How to create a Live Wallpaper

@arvind.kumar

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almost 10 years ago

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Follow the below steps to create Live Wallpaper

1. create a xml file which will describe your wallpaper screen.
2. edit manifest file and add service code
3. create a service class which extends WallpaperService class

<!--?xml version="1.0" encoding="UTF-8"?-->
       <wallpaper
                 xmlns:android="http://schemas.android.com/apk/res/android"
                 android:thumbnail="@drawable/ic_launcer"
                 android:description="@string/wallpaper_description" 
       /> 

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="16" />

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

<application
    android:icon="@drawable/ic_auncher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <service
        android:name="MyLiveWallpaperService"
        android:enabled="true"
        android:label="Wallpaper Example "
        android:permission="android.permission.BIND_WALLPAPER" >
        <intent-filter>
            <action android:name="android.service.wallpaper.WallpaperService" >
            </action>
        </intent-filter>

        <meta-data
            android:name="android.service.wallpaper"
            android:resource="@xml/mywallpaper" >
        </meta-data>
    </service>

</application>

this class is the base class for all live wallpapers in the system. You must implement the onCreateEngine() method . The Engine class defines the life cycle methods, as for example onCreate(), onSurfaceCreated(), onVisibilityChanged(), onOffsetsChanged(), onTouchEvent() and onCommand().

public class MyLiveWallpaperService extends WallpaperService
{
                int x,y;</p>

          public void onCreate()
            {
                    super.onCreate();
            }

            public void onDestroy()
            {
                    super.onDestroy();
            }

            public Engine onCreateEngine()
            {
                    return new MyWallpaperEngine();
            }

            class MyWallpaperEngine extends Engine
            {

                    private final Handler handler = new Handler();
                    private final Runnable drawRunner = new Runnable() {
                        @Override
                        public void run() {
                            draw();
                        }
                    };
                    private boolean visible = true;
                    public Bitmap image1,backgroundImage;

                    MyWallpaperEngine()
                    {
                             // get the fish and background image references
                            image1 = BitmapFactory.decodeResource(getResources(),R.drawable.fish);
                            backgroundImage = BitmapFactory.decodeResource(getResources(),R.drawable.background);
                            x=-130; // initialize x position
                            y=200;  // initialize y position

                    }


                    public void onCreate(SurfaceHolder surfaceHolder)
                    {
                            super.onCreate(surfaceHolder);
                    }

                    @Override
                    public void onVisibilityChanged(boolean visible)
                    {
                            this.visible = visible;
                            // if screen wallpaper is visible then draw the image otherwise do not draw
                            if (visible)
                            {
                                handler.post(drawRunner);
                            }
                            else
                            {
                                handler.removeCallbacks(drawRunner);
                            }
                    }

                    @Override
                    public void onSurfaceDestroyed(SurfaceHolder holder)
                    {
                            super.onSurfaceDestroyed(holder);
                            this.visible = false;
                            handler.removeCallbacks(drawRunner);
                    }

                    public void onOffsetsChanged(float xOffset, float yOffset, float xStep, float yStep, int xPixels, int yPixels)
                    {
                            draw();
                    }

                    void draw()
                    {
                            final SurfaceHolder holder = getSurfaceHolder();

                            Canvas c = null;
                            try
                            {
                                    c = holder.lockCanvas();
                                    // clear the canvas
                                    c.drawColor(Color.BLACK);
                                    if (c != null)
                                    {
                                            // draw the background image
                                            c.drawBitmap(backgroundImage, 0, 0, null);
                                            // draw the fish
                                            c.drawBitmap(image1, x,y, null);
                                            // get the width of canvas
                                            int width=c.getWidth();

                                            // if x crosses the width means  x has reached to right edge
                                            if(x&gt;width+100)
                                            {  
                                                    // assign initial value to start with
                                                    x=-130;
                                            }
                                            // change the x position/value by 1 pixel
                                            x=x+1;
                                    }
                             }
                            finally
                            {
                                    if (c != null)
                                           holder.unlockCanvasAndPost(c);
                            }

                            handler.removeCallbacks(drawRunner);
                            if (visible)
                            {
                                      handler.postDelayed(drawRunner, 10); // delay 10 mileseconds
                            }   

                    }
            }

}