how to zoom_in animation in android

res/animation/zoom_in.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true" >

    <scale
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:duration="2000"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="3"
        android:toYScale="3" >
    </scale>

</set>
res/layout/activity_zoom_in.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
   
    <ImageView android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_launcher/>
   
    <Button android:id="@+id/btn_Start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Start Animation/>
   
</RelativeLayout>

MainActivity.java

package example.animations;

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.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements AnimationListener {

    ImageView image;
    Button btn_Start;
    Animation animationZoom_in;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_zoom_in);

        image= (ImageView) findViewById(R.id.image);
        btn_Start= (Button) findViewById(R.id.btn_Start);

      
        animationRotate= AnimationUtils.loadAnimation(getApplicationContext(),R.anim.zoom_in);
        animationRotate.setAnimationListener(this);

        btn_Start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
            
               image.startAnimation(animationZoom_in);
            }
        });

    }

    @Override
    public void onAnimationEnd(Animation animation) {
             if (animation == animationZoom_in) {
        }

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

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

    }

}