layout_alignBottom="@+id/btnSub"
android:layout_toRightOf="@+id/btnSub"
android:text="@string/btnp"
android:onClick="add" />
<Button
android:id="@+id/btnDiv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/btnAdd"
android:layout_alignBottom="@+id/btnAdd"
android:layout_toRightOf="@+id/btnAdd"
android:text="@string/btnd"
android:onClick="div"/>
<EditText
android:id="@+id/txtNum2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/btnMul"
android:layout_alignLeft="@+id/btnMul"
android:layout_alignRight="@+id/btnDiv"
android:layout_marginBottom="90dp"
android:ems="10"
android:hint="@string/txt2"
android:inputType="numberDecimal" />
<EditText
android:id="@+id/txtNum1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/txtNum2"
android:layout_alignLeft="@+id/txtNum2"
android:layout_alignRight="@+id/txtNum2"
android:layout_marginBottom="39dp"
android:ems="10"
android:hint="@string/txt1"
android:inputType="numberDecimal" >
<requestFocus />
</EditText>
<EditText
android:id="@+id/txtAns"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/btnMul"
android:ems="10"
android:enabled="false"
android:hint="@string/txta"
android:linksClickable="false" />
<Button
android:id="@+id/btnClr"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/btnSub"
android:layout_below="@+id/txtAns"
android:layout_marginTop="21dp"
android:text="@string/btnc"
android:onClick="clr" />
<Button
android:id="@+id/btnExt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/btnClr"
android:layout_alignRight="@+id/txtAns"
android:text="@string/btne"
android:onClick="ext" />
</RelativeLayout>
Manifest
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ptx.calcplus"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.ptx.calcplus.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Strings.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">CalcPlus</string>
<string name="action_settings">Settings</string>
<string name="hello_world">Hello world!</string>
<string name="btnp">+</string>
<string name="btns">-</string>
<string name="btnm">*</string>
<string name="btnd">/</string>
<string name="txt2">Enter number 2 here</string>
<string name="txt1">Enter number 1 here</string>
<string name="txta">Result</string>
<string name="btnc">Clear</string>
<string name="btne">Exit</string>
</resources>
Please help me out!

Instead of having people fix your errors, how about posting your logcat so we can give you ideas on how to fix them. You won't learn how to debug by having other people do it for you. Also, on your exit button click, all you need to do is "finish();" the activity. You don't need to launch an intent because then your app technically never terminates.

zalez said:
Instead of having people fix your errors, how about posting your logcat so we can give you ideas on how to fix them. You won't learn how to debug by having other people do it for you. Also, on your exit button click, all you need to do is "finish();" the activity. You don't need to launch an intent because then your app technically never terminates.
Click to expand...
Click to collapse
So here is the logcat
Code:
04-23 10:31:20.509: E/Trace(3960): error opening trace file: No such file or directory (2)
04-23 10:32:31.009: E/AndroidRuntime(4130): ... 11 more

This is not the part of the logcat we need.
If you want to finish the activity from the Listener, use that:
Code:
MainActivity.this.finish();

nikwen said:
This is not the part of the logcat we need.
If you want to finish the activity from the Listener, use that:
Code:
MainActivity.this.finish();
Click to expand...
Click to collapse
Pl reply how to get a logcat in eclipse!!
Bullet

[==)BULLET(==] said:
Pl reply how to get a logcat in eclipse!!
Bullet
Click to expand...
Click to collapse
Check this: http://www.youtube.com/watch?v=2AHJsRKa_J8
Will have a closer look at your source code later.

nikwen said:
Check this: http://www.youtube.com/watch?v=2AHJsRKa_J8
Will have a closer look at your source code later.
Click to expand...
Click to collapse
Please put those Log.i(String String); in my code where ever it is appropriate.
Here is the whole logcat. Please help!
04-23 05:36:12.523: E/Trace(831): error opening trace file: No such file or directory (2)
04-23 05:36:12.863: D/AndroidRuntime(831): Shutting down VM
04-23 05:36:12.893: W/dalvikvm(831): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:36:12.953: E/AndroidRuntime(831): FATAL EXCEPTION: main
04-23 05:36:12.953: E/AndroidRuntime(831): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.os.Looper.loop(Looper.java:137)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:36:12.953: E/AndroidRuntime(831): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:36:12.953: E/AndroidRuntime(831): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:36:12.953: E/AndroidRuntime(831): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:36:12.953: E/AndroidRuntime(831): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:36:12.953: E/AndroidRuntime(831): at dalvik.system.NativeStart.main(Native Method)
04-23 05:36:12.953: E/AndroidRuntime(831): Caused by: java.lang.NullPointerException
04-23 05:36:12.953: E/AndroidRuntime(831): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:36:12.953: E/AndroidRuntime(831): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:17)
04-23 05:36:12.953: E/AndroidRuntime(831): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:36:12.953: E/AndroidRuntime(831): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:36:12.953: E/AndroidRuntime(831): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:36:12.953: E/AndroidRuntime(831): ... 11 more
04-23 05:36:38.723: I/Process(831): Sending signal. PID: 831 SIG: 9
04-23 05:36:56.583: D/AndroidRuntime(867): Shutting down VM
04-23 05:36:56.644: W/dalvikvm(867): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:36:56.673: E/AndroidRuntime(867): FATAL EXCEPTION: main
04-23 05:36:56.673: E/AndroidRuntime(867): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.os.Looper.loop(Looper.java:137)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:36:56.673: E/AndroidRuntime(867): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:36:56.673: E/AndroidRuntime(867): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:36:56.673: E/AndroidRuntime(867): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:36:56.673: E/AndroidRuntime(867): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:36:56.673: E/AndroidRuntime(867): at dalvik.system.NativeStart.main(Native Method)
04-23 05:36:56.673: E/AndroidRuntime(867): Caused by: java.lang.NullPointerException
04-23 05:36:56.673: E/AndroidRuntime(867): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:36:56.673: E/AndroidRuntime(867): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:17)
04-23 05:36:56.673: E/AndroidRuntime(867): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:36:56.673: E/AndroidRuntime(867): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:36:56.673: E/AndroidRuntime(867): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:36:56.673: E/AndroidRuntime(867): ... 11 more
04-23 05:37:00.153: I/Process(867): Sending signal. PID: 867 SIG: 9
04-23 05:37:16.343: E/Trace(884): error opening trace file: No such file or directory (2)
04-23 05:37:16.564: D/AndroidRuntime(884): Shutting down VM
04-23 05:37:16.564: W/dalvikvm(884): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:37:16.613: E/AndroidRuntime(884): FATAL EXCEPTION: main
04-23 05:37:16.613: E/AndroidRuntime(884): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.os.Looper.loop(Looper.java:137)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:37:16.613: E/AndroidRuntime(884): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:37:16.613: E/AndroidRuntime(884): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:37:16.613: E/AndroidRuntime(884): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:37:16.613: E/AndroidRuntime(884): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:37:16.613: E/AndroidRuntime(884): at dalvik.system.NativeStart.main(Native Method)
04-23 05:37:16.613: E/AndroidRuntime(884): Caused by: java.lang.NullPointerException
04-23 05:37:16.613: E/AndroidRuntime(884): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:37:16.613: E/AndroidRuntime(884): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:17)
04-23 05:37:16.613: E/AndroidRuntime(884): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:37:16.613: E/AndroidRuntime(884): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:37:16.613: E/AndroidRuntime(884): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:37:16.613: E/AndroidRuntime(884): ... 11 more
04-23 05:38:20.383: D/AndroidRuntime(946): Shutting down VM
04-23 05:38:20.383: W/dalvikvm(946): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:38:20.444: E/AndroidRuntime(946): FATAL EXCEPTION: main
04-23 05:38:20.444: E/AndroidRuntime(946): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.os.Looper.loop(Looper.java:137)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:38:20.444: E/AndroidRuntime(946): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:38:20.444: E/AndroidRuntime(946): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:38:20.444: E/AndroidRuntime(946): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:38:20.444: E/AndroidRuntime(946): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:38:20.444: E/AndroidRuntime(946): at dalvik.system.NativeStart.main(Native Method)
04-23 05:38:20.444: E/AndroidRuntime(946): Caused by: java.lang.NullPointerException
04-23 05:38:20.444: E/AndroidRuntime(946): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:38:20.444: E/AndroidRuntime(946): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:17)
04-23 05:38:20.444: E/AndroidRuntime(946): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:38:20.444: E/AndroidRuntime(946): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:38:20.444: E/AndroidRuntime(946): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:38:20.444: E/AndroidRuntime(946): ... 11 more
04-23 05:50:13.903: E/Trace(1245): error opening trace file: No such file or directory (2)
04-23 05:50:14.063: D/AndroidRuntime(1245): Shutting down VM
04-23 05:50:14.103: W/dalvikvm(1245): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:50:14.133: E/AndroidRuntime(1245): FATAL EXCEPTION: main
04-23 05:50:14.133: E/AndroidRuntime(1245): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.os.Looper.loop(Looper.java:137)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:50:14.133: E/AndroidRuntime(1245): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:50:14.133: E/AndroidRuntime(1245): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:50:14.133: E/AndroidRuntime(1245): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:50:14.133: E/AndroidRuntime(1245): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:50:14.133: E/AndroidRuntime(1245): at dalvik.system.NativeStart.main(Native Method)
04-23 05:50:14.133: E/AndroidRuntime(1245): Caused by: java.lang.NullPointerException
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:50:14.133: E/AndroidRuntime(1245): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:17)
04-23 05:50:14.133: E/AndroidRuntime(1245): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:50:14.133: E/AndroidRuntime(1245): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:50:14.133: E/AndroidRuntime(1245): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:50:14.133: E/AndroidRuntime(1245): ... 11 more
04-23 05:50:14.223: I/Process(1245): Sending signal. PID: 1245 SIG: 9
04-23 05:50:24.554: E/Trace(1262): error opening trace file: No such file or directory (2)
04-23 05:50:24.754: D/AndroidRuntime(1262): Shutting down VM
04-23 05:50:24.764: W/dalvikvm(1262): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:50:24.814: E/AndroidRuntime(1262): FATAL EXCEPTION: main
04-23 05:50:24.814: E/AndroidRuntime(1262): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.os.Looper.loop(Looper.java:137)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:50:24.814: E/AndroidRuntime(1262): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:50:24.814: E/AndroidRuntime(1262): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:50:24.814: E/AndroidRuntime(1262): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:50:24.814: E/AndroidRuntime(1262): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:50:24.814: E/AndroidRuntime(1262): at dalvik.system.NativeStart.main(Native Method)
04-23 05:50:24.814: E/AndroidRuntime(1262): Caused by: java.lang.NullPointerException
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:50:24.814: E/AndroidRuntime(1262): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:17)
04-23 05:50:24.814: E/AndroidRuntime(1262): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:50:24.814: E/AndroidRuntime(1262): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:50:24.814: E/AndroidRuntime(1262): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:50:24.814: E/AndroidRuntime(1262): ... 11 more
04-23 05:53:39.893: E/Trace(1352): error opening trace file: No such file or directory (2)
04-23 05:53:40.044: D/AndroidRuntime(1352): Shutting down VM
04-23 05:53:40.044: W/dalvikvm(1352): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:53:40.063: E/AndroidRuntime(1352): FATAL EXCEPTION: main
04-23 05:53:40.063: E/AndroidRuntime(1352): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.os.Looper.loop(Looper.java:137)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:53:40.063: E/AndroidRuntime(1352): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:53:40.063: E/AndroidRuntime(1352): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:53:40.063: E/AndroidRuntime(1352): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:53:40.063: E/AndroidRuntime(1352): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:53:40.063: E/AndroidRuntime(1352): at dalvik.system.NativeStart.main(Native Method)
04-23 05:53:40.063: E/AndroidRuntime(1352): Caused by: java.lang.NullPointerException
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:53:40.063: E/AndroidRuntime(1352): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:17)
04-23 05:53:40.063: E/AndroidRuntime(1352): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:53:40.063: E/AndroidRuntime(1352): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:53:40.063: E/AndroidRuntime(1352): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:53:40.063: E/AndroidRuntime(1352): ... 11 more
04-23 05:53:40.106: I/Process(1352): Sending signal. PID: 1352 SIG: 9
04-23 05:57:17.853: D/AndroidRuntime(1452): Shutting down VM
04-23 05:57:17.853: W/dalvikvm(1452): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-23 05:57:17.873: E/AndroidRuntime(1452): FATAL EXCEPTION: main
04-23 05:57:17.873: E/AndroidRuntime(1452): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ptx.calcplus/com.ptx.calcplus.MainActivity}: java.lang.NullPointerException
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.ActivityThread.access$600(ActivityThread.java:141)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.os.Looper.loop(Looper.java:137)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-23 05:57:17.873: E/AndroidRuntime(1452): at java.lang.reflect.Method.invokeNative(Native Method)
04-23 05:57:17.873: E/AndroidRuntime(1452): at java.lang.reflect.Method.invoke(Method.java:511)
04-23 05:57:17.873: E/AndroidRuntime(1452): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-23 05:57:17.873: E/AndroidRuntime(1452): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-23 05:57:17.873: E/AndroidRuntime(1452): at dalvik.system.NativeStart.main(Native Method)
04-23 05:57:17.873: E/AndroidRuntime(1452): Caused by: java.lang.NullPointerException
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.content.ContextWrapper.getApplicationInfo(ContextWrapper.java:140)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.view.ContextThemeWrapper.getTheme(ContextThemeWrapper.java:103)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.AlertDialog.resolveDialogTheme(AlertDialog.java:143)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.AlertDialog$Builder.<init>(AlertDialog.java:360)
04-23 05:57:17.873: E/AndroidRuntime(1452): at com.ptx.calcplus.MainActivity.<init>(MainActivity.java:18)
04-23 05:57:17.873: E/AndroidRuntime(1452): at java.lang.Class.newInstanceImpl(Native Method)
04-23 05:57:17.873: E/AndroidRuntime(1452): at java.lang.Class.newInstance(Class.java:1319)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
04-23 05:57:17.873: E/AndroidRuntime(1452): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
04-23 05:57:17.873: E/AndroidRuntime(1452): ... 11 more
Click to expand...
Click to collapse

