Cómo convertir un gif en un fondo de pantalla en vivo para su uso en la aplicación para Android

Vea la demostración de GIFLiveWallpaper mirar hacia fuera en el reps de github

public class GifLiveWallPaper extends WallpaperService { static final String TAG = "LIVE_WALLPAPER"; static final Handler liveHandler = new Handler(); @Override public Engine onCreateEngine() { try { return new WallPaperEngine(); } catch (IOException e) { Log.w(TAG, "Error creating WallPaperEngine", e); stopSelf(); return null; } } class WallPaperEngine extends Engine { private Movie liveMovie; private int duration; private Runnable runnable; float mScaleX; float mScaleY; int mWhen; long mStart; public WallPaperEngine() throws IOException { InputStream is = getResources().openRawResource(R.raw.sam); if (is != null) { try { liveMovie = Movie.decodeStream(is); duration = liveMovie.duration(); } finally { is.close(); } } else { throw new IOException("Unable to open R.raw.hand"); } mWhen = -1; runnable = new Runnable() { public void run() { nyan(); } }; } @Override public void onDestroy() { super.onDestroy(); liveHandler.removeCallbacks(runnable); } @Override public void onVisibilityChanged(boolean visible) { super.onVisibilityChanged(visible); if (visible) { nyan(); } else { liveHandler.removeCallbacks(runnable); } } @Override public void onSurfaceChanged(SurfaceHolder holder, int format, int width, int height) { super.onSurfaceChanged(holder, format, width, height); mScaleX = width / (1f * liveMovie.width()); mScaleY = height / (1f * liveMovie.height()); nyan(); } @Override public void onOffsetsChanged(float xOffset, float yOffset, float xOffsetStep, float yOffsetStep, int xPixelOffset, int yPixelOffset) { super.onOffsetsChanged(xOffset, yOffset, xOffsetStep, yOffsetStep, xPixelOffset, yPixelOffset); nyan(); } void nyan() { tick(); SurfaceHolder surfaceHolder = getSurfaceHolder(); Canvas canvas = null; try { canvas = surfaceHolder.lockCanvas(); if (canvas != null) { drawGif(canvas); } } finally { if (canvas != null) { surfaceHolder.unlockCanvasAndPost(canvas); } } liveHandler.removeCallbacks(runnable); if (isVisible()) { liveHandler.postDelayed(runnable, 1000L / 25L); } } void tick() { if (mWhen == -1L) { mWhen = 0; mStart = SystemClock.uptimeMillis(); } else { long mDiff = SystemClock.uptimeMillis() - mStart; mWhen = (int) (mDiff % duration); } } void drawGif(Canvas canvas) { canvas.save(); canvas.scale(mScaleX, mScaleY); liveMovie.setTime(mWhen); liveMovie.draw(canvas, 0, 0); canvas.restore(); } } }