Animations in Android

How to apply animations for the objects in android??

This are few animation xml files which should be stored in res/anim folder.

alpha.xml

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<alpha 

android:fromAlpha="0" 

android:toAlpha="1.0"

android:fillAfter="true" 

android:duration="7000"

/>

</set>

rotate.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
    <rotate
    android:fromDegrees="0"
    android:toDegrees="-360"
    android:pivotX="50%"
    android:pivotY="50%"
    android:duration="7000"
    />
</set>

scale.xml

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<scale

android:pivotX="50%"

android:pivotY="50%"

android:fromXScale="1.0"

android:fromYScale="1.0"

android:toXScale="2.0"

android:toYScale="2.0"

android:duration="2500"

/>

</set>

spin.xml

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

  <rotate  

       android:fromDegrees="0"

       android:toDegrees="360" 

       android:duration="2000"

       android:pivotX="50%" 

       android:pivotY="50%" 

       android:repeatCount="infinite"

  />  

</set>

translate.xml

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<translate  

android:fromXDelta="110" 

android:toXDelta="-120" 

android:duration="4000" 

android:fillAfter="true"

  android:fromYDelta="190" 

  android:toYDelta="0"

/>

</set>

All the above xml files should be stored in res/anim folder

Next now in
MainActivity.java

package com.sri.animation;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ImageView;
import android.widget.Spinner;

public class MainActivity extends Activity implements OnItemSelectedListener {
Spinner sp;
ImageView i;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sp = (Spinner) findViewById(R.id.spinner1);
i = (ImageView) findViewById(R.id.imageView1);
sp.setOnItemSelectedListener(this);
}

@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
long item) {
// TODO Auto-generated method stub
if (item == 1) {
Animation a = AnimationUtils.loadAnimation(this, R.anim.alpha);
i.startAnimation(a);
}
if (item == 2) {
Animation a = AnimationUtils.loadAnimation(this, R.anim.rotate);
i.startAnimation(a);
}
if (item == 3) {
Animation a = AnimationUtils.loadAnimation(this, R.anim.scale);
i.startAnimation(a);
}
if (item == 4) {
Animation a = AnimationUtils.loadAnimation(this, R.anim.spin);
i.startAnimation(a);
}
if (item == 5) {
Animation a = AnimationUtils.loadAnimation(this, R.anim.translate);
i.startAnimation(a);
}

}

@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

}
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:entries="@array/Animation" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_marginTop="100dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:src="@drawable/facebook" />

</LinearLayout>

values/strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">Animation</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>

    <string-array name="Animation">
        <item>Select Item</item>
        <item>Alpha</item>
        <item>Rotate</item>
        <item>Scale</item>
        <item>Spin</item>
        <item>Translate</item>
    </string-array>

</resources>

Now run the application.

WebView in Android

Using a web view to load a page from Internet

WebView is nothing but the simple view created within the application so as to load the web pages within the application and not exit the application and load in the inbuilt browser.

1.MainActivity.java

package com.sri.webview;

import android.os.Bundle;

import android.webkit.WebView;

import android.app.Activity;

public class MainActivity extends Activity {

WebView wb;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

wb=(WebView) findViewById(R.id.webview);

wb.getSettings().setJavaScriptEnabled(true);

wb.loadUrl("http://www.google.co.in");

}

}

2.activity_main.xml

<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" >

    <WebView

        android:id="@+id/webview"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

</RelativeLayout>

3.Add permission in the android manifest file

<uses-permission android:name="android.permission.INTERNET"/>

4.That's it

Seek Bar with progress showing with two text views

Seek Bar with progress showing with two text views

In the previous Post i told you how to add the seek bar for media player. Now i'll tell you to add two text views to media player which shows the progress of the seek bar.