[==)BULLET(==] said:
Please put those Log.i(String String); in my code where ever it is appropriate.
Here is the whole logcat. Please help!
Click to expand...
Click to collapse
They are not needed. I just wanted to show you how to get the log.
I will check the code later on my computer.
Thanks for the log.
---------- Post added at 03:04 PM ---------- Previous post was at 02:10 PM ----------
[==)BULLET(==] said:
Works perfectly thank you.
Just tried to add dialog and clear, exit buttons but getting fc again. Please look into . I am really excited to make my first app.
Thank you once again
MainActivity.java
Code:
package com.ptx.calcplus;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText txtN1;
private EditText txtN2;
private EditText txtAn;
private Button Add, Sub, Div, Mul, Clr, Ext;
private AlertDialog.Builder dlgAlert = new AlertDialog.Builder(this);
double a = 0, b = 0, c = 0;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Add = (Button) findViewById(R.id.btnAdd);
Sub = (Button) findViewById(R.id.btnSub);
Div = (Button) findViewById(R.id.btnDiv);
Mul = (Button) findViewById(R.id.btnMul);
Clr = (Button) findViewById(R.id.btnClr);
Ext = (Button) findViewById(R.id.btnExt);
txtN1 = (EditText) findViewById(R.id.txtNum1);
txtN2 = (EditText) findViewById(R.id.txtNum2);
txtAn = (EditText) findViewById(R.id.txtAns);
Add.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a+b;
txtAn.setText(""+c);
}
}
});
Sub.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a-b;
txtAn.setText(""+c);
}
}
});
Mul.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a*b;
txtAn.setText(""+c);
}
}
});
Div.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
if(txtN1.getText().toString().isEmpty()||txtN2.getText().toString().isEmpty()){
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else if(b==0)
{
dlgAlert.setMessage("Number can not be zero");
dlgAlert.setTitle("Divider Zero!");
dlgAlert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {}});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
}
else{
c=a+b;
txtAn.setText(""+c);
}
}
});
Clr.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
txtN1.setText("");
txtN2.setText("");
txtAn.setText("");
}
});
Ext.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_HOME);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}
});
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Please help me out!
Click to expand...
Click to collapse
It is a similar mistake. You cannot do anything related with Android views in your field declarations.
You need to do it in your onCreate method, if you load the layout from a xml, after the setContentView method. So change it to this:
MainActivity.java
Code:
package com.ptx.calcplus;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText txtN1;
private EditText txtN2;
private EditText txtAn;
private Button Add, Sub, Div, Mul, Clr, Ext;
private AlertDialog.Builder dlgAlert;
double a = 0, b = 0, c = 0;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Add = (Button) findViewById(R.id.btnAdd);
... //your other stuff
dlgAlert = new AlertDialog.Builder(this);
...
This should work. Try it.

