I am a newbie in android dev.
I want to develop a very small and simple discount rate calculator.
in which there will be drop down menu with options like:
calculate 10%
calculate 20%
calculate 30%
Based on the selection of option from the drop down menu the discount rate should change.
After selection, there will be a textbox which should ask user to enter price.
and on the click even of "Calculate" button, the resultant amount (discounted rate) should be displayed.
I guess it is very simple for you guys. If anyone can help me with the code, i will deeply appreciate.
thank you
ok this is what I have done till now:
I created an Android Project names as :MyDC
MyDC.java
Code:
package com.super.mydc;
import android.app.Activity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Button;
import android.view.View;
public class MyDC extends Activity {
private EditText amount1;
private double x=0;
private double y=2.0;
private double z=0;
private TextView tt;
private Button calculate;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
// We want to view some very simple text, so we need a TextView
TextView tv = new TextView(this);
// Put some text to the newly created TextVIew
tv.setText("Test");
// Tell our Application to display the textView
this.setContentView(tv);
super.onCreate(icicle);
setContentView(R.layout.main);
initControls();
}
private void initControls()
{
amount1=(EditText)findViewById(R.id.amount1);
tt=(TextView)findViewById(R.id.tt);
calculate=(Button)findViewById(R.id.calculate);
calculate.setOnClickListener(new Button.OnClickListener()
{public void onClick
(View v) { calculate();}});
}
private void calculate()
{
x=Double.parseDouble(amount1.getText().toString());
z=x-(x*y/100);
tt.setText(Double.toString(z));
}
}
This is main.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/spinner1"></Spinner>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Enter the price"
/>
<EditText android:layout_height="wrap_content" android:id="@+id/amount1" android:text="" android:layout_width="match_parent"></EditText>
<Button android:text="Calculate Result" android:id="@+id/calculate" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<EditText android:layout_height="wrap_content" android:id="@+id/tt" android:text="" android:layout_width="match_parent"></EditText>
</LinearLayout>
This is string.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hi, MyDC!</string>
<string name="app_name">My, DC</string>
<string name="spinner1">Choose discount type</string>
</resources>
This is what I am able to get:
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
I am able to calculate discount on the button click, BUT i have hardcoded the discount rate.
I want to select discount rate based on the dropdown menu (I don't know how to set dropdown values with different discount rate in this problem)
In the dropdown menu I would like to have values like this:
Type 1 discount
Type 2 discount
Type 3 discount
Here is the respective discount rate for the above drop-down values:
Type 1 discount - 10%
Type 2 discount - 15%
Type 3 discount - 18%
PLZ HELP ME
Ok somehow I was able to add spinner tool on my application.
Now the question is how to select discount rate based on selected value from spinner.
PLZ HELP ME WITH THE CODE
Here is my current code:
MyDC.java
Code:
package com.super.mydc;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Button;
import android.view.View;
public class MyDC extends Activity {
private EditText amount1;
private double x=0;
private double y=2.0;
private double z=0;
private TextView tt;
private Button calculate;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
// We want to view some very simple text, so we need a TextView
TextView tv = new TextView(this);
// Put some text to the newly created TextVIew
tv.setText("Test");
// Tell our Application to display the textView
this.setContentView(tv);
super.onCreate(icicle);
setContentView(R.layout.main);
Spinner spinner = (Spinner) findViewById(R.id.spinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.planets_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
initControls();
}
private void initControls()
{
amount1=(EditText)findViewById(R.id.amount1);
tt=(TextView)findViewById(R.id.tt);
calculate=(Button)findViewById(R.id.calculate);
calculate.setOnClickListener(new Button.OnClickListener()
{public void onClick
(View v) { calculate();}});
}
private void calculate()
{
x=Double.parseDouble(amount1.getText().toString());
z=x-(x*y/100);
tt.setText(Double.toString(z));
}
}
main.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Spinner android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/spinner1"></Spinner>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:text="@string/planet_prompt"
/>
<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="@string/planet_prompt"
/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Enter the price"
/>
<EditText android:layout_height="wrap_content" android:id="@+id/amount1" android:text="" android:layout_width="match_parent"></EditText>
<Button android:text="Calculate Result" android:id="@+id/calculate" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
<EditText android:layout_height="wrap_content" android:id="@+id/tt" android:text="" android:layout_width="match_parent"></EditText>
</LinearLayout>
strings.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hi, MyDC!</string>
<string name="app_name">My, DC</string>
<string name="spinner1">Choose a planet</string>
<string name="planet_prompt">Choose a planet</string>
<string-array name="planets_array">
<item>10% discount A</item>
<item>15% discount B</item>
<item>18% discount C</item>
</string-array>
</resources>
Anyone ? Please Help ?
