Animation is generally used to make user interface more attractive and pleasant.
In android, we can  have the animation from many ways.

We call a static function loadAnimation() of the class AnimationUtils. to perform animation in android.

Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.myanimation);

Here is the example to achieve zooming animation :-

Step 1:-  Create anim folder under under res directory, and place given two anim xml files there.

(a) zoom_in.xml
Here, we have set the different attributes to show the effects

<?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="1000"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:repeatCount="infinite"
        android:repeatMode="reverse"
        android:toXScale="1.5"
        android:toYScale="1.5"></scale>
</set>

(b) zoom_out.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="1000"
        android:fromXScale="1"
        android:fromYScale="1"
        android:pivotX="50%"
        android:pivotY="50%"
        android:repeatCount="infinite"
        android:repeatMode="reverse"
        android:toXScale="0.5"
        android:toYScale="0.5"></scale>
</set>

Step:-2 Declare and initialize the necessary variable and views

private ImageView mImageView;
private Animation animZoomIn,animZoomOut;
animZoomIn=AnimationUtils.loadAnimation(getApplicationContext(),R.anim.zoom_in);
animZoomOut=AnimationUtils.loadAnimation(getApplicationContext(),R.anim.zoom_out);

Step :-3 Include given functions in your activity, and call them in your desired listners:-

(a) function to show animation effects

private void showZoomEffect(Animation  animType) {
   mImageView.startAnimation(animType);
}

(b) function to remove animation effect
Here, animType is the animation (animZoomIn/animZoomOut) according to your requirement

private void removeZoomEffect(Animation animType){
mImageView.clearAnimation();
}