You're targetting min sdk of 8, which doesn't allow checking if string ".isEmpty()", which IF I'M NOT WRONG, is not included in older version of Android due to different version of Java. So I've changed it to check if the length is less than 0 before calculating.
Code:
.length() < 1
Secondly, you're converting the values of the Textbox BEFORE you check if the input is empty or not. Check before converting. Because if your input is empty, it is unable to convert a NULL into a double.
Lastly, one small error. Your DIVIDE is still PLUS. I've corrected it for you.
Sorry for the late reply! Hope there ain't any error.
Oh, one small tip. Try reading up "Try and Catch" for Android. Good for preventing force closing of apps.
Code:
package com.example.caltest;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
private EditText txtN1;
private EditText txtN2;
private EditText txtAn;
private Button Add, Sub, Div, Mul, Clr, Ext;
private AlertDialog.Builder dlgAlert;
double a = 0, b = 0, c = 0;
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
dlgAlert = new AlertDialog.Builder(MainActivity.this);
Add = (Button) findViewById(R.id.btnAdd);
Sub = (Button) findViewById(R.id.btnSub);
Div = (Button) findViewById(R.id.btnDiv);
Mul = (Button) findViewById(R.id.btnMul);
Clr = (Button) findViewById(R.id.btnClr);
Ext = (Button) findViewById(R.id.btnExt);
txtN1 = (EditText) findViewById(R.id.txtNum1);
txtN2 = (EditText) findViewById(R.id.txtNum2);
txtAn = (EditText) findViewById(R.id.txtAns);
Add.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
if (txtN1.getText().toString().length() < 1
|| txtN2.getText().toString().length() < 1) {
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
}
});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
} else {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
c = a + b;
txtAn.setText("" + c);
}
}
});
Sub.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
if (txtN1.getText().toString().length() < 1
|| txtN2.getText().toString().length() < 1) {
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
}
});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
} else {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
c = a - b;
txtAn.setText("" + c);
}
}
});
Mul.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
if (txtN1.getText().toString().length() < 1
|| txtN2.getText().toString().length() < 1) {
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
}
});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
} else {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
c = a * b;
txtAn.setText("" + c);
}
}
});
Div.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
if (txtN1.getText().toString().length() < 1
|| txtN2.getText().toString().length() < 1) {
dlgAlert.setMessage("Please enter number in text box!");
dlgAlert.setTitle("Enter Number");
dlgAlert.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
}
});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
} else if (b == 0) {
dlgAlert.setMessage("Number can not be zero");
dlgAlert.setTitle("Divider Zero!");
dlgAlert.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
}
});
dlgAlert.setCancelable(true);
dlgAlert.create().show();
} else {
a = Double.parseDouble(txtN1.getText().toString());
b = Double.parseDouble(txtN2.getText().toString());
c = a/b;
txtAn.setText("" + c);
}
}
});
Clr.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
txtN1.setText("");
txtN2.setText("");
txtAn.setText("");
}
});
Ext.setOnClickListener(new View.OnClickListener() {
[user=439709]@override[/user]
public void onClick(View arg0) {
finish();
}
});
}
[user=439709]@override[/user]
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

@nikwen @frenzyboi
Thank you to both of you from the bottom of my heart.
Really feeling awesome after seeing my first app running and rocking.
Any tips for what to do next?
Once again thank you to both of you!!
Sincere Regards
Bullet

[==)BULLET(==] said:
@nikwen @frenzyboi
Thank you both of you from the bottom of my heart.
Real feeling awesome after seeing my first app running and rocking.
Any tips for what to do next?
Once again thank you to both of you!!
Sincere Regards
Bullet
Click to expand...
Click to collapse
You are welcome.
My tips (because you asked me ):
I have started many projects and finished few of them.
The point is: Make an app you NEED or one you think of "That would be VERY cool".
The ones I have needed have always been the ones I have finished.
Good luck.
(Maybe consider creating a game or build an app that does annoying things automatically which you normally have to do yourself.)

nikwen said:
You are welcome.
My tips (because you asked me ):
I have started many projects and finished few of them.
The point is: Make an app you NEED or one you think of "That would be VERY cool".
The ones I have needed have always been the ones I have finished.
Good luck.
(Maybe consider creating a game or build an app that does annoying things automatically which you normally have to do yourself.)
Click to expand...
Click to collapse
I agree with nikwen. The apps you use will be the apps you finish. My advice to you would be to start your calculator over. Try to do it from start to finish and add features or improve on ones you currently have. For instance, add a feature that logs your input and calculation similar to the calculators that print on what they are doing on paper. Once you get the basics down, then you should move on to something more advanced.
Learn and love your logcats. It will help you so much in the debug process.

[Q] What is wrong with my project?

Hi all, I'm fairly new to Java and my overall coding skills are not as advanced as I'd like them to be but I really would appreciate it if someone could help me with this problem.
My first goal is to code an application for Android which measures the acceleration (X, Y, Z directions) and displays the values in a TextView.
There will be other user configurable options like unit conversion or limits with audio warnings etc. later on.
Right now I only have a few lines of code and the application already force closes right after starting.
I am posting my MainActivity.java, my activity_main.xml and the sensoractivity2 Manifest. Please point me in the right direction!
MainActivity.java:
Code:
package com.example.sensoractivity2;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends Activity implements SensorEventListener{
private SensorManager sensorManager;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sensorManager=(SensorManager) getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}
public void onSensorChanged(SensorEvent event) {
float x, y, z = 0;
if (event.sensor.getType()==Sensor.TYPE_ACCELEROMETER) {
x=event.values[0];
y=event.values[1];
z=event.values[2];
TextView tx = (TextView) findViewById(R.id.textView1);
tx.setText((int) x);
TextView ty = (TextView) findViewById(R.id.textView2);
ty.setText((int) y);
TextView tz = (TextView) findViewById(R.id.textView3);
tz.setText((int) z);
}
}
[user=439709]@override[/user]
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
}
activity_main.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="X-Wert" />
<TextView
android:id="@+id/textView2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Y-Wert" />
<TextView
android:id="@+id/textView3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="Z-Wert" />
</LinearLayout>
sensoractivity2 Manifest:
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sensoractivity2"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="8"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme">
<activity android:name="com.example.sensoractivity2.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>

First thing I see is that you are not setting your view in your activity classes "oncreate" method. Can you post your logcat output when the app force closes? That will help the most.

Could you please post a logcat?
Just the lines of your app. Get it using the logcat view in Eclipse.

Look at the bold for changes that will help you. When you are working with view objects, you shouldn't create the object in a listener or something that is called over and over. You will be creating a memory leak.
Code:
package com.example.sensoractivity2;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends Activity implements SensorEventListener{
private SensorManager sensorManager;
[B]TextView tx = null;
TextView ty = null;
TextView tz = null;[/B]
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sensorManager=(SensorManager) getSystemService(SENSOR_SERVICE);
[B] setContentView(R.layout.activity_main);[/B]
sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
[B]tx = (TextView) findViewById(R.id.textView1);
ty = (TextView) findViewById(R.id.textView2);
tz = (TextView) findViewById(R.id.textView3);[/B]
}
public void onSensorChanged(SensorEvent event) {
float x, y, z = 0;
if (event.sensor.getType()==Sensor.TYPE_ACCELEROMETER) {
x=event.values[0];
y=event.values[1];
z=event.values[2];
[B]tx.setText((int) x);
ty.setText((int) y);
tz.setText((int) z);[/B]
}
}
[user=439709]@override[/user]
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
}

Here is the part of the catlog which I believe to be relevant when the crash occurs:
Code:
04-28 18:34:24.628: E/SurfaceFlinger(36): ro.sf.lcd_density must be defined as a build property
04-28 18:34:25.750: E/Trace(1735): error opening trace file: No such file or directory (2)
04-28 18:34:27.452: I/ARMAssembler(36): generated scanline__00000077:03515104_00009002_00000000 [127 ipp] (149 ins) at [0x40f081f0:0x40f08444] in 34521256 ns
04-28 18:34:29.430: I/Choreographer(1153): Skipped 388 frames! The application may be doing too much work on its main thread.
04-28 18:34:29.462: I/ARMAssembler(36): generated scanline__00000077:03010104_00008002_00000000 [ 89 ipp] (110 ins) at [0x40f08450:0x40f08608] in 17654283 ns
04-28 18:34:30.825: W/ActivityManager(1003): Launch timeout has expired, giving up wake lock!
04-28 18:34:31.673: D/AndroidRuntime(1735): Shutting down VM
04-28 18:34:31.673: W/dalvikvm(1735): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-28 18:34:31.737: E/AndroidRuntime(1735): FATAL EXCEPTION: main
04-28 18:34:31.737: E/AndroidRuntime(1735): java.lang.NullPointerException
04-28 18:34:31.737: E/AndroidRuntime(1735): at com.example.sensoractivity2.MainActivity.onSensorChanged(MainActivity.java:27)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.hardware.SystemSensorManager$ListenerDelegate$1.handleMessage(SystemSensorManager.java:204)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.os.Looper.loop(Looper.java:137)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-28 18:34:31.737: E/AndroidRuntime(1735): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 18:34:31.737: E/AndroidRuntime(1735): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 18:34:31.737: E/AndroidRuntime(1735): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-28 18:34:31.737: E/AndroidRuntime(1735): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-28 18:34:31.737: E/AndroidRuntime(1735): at dalvik.system.NativeStart.main(Native Method)
04-28 18:34:31.813: W/ActivityManager(1003): Force finishing activity com.example.sensoractivity2/.MainActivity
04-28 18:34:31.893: W/WindowManager(1003): Failure taking screenshot for (328x583) to layer 21010
04-28 18:34:32.643: D/dalvikvm(1003): GC_FOR_ALLOC freed 588K, 26% free 7082K/9496K, paused 471ms, total 481ms
Thanks for your hints, zalez! Going to try that now.