Im sorry to not be of very much help I studied java as a highschool unfortunately it was senior year and I am good at slacking. I would like to add suggestions though. first off i would try to find someway of implementing a way to get closer increments such as 5 or 1 %. such as a text box. let me sift through your code and see what i can see. are you having specific errors or what. we need some info.
Ok i looked at your code and im having a hard time reading it just because it isnt the norm that I look at. first off ya need to name your variables more recognizable things then x and y. that will make coding immensely more easy. also I am not seeing where you gathered the information from the drop down or spinner. at some point in the code you have to collect the information from the drop down or spinner and use it for the percent. also i didn't see any point where you gave the drop down any values. if you have any questions or anything feel free to pm I have xda app on my phone so even if not im not online ill get a notification on my phone.
{SBR}_L3GION said:
Ok i looked at your code and im having a hard time reading it just because it isnt the norm that I look at. first off ya need to name your variables more recognizable things then x and y. that will make coding immensely more easy. also I am not seeing where you gathered the information from the drop down or spinner. at some point in the code you have to collect the information from the drop down or spinner and use it for the percent. also i didn't see any point where you gave the drop down any values. if you have any questions or anything feel free to pm I have xda app on my phone so even if not im not online ill get a notification on my phone.
Click to expand...
Click to collapse
Hi,
Yes, I know I haven't defined values to drop down because that is the thing I need help with.
I also posted above this:
"Now the question is how to select discount rate based on selected value from spinner.
PLZ HELP ME WITH THE CODE"
I need help - How to define discount rate based on selection of drop down values.
Please help me with the code....
I also tried doing this quite awhile with an app I was writing and then discovered I had not enough experience to with the android system to write the program I should look it up and fix both of our programs but I've had a migraine for days and I'm just getting close to sleeping but when I get a chance I will look up giving values to the drop down and collecting them unless you want to google it first.
Sent from my Synergized xda Premium Evo
I have tried to find the solution on google but didn't get anything but somehow from google I was able to do (whatever I did above)
thanks, I think that would be great, if you can test my program on your side by that we both will be on the same page.
That's fine, you can test it whenever you get some time.
I appreciate your help!
I would setup radio buttons for the discount percentages
0 10% 0 20% etc.
Name each radio button and use a case statement to set a float to it's value:
switch(radioGroupName) {
case 10Percent:
int discountValue = .10
break;
...
Then do something like:
int discountedAmount = usersAmount - (usersAmount * discountValue);
Try this code.
myDC.java
Code:
package com.mydc;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.TextView;
import android.widget.Toast;
public class myDC extends Activity {
double initial_price;
double discount;
double final_price;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.discount, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
if (pos==0){
discount=10;
}
else if (pos==1){
discount=15;
}
else if (pos==2){
discount=18;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
Button calculate = (Button) findViewById(R.id.calculate);
calculate.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
EditText amount1 = (EditText) findViewById(R.id.amount1);
if (amount1.length()>0 ) {
initial_price=Double.parseDouble(amount1.getText().toString());
TextView final_price_text = (TextView) findViewById(R.id.final_price);
final_price=initial_price-(initial_price*discount/100);
final_price_text.setText("Final Price : "+final_price);
}
else {
Toast.makeText(getBaseContext(), "Please enter price", Toast.LENGTH_SHORT).show();
}
}
});
}
}
main.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/spinner1"></Spinner>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Enter the price" />
<EditText
android:layout_height="wrap_content"
android:id="@+id/amount1"
android:text=""
android:layout_width="match_parent"
android:numeric="decimal"></EditText>
<Button
android:text="Calculate Result"
android:id="@+id/calculate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
<TextView
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_width="fill_parent"
android:id="@+id/final_price"></TextView>
</LinearLayout>
strings.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, main!</string>
<string name="app_name">myDC</string>
<string-array name="discount">
<item>10% discount A</item>
<item>15% discount B</item>
<item>18% discount C</item>
</string-array>
</resources>
Re: Need Help
Hello nemoc 23 ,
Firstly thank you very much for replying back with a solution.
It did work and solved my problem upto some extend.
Now what I only want 2 things to be done:
1) Right now, if we enter price in decimal or anything, if the final result is in decimal, it is being displayed as EXACT something like 99.9999999
How to limit the RESULT upto 2 decimal points only ?