1.activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <SeekBar

        android:id="@+id/seekBar1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_margin="10dp" />

        <Button

        android:id="@+id/button2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_above="@+id/seekBar1"

        android:layout_marginBottom="40dp"

        android:layout_marginRight="26dp"

        android:layout_toLeftOf="@+id/textView2"

        android:text="Stop" />

    <Button

        android:id="@+id/button1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/button2"

        android:layout_alignBottom="@+id/button2"

        android:layout_toRightOf="@+id/textView1"

        android:text="Play" />

    <TextView

        android:id="@+id/textView2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_above="@+id/seekBar1"

        android:layout_alignRight="@+id/seekBar1"

        android:layout_marginRight="15dp"

        android:text="0:00" />

    <TextView

        android:id="@+id/textView1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBaseline="@+id/textView2"

        android:layout_alignBottom="@+id/textView2"

        android:layout_alignLeft="@+id/seekBar1"

        android:layout_marginLeft="16dp"

        android:text="0:00" />

</RelativeLayout>

2.MainActivity.java

package com.sri.seekbar;

import android.app.Activity;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity implements Runnable,

OnClickListener, OnSeekBarChangeListener {

private SeekBar seekBar;

private Button startMedia;

private Button stopMedia;

private MediaPlayer mp;

TextView tv1, tv2;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

seekBar = (SeekBar) findViewById(R.id.seekBar1);

startMedia = (Button) findViewById(R.id.button1);

stopMedia = (Button) findViewById(R.id.button2);

tv1 = (TextView) findViewById(R.id.textView1);

tv2 = (TextView) findViewById(R.id.textView2);

startMedia.setOnClickListener(this);

stopMedia.setOnClickListener(this);

seekBar.setOnSeekBarChangeListener(this);

seekBar.setEnabled(false);

}

public void run() {

int currentPosition = mp.getCurrentPosition();

int total = mp.getDuration();

while (mp != null && currentPosition < total) {

try {

Thread.sleep(1000);

currentPosition = mp.getCurrentPosition();

} catch (InterruptedException e) {

return;

} catch (Exception e) {

return;

}

seekBar.setProgress(currentPosition);

}

}

public void onClick(View v) {

if (v.equals(startMedia)) {

if (mp == null) {

mp = MediaPlayer.create(getApplicationContext(), R.raw.song2);

seekBar.setEnabled(true);

}

if (mp.isPlaying()) {

mp.pause();

startMedia.setText("play");

} else {

mp.start();

startMedia.setText("pause");

seekBar.setMax(mp.getDuration());

new Thread(this).start();

}

}

if (v.equals(stopMedia) && mp != null) {

if (mp.isPlaying() || mp.getDuration() > 0) {

mp.stop();

mp = null;

startMedia.setText("play");

seekBar.setProgress(0);

tv1.setText("0:00");

tv2.setText("0:00");

}

}

}

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

try {

if (mp.isPlaying() || mp != null) {

if (fromUser)

mp.seekTo(progress);

} else if (mp == null) {

Toast.makeText(getApplicationContext(), "Media is not running",

Toast.LENGTH_SHORT).show();

seekBar.setProgress(0);

}

tv1.setText("" + milliSecondsToTimer(progress));

tv2.setText("" + milliSecondsToTimer(mp.getDuration()));

} catch (Exception e) {

Log.e("seek bar", "" + e);

seekBar.setEnabled(false);

}

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

public String milliSecondsToTimer(long milliseconds) {

String finalTimerString = "";

String secondsString = "";

// Convert total duration into time

int hours = (int) (milliseconds / (1000 * 60 * 60));

int minutes = (int) (milliseconds % (1000 * 60 * 60)) / (1000 * 60);

int seconds = (int) ((milliseconds % (1000 * 60 * 60)) % (1000 * 60) / 1000);

// Add hours if there

if (hours > 0) {

finalTimerString = hours + ":";

}

// Prepending 0 to seconds if it is one digit

if (seconds < 10) {

secondsString = "0" + seconds;

} else {

secondsString = "" + seconds;

}

finalTimerString = finalTimerString + minutes + ":" + secondsString;

// return timer string

return finalTimerString;

}

}

3.That's it  now run your Project and see the text view changes with the progress bar.

Thank you

Simple seek bar implementation for media player

How to use seek bar for media player with seeking user position

This is how we run a simple seek bar implementation for the music player.

Media is from res/raw folder so pleasr add one song1.mp3 file.

