Database Users

[Q] Need help with discount calculator

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

[Q] Choose a string in spinner

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!

[Q] How to achieve this Custom layout

I have tried the frame layout and sliderView all seemed abortive..
my aim is to slide a layout from below when a button is clicked and the layout shouldn't cover the whole screen just the height should wrap_content some thing like the image below
i am a newbie in android development so don't blame my ignorance thnak you as you help

no reply? please guys help a noob...

mashnino said:
no reply? please guys help a noob...
Click to expand...
Click to collapse
question is a little ambiguous and it's just a viewGroup afterall, there are 100's of implementation options. Personally I would use a fragmentDialog, but I could just as easy use any normal viewGroup.

deanwray said:
question is a little ambiguous and it's just a viewGroup afterall, there are 100's of implementation options. Personally I would use a fragmentDialog, but I could just as easy use any normal viewGroup.
Click to expand...
Click to collapse
okay dat was a little out of my league..can u like give me an example...
because this is what i have already... a layout within a layout and then some button in which onClick() it slides the layout from below.
the main problem is the layout doesnt stick to the bottom of the screen.. instead it slides to the top of the screen.
activity_main.xml
PHP:
<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:background="@color/blue"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#eeeeee"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/action_bar"
android:layout_width="fill_parent"
android:layout_height="60dp"
android:background="@color/blue" >
<ImageButton
android:id="@+id/qpaper_menu"
android:layout_width="60dp"
android:layout_height="60dp"
android:background="@drawable/menu_button_blue" />
<TextView
android:id="@+id/app_header_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/qpaper_menu"
android:text="UMAR MASH"
android:textColor="#fff"
android:textSize="18sp" />
</RelativeLayout>
<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="200dp"
android:layout_margin="12dp"
android:background="@drawable/bg_card"
android:orientation="vertical" >
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Umar mash was ere...."
android:layout_alignParentLeft="true"/>
<Button
android:id="@+id/slider"
android:layout_below="@id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sleider"
android:onClick="slider"/>
</RelativeLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/hidden_panel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:visibility="gone"
android:background="#000000" >
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Test" />
</LinearLayout>
</RelativeLayout>
and then the main_activity.java class
PHP:
package com.example.kkn;
import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageButton;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener{
ActionBar ab;
ImageButton side;
boolean isPanelDown;
View hiddenpanel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
side = (ImageButton) findViewById(R.id.qpaper_menu);
hiddenpanel = findViewById(R.id.hidden_panel);
ab = getActionBar();
ab.hide();
side.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.qpaper_menu:
Toast.makeText(getApplicationContext(), "This is the menu button", Toast.LENGTH_SHORT).show();
break;
default:
break;
}
}
public void slider(final View view) {
if (!isPanelShown()) {
// Show the panel
Animation bottomUp = AnimationUtils.loadAnimation(this,R.anim.bottom_up);
hiddenpanel.startAnimation(bottomUp);
hiddenpanel.setVisibility(View.VISIBLE);
}
else {
// Hide the Panel
Animation bottomDown = AnimationUtils.loadAnimation(this,R.anim.bottom_down);
hiddenpanel.startAnimation(bottomDown);
hiddenpanel.setVisibility(View.GONE);
}
}
private boolean isPanelShown() {
return hiddenpanel.getVisibility() == View.VISIBLE;
}
}
so any help please

mashnino said:
okay dat was a little out of my league..can u like give me an example...
so any help please
Click to expand...
Click to collapse
There are many examples of view animation both on the developer website and on SO. Sounds like you just need to set animate Y position to move relative ((screen height - (screen height - height of sliding view)) ?
Or just end at absolute (screen height - height of sliding view)

deanwray said:
There are many examples of view animation both on the developer website and on SO. Sounds like you just need to set animate Y position to move relative ((screen height - (screen height - height of sliding view)) ?
Or just end at absolute (screen height - height of sliding view)
Click to expand...
Click to collapse
i would have known what to do if i actually understood where to put the code... please can you like fork the code so that i can have an idea of what you are saying and from there i can look up other resources... please

mashnino said:
i would have known what to do if i actually understood where to put the code... please can you like fork the code so that i can have an idea of what you are saying and from there i can look up other resources... please
Click to expand...
Click to collapse
sounds like your wanting someone to write it for you ?
If not then you should just look at doing what I said, getting the height and working out the end position for the anim and setting it programmatically. If you need hints ask away but not sure I have the time to write it for you atm...sorry

[Q] Help needed display fragment with listadapter properly...