The logcat states a nullpointer error. I believe my corrections will fix at least that error.
spelaben said:
Here is the part of the catlog which I believe to be relevant when the crash occurs:
Code:
04-28 18:34:24.628: E/SurfaceFlinger(36): ro.sf.lcd_density must be defined as a build property
04-28 18:34:25.750: E/Trace(1735): error opening trace file: No such file or directory (2)
04-28 18:34:27.452: I/ARMAssembler(36): generated scanline__00000077:03515104_00009002_00000000 [127 ipp] (149 ins) at [0x40f081f0:0x40f08444] in 34521256 ns
04-28 18:34:29.430: I/Choreographer(1153): Skipped 388 frames! The application may be doing too much work on its main thread.
04-28 18:34:29.462: I/ARMAssembler(36): generated scanline__00000077:03010104_00008002_00000000 [ 89 ipp] (110 ins) at [0x40f08450:0x40f08608] in 17654283 ns
04-28 18:34:30.825: W/ActivityManager(1003): Launch timeout has expired, giving up wake lock!
04-28 18:34:31.673: D/AndroidRuntime(1735): Shutting down VM
04-28 18:34:31.673: W/dalvikvm(1735): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
04-28 18:34:31.737: E/AndroidRuntime(1735): FATAL EXCEPTION: main
04-28 18:34:31.737: E/AndroidRuntime(1735): java.lang.NullPointerException
04-28 18:34:31.737: E/AndroidRuntime(1735): at com.example.sensoractivity2.MainActivity.onSensorChanged(MainActivity.java:27)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.hardware.SystemSensorManager$ListenerDelegate$1.handleMessage(SystemSensorManager.java:204)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.os.Looper.loop(Looper.java:137)
04-28 18:34:31.737: E/AndroidRuntime(1735): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-28 18:34:31.737: E/AndroidRuntime(1735): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 18:34:31.737: E/AndroidRuntime(1735): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 18:34:31.737: E/AndroidRuntime(1735): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-28 18:34:31.737: E/AndroidRuntime(1735): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-28 18:34:31.737: E/AndroidRuntime(1735): at dalvik.system.NativeStart.main(Native Method)
04-28 18:34:31.813: W/ActivityManager(1003): Force finishing activity com.example.sensoractivity2/.MainActivity
04-28 18:34:31.893: W/WindowManager(1003): Failure taking screenshot for (328x583) to layer 21010
04-28 18:34:32.643: D/dalvikvm(1003): GC_FOR_ALLOC freed 588K, 26% free 7082K/9496K, paused 471ms, total 481ms
Thanks for your hints, zalez! Going to try that now.
Click to expand...
Click to collapse

zalez said:
The logcat states a nullpointer error. I believe my corrections will fix at least that error.
Click to expand...
Click to collapse
True, nullpointer errors are fixed. After debugging it again, I'm getting these errors now:
Code:
04-28 19:07:59.466: E/AndroidRuntime(858): FATAL EXCEPTION: main
04-28 19:07:59.466: E/AndroidRuntime(858): android.content.res.Resources$NotFoundException: String resource ID #0x0
04-28 19:07:59.466: E/AndroidRuntime(858): at android.content.res.Resources.getText(Resources.java:230)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.widget.TextView.setText(TextView.java:3769)
04-28 19:07:59.466: E/AndroidRuntime(858): at com.example.sensoractivity2.MainActivity.onSensorChanged(MainActivity.java:33)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.hardware.SystemSensorManager$ListenerDelegate$1.handleMessage(SystemSensorManager.java:204)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.os.Looper.loop(Looper.java:137)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-28 19:07:59.466: E/AndroidRuntime(858): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 19:07:59.466: E/AndroidRuntime(858): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 19:07:59.466: E/AndroidRuntime(858): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-28 19:07:59.466: E/AndroidRuntime(858): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-28 19:07:59.466: E/AndroidRuntime(858): at dalvik.system.NativeStart.main(Native Method)
Any ideas?

spelaben said:
True, nullpointer errors are fixed. After debugging it again, I'm getting these errors now:
Code:
04-28 19:07:59.466: E/AndroidRuntime(858): FATAL EXCEPTION: main
04-28 19:07:59.466: E/AndroidRuntime(858): android.content.res.Resources$NotFoundException: String resource ID #0x0
04-28 19:07:59.466: E/AndroidRuntime(858): at android.content.res.Resources.getText(Resources.java:230)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.widget.TextView.setText(TextView.java:3769)
04-28 19:07:59.466: E/AndroidRuntime(858): at com.example.sensoractivity2.MainActivity.onSensorChanged(MainActivity.java:33)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.hardware.SystemSensorManager$ListenerDelegate$1.handleMessage(SystemSensorManager.java:204)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.os.Handler.dispatchMessage(Handler.java:99)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.os.Looper.loop(Looper.java:137)
04-28 19:07:59.466: E/AndroidRuntime(858): at android.app.ActivityThread.main(ActivityThread.java:5041)
04-28 19:07:59.466: E/AndroidRuntime(858): at java.lang.reflect.Method.invokeNative(Native Method)
04-28 19:07:59.466: E/AndroidRuntime(858): at java.lang.reflect.Method.invoke(Method.java:511)
04-28 19:07:59.466: E/AndroidRuntime(858): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
04-28 19:07:59.466: E/AndroidRuntime(858): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
04-28 19:07:59.466: E/AndroidRuntime(858): at dalvik.system.NativeStart.main(Native Method)
Any ideas?
Click to expand...
Click to collapse
It needs to be
Code:
tx.setText(String.valueOf(x));
ty.setText(String.valueOf(y));
tz.setText(String.valueOf(z));
If you pass an int, the TextView thinks that it is a resource id. That is why you need to convert it to a String first.

I over looked the bold part. When setting text for a Textview, it has to be in string format. There is no implied conversion.
Code:
package com.example.sensoractivity2;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends Activity implements SensorEventListener{
private SensorManager sensorManager;
TextView tx = null;
TextView ty = null;
TextView tz = null;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sensorManager=(SensorManager) getSystemService(SENSOR_SERVICE);
setContentView(R.layout.activity_main);
sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
tx = (TextView) findViewById(R.id.textView1);
ty = (TextView) findViewById(R.id.textView2);
tz = (TextView) findViewById(R.id.textView3);
}
public void onSensorChanged(SensorEvent event) {
float x, y, z = 0;
if (event.sensor.getType()==Sensor.TYPE_ACCELEROMETER) {
x=event.values[0];
y=event.values[1];
z=event.values[2];
tx.setText[B](Integer.toString(x)[/B]);
ty.setText([B]Integer.toString(y)[/B]);
tz.setText([B]Integer.toString(z)[/B]);
}
}
[user=439709]@override[/user]
public void onAccuracyChanged(Sensor arg0, int arg1) {
// TODO Auto-generated method stub
}
}

nikwen said:
It needs to be
Code:
tx.setText(String.valueOf(x));
ty.setText(String.valueOf(y));
tz.setText(String.valueOf(z));
If you pass an int, the TextView thinks that it is a resource id. That is why you need to convert it to a String first.
Click to expand...
Click to collapse
Yes! That did the trick! Now my next problem is that I only see one value instead of three, from there on I will try to move on by myself.

Sorry, I'm not sure if this is relevant, but you aren't overriding your onCreate method? Could that have anything to do with it?

MaartenXDA said:
Sorry, I'm not sure if this is relevant, but you aren't overriding your onCreate method? Could that have anything to do with it?
Click to expand...
Click to collapse
He does:
public void onCreate(Bundle savedInstanceState) {
Click to expand...
Click to collapse
He just did not wrote the @override annotation before that. As far as i know, you do not have to use it.
EDIT: Yep, it does not matter. See this: http://stackoverflow.com/questions/94361/when-do-you-use-javas-override-annotation-and-why
It says that it is just for ensuring that you are overriding the right method and for making the code easier to read.

