How to reverse animation in android

In this android programming source code example, we are going to reverse animation in android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to reverse animation in android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:orientation="vertical" xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".animation.Animation11">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Reverse Animation"/>

    <ImageView
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/notebook"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/start"
        android:text="Start"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Reverse"
        android:id="@+id/reverse"/>

</LinearLayout>

MainActivity.java

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.widget.Button;
import android.widget.ImageView;


public class Animation11 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_animation11);

        Button start = findViewById(R.id.start);
        Button reverse = findViewById(R.id.reverse);

        final ImageView imageView = findViewById(R.id.image);

        start.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.rotation);
                imageView.startAnimation(animation);
            }
        });

        reverse.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.rotation);
                imageView.startAnimation(animation);
                animation.setInterpolator(new ReverseInterpolator());
            }
        });

    }

    public class ReverseInterpolator implements Interpolator {
        @Override
        public float getInterpolation(float paramFloat) {
            return Math.abs(paramFloat -1f);
        }
    }
}

anim/rotation.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/cycle_interpolator">
    <rotate android:fromDegrees="0"
        android:toDegrees="360"
        android:pivotX="50%"
        android:pivotY="50%"
        android:duration="10000" />
</set>

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