Animation of Scale

Create /res/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="0.0"
        android:toXScale="1.0"
        android:fromYScale="0.0"
        android:toYScale="1.0"
        android:pivotX="50%"
        android:pivotY="50%"
        android:duration="2000" />
</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/animatescale"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Animate Scale"/>
 <LinearLayout
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:orientation="vertical" 
     android:gravity="center">

     <ImageView
         android:id="@+id/image"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:src="@drawable/ic_launcher" />
     
 </LinearLayout>    

</LinearLayout>

main activity:

package com.exercise.AndroidAnimTranslate;

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;
import android.widget.ImageView;

public class AndroidAnimTranslateActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        Button buttonAnimateScale = (Button)findViewById(R.id.animatescale);
        final ImageView image = (ImageView)findViewById(R.id.image);
        
        final Animation animationScale = AnimationUtils.loadAnimation(this, R.anim.scale);
        buttonAnimateScale.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
    // TODO Auto-generated method stub
    image.startAnimation(animationScale);
   }});
        
    }
}

Download the files.

Related article:
- Animate falling action using Animation of translate
- Tween animation: rotate
- Animate Fade In/Fade Out by changing Alpha