Hi all, I am a bit further with my project since I found some time to work on it again.
//edit, force closes on starting fixed!
Here is what it is supposed to be doing: It reads the x, y and z values for acceleration from the LINEAR_ACCELERATION sensor. If a certain value is exceeded a timer will be started. If the amount of seconds the timer counts is higher than a defined threshold, it will play the default notifcation sound.
If the value from the sensor is below the threshold, it will stop the timer. The whole timer thing isn't working, the notification is played as soon as the normal acceleration threshold is passed and the time is ignored.
Please review my code below and tell me what I'm not seeing here, note that I'm still a noob.
Also I'm interested in a method to capture the maximum values read from the sensor and put it in a textview, can you help me?
AccelMeter.java:
Code:
package com.example.accelmeter;
import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.View;
import android.widget.Button;
import android.widget.Chronometer;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class AccelMeter extends Activity implements SensorEventListener {
private SensorManager sensorManager;
// Objekte deklarieren
TextView xC;
TextView yC;
TextView zC;
Chronometer chrono;
/* accThreshold = Schwellenwert in m/s² für die Beschleunigung
* accInterval = Zeitraum in Sekunden, über den der Wert für die Beschleunigung überwacht wird
*/
private float accThreshold = 50;
private float accInterval = 0;
[user=439709]@override[/user]
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_accel_meter);
// Achsen Objekte erstellen
xC=(TextView)findViewById(R.id.xCoordinate);
yC=(TextView)findViewById(R.id.yCoordinate);
zC=(TextView)findViewById(R.id.zCoordinate);
/* Sensor.TYPE_LINEAR_ACCELERATION = Beschleunigung auf jeder Achse ohne Gravitation in m/s²
* SENSOR_DELAY_FASTEST = schnellster Modus für Messung. Alternativen z.B. _GAME, _NORMAL oder _UI
*/
sensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this,
sensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION),
SensorManager.SENSOR_DELAY_NORMAL);
// Schwellenwert festlegen und mit einer Toast-Benachrichtigung bestätigen, Fehlerbehandlung wenn kein Wert eingegeben wurde
Button setThreshold = (Button)findViewById(R.id.setThreshold);
setThreshold.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
try {
EditText et = (EditText)findViewById(R.id.threshold);
accThreshold = Float.valueOf(et.getText().toString());
Toast.makeText(getApplicationContext(), "Neuer Schwellenwert festgelegt!", Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
Toast.makeText(getApplicationContext(), "Es wurde noch kein Wert eingegeben!", Toast.LENGTH_SHORT).show();
}
}
});
// Intervall festlegen und mit einer Toast-Benachrichtigung bestätigen, Fehlerbehandlung wenn kein Wert eingegeben wurde
Button setInterval = (Button)findViewById(R.id.setInterval);
setInterval.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
try {
EditText et = (EditText)findViewById(R.id.editInterval);
accInterval = Float.valueOf(et.getText().toString());
Toast.makeText(getApplicationContext(), "Neues Intervall festgelegt!", Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
Toast.makeText(getApplicationContext(), "Es wurde noch kein Wert eingegeben!", Toast.LENGTH_SHORT).show();
}
}
});
// Programm beenden
Button exit = (Button)findViewById(R.id.exit);
exit.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
finish();
System.exit(0);
}
});
}
public void onSensorChanged(SensorEvent event){
// Sensor Typ überprüfen
if(event.sensor.getType()==Sensor.TYPE_LINEAR_ACCELERATION){
// Richtungen verknüpfen
float x=event.values[0];
float y=event.values[1];
float z=event.values[2];
// Gerundete Ergebnisse mit vier Nachkommastellen ausgeben
xC.setText("X: "+(Math.abs(Math.round(x * 1000) / 1000.0)));
yC.setText("Y: "+(Math.abs(Math.round(y * 1000) / 1000.0)));
zC.setText("Z: "+(Math.abs(Math.round(z * 1000) / 1000.0)));
// Wenn Beschleunigung über Schwellenwert liegt, starte Timer. Wenn Timer das festgelete Intervall überschreitet, spiele Benachrichtigungston
if (x + y + z > accThreshold)
{
chrono = new Chronometer(this);
chrono.setBase(SystemClock.elapsedRealtime());
chrono.start();
long seconds = ((chrono.getBase()-SystemClock.elapsedRealtime()/1000%60));
if (seconds >= accInterval)
{
Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
Ringtone r = RingtoneManager.getRingtone(getApplicationContext(), notification);
r.play();
}
else
{
chrono.stop();
}
}
}
}
[user=439709]@override[/user]
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
}
activity_accel_meter.xml:
Code:
<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<TableRow tools:ignore="ExtraText" >
<TextView
android:id="@+id/xCoordinate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="X Koordinate: "
android:textAppearance="?android:attr/textAppearanceLarge"
tools:ignore="HardcodedText" />
/>
</TableRow>
<TableRow>
<TextView
android:id="@+id/yCoordinate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Y Koordinate: "
android:textAppearance="?android:attr/textAppearanceLarge"
tools:ignore="HardcodedText" />
/>
</TableRow>
<TableRow>
<TextView
android:id="@+id/zCoordinate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Z Koordinate: "
android:textAppearance="?android:attr/textAppearanceLarge"
tools:ignore="HardcodedText" />
/>
</TableRow>
<EditText
android:id="@+id/threshold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Schwellenwert (float)"
android:inputType="numberDecimal"
tools:ignore="HardcodedText" />
<Button
android:id="@+id/setThreshold"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Schwellenwert festlegen"
tools:ignore="HardcodedText" />
<EditText
android:id="@+id/editInterval"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:hint="Zeit in Sekunden"
android:inputType="number"
tools:ignore="HardcodedText" >
<requestFocus />
</EditText>
<Button
android:id="@+id/setInterval"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Zeitraum für Überwachung festlegen"
tools:ignore="HardcodedText" />
<Button
android:id="@+id/exit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Beenden"
tools:ignore="HardcodedText" />
</TableLayout>

Yay German code (live there, too) xD Initialise your seconds in your onCreate, it's much nicer and probably the problem. A method gets the highest value the sensor measured would be a simple
Code:
double savedVal=0; //or any other type
private void updateMaxVal(){
double currentVal =// get the value from the specific sensor
if(savedVal<currentVal) {
savedVal = currentVal;
// maybe save the time as well
}
You'd have to put that method in the onsensorchanged so it will be called often. Then update your text View with the new saved value

SimplicityApks said:
Yay German code (live there, too) xD Initialise your seconds in your onCreate, it's much nicer and probably the problem. A method gets the highest value the sensor measured would be a simple
Code:
double savedVal=0; //or any other type
private void updateMaxVal(){
double currentVal =// get the value from the specific sensor
if(savedVal<currentVal) {
savedVal = currentVal;
// maybe save the time as well
}
You'd have to put that method in the onsensorchanged so it will be called often. Then update your text View with the new saved value
Click to expand...
Click to collapse
Hey fellow German!
If I initialise the seconds variable in the onCreate part it says that the variable is not being used (yellow marking) and in the code below I get an error obviously stating that the variable is unknown. ^^
I have three different values, how can I link the x, y and z variables in the method and how can I make sure the variables are known inside of the method? (Same problem as above)

Since I don't know how to do it with a method I just wrote the following code in my onsensorchanged part, the problem is that the max value textviews always show the same as the current value textviews:
float savedValX = 0;
float savedValY = 0;
float savedValZ = 0;
float currentValX = event.values[0];
float currentValY = event.values[1];
float currentValZ = event.values[2];
if (savedValX < currentValX) {
savedValX = currentValX;
xM.setText("X max: "+(Math.abs(Math.round(currentValX * 1000) / 1000.0)));
}
if (savedValY < currentValY) {
savedValY = currentValY;
yM.setText("Y max: "+(Math.abs(Math.round(currentValY * 1000) / 1000.0)));
}
if (savedValZ < currentValZ) {
savedValZ = currentValZ;
zM.setText("Z max: "+(Math.abs(Math.round(currentValZ * 1000) / 1000.0)));
}
Also I still have the problem that my seconds interval is being ignored.
//edit, fixed it! Now I only need the max value method.

OK so I now understand what you are trying to do with your Chronometer, the problem is that you reinitialize it every time the onSensorChanged is called so if you then ask for the seconds it has just started. To fix this, you could set an onChronometerTickListener and set your textViews in that method. To avoid recreating the Chrono use
Code:
if(chrono==null){
chrono = new Chronometer();
chrono.start();
}
If u don't want the tick listener or it doesn't work ( haven't used it yet) you can put your if(seconds<...)in the else {}of above method. But remember that the onSensorChanged is called EVERYTIME the sensor registers a change, this might be very often or just sometimes, so there is no guarantee that the text views will be updated if the else clause in that method is used
PS forget about the initializing of the seconds, I don't know what I was thinking yesterday, but I guess it was too late ...
/*edit:
What I meant with
Code:
double savedVal=0; //or any other type
private void updateMaxVal(){
is that you save your value in your class ("globally"), so that it is accessible to the whole class.
and to do it nicely you can do it like this:
Code:
float savedValX = 0;
float savedValY = 0;
float savedValZ = 0;
boolean change = false;
private void updateMaxVals(SensorEvent event){ // call this method in your onSensorChanged
change = false;
savedValX = getMax(event.values[0], savedValX);
if(change){
xM.setText("X max: "+(Math.abs(Math.round(savedValX * 1000) / 1000.0)));
}
savedValY = getMax(event.values[1], savedValY);
if(change){
yM.setText("Y max: "+(Math.abs(Math.round(savedValY * 1000) / 1000.0)));
}
savedValZ = getMax(event.values[2], savedValZ);
if(change){
yM.setText("Z max: "+(Math.abs(Math.round(savedValZ * 1000) / 1000.0)));
}
}
private float getMax(float currentVal, float savedVal){
if(currentVal > savedVal){
change = true;
return currentVal;
}else{
change = false;
return savedVal;
}
}