2) What I am trying to do is to have this calculator on 3 different pages (in each page I will just modify the discounted rate). So I want a homepage (which will work as MENU) with 3 or 4 buttons and each button should be connected with specific page that will have ITS OWN above discount calculator.
Could you please show me how to create a homepage screen (which will work as MENU) and 3 or 4 buttons on it which are linked with different pages (in each page you can copy the same above calculator and I will modify the rate by myself)
thank you
Why 3 pages? Just do this:
Enter discount amount: ___________
Enter discount rate:______
Discounted Amount: ___________
Easy peasy.
Rootstonian said:
Why 3 pages? Just do this:
Enter discount amount: ___________
Enter discount rate:______
Discounted Amount: ___________
Easy peasy.
Click to expand...
Click to collapse
I know it is easy but it is not what I am looking for. My requirement is what I posted above. Thanks
Help
Hello nemoc 23 ,
Just giving you an update. I did try the tutorial you asked me to try. I am having some problem in it which you can see here: http://forum.xda-developers.com/showthread.php?p=15612542
Coming back my question (this calculator topic) - I created a screen layout to give you an idea what I want to do and need your help with.
This is what I want to do:
In this each button click will open separate page (or I guess it is called activity). I have mentioned on button what each button will open.
Please help me. thanks
Intent i = new Intent(this, calculator1.class);
startActivity(i);
You are still better off creating just ONE new Activity and passing to it which calculator you want to run. It is poor programming to code 3 activities when one will suffice. You'll need "extras" to do this.
Need Help
Ok somehow I was able to code for this problem but I am not getting desired output.
I have 3 buttons on my welcome screen "calculator", "calculator2", "exit" - My buttons are not working, I don't know why.
**Below is my complete code / programs:**
**welcome.java**
Code:
package com.testcalculator;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class welcome extends Activity implements OnClickListener
{
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome1);
//////// MENU //////////
Button playBtn = (Button) findViewById(R.id.playBtn);
playBtn.setOnClickListener(this);
Button playBtn2 = (Button) findViewById(R.id.playBtn);
playBtn2.setOnClickListener(this);
Button exitBtn = (Button) findViewById(R.id.exitBtn);
exitBtn.setOnClickListener(this);
}
/**
* Listener for game menu
*/
public void onClick(View v) {
Intent i;
switch (v.getId()){
case R.id.playBtn :
i = new Intent(this, testcalculator.class);
startActivity(i);
break;
case R.id.playBtn2 :
i = new Intent(this, testcalculator2.class);
startActivity(i);
break;
case R.id.exitBtn :
finish();
break;
}
}
}
**welcome1.xml**
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Button
android:id ="@+id/playBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Calculator"
/>
<Button
android:id ="@+id/playBtn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Calculator2"
/>
<Button
android:id ="@+id/exitBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Exit"
/>
</LinearLayout>
**testcalculator.java**
Code:
package com.testcalculator;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.TextView;
import android.widget.Toast;
public class testcalculator extends Activity {
double initial_price;
double discount;
double final_price;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner) findViewById(R.id.spinner1);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.discount, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
if (pos==0){
discount=10;
}
else if (pos==1){
discount=15;
}
else if (pos==2){
discount=18;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
Button calculate = (Button) findViewById(R.id.calculate);
calculate.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
EditText amount1 = (EditText) findViewById(R.id.amount1);
if (amount1.length()>0 ) {
initial_price=Double.parseDouble(amount1.getText().toString());
TextView final_price_text = (TextView) findViewById(R.id.final_price);
final_price=initial_price-(initial_price*discount/100);
final_price_text.setText("Final Price : "+final_price);
}
else {
Toast.makeText(getBaseContext(), "Please enter price", Toast.LENGTH_SHORT).show();
}
}
});
}
}
**testcalculator.xml**
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/spinner1"></Spinner>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Enter the price" />
<EditText
android:layout_height="wrap_content"
android:id="@+id/amount1"
android:text=""
android:layout_width="match_parent"
android:numeric="decimal"></EditText>
<Button
android:text="Calculate Result"
android:id="@+id/calculate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
<TextView
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_width="fill_parent"
android:id="@+id/final_price"></TextView>
</LinearLayout>
**testcalculator2.java**
Code:
package com.testcalculator;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.TextView;
import android.widget.Toast;
public class testcalculator2 extends Activity {
double initial_price;
double discount2;
double final_price2;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Spinner spinner = (Spinner) findViewById(R.id.spinner2);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.discount2, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
if (pos==0){
discount2=20;
}
else if (pos==1){