Hi guys, I am new to android development and I'm having a little trouble working with a list in fragment.
This is what I'm trying to achieve:
------------------
frag 1
------------------
frag 2 <-- list is here
-----------------
frag 3
-----------------
The list displays 3 strings in one row. This is my fragment code: ( the CustomListViewAdapter is implemented in another file called CustomListViewAdapter.java)
Code:
public class ListActivity extends Fragment{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FragmentManager fm = getFragmentManager();
if (fm.findFragmentById(android.R.id.content) == null) {
DataListFragment list = new DataListFragment();
fm.beginTransaction().add(android.R.id.content, list).commit();
}
}
public static class DataListFragment extends ListFragment implements
LoaderManager.LoaderCallbacks<List<Model>> {
CustomListViewAdapter mAdapter;
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
System.out.println("DataListFragment.onActivityCreated");
// Initially there is no data
setEmptyText("No Data Here");
// Create an empty adapter we will use to display the loaded data.
mAdapter = new CustomListViewAdapter(getActivity());
setListAdapter(mAdapter);
// Start out with a progress indicator.
setListShown(false);
}
@Override
public Loader<List<Model>> onCreateLoader(int arg0, Bundle arg1) {
return new DataListLoader(getActivity());
}
}
public static class DataListLoader extends AsyncTaskLoader<List<Model>> {
List<Model> mModels;
public DataListLoader(Context context) {
super(context);
}
@Override
public List<Model> loadInBackground() {
System.out.println("DataListLoader.loadInBackground");
List<Model> entries = new ArrayList<Model>(5);
entries.add(new Model("1", "a","3:48"));
entries.add(new Model("2", "b","4:02"));
entries.add(new Model("3", "c","3:48"));
entries.add(new Model("4", "d","3:52"));
entries.add(new Model("5", "e","3:44"));
return entries;
}
@Override public void deliverResult(List<Model> listOfData) {
...
}
@Override protected void onStartLoading() {
...
}
protected void onReleaseResources(List<Model> apps) {}
}
The 3 fragments are added programmatically in the main activity. MainActivity.java
The problem I am facing is that once the code runs, this fragment 2 overlaps the fragment 1 (both are still visible) that was supposed to be above it. How do I resolve this issue? Please help me figure this out! I believe I'm doing something wrong while adding this fragment.
This is the mainactivity.java
Code:
public class MainActivity extends Activity{
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.add(R.id.info_fragment, new InfoActivity());//frag 1
fragmentTransaction.add(R.id.list_fragment, new listActivity()); // frag 2
fragmentTransaction.add(R.id.controls_fragment, new ControlsActivity()); //frag 3
fragmentTransaction.commit();
}
}

code_name said:
Hi guys, I am new to android development and I'm having a little trouble working with a list in fragment.
Click to expand...
Click to collapse
The layout and views along with the layoutParams control how it looks, the fragments just nest inside the views, that you reference with your resource idents, so however it looks is probably based of the layout or layout parameters that are set in the xml layout

deanwray said:
The layout and views along with the layoutParams control how it looks, the fragments just nest inside the views, that you reference with your resource idents, so however it looks is probably based of the layout or layout parameters that are set in the xml layout
Click to expand...
Click to collapse
I doubt there is any problem with the xml layout. Here is the main layout file:
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http//schemas.android.com/apk/res/android"
android:id="@+id/linlayname"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/info_fragment"
android:layout_weight="3"
android:layout_width="match_parent"
android:layout_height="0dp" >
</FrameLayout>
<FrameLayout
android:id="@+id/list_fragment"
android:layout_weight="4"
android:layout_width="match_parent"
android:layout_height="0dp" >
</FrameLayout>
<FrameLayout
android:id="@+id/controls_fragment"
android:layout_weight="2"
android:layout_width="match_parent"
android:layout_height="0dp" >
</FrameLayout>
</LinearLayout>
And this is the list 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" >
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>

code_name said:
I doubt there is any problem with the xml layout. Here is the main layout file:
Click to expand...
Click to collapse
Are you sure you are using android:layout_weight properly ?
It would first occur to me that not all the views (3 that contain the fragments) should/would be variable ... but it suggests they are ? weight is of the unused remainder space, so I would maybe suggest a weight of 0,1,0 meaning the 1st and last you set to wrap_content and they are variable based on content... the middle using a weight of 1 uses any space remaining
so
Code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http//schemas.android.com/apk/res/android"
android:id="@+id/linlayname"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<FrameLayout
android:id="@+id/info_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</FrameLayout>
<FrameLayout
android:id="@+id/list_fragment"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="0dp" >
</FrameLayout>
<FrameLayout
android:id="@+id/controls_fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</FrameLayout>
</LinearLayout>