Camera Preview

Im trying to start a simple app and i need to display on a SurfaceView the preview of the cam as soon as the App start.
i added the permission to the manifest:
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
and my code:
Code:
import android.content.Context;
import android.hardware.Camera;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
public class MainActivity extends SurfaceView implements SurfaceHolder.Callback{
SurfaceView mSurfaceView;
private SurfaceHolder mHolder;
public Camera camera = null;
public MainActivity(Context context) {
super(context);
mSurfaceView = (SurfaceView) findViewById(R.id.surfaceView);
mHolder = mSurfaceView.getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
[user=439709]@override[/user]
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
try{
camera.setPreviewDisplay(mHolder);
} catch(Exception e){
}
}
[user=439709]@override[/user]
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Camera.Parameters params = camera.getParameters();
params.setPreviewSize(width,height);
camera.setParameters(params);
camera.startPreview();
}
[user=439709]@override[/user]
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera = null;
}
}
Ive looked for many tutorial and all technically do the same or smiliart stuff. But the app crashes. I cant find a solution
LogCat
Code:
06-01 12:39:12.456 616-841/system_process I/ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.example.droidcam/.MainActivity bnds=[240,408][240,408]} from pid 861
06-01 12:39:12.596 616-841/system_process D/dalvikvm: GC_FOR_ALLOC freed 1352K, 16% free 11518K/13560K, paused 112ms, total 118ms
06-01 12:39:12.636 2744-2744/? D/dalvikvm: Late-enabling CheckJNI
06-01 12:39:12.646 616-881/system_process I/ActivityManager: Start proc com.example.droidcam for activity com.example.droidcam/.MainActivity: pid=2744 uid=10019 gids={50019, 1006, 1028}
06-01 12:39:12.746 2744-2744/com.example.droidcam E/Trace: error opening trace file: No such file or directory (2)
06-01 12:39:12.826 2744-2744/com.example.droidcam D/dalvikvm: newInstance failed: no <init>()
06-01 12:39:12.836 2744-2744/com.example.droidcam D/AndroidRuntime: Shutting down VM
06-01 12:39:12.836 2744-2744/com.example.droidcam W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x2b5d9930)
06-01 12:39:12.836 2744-2744/com.example.droidcam E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.droidcam/com.example.droidcam.MainActivity}: java.lang.InstantiationException: can't instantiate class com.example.droidcam.MainActivity; no empty constructor
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2223)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2357)
at android.app.ActivityThread.access$600(ActivityThread.java:153)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5226)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.InstantiationException: can't instantiate class com.example.droidcam.MainActivity; no empty constructor
at java.lang.Class.newInstanceImpl(Native Method)
at java.lang.Class.newInstance(Class.java:1319)
at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2214)
... 11 more
06-01 12:39:12.836 616-1341/system_process W/ActivityManager: Force finishing activity com.example.droidcam/.MainActivity
06-01 12:39:12.986 616-650/system_process D/dalvikvm: GC_FOR_ALLOC freed 1696K, 24% free 10472K/13772K, paused 76ms, total 77ms
06-01 12:39:13.387 616-647/system_process W/ActivityManager: Activity pause timeout for ActivityRecord{2bd8aff0 u0 com.example.droidcam/.MainActivity}
06-01 12:39:18.952 2744-2744/? I/Process: Sending signal. PID: 2744 SIG: 9
06-01 12:39:18.952 616-943/system_process I/ActivityManager: Process com.example.droidcam (pid 2744) has died.
06-01 12:39:19.002 616-616/system_process W/InputMethodManagerService: Window already focused, ignoring focus gain of: [email protected] attribute=null, token = [email protected]

Please put your code into code tags.
EDIT: Thanks.

and Post/check logcats.
just saying it crashes is too vague.

out of ideas said:
and Post/check logcats.
just saying it crashes is too vague.
Click to expand...
Click to collapse
On Eclipse i know how to show the windows of the LogCat, but cant really find it here on Android Studio.
Im a bit newby about this sorry, coming from PHP using just Notepad.
Guess i found it, added log cat
I saw some tutorial like this, im not sure why it doesnt start.
Is it for te onCreate method missing? but i saw that for other works anyway like this
Btw i've also triyed an other way, but stills give me errors. i could upload that one too, different logcat.
Hope one of the two could be solved
Code:
import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import java.io.IOException;
public class MainActivity extends Activity implements SurfaceHolder.Callback{
/* VARIABILI PRIVATE */
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
private Camera mCamera;
/** Called when the activity is first created. */
[user=439709]@override[/user]
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSurfaceView = (SurfaceView)findViewById(R.id.surfaceView);
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
[user=439709]@override[/user]
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
Camera.Parameters params = mCamera.getParameters();
params.setPreviewSize(arg2, arg3);
mCamera.setParameters(params);
try {
//lancio la preview
mCamera.setPreviewDisplay(arg0);
mCamera.startPreview();
} catch (IOException e) {
//gestione errore
}
}
[user=439709]@override[/user]
public void surfaceCreated(SurfaceHolder holder) {
mCamera = Camera.open();
}
[user=439709]@override[/user]
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mCamera.release();
}
logcat
Code:
06-01 13:32:31.187 616-661/system_process I/ActivityManager: Start proc com.android.vending for service com.android.vending/com.google.android.finsky.services.ContentSyncService: pid=25552 uid=10005 gids={50005, 3003, 1015, 1028}
06-01 13:32:31.227 25552-25552/com.android.vending E/Trace: error opening trace file: No such file or directory (2)
06-01 13:32:31.387 616-841/system_process I/ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10200000 cmp=com.example.droidcam/.MainActivity bnds=[240,408][240,408]} from pid 861
06-01 13:32:31.437 25566-25566/? D/dalvikvm: Late-enabling CheckJNI
06-01 13:32:31.447 616-1341/system_process I/ActivityManager: Start proc com.example.droidcam for activity com.example.droidcam/.MainActivity: pid=25566 uid=10019 gids={50019, 1006, 1028}
06-01 13:32:31.607 25566-25566/com.example.droidcam E/Trace: error opening trace file: No such file or directory (2)
06-01 13:32:31.787 25552-25552/com.android.vending D/Finsky: [1] FinskyApp.onCreate: Initializing network with DFE https://android.clients.google.com/fdfe/
06-01 13:32:31.987 25552-25552/com.android.vending D/Finsky: [1] DailyHygiene.goMakeHygieneIfDirty: No need to run daily hygiene.
06-01 13:32:32.037 25552-25552/com.android.vending W/Settings: Setting download_manager_max_bytes_over_mobile has moved from android.provider.Settings.Secure to android.provider.Settings.Global.
06-01 13:32:32.037 25552-25552/com.android.vending W/Settings: Setting download_manager_recommended_max_bytes_over_mobile has moved from android.provider.Settings.Secure to android.provider.Settings.Global.
06-01 13:32:32.178 616-881/system_process D/dalvikvm: GC_FOR_ALLOC freed 656K, 26% free 11321K/15124K, paused 82ms, total 86ms
06-01 13:32:32.238 25566-25566/com.example.droidcam D/libEGL: loaded /system/lib/egl/libEGL_adreno200.so
06-01 13:32:32.258 25566-25566/com.example.droidcam D/libEGL: loaded /system/lib/egl/libGLESv1_CM_adreno200.so
06-01 13:32:32.258 25566-25566/com.example.droidcam D/libEGL: loaded /system/lib/egl/libGLESv2_adreno200.so
06-01 13:32:32.268 25566-25566/com.example.droidcam I/Adreno200-EGL: <qeglDrvAPI_eglInitialize:294>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_JB.04.01.01.00.036_msm8960_JB_CL2644550_release_AU (CL2644550)
Build Date: 07/31/12 Tue
Local Branch:
Remote Branch: quic/master
Local Patches: NONE
Reconstruct Branch: AU_LINUX_ANDROID_JB.04.01.01.00.036 + NOTHING
06-01 13:32:32.318 25566-25566/com.example.droidcam D/OpenGLRenderer: Enabling debug mode 0
06-01 13:32:32.348 256-515/? I/AwesomePlayer: setDataSource_l(URL suppressed)
06-01 13:32:32.378 256-25622/? D/MediaExtractor: returning default extractor
06-01 13:32:32.388 256-515/? I/AwesomePlayer: setDataSource_l(URL suppressed)
06-01 13:32:32.408 256-25626/? D/MediaExtractor: returning default extractor
06-01 13:32:32.408 256-515/? I/CameraClient: Opening camera 0
06-01 13:32:32.408 256-515/? W/ServiceManager: Permission failure: com.sonyericsson.permission.CAMERA_EXTENDED from uid=10019 pid=25566
06-01 13:32:32.438 256-25630/? I/caladbolg: 3348999538 cald_camctrl.c (6713) 25630 P [SVR] -945967758 + Cald_CamCtrl_PowerUp
06-01 13:32:32.438 256-25630/? I/caladbolg: 3348999630 cald_camctrl.c (7484) 25630 P [SVR] -945967666 + Cald_CamCtrl_FSM_Func_PowerUp
06-01 13:32:32.438 256-25630/? I/caladbolg: 3349003170 cald_hal_qct.c (2789) 25630 P [HAL] -945964126 + Cald_Hal_Qct_If_PowerUp
06-01 13:32:32.438 256-25630/? I/caladbolg: 3349003323 cald_hal_qct.c (2847) 25630 P [HAL] -945963973 - Cald_Hal_Qct_If_PowerUp (0)
06-01 13:32:32.438 256-25630/? I/caladbolg: 3349004665 cald_camctrl.c (7563) 25630 P [SVR] -945962631 - Cald_CamCtrl_FSM_Func_PowerUp (0)
06-01 13:32:32.438 256-25630/? I/caladbolg: 3349004726 cald_camctrl.c (6720) 25630 P [SVR] -945962570 - Cald_CamCtrl_PowerUp (0)
06-01 13:32:32.448 256-25630/? E/caladbolg: 3349014431 cald_camctrl.c (11888) 25630 E [SVR] PreviewSize Invalid param: value[402x527]
06-01 13:32:32.458 25566-25566/com.example.droidcam D/AndroidRuntime: Shutting down VM
06-01 13:32:32.458 25566-25566/com.example.droidcam W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x2b5d9930)
06-01 13:32:32.488 25566-25566/com.example.droidcam E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.RuntimeException: setParameters failed
at android.hardware.Camera.native_setParameters(Native Method)
at android.hardware.Camera.setParameters(Camera.java:1496)
at com.example.droidcam.MainActivity.surfaceChanged(MainActivity.java:41)
at android.view.SurfaceView.updateWindow(SurfaceView.java:580)
at android.view.SurfaceView.access$000(SurfaceView.java:86)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:174)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:680)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1842)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
at android.view.Choreographer.doCallbacks(Choreographer.java:562)
at android.view.Choreographer.doFrame(Choreographer.java:532)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
at android.os.Handler.handleCallback(Handler.java:725)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5226)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
at dalvik.system.NativeStart.main(Native Method)
06-01 13:32:32.498 616-943/system_process W/ActivityManager: Force finishing activity com.example.droidcam/.MainActivity
06-01 13:32:32.688 25552-25552/com.android.vending D/Finsky: [1] 2.run: Loaded library for account: [i1YaFxIWaZrcOQ26zxNX5K0RvvY]
06-01 13:32:32.688 25552-25552/com.android.vending D/Finsky: [1] 2.run: Finished loading 1 libraries.
06-01 13:32:32.908 25552-25552/com.android.vending D/Finsky: [1] 5.onFinished: Installation state replication succeeded.
06-01 13:32:33.018 616-647/system_process W/ActivityManager: Activity pause timeout for ActivityRecord{2b946870 u0 com.example.droidcam/.MainActivity}