discount2=25;
}
else if (pos==2){
discount2=28;
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
Button calculate2 = (Button) findViewById(R.id.calculate2);
calculate2.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
EditText amount2 = (EditText) findViewById(R.id.amount2);
if (amount2.length()>0 ) {
initial_price=Double.parseDouble(amount2.getText().toString());
TextView final_price_text = (TextView) findViewById(R.id.final_price2);
final_price2=initial_price-(initial_price*discount2/100);
final_price_text.setText("Final Price : "+final_price2);
}
else {
Toast.makeText(getBaseContext(), "Please enter price", Toast.LENGTH_SHORT).show();
}
}
});
}
}
**testcalculator2.xml**
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<Spinner
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/spinner2"></Spinner>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Enter the price" />
<EditText
android:layout_height="wrap_content"
android:id="@+id/amount2"
android:text=""
android:layout_width="match_parent"
android:numeric="decimal"></EditText>
<Button
android:text="Calculate Result"
android:id="@+id/calculate2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></Button>
<TextView
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_width="fill_parent"
android:id="@+id/final_price2"></TextView>
</LinearLayout>
**AndroidManifest.xml**
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.testcalculator"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".welcome"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".testcalculator" />
<activity android:name=".testcalculator2" />
</application>
</manifest>
**strings.xml**
Code:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, testcalculator!</string>
<string name="app_name">testcalculator</string>
<string-array name="discount">
<item>10% discount A</item>
<item>15% discount B</item>
<item>18% discount C</item>
</string-array>
<string-array name="discount2">
<item>20% discount A</item>
<item>25% discount B</item>
<item>28% discount C</item>
</string-array>
</resources>
**main.xml**
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello"
/>
</LinearLayout>
When I click Button1 "Calculator" - I get error saying ""The application testcalculator (process com.testcalculator) has stopped unexpectedly. Please try again.""
Button2 "Calculator2" doesn't do anything and same with 3rd button "exit:
**Please help me!!!**
You got a couple options. First instead of the startActivity() throw in a Toast so you can see if your onClick() is ok. You can also throw some inline clicklisteners (anonymous inner class) inside the setOnClickListener() instead of using 'this'. I find that way is a bit easier to organize.
Annd might I suggest you follow the Java guidelines for capitalisation of class names. Its confusing when reading your code and seeing testcalculator.class when usually instances of objects are lower case while the class name is capitalized. Like TestCalculator.class
From something awesome
Hey guys!
I am working on my first app, cut me some slack for asking please .
So I'm stuck on a little problem:
I have a reader activity and I put a spinner on top of the screen to choose the string where the text comes from:
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Spinner
android:id="@+id/kapitelspinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="@string/kapitel_prompt" />
<ScrollView android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/kapitel1"
/>
</ScrollView>
</LinearLayout>
The TextView in the ScrollView is supposed to be the selected text from the spinner.
Code:
package com.asm.reader;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class BookActivity extends Activity {
static final private int CHOOSE_KAPITEL = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.book_activity);
Spinner spinner = (Spinner) findViewById(R.id.kapitelspinner);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(
this, R.array.kapitel_array, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
}
}
Code:
package com.asm.reader;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Toast;
public class MyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> parent,
View view, int pos, long id) {
Toast.makeText(parent.getContext(),
parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
}
public void onNothingSelected(AdapterView parent) {
// Do nothing.
}
}
I'm trying to make the spinner choose the string of the textview but i have no idea how to do it. (Already did the toast part)
If anyone could help me it would be greatly appreciated!
Thanks !
bump. the last problem im stuck on
The way I understand what you're trying to do is select an item from the spinner, and set the TextView according to the selected spinner item.
If that is the case you will, for starters, need to set an id attribute for the TextView in the layout xml file.
Then within your onItemSelected() method you need to create a reference to the TextView the same way you did it with the spinner; using the findViewById() method.
Then using that reference you can set the text of the TextView using the same string you got when you created the Toast notification.
Hope that helps!
I am trying make factorial value calculator using for loop.but it shows wrong value when no. Greater than 15-16 are used.any solution?
My coding is somewhat like this
int f=1,i;
for(i=1;i
arpitkh96 said:
I am trying make factorial value calculator using for loop.but it shows wrong value when no. Greater than 15-16 are used.any solution?