1.activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:gravity="center"

    android:orientation="vertical" >

    <SeekBar

        android:id="@+id/seekBar1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" />

    <Button

        android:id="@+id/button1"

        style="?android:attr/buttonStyleSmall"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Play" />

    <Button

        android:id="@+id/button2"

        style="?android:attr/buttonStyleSmall"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Stop" />

</LinearLayout>

2.MainActivity.java

package com.sri.seekbar;

import android.app.Activity;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.SeekBar;

import android.widget.SeekBar.OnSeekBarChangeListener;

import android.widget.Toast;

public class MainActivity extends Activity implements Runnable,

OnClickListener, OnSeekBarChangeListener {

private SeekBar seekBar;

private Button startMedia;

private Button stopMedia;

private MediaPlayer mp;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

seekBar = (SeekBar) findViewById(R.id.seekBar1);

startMedia = (Button) findViewById(R.id.button1);

stopMedia = (Button) findViewById(R.id.button2);

startMedia.setOnClickListener(this);

stopMedia.setOnClickListener(this);

seekBar.setOnSeekBarChangeListener(this);

seekBar.setEnabled(false);

}

public void run() {

int currentPosition = mp.getCurrentPosition();

int total = mp.getDuration();

while (mp != null && currentPosition < total) {

try {

Thread.sleep(1000);

currentPosition = mp.getCurrentPosition();

} catch (InterruptedException e) {

return;

} catch (Exception e) {

return;

}

seekBar.setProgress(currentPosition);

}

}

public void onClick(View v) {

if (v.equals(startMedia)) {

if (mp == null) {

mp = MediaPlayer.create(getApplicationContext(), R.raw.song2);

seekBar.setEnabled(true);

}

if (mp.isPlaying()) {

mp.pause();

startMedia.setText("play");

} else {

mp.start();

startMedia.setText("pause");

seekBar.setMax(mp.getDuration());

new Thread(this).start();

}

}

if (v.equals(stopMedia) && mp != null) {

if (mp.isPlaying() || mp.getDuration() > 0) {

mp.stop();

mp = null;

startMedia.setText("play");

seekBar.setProgress(0);

}

}

}

public void onProgressChanged(SeekBar seekBar, int progress,

boolean fromUser) {

try {

if (mp.isPlaying() || mp != null) {

if (fromUser)

mp.seekTo(progress);

} else if (mp == null) {

Toast.makeText(getApplicationContext(), "Media is not running",

Toast.LENGTH_SHORT).show();

seekBar.setProgress(0);

}

} catch (Exception e) {

Log.e("seek bar", "" + e);

seekBar.setEnabled(false);

}

}

@Override

public void onStartTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

@Override

public void onStopTrackingTouch(SeekBar seekBar) {

// TODO Auto-generated method stub

}

}

3.Its over. Easily user can touch and seek the music now.

Thank You.

How to create a Splash Screen?????

Splash Screen in Android

Now we'll learn to create Splash Screen.

Basically the Splash screen is showed to advertise or to load some heavy data previous to starting the Application.

The Example is shown below.

1.activity_main.xml

<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" >

    <ImageView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:src="@drawable/splash" />

    <TextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true"

        android:text="Loading..."

        android:textSize="24sp" />

</RelativeLayout>

2. MainActivity.java

package com.sri.splash;

import android.os.Bundle;

import android.os.Handler;

import android.app.Activity;

import android.content.Intent;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

new Handler().postDelayed(new Runnable() {

@Override

public void run() {

// TODO Auto-generated method stub

Intent i=new Intent(getApplicationContext(), Second.class);

startActivity(i);

finish();

}

}, 3000);

}

}

Note:Create one new class Second.java and xml layout file second.xml.

3. Second.java

package com.sri.splash;

import android.app.Activity;

import android.os.Bundle;

public class Second extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.second);

}

}

4. second.xml

<?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="wrap_content"

        android:layout_height="wrap_content"

        android:text="Hello world"

        android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

5.AndroidManifest.xml

<activity

            android:name="com.sri.splash.MainActivity"

            android:label="@string/app_name" 

            android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name="com.sri.splash.Second"

            android:theme="@android:style/Theme.Black.NoTitleBar.Fullscreen">

</activity>

6. Don't Forget to add the splash.png image in res/drawable

Thank you.

Android Screen Dimension

How to get the Screen Dimension in Android Application

Hi, This is the way to easily get the screen dimensions of currently running android device.

