surfaceview

          	@Override
    	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        		onSizeChanged(width, height, 0, 0);
        	}

            	@Override
    	public void surfaceCreated(SurfaceHolder holder) {
        		drawThread = new DrawThread(holder);
        		drawThread.setRunning(true);
        		drawThread.start();

                	}

            	@Override
    	public void surfaceDestroyed(SurfaceHolder holder) {
        	    boolean retry = true;
            drawThread.setRunning(false);
        	    while (retry) {
           	        try {
                            drawThread.join();
                            retry = false;
                	        } catch (InterruptedException e) {
                	            // we will try it again and again...
                        	        }
            	    }
        	}

            	class DrawThread extends Thread {
        	    private SurfaceHolder surfaceHolder;
        	    private boolean running = false;

                	    public DrawThread(SurfaceHolder surfaceHolder){
                	this.surfaceHolder = surfaceHolder;
                }

                	    public void setRunning(boolean value){
                	running = value;
            	    }

                		@Override
        		public void run() {
            		    Canvas c;
            		    while (running) {
                	        c = null;
                		        try {
                    	            c = surfaceHolder.lockCanvas(null);
                    		            synchronized (surfaceHolder) {
                        	                draw(c);
                        	            }
                    	        } finally {
                    	            if (c != null) {
                        		            	surfaceHolder.unlockCanvasAndPost(c);
                        		            }
                    		        }
                	    }
            		}
        	}