My coding is somewhat like this
int f=1,i;
for(i=1;i
Click to expand...
Click to collapse
You would usually do this recursive, but with a for loop you can do it like this:
Code:
int value;
double result=1;
for(int i=1; i<=value; i++) {
result=result * i;
}
return result
But pay attention that the user cannot enter numbers bigger that 100 or so. 15-16 should work... If you use a double as result.
SimplicityApks said:
You would usually do this recursive, but with a for loop you can do it like this:
Code:
int value;
double result=1;
for(int i=1; i<=value; i++) {
result=result * i;
}
return result
But pay attention that the user cannot enter numbers bigger that 100 or so. 15-16 should work... If you use a double as result.
Click to expand...
Click to collapse
Ok will try
Sent from my GT-S5570 using xda premium
it worked thanks
One more problem
I am trying to implement tab layout but it fc"s
Code:
package com.example.arpit;
import android.app.TabActivity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
public class tivity extends TabActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources ressources = getResources();
TabHost tabHost = getTabHost();
Intent intentAndroid = new Intent().setClass(this, BMI.class);
TabSpec tabSpecAndroid = tabHost
.newTabSpec("Android")
.setContent(intentAndroid);
Intent intentApple = new Intent().setClass(this, BMI.class);
TabSpec tabSpecApple = tabHost
.newTabSpec("Apple")
.setContent(intentApple);
Intent intentWindows = new Intent().setClass(this, BMI.class);
TabSpec tabSpecWindows = tabHost
.newTabSpec("Windows")
.setContent(intentWindows);
Intent intentBerry = new Intent().setClass(this, BMI.class);
TabSpec tabSpecBerry = tabHost
.newTabSpec("Berry")
.setContent(intentBerry);
// add all tabs
tabHost.addTab(tabSpecAndroid);
tabHost.addTab(tabSpecApple);
tabHost.addTab(tabSpecWindows);
tabHost.addTab(tabSpecBerry);
//set Windows tab as default (zero based)
tabHost.setCurrentTab(2);
}
}
Sent from my GT-S5570 using xda premium
Main.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp">
<TabWidget
android:id="@android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp" />
</LinearLayout>
</TabHost>
I've tried to create simple dialer widget that will get contacts from contact book, put them into stackview and when clicked create a popup where you can call or create a message. I worked well as an application, but when I turned it into actual widget, I've encountered something weird. Despite all the methods firing, the items are not updated and stay on loading layout.
I've compared it to the example, tried to switch parts of code and nothing works. Even funnier, my code works perfectly when I put it in example widget, but example code doesn't work in mine. The same thing happens for listview and gridview. Is there any other file I should edit?
I provide the code, layouts and manifest. Logcat shows all methods firing in right order, so there's nothing to see there.
WidgetProvider.java
Code:
public class WidgetProvider extends AppWidgetProvider {
@Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager,
int[] appWidgetIds){
Log.d("WIDGET", "Called onUpdate()");
for (int i = 0; i < appWidgetIds.length; ++i){
// Set up the intent that starts the StackViewService, which will
// provide the views for this collection.
Intent intent = new Intent(context, WidgetService.class);
// Add the app widget ID to the intent extras.
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[i]);
intent.setData(Uri.parse(intent.toUri(Intent.URI_INTENT_SCHEME)));
// Instantiate the RemoteViews object for the app widget layout.
