Android UI How to - Create ScaleAnimation

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The following code shows how to Create ScaleAnimation.

Example

Main layout xml file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
  <ImageView
    android:id="@+id/flip_image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
  />
</RelativeLayout>

Main Activity Java code

package com.java2s.myapplication3.app;
/* www  .  j  av a2 s. c  o  m*/
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.animation.Animation;
import android.view.animation.ScaleAnimation;
import android.widget.ImageView;

public class MainActivity extends Activity {

    boolean isHeads;
    ScaleAnimation shrink, grow;
    ImageView flipImage;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        flipImage = (ImageView)findViewById(R.id.flip_image);
        flipImage.setImageResource(R.drawable.ic_launcher);
        isHeads = true;

        shrink = new ScaleAnimation(.3f, 0.4f, 1.0f, 1.0f,
                ScaleAnimation.RELATIVE_TO_SELF, 0.5f,
                ScaleAnimation.RELATIVE_TO_SELF, 0.5f);
        shrink.setDuration(150);
        shrink.setAnimationListener(new Animation.AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {}

            @Override
            public void onAnimationRepeat(Animation animation) {}

            @Override
            public void onAnimationEnd(Animation animation) {
                isHeads = false;
                flipImage.setImageResource(R.drawable.ic_launcher);
                flipImage.startAnimation(grow);
            }
        });
        grow = new ScaleAnimation(0.0f, 1.0f, 1.0f, 1.0f,
                ScaleAnimation.RELATIVE_TO_SELF, 0.5f,
                ScaleAnimation.RELATIVE_TO_SELF, 0.5f);
        grow.setDuration(150);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if(event.getAction() == MotionEvent.ACTION_DOWN) {
            flipImage.startAnimation(shrink);
            return true;
        }
        return super.onTouchEvent(event);
    }
}

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