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copied!<pre><code>public class TouchBall extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); int w=getWindowManager().getDefaultDisplay().getWidth()-25; int h=getWindowManager().getDefaultDisplay().getHeight()-25; BallView ballView=new BallView(this,w,h); setContentView(ballView); } } public class BallView extends SurfaceView implements SurfaceHolder.Callback { private Bitmap bitmap ; private MyThread thread; private int x=20,y=20;int width,height; public BallView(Context context,int w,int h) { super(context); width=w; height=h; thread=new MyThread(getHolder(),this); getHolder().addCallback(this); setFocusable(true); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); bitmap =BitmapFactory.decodeResource(getResources(), R.drawable.ball_green); canvas.drawColor(Color.BLUE);//To make background canvas.drawBitmap(bitmap,x-(bitmap.getWidth()/2),y-(bitmap.getHeight()/2),null); } @Override public boolean onTouchEvent(MotionEvent event) { x=(int)event.getX(); y=(int)event.getY(); if(x<25) x=25; if(x> width) x=width; if(y <25) y=25; if(y > 405) y=405; return true; } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) { // TODO Auto-generated method stub } @Override public void surfaceCreated(SurfaceHolder holder) { thread.startrun(true); thread.start(); } @Override public void surfaceDestroyed(SurfaceHolder holder) { thread.startrun(false); thread.stop(); } } </code></pre> <p>thread:</p> <pre><code>public class MyThread extends Thread { private SurfaceHolder msurfaceHolder; private BallView mballView; private boolean mrun =false; public MyThread(SurfaceHolder holder, BallView ballView) { msurfaceHolder = holder; mballView=ballView; } public void startrun(boolean run) { mrun=run; } @Override public void run() { super.run(); Canvas canvas; while (mrun) { canvas=null; try { canvas = msurfaceHolder.lockCanvas(null); synchronized (msurfaceHolder) { mballView.onDraw(canvas); } } finally { if (canvas != null) { msurfaceHolder.unlockCanvasAndPost(canvas); } } } } } </code></pre>

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