deanwray said:
Are you sure you are using android:layout_weight properly ?
It would first occur to me that not all the views (3 that contain the fragments) should/would be variable ... but it suggests they are ? weight is of the unused remainder space, so I would maybe suggest a weight of 0,1,0 meaning the 1st and last you set to wrap_content and they are variable based on content... the middle using a weight of 1 uses any space remaining
so...
Click to expand...
Click to collapse
Yes that is the way I want it laid out, it looks better now, but the main problem still remains. The listActivity (the middle fragment) starts from the top of the screen and overlaps the first fragment (first one is visible under the list).I think I am adding the fragment at the wrong place?

code_name said:
Yes that is the way I want it laid out, it looks better now, but the main problem still remains. The listActivity (the middle fragment) starts from the top of the screen and overlaps the first fragment (first one is visible under the list).I think I am adding the fragment at the wrong place?
Click to expand...
Click to collapse
BTW I think I have flu atm (or a man cold, either way it would kill a woman) so double check whatever I say
Erm, not sure what your doing with ListActivity onCreate() your doing fragment transactions in there ? But will it not always be null when loading anything ? onCreateView() is where it would return the new view to the fragmentManager for attaching... so when it does the transaction in ListActivity your also using android.R.id.content which is a base id for the area that an app runs in (also happens to be a frameLayout) which is what you problem is... personally I would think and design out of this problem a little different ... if you want a chat hit me up on hangouts, happy to help!

[Tutorial] Learn how to create a Blink Effect on Android

Hello,
I create that thread to offer you a tutorial aiming to learn you how to create a Blink Effect on Android. Like usual, you can also enjoy this tutorial in video on Youtube :
Create a Blink Effect on Android
Like you must know, users always enjoy cool effects on interfaces. Adding some effects on your Android application can be a good way to make your application different from others. Previously, we have seen how to create a type writer effect and a blur effect. In this tutorial, you are going to learn how to create a blink effect on Android. It will be also a good way to discover how to use Animations.
First, we create a layout with a TextView that will receive the blink effect and a Button to start the blink effect :
Code:
<?xml version="1.0" encoding="utf-8"?>
<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="com.ssaurel.blinkeffect.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Blink Effect with SSaurel "
android:textSize="22sp"
android:layout_centerInParent="true"
android:id="@+id/txt"
/>
<Button
android:text="Blink Effect !"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn"
android:layout_below="@id/txt"
android:layout_marginTop="50dp"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
Now, it's time to write the code for the blink effect in an Activity. To make a blink effect, we can use the ObjectAnimator object of Android SDK that lets us to animate a specific property of a View. Here, we need to animate the backgroundColor property of the TextView. In the ObjectAnimator, we can also define colors we want to apply to the background, duration of the animation, evaluator, repeat mode and repeat count. Here, we create an infinite animation. The code of the blink effect animation should be like that :
Code:
ObjectAnimator anim = ObjectAnimator.ofInt(txt, "backgroundColor", Color.WHITE, Color.RED,
Color.WHITE);
anim.setDuration(1500);
anim.setEvaluator(new ArgbEvaluator());
anim.setRepeatMode(Animation.REVERSE);
anim.setRepeatCount(Animation.INFINITE);
anim.start();
The complete code for the Activity is the following :
Code:
package com.ssaurel.blinkeffect;
import android.animation.ArgbEvaluator;
import android.animation.ObjectAnimator;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.animation.Animation;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView txt;
private Button blinkBtn;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txt = (TextView) findViewById(R.id.txt);
blinkBtn = (Button) findViewById(R.id.btn);
blinkBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
manageBlinkEffect();
}
});
}
private void manageBlinkEffect() {
ObjectAnimator anim = ObjectAnimator.ofInt(txt, "backgroundColor", Color.WHITE, Color.RED,
Color.WHITE);
anim.setDuration(1500);
anim.setEvaluator(new ArgbEvaluator());
anim.setRepeatMode(Animation.REVERSE);
anim.setRepeatCount(Animation.INFINITE);
anim.start();
}
}
Finally, you can launch the application and enjoy your cool blink effect .
Don't hesitate to give it a try and give me your feedbacks.
Thanks.
Sylvain

Some feedbacks ?