用Surfaceview实现无限循环的游戏背景图简单示例：

1.先上解析,实现循环的原理：

2.自定义surfaceview,并addcallback(this) 

在重写的方法中，操作

@Override
    public void surfaceCreated(SurfaceHolder holder) {
        start();
    }

private void start() {
        updatethread = new UpdateViewThread();
        updatethread.start();
    }

public void run() {
            while (true) {
                if ((back.getWidth() - startx) <= 0){
                    startx = 0;
                    continue;
                }
                Canvas canvas = surfