Sample GIF Wallpaper Service implementation (Android WallpaperService)

SampleGIFWallpaperService.java

import android.graphics.Canvas;
import android.graphics.Movie;
import android.os.Handler;
import android.service.wallpaper.WallpaperService;
import android.util.Log;
import android.view.SurfaceHolder;
import java.io.IOException;

public class SampleGIFWallpaperService extends WallpaperService {

    @Override
    public SampleGIFWallpaperService.Engine onCreateEngine() {
        try{
            Movie movie = Movie.decodeStream(getResources().getAssets().open("nature.gif"));
            return new GIFWallpaperEngine(movie);
        } catch(IOException e) {
            Log.d("GIF", "Asset loading unsuccessful");
            return null;
        }
    }

    private class GIFWallpaperEngine extends WallpaperService.Engine {

        private final int frameDuration = 20;
        private SurfaceHolder holder;
        private Movie movie;
        private boolean visible;
        private Handler handler;

        public GIFWallpaperEngine(Movie movie) {
            this.movie = movie;
            handler = new Handler();
        }

        @Override
        public void onCreate(SurfaceHolder surfaceHolder) {
            super.onCreate(surfaceHolder);
            this.holder = surfaceHolder;
        }

        private Runnable drawGIF = new Runnable() {
            @Override
            public void run() {
                draw();
            }
        };

        private void draw() {
            if(visible) {
                Canvas canvas = holder.lockCanvas();
                canvas.save();
                // Adjust size and position of the wallpaper image
                canvas.scale(3f, 3f);
                movie.draw(canvas, -100, 0);
                canvas.restore();
                holder.unlockCanvasAndPost(canvas);
                movie.setTime((int) (System.currentTimeMillis() % movie.duration()));
                handler.removeCallbacks(drawGIF);
                handler.postDelayed(drawGIF, frameDuration);
            }
        }

        @Override
        public void onVisibilityChanged(boolean visible) {
            this.visible = visible;
            if(visible) {
                handler.post(drawGIF);
            } else {
                handler.removeCallbacks(drawGIF);
            }
        }

        @Override
        public void onDestroy() {
            super.onDestroy();
            handler.removeCallbacks(drawGIF);
        }
    }
}

This implementation also requires special declaration in AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.serjardovic.livewallpaper">

    <uses-feature
        android:name="android.software.live_wallpaper"
        android:required="true">
        </uses-feature>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <service android:name=".GIFWallpaperService"
            android:enabled="true"
            android:label="GIF Wallpaper"
            android:permission="android.permission.BIND_WALLPAPER">
            <intent-filter>
                <action android:name="android.service.wallpaper.WallpaperService"/>
            </intent-filter>
            <meta-data
                android:name="android.service.wallpaper"
                android:resource="@xml/wallpaper">
            </meta-data>
        </service>
    </application>
</manifest>