Animation on scale

Create /res/anim/enlarge.xml

 android:interpolator="@android:anim/accelerate_interpolator">
   android:fromXScale="0.1"
  android:toXScale="3.0"
  android:fromYScale="0.1"
  android:toYScale="3.0"
  android:duration="1000"
  android:pivotX="50%"
  android:pivotY="50%"
  android:startOffset="100" />

Create /res/anim/shrink.xml

 android:interpolator="@android:anim/accelerate_interpolator">
   android:fromXScale="3.0"
  android:toXScale="0.1"
  android:fromYScale="3.0"
  android:toYScale="0.1"
  android:duration="1000"
  android:pivotX="50%"
  android:pivotY="50%"
  android:startOffset="100" />

main.xml layout

    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    android:id="@+id/image1" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:src="@drawable/icon"
    />
    android:id="@+id/image2" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:src="@drawable/icon"
    />
    android:id="@+id/image3" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:src="@drawable/icon"
    />

Main code

package com.exercise.AndroidAnimation;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;

public class AndroidAnimationActivity extends Activity {
 
 ImageView image1, image2, image3;
 Animation animationEnlarge, animationShrink;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        image1 = (ImageView)findViewById(R.id.image1);
        image2 = (ImageView)findViewById(R.id.image2);
        image3 = (ImageView)findViewById(R.id.image3);
        
        animationEnlarge = AnimationUtils.loadAnimation(this, 
          R.anim.enlarge);
        animationShrink = AnimationUtils.loadAnimation(this, 
          R.anim.shrink);
        animationEnlarge.setAnimationListener(animationEnlargeListener);
        animationShrink.setAnimationListener(animationShrinkListener);

        image2.startAnimation(animationEnlarge);

    }

 @Override
 protected void onPause() {
  // TODO Auto-generated method stub
  super.onPause();
  image2.clearAnimation();
 }
  
 AnimationListener animationEnlargeListener
 = new AnimationListener(){

  @Override
  public void onAnimationEnd(Animation animation) {
   // TODO Auto-generated method stub
   image2.startAnimation(animationShrink);

  }

  @Override
  public void onAnimationRepeat(Animation animation) {
   // TODO Auto-generated method stub
   
  }

  @Override
  public void onAnimationStart(Animation animation) {
   // TODO Auto-generated method stub
   
  }};
   
 AnimationListener animationShrinkListener
 = new AnimationListener(){
   @Override
  public void onAnimationEnd(Animation animation) {
   // TODO Auto-generated method stub
    image2.startAnimation(animationEnlarge);
  }

  @Override
  public void onAnimationRepeat(Animation animation) {
   // TODO Auto-generated method stub
   
  }
  @Override
  public void onAnimationStart(Animation animation) {
   // TODO Auto-generated method stub
    
  }};
}

Download the files.