In Android you normally do not use the constructor of an Activity for anything.
Use the onCreate method instead.
EDIT: The log says that the constructor must be empty.

nikwen said:
In Android you normally do not use the constructor of an Activity for anything.
Use the onCreate method instead.
EDIT: The log says that the constructor must be empty.
Click to expand...
Click to collapse
I thought about that (even if i saw video tutorial doing it) so i tried wht onCreate method and now it seams to give problem with the setParameters?
Ive uploaded the new code and logcats before

Ah. Check this: http://stackoverflow.com/questions/3890381/camera-setparameters-failed-in-android

nikwen said:
Ah. Check this: http://stackoverflow.com/questions/3890381/camera-setparameters-failed-in-android
Click to expand...
Click to collapse
i tryed that at th beggin, and didnt work, in fact i tried it again and still give me the same error apparently

While I'm still learning myself, it looks like you are getting a failed camera permission. And then it tries to pass in an invalid parameter to the camera.
deniel said:
I/CameraClient: Opening camera 0
06-01 13:32:32.408 256-515/? W/ServiceManager: Permission failure: com.sonyericsson.permission.CAMERA_EXTENDED from uid=10019 pid=25566
06-01 13:32:32.448 256-25630/? E/caladbolg: 3349014431 cald_camctrl.c (11888) 25630 E [SVR] PreviewSize Invalid param: value[402x527]
[/CODE]
Click to expand...
Click to collapse
Sent from a Toasted Devil

netwokz said:
While I'm still learning myself, it looks like you are getting a failed camera permission. And then it tries to pass in an invalid parameter to the camera.
Sent from a Toasted Devil
Click to expand...
Click to collapse
But cant understand which one and how should i do. it ryed the 2 ways everybody does

What phone are you trying this on? Have you tried it in an emulator?

After getting home and I was able to try your second piece of code. It looks like it is a problem with <CODE>params.setPreviewSize(arg2, arg3);</CODE>, it doesn't like the width and height arguments. I found THIS(second answer). and after plugging it into your code it was working for me. If you like I can show you the modified code, altho its real easy to plug in.

netwokz said:
After getting home and I was able to try your second piece of code. It looks like it is a problem with <CODE>params.setPreviewSize(arg2, arg3);</CODE>, it doesn't like the width and height arguments. I found THIS(second answer). and after plugging it into your code it was working for me. If you like I can show you the modified code, altho its real easy to plug in.
Click to expand...
Click to collapse
i tryed his first example and finally i get his "distoted" image. When i'll have time ill try the rets thnk u very much
ill try this:
Code:
Camera.Size getBestPreviewSize(int width, int height, Camera.Parameters parameters) {
Camera.Size result=null;
float dr = Float.MAX_VALUE;
float ratio = (float)width/(float)height;
for (Camera.Size size : parameters.getSupportedPreviewSizes()) {
float r = (float)size.width/(float)size.height;
if( Math.abs(r - ratio) < dr && size.width <= width && size.height <= height ) {
dr = Math.abs(r - ratio);
result = size;
}
}
return result;
}
Code:
ublic void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
if (isPreviewRunning) {
mCamera.stopPreview();
}
Camera.Parameters parameters = mCamera.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size optimalSize = getBestPreviewSize( w, h, parameters);
parameters.setPreviewSize(optimalSize.width, optimalSize.height);
mCamera.setParameters(parameters);
mCamera.startPreview();
isPreviewRunning =true;
}
im not sure abot the 3rd parameter of the getBestPreviewSize method which one is it. Like this is still distorted

Yeah, I could never fix the distortion back when I was trying my camera app. But I think I will tinker with it again. Keep this updated if you find anything, I will also.
Sent from a Toasted Devil

