Create Animation using Matrix

The former exercise demonstrate how to "Using Matrix create scaled bitmap". In this exercise, we will create animation using matrix.

package com.example.androidmatrixanimation;

import android.os.Bundle;
import android.app.Activity;
import android.graphics.Matrix;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.OvershootInterpolator;
import android.view.animation.Transformation;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

 Button myButton;
 ImageView myImage1, myImage2;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        myButton = (Button)findViewById(R.id.mybutton);
        myImage1 = (ImageView)findViewById(R.id.myimage1);
        myImage2 = (ImageView)findViewById(R.id.myimage2);
        
        myButton.setOnClickListener(myOnClickListener);
        myImage1.setOnClickListener(myOnClickListener);
        myImage2.setOnClickListener(myOnClickListener);

    }
    
    OnClickListener myOnClickListener
    = new OnClickListener(){

  @Override
  public void onClick(View v) {
   applyAnimation(v);
   
  } 
    };
    
    private void applyAnimation(View v){
     MyAnimation myAnimation = new MyAnimation();
  myAnimation.setDuration(5000);
  myAnimation.setFillAfter(true);
  myAnimation.setInterpolator(new OvershootInterpolator());
  
  v.startAnimation(myAnimation);
    }

    public class MyAnimation extends Animation{

  @Override
  protected void applyTransformation(float interpolatedTime,
    Transformation t) {
   super.applyTransformation(interpolatedTime, t);
   
   final Matrix matrix = t.getMatrix();
   matrix.setScale(interpolatedTime, interpolatedTime);
  }
    }
    
}

<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:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    <Button
        android:id="@+id/mybutton"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button" />
    <ImageView
        android:id="@+id/myimage1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scaleType="center"
        android:src="@drawable/ic_launcher" />
    <ImageView
        android:id="@+id/myimage2"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="center"
        android:src="@drawable/ic_launcher" />

</LinearLayout>

Download the files.

Download the APK.