1.activity_main.xml

<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" >

    <TextView

        android:id="@+id/dimen"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="screen dimensions" />

    <TextView

        android:id="@+id/res"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/hello_world" 

        android:layout_below="@+id/dimen"/>

</RelativeLayout>

2.MainActivity.java

package com.sri.screendimension;

import android.os.Bundle;

import android.view.Display;

import android.widget.TextView;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.graphics.Point;

public class MainActivity extends Activity {

TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Display disp = getWindowManager().getDefaultDisplay();

Point size = new Point();

disp.getSize(size);

int width = size.x;

int height = size.y;

tv = (TextView) findViewById(R.id.res);

tv.setText(width + "<----->" + height);

}

}

3.Run the Application.

Set Wallpaper in Android

Easy Way to Android Set Wallpaper

There is a easy way to set the wallpaper from the resources folder of your application to the android smartphone.You can set it through program.

1. Add the permissions in the Android Manifest file.

<uses-permission android:name="android.permission.SET_WALLPAPER" />

2. MainActivity.java

import java.io.IOException;

import android.os.Bundle;

import android.app.Activity;

import android.app.WallpaperManager;

import android.view.Menu;

public class MainActivity extends Activity {

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_main);

  

  //android wallpaper manager

  WallpaperManager myWallpaperManager = WallpaperManager

    .getInstance(getApplicationContext());

  try {

   //set wallpaper picture from resource here

   myWallpaperManager.setResource(R.drawable.android_wallpaper);

   Toast.makeText(getApplicationContext(),"Success set as wallpaper",Toast.LENGTH_SHORT).show();

  } catch (IOException e) {

   Toast.makeText(getApplicationContext(),"Error on setting as wallpaper",Toast.LENGTH_SHORT).show();

  }

 }

}   

3. Now run your Application.(Dont Forget to put an image in res/drawable folder named android_wallpaper)

Thank you.

Multiple Button Click Listener

Multiple Button Listener

Now we'll learn how to manage Multiple Button click Event Listener.
As you have learn the single button click event in previous tutorial.
Now we'll Move to the Multiple Buttons Tutorial.

1.activity_main.xml

<LinearLayout 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" 
    android:orientation="vertical">

    <Button
        android:id="@+id/btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test1" />
    <Button
        android:id="@+id/btn2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test2" />
    <Button
        android:id="@+id/btn3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test3" />
    <Button
        android:id="@+id/btn4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="test4" />


</LinearLayout>


2.MainActivity.java

package com.sri.buttontest;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{
Button btn1,btn2,btn3,btn4;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn1 = (Button) findViewById(R.id.btn1);
btn2 = (Button) findViewById(R.id.btn2);
btn3 = (Button) findViewById(R.id.btn3);
btn4 = (Button) findViewById(R.id.btn4);
btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
btn3.setOnClickListener(this);
btn4.setOnClickListener(this);
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn1:
Toast.makeText(getApplicationContext(), "test1 is clicked", Toast.LENGTH_LONG).show();
break;
case R.id.btn2:
Toast.makeText(getApplicationContext(), "test2 is clicked", Toast.LENGTH_LONG).show();
break;
case R.id.btn3:
Toast.makeText(getApplicationContext(), "test3 is clicked", Toast.LENGTH_LONG).show();
break;
case R.id.btn4:
Toast.makeText(getApplicationContext(), "test4 is clicked", Toast.LENGTH_LONG).show();
break;
default:
break;
}
}

}

3. That's all.Run the Project Now.

Comments and doubts are encouraged.

Thank you.

Simple Button Listener

Button Event Listener

New for Android, then go step by step.

First we will learn the button click event.

First write the xml file in new project.

1.activity_main.xml

<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/btn1"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_centerHorizontal="true"

        android:layout_centerVertical="true"

        android:text="test" />

</RelativeLayout>

MainActivity.java

package com.sri.buttontest;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends Activity {

Button btn;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btn = (Button) findViewById(R.id.btn1);

btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

Toast.makeText(getApplicationContext(), "Test is clicked",

Toast.LENGTH_LONG).show();

}

});

}

}

3.Now this is how the button listener works.

Thank you.