[Q] java.lang.NullPointerException in Android Webservice

Hello everyone, me again.
I am having a little issue with my android app.
When I run the service on the phone, it starts just fine and when the call is disconnected it throws an java.lang.NullPointerException when i start the tareaEnviarABD.execute(); task.
This is the code of my service:
Code:
package com.trucka.llamadasdrivers;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.PropertyInfo;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.IBinder;
import android.provider.CallLog;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;
public class ServicioLlamadas extends Service {
TextView txtInformacion = null;
TextView txtDetalles = null;
TextView tv = null;
private String resultado;
String phNumber = null;
String callType = null;
String callDate = null;
DateFormat shortFecha = null;
DateFormat shortDF = null;
Date callDayTime = null;
Date fin = null;
String fechaLlamada1 = null;
String fechaLlamada2 = null;
String callDuration = null;
String dir = null;
public String tolo = null;
String imei = null;
String comentario = null;
String fechaRegistro = null;
String insercion = null;
String fechaInicio = null;
String fechaFin = null;
String estadoLlamada = null;
private static ServicioLlamadas instance = null;
public static boolean isRunning() {
return instance != null;
}
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
Toast.makeText(getApplicationContext(), "Servicio TRUCKA creado",
Toast.LENGTH_SHORT).show();
instance = this;
}
@Override
public void onDestroy() {
Toast.makeText(getApplicationContext(), "Servicio TRUCKA destruído",
Toast.LENGTH_SHORT).show();
instance = null;
}
@Override
public void onStart(Intent intent, int startid) {
Toast.makeText(getApplicationContext(), "Servicio TRUCKA iniciado",
Toast.LENGTH_SHORT).show();
TelephonyManager TelephonyMgr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
TelephonyMgr.listen(new TeleListener(),
PhoneStateListener.LISTEN_CALL_STATE);
}
class TeleListener extends PhoneStateListener {
@Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
switch (state) {
case TelephonyManager.CALL_STATE_IDLE:
if (estadoLlamada == "OFFHOOK") {
insercion = null;
getCallDetails();
Toast.makeText(getApplicationContext(),
"Información enviada.", Toast.LENGTH_SHORT).show();
}
estadoLlamada = "IDLE";
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
estadoLlamada = "OFFHOOK";
Toast.makeText(getApplicationContext(),
"Enviando información...", Toast.LENGTH_SHORT).show();
break;
case TelephonyManager.CALL_STATE_RINGING:
break;
default:
break;
}
}
}
//Obtener la fecha actual del teléfono.
public long getTodayTimestamp() {
Calendar c1 = Calendar.getInstance();
c1.setTime(new Date());
Calendar c2 = Calendar.getInstance();
c2.set(Calendar.YEAR, c1.get(Calendar.YEAR));
c2.set(Calendar.MONTH, c1.get(Calendar.MONTH));
c2.set(Calendar.DAY_OF_MONTH, c1.get(Calendar.DAY_OF_MONTH));
c2.set(Calendar.HOUR_OF_DAY, 0);
c2.set(Calendar.MINUTE, 0);
c2.set(Calendar.SECOND, 0);
return c2.getTimeInMillis();
}
private void getCallDetails() {
String timestamp = String.valueOf(getTodayTimestamp());
StringBuffer sb = new StringBuffer();
Cursor managedCursor = getContentResolver().query(CallLog.Calls.CONTENT_URI, null,
CallLog.Calls.DATE + ">= ?", new String[] { timestamp }, null);
int number = managedCursor.getColumnIndex(CallLog.Calls.NUMBER);
int type = managedCursor.getColumnIndex(CallLog.Calls.TYPE);
int date = managedCursor.getColumnIndex(CallLog.Calls.DATE);
int duration = managedCursor.getColumnIndex(CallLog.Calls.DURATION);
sb.append("Bitácora de llamadas :");
//managedCursor.moveToFirst();
managedCursor.moveToLast();
phNumber = managedCursor.getString(number);
callType = managedCursor.getString(type);
callDate = managedCursor.getString(date);
shortFecha = DateFormat.getDateInstance(DateFormat.SHORT);
shortDF = DateFormat.getTimeInstance(DateFormat.SHORT);
callDayTime = new Date(Long.valueOf(callDate));
fechaLlamada1 = shortDF.format(callDayTime);
fechaLlamada2 = shortFecha.format(callDayTime);
callDuration = managedCursor.getString(duration);
int dircode = Integer.parseInt(callType);
TelephonyManager mngr = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
switch (dircode) {
case CallLog.Calls.OUTGOING_TYPE:
dir = "Saliente";
break;
case CallLog.Calls.INCOMING_TYPE:
dir = "Entrante";
break;
case CallLog.Calls.MISSED_TYPE:
dir = "Perdida";
break;
}
imei = mngr.getDeviceId();
comentario = dir;
fechaRegistro = fechaLlamada2;
DateFormat df = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss");
String ahorita = df.format(callDayTime);
fechaInicio = ahorita.toString();
insercion = "DECLARE @claveDriver INT, @nombreDriver VARCHAR(max), @evento VARCHAR(max), @duracion int, @inicial varchar(max) "
+ "SET @claveDriver = (SELECT cve_tra FROM SISTEMA.dbo.TELEFONOS WHERE IMEI_SIM = '"
+ mngr.getDeviceId()
+ "') "
+ "SET @nombreDriver = (SELECT nombre FROM SISTEMA.dbo.TELEFONOS WHERE IMEI_SIM = '"
+ mngr.getDeviceId()
+ "') "
+ "SET @duracion = "
+ managedCursor.getString(duration)
+ "SET @evento = '(LOG) Llamada "
+ dir
+ ". Duración ' + CONVERT(varchar, @duracion, 103) + ' segundos al número: "
+ managedCursor.getString(number)
+ "' "
+ " SET @inicial = '"
+ fechaInicio
+ "'"
+ "INSERT INTO bitacora.dbo.registroDellamadasOperadores (fechacreacion,fecha_fin,fecha_inicio,idMobil,Tractor,Nom_tra,Cve_tra,FechaRegistro,Evento) "
+ " VALUES('"
+ fechaInicio
+ "', DATEADD(SECOND,@duracion,@inicial),'"
+ fechaInicio
+ "','"
+ mngr.getDeviceId()
+ "','',@nombreDriver,@claveDriver,current_timestamp,@evento)";
try
{
AsyncCallWS tareaEnviarABD = new AsyncCallWS();
tareaEnviarABD.execute();
}catch(Exception e){
Toast.makeText(getApplicationContext(),
e.toString(), Toast.LENGTH_SHORT).show();
}
}
private class AsyncCallWS extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... params) {
Log.i(TAG, "doInBackground");
InsertarLlamada(insercion);
return null;
}
@Override
protected void onPostExecute(Void result) {
Log.i(TAG, "onPostExecute");
txtInformacion.setText("Información enviada");
}
@Override
protected void onPreExecute() {
Log.i(TAG, "onPreExecute");
txtInformacion.setText("Enviando información...");
}
@Override
protected void onProgressUpdate(Void... values) {
Log.i(TAG, "onProgressUpdate");
}
}
public void InsertarLlamada(String insercion) {
// Creamos la solicitud
SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME);
// Propiedades que contienen los valores
PropertyInfo propiedades = new PropertyInfo();
propiedades.setName("insercion");
propiedades.setValue(insercion);
propiedades.setType(String.class);
// Agregamos las propiedades
request.addProperty(propiedades);
// Creamos el envelope
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
SoapEnvelope.VER11);
envelope.dotNet = true;
// ponemos la salida SOAP
envelope.setOutputSoapObject(request);
// Creamos la llamada HTTP
HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
try {
// Invocamos el servicio
androidHttpTransport.call(SOAP_ACTION, envelope);
// Obtenemos la respuesta
Object response = envelope.getResponse();
// Asignamos el resultado de la consulta
resultado = response.toString();
} catch (Exception e) {
Toast.makeText(getApplicationContext(),
e.toString(), Toast.LENGTH_SHORT).show();
}
}
}
And the log cat shows this:
Code:
02-25 09:32:32.946: D/ActivityThread(8866): setTargetHeapUtilization:0.25
02-25 09:32:32.946: D/ActivityThread(8866): setTargetHeapIdealFree:8388608
02-25 09:32:32.946: D/ActivityThread(8866): setTargetHeapConcurrentStart:2097152
02-25 09:33:07.663: D/libEGL(8866): loaded /system/lib/egl/libEGL_adreno200.so
02-25 09:33:07.663: D/libEGL(8866): loaded /system/lib/egl/libGLESv1_CM_adreno200.so
02-25 09:33:07.663: D/libEGL(8866): loaded /system/lib/egl/libGLESv2_adreno200.so
02-25 09:33:07.683: I/Adreno200-EGLSUB(8866): <ConfigWindowMatch:2087>: Format RGBA_8888.
02-25 09:33:07.693: E/(8866): <s3dReadConfigFile:75>: Can't open file for reading
02-25 09:33:07.693: E/(8866): <s3dReadConfigFile:75>: Can't open file for reading
02-25 09:33:07.693: D/OpenGLRenderer(8866): Enabling debug mode 0
02-25 09:33:13.128: I/TRUCKA_DRIVERS(8866): onPreExecute
02-25 09:33:13.128: D/AndroidRuntime(8866): Shutting down VM
02-25 09:33:13.128: W/dalvikvm(8866): threadid=1: thread exiting with uncaught exception (group=0x41e48438)
02-25 09:33:13.128: E/AndroidRuntime(8866): FATAL EXCEPTION: main
02-25 09:33:13.128: E/AndroidRuntime(8866): java.lang.NullPointerException
02-25 09:33:13.128: E/AndroidRuntime(8866): at com.trucka.llamadasdrivers.ServicioLlamadas$AsyncCallWS.onPreExecute(ServicioLlamadas.java:239)
02-25 09:33:13.128: E/AndroidRuntime(8866): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
02-25 09:33:13.128: E/AndroidRuntime(8866): at android.os.AsyncTask.execute(AsyncTask.java:534)
02-25 09:33:13.128: E/AndroidRuntime(8866): at com.trucka.llamadasdrivers.ServicioLlamadas.getCallDetails(ServicioLlamadas.java:215)
02-25 09:33:13.128: E/AndroidRuntime(8866): at com.trucka.llamadasdrivers.ServicioLlamadas.access$0(ServicioLlamadas.java:143)
02-25 09:33:13.128: E/AndroidRuntime(8866): at com.trucka.llamadasdrivers.ServicioLlamadas$TeleListener.onCallStateChanged(ServicioLlamadas.java:108)
02-25 09:33:13.128: E/AndroidRuntime(8866): at android.telephony.PhoneStateListener$2.handleMessage(PhoneStateListener.java:421)
02-25 09:33:13.128: E/AndroidRuntime(8866): at android.os.Handler.dispatchMessage(Handler.java:99)
02-25 09:33:13.128: E/AndroidRuntime(8866): at android.os.Looper.loop(Looper.java:137)
02-25 09:33:13.128: E/AndroidRuntime(8866): at android.app.ActivityThread.main(ActivityThread.java:5062)
02-25 09:33:13.128: E/AndroidRuntime(8866): at java.lang.reflect.Method.invokeNative(Native Method)
02-25 09:33:13.128: E/AndroidRuntime(8866): at java.lang.reflect.Method.invoke(Method.java:511)
02-25 09:33:13.128: E/AndroidRuntime(8866): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
02-25 09:33:13.128: E/AndroidRuntime(8866): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
02-25 09:33:13.128: E/AndroidRuntime(8866): at dalvik.system.NativeStart.main(Native Method)
02-25 09:33:14.240: I/Process(8866): Sending signal. PID: 8866 SIG: 9
Can someone please tell me what am I doing wrong?
Thanks!

FedePrado said:
Hello everyone, me again.
Code:
@Override
protected void onPreExecute() {
Log.i(TAG, "onPreExecute");
txtInformacion.setText("Enviando información...");
}
02-25 09:33:13.128: E/AndroidRuntime(8866): java.lang.NullPointerException
02-25 09:33:13.128: E/AndroidRuntime(8866): at com.trucka.llamadasdrivers.ServicioLlamadas$AsyncCallWS.onPreExecute(ServicioLlamadas.java:239)
Click to expand...
Click to collapse
it tells you there, note that on line 239 you are asking an object (in this case "txtInfromacion") to execute one of it's methods, but the object is actually "null" so it throws the exception
disclaimer, I only looked at it for 10 seconds cause busy but I would think there is a 99.5% chance I'm correct
EDIT : ok looked at it another 5 seconds, you never assign anything to that TextView, like associating it with the view on screen ? eg. findViewById(R.id.someID)

[Q] what the correct way to use ShowcaseView?

when I try to use ShowcaseView I get error
Code:
@override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
final ImageButton saveButton = (ImageButton) view.findViewById(R.id.button_Save);
ViewTarget viewTarget = new ViewTarget(saveButton);
showcaseView = new ShowcaseView.Builder(getActivity())
.setTarget(viewTarget)
.setContentTitle("Reset Button")
.setContentText("This will erase all the data in the table except the line that in progress")
.build();
}
when I tried to do the same thing in my fragmentactivity and didn't work, but when I did the same thing but took a view that declared in the fragmentactivity and not in the fragment it worked.
Logcat:
Code:
FATAL EXCEPTION: main
java.lang.IllegalArgumentException: width and height must be > 0
at android.graphics.Bitmap.createBitmap(Bitmap.java:724)
at android.graphics.Bitmap.createBitmap(Bitmap.java:703)
at android.graphics.Bitmap.createBitmap(Bitmap.java:670)
at com.github.amlcurran.showcaseview.ShowcaseView.updateBitmap(ShowcaseView.java:169)
at com.github.amlcurran.showcaseview.ShowcaseView.onGlobalLayout(ShowcaseView.java:343)
at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:839)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2050)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1249)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6364)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:791)
at android.view.Choreographer.doCallbacks(Choreographer.java:591)
at android.view.Choreographer.doFrame(Choreographer.java:561)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:777)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5419)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
at dalvik.system.NativeStart.main(Native Method)
I understand what the error said but how can I fix it?