Apply animation on Button

Create four XML files for animation:
/res/anim/anim_alpha.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
   android:interpolator="@android:anim/linear_interpolator">
   <alpha
       android:fromAlpha="1.0"
       android:toAlpha="0.1"
       android:duration="500"
       android:repeatCount="1"
       android:repeatMode="reverse" />
</set>

/res/anim/anim_rotate.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
   android:interpolator="@android:anim/linear_interpolator">
   <rotate
       android:fromDegrees="0"
       android:toDegrees="360"
       android:pivotX="50%"
       android:pivotY="50%"
       android:duration="500"
       android:startOffset="0"
       android:repeatCount="1"
       android:repeatMode="reverse" />
</set>

/res/anim/anim_scale.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
   android:interpolator="@android:anim/linear_interpolator">
   <scale
       android:fromXScale="1.0"
       android:toXScale="3.0"
       android:fromYScale="1.0"
       android:toYScale="3.0"
       android:pivotX="50%"
       android:pivotY="50%"
       android:duration="500"
       android:repeatCount="1"
       android:repeatMode="reverse" />
</set>

/res/anim/anim_translate.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
   android:interpolator="@android:anim/linear_interpolator">
   <translate
       android:fromXDelta="0"
       android:toXDelta="100%p"
       android:duration="500"
       android:repeatCount="1"
       android:repeatMode="reverse"/>
</set>

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" >

   <TextView
       android:layout_width="fill_parent"
       android:layout_height="wrap_content"
       android:text="@string/hello" />

   <Button
       android:id="@+id/translate"
       android:layout_width="200dp"
       android:layout_height="wrap_content"
       android:layout_margin="10dp"
       android:text="Translate" />
   <Button
       android:id="@+id/alpha"
       android:layout_width="200dp"
       android:layout_height="wrap_content"
       android:layout_margin="10dp"
       android:text="Alpha" />
   <Button
       android:id="@+id/scale"
       android:layout_width="200dp"
       android:layout_height="wrap_content"
       android:layout_margin="10dp"
       android:text="Scale" />
   <Button
       android:id="@+id/rotate"
       android:layout_width="200dp"
       android:layout_height="wrap_content"
       android:layout_margin="10dp"
       android:text="Rotate" />

</LinearLayout>

Main activity:

package com.exercise.AndroidAnimButtons;

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.Button;

public class AndroidAnimButtonsActivity extends Activity {
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);
      
       final Animation animTranslate = AnimationUtils.loadAnimation(this, R.anim.anim_translate);
       final Animation animAlpha = AnimationUtils.loadAnimation(this, R.anim.anim_alpha);
       final Animation animScale = AnimationUtils.loadAnimation(this, R.anim.anim_scale);
       final Animation animRotate = AnimationUtils.loadAnimation(this, R.anim.anim_rotate);
      
       Button btnTranslate = (Button)findViewById(R.id.translate);
       Button btnAlpha = (Button)findViewById(R.id.alpha);
       Button btnScale = (Button)findViewById(R.id.scale);
       Button btnRotate = (Button)findViewById(R.id.rotate);
      
       btnTranslate.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   arg0.startAnimation(animTranslate);
  }});
      
       btnAlpha.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   arg0.startAnimation(animAlpha);
  }});
      
       btnScale.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   arg0.startAnimation(animScale);
  }});
      
       btnRotate.setOnClickListener(new Button.OnClickListener(){

  @Override
  public void onClick(View arg0) {
   arg0.startAnimation(animRotate);
  }});
   }
}

Download the files.

Next:
- Handle AnimationListener