RemoteViews rv = new RemoteViews(context.getPackageName(), R.layout.main);
rv.setRemoteAdapter(R.id.stackView, intent);
rv.setEmptyView(R.id.stackView, R.id.emptyView);
appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
Log.d("WIDGET", "Widget updated");
}
super.onUpdate(context, appWidgetManager, appWidgetIds);
}
}
WidgetService.java
Code:
package com.chmis.superdialer;
import java.util.Collections;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.util.Log;
import android.widget.RemoteViews;
import android.widget.RemoteViewsService;
public class WidgetService extends RemoteViewsService {
@Override
public RemoteViewsFactory onGetViewFactory(Intent intent) {
return new StackRemoteViewsFactory(this.getApplicationContext(), intent);
}
}
class StackRemoteViewsFactory implements RemoteViewsService.RemoteViewsFactory {
Context context;
Intent intent;
public StackRemoteViewsFactory(Context applicationContext, Intent intent) {
this.context = applicationContext;
this.intent = intent;
}
@Override
public void onCreate() {
Log.d("SERVICE", "Called onCreate()");
//Get contact Cursor
Cursor contactCursor = context.getContentResolver().query(
ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
null, null, null, null);
//Get contacts from cursor, store them as Contact objects inside ArrayList
while (contactCursor.moveToNext()) {
String name = contactCursor.getString(contactCursor.getColumnIndex(
ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phone = contactCursor.getString(contactCursor.getColumnIndex(
ContactsContract.CommonDataKinds.Phone.NUMBER));
long id = contactCursor.getLong(contactCursor.getColumnIndex(
ContactsContract.CommonDataKinds.Phone.CONTACT_ID));
Contact.array.add(new Contact(name, phone, id));
}
//Sort contacts by name
Collections.sort(Contact.array, new ContactComparator(Contact.JOHN_SMITH));
}
@Override
public RemoteViews getViewAt(int position) {
Log.d("SERVICE", "Called getViewAt(" + position + ")");
RemoteViews rv = new RemoteViews(context.getPackageName(), R.layout.main);
rv.setTextViewText(R.id.contactNameTextView, Contact.array.get(position).getDefaultName());
// Return the remote views object.
return rv;
}
@Override
public int getCount() {
Log.d("SERVICE", "Called getCount(), returned " + Contact.array.size());
return Contact.array.size();
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public RemoteViews getLoadingView() {
return null;
}
@Override
public int getViewTypeCount() {
return 0;
}
@Override
public boolean hasStableIds() {
return true;
}
@Override
public void onDataSetChanged() {}
@Override
public void onDestroy() {
Contact.array.clear();
Log.d("SERVICE", "Called onDestroy()");
}
}
main.xml
Code:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<StackView
android:id="@+id/stackView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:loopViews="true" />
<TextView
android:id="@+id/emptyView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:background="@android:color/transparent"
android:textStyle="bold"
android:textColor="#ffffff"
android:text="@string/no_contacts" />
</FrameLayout>
contact_stack_item
Code:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/transparent_dark" >
<ImageView
android:id="@+id/contactPhotoImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:contentDescription="@string/contact_image_description"
android:src="@drawable/contact_photo_default" />
<TextView
android:id="@+id/contactNameTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/contactPhotoImageView"
android:layout_alignLeft="@+id/contactPhotoImageView"
android:layout_alignRight="@+id/contactPhotoImageView"
android:background="@color/transparent_dark"
android:gravity="center_horizontal"
android:text="@string/contact_name_placeholder"
android:textColor="@android:color/white" />
</RelativeLayout>
manifest
Code:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.chmis.superdialer"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application android:label="@string/app_name" >
<receiver android:name="WidgetProvider" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/app_widget_provider_info" />
</receiver>
<service
android:name="WidgetService"
android:exported="false"
android:permission="android.permission.BIND_REMOTEVIEWS" />
</application>
</manifest>
@edit I've copied the whole service code again and now it decided to work. I don't know anything anymore.
Hello I m newbie in Android development.
So i practiced with one sample which is sending ussd code to operator such as recharging bill. I am okay with that.
But my main problem is to show dialog box when clicking button1 after filling PIN code to examine the user correct or not.
I don't know how to add and what to add.
My codes are -
MainActivity.java
HTML:
package com.messagealert;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
[user=439709]@override[/user]
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener(){
public void onClick (View v){
EditText editText1 =(EditText) findViewById(R.id.editText1);
String pin = editText1.getText().toString();
String encodedHash = Uri.encode("#");
String ussd = "*" + "124" + pin + encodedHash;
Intent button1 = new Intent(android.content.Intent.ACTION_CALL, Uri.parse("tel:" + ussd));
startActivity(button1);
}
});
}
[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
HTML:
<RelativeLayout xmlns:android="h t t p://schemas. android. com/apk/res/android"
xmlns:tools="h t t p:// 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" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<EditText
android:id="@+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_marginTop="22dp"
android:layout_centerHorizontal="true"
android:ems="10"
android:inputType="number"
android:maxLength="6"
android:hint="Enter 6 numbers here"
>
<requestFocus />
</EditText>
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/editText1"
android:layout_marginTop="31dp"
android:layout_centerHorizontal="true"
android:text="@string/button1" />
</RelativeLayout>
Please guide what i need to put & where exactly to show a dialog box "Is that your PIN code - xxxxxx" & Yes or No
Sorry for my bad English.
With Best Regards,
You should use AlertBox. It is very easy to write it. Just google some tutorials about it
AlertDialog, my mistake