Rotate Animation sample using XML in Android

I would like to share this example of Rotation Animation as this may be very helpful to the needy one.

In this example, I’ll try to introduce you doing simple animations with Android. It is simple enough that on clicking a button, an images starts rotating from 0 degree to 360 degree in N seconds. Lets begin with the animation XML. Once you have created a new Android project, create a folder named "anim" in res and a file named 'rotator.xml' inside res/anim. 

res/anim/rotator.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/linear_interpolator">
  <rotate
      android:fromDegrees="0"
      android:toDegrees="360"
      android:pivotX="50%"
      android:pivotY="50%"
      android:duration="2000"
      android:startOffset="0"/>
</set>

Then open res/main.xml, after removing the default textView in the layout, add an ImageView and Button into the layout. Set the src property of the ImageView as your filename of the added image, for example android:src="@drawable/myimg" 

res/main.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"
    android:orientation="vertical" >
    <ImageView
        android:id="@+id/img_View"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@drawable/myimg" />
    <Button
        android:id="@+id/btn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"  />
</RelativeLayout>

OK, lets edit the main class. In the onClick() for the button, add the necessary code for running the animation. Check the following code. 

MainActivity.java
package com.example.ImageRotation;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button btn = (Button) findViewById(R.id.btn);
      
        btn.setOnClickListener(new OnClickListener()    {
            @Override
            public void onClick(View arg0) {
                final ImageView myImage = (ImageView)findViewById(R.id.img_View);
                final Animation myRotation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.rotator);
                myImage.startAnimation(myRotation);
            }
        });
    }
}