public class SurfaceViewTest extends Activity
{
	// SurfaceHolder负责维护SurfaceView上绘制的内容
	private SurfaceHolder holder;
	private Paint paint;

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		paint = new Paint();
		SurfaceView surface = (SurfaceView) findViewById(R.id.show);
		// 初始化SurfaceHolder对象
		holder = surface.getHolder();
		holder.addCallback(new Callback()
		{
			@Override
			public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2,
					int arg3)
			{
			}

			@Override
			public void surfaceCreated(SurfaceHolder holder)
			{
				// 锁定整个SurfaceView
				Canvas canvas = holder.lockCanvas();
				// 绘制背景
				Bitmap back = BitmapFactory.decodeResource(
					SurfaceViewTest.this.getResources()
					, R.drawable.sun);
				// 绘制背景
				canvas.drawBitmap(back, 0, 0, null);
				// 绘制完成，释放画布，提交修改
				holder.unlockCanvasAndPost(canvas);
				// 重新锁一次，"持久化"上次所绘制的内容
				holder.lockCanvas(new Rect(0, 0, 0, 0));
				holder.unlockCanvasAndPost(canvas);
			}

			@Override
			public void surfaceDestroyed(SurfaceHolder holder)
			{
			}
		});
		// 为surface的触摸事件绑定监听器
		surface.setOnTouchListener(new OnTouchListener()
		{
			@Override
			public boolean onTouch(View source, MotionEvent event)
			{
				// 只处理按下事件
				if (event.getAction() == MotionEvent.ACTION_DOWN)
				{
					int cx = (int) event.getX();
					int cy = (int) event.getY();
					// 锁定SurfaceView的局部区域，只更新局部内容
					Canvas canvas = holder.lockCanvas(new Rect(cx - 50,
							cy - 50, cx + 50, cy + 50));
					// 保存canvas的当前状态
					canvas.save();
					// 旋转画布
					canvas.rotate(30, cx, cy);
					paint.setColor(Color.RED);
					// 绘制红色方块
					canvas.drawRect(cx - 40, cy - 40, cx, cy, paint);
					// 恢复Canvas之前的保存状态
					canvas.restore();
					paint.setColor(Color.GREEN);
					// 绘制绿色方块
					canvas.drawRect(cx, cy, cx + 40, cy + 40, paint);
					// 绘制完成，释放画布，提交修改
					holder.unlockCanvasAndPost(canvas);
				}
				return false;
			}
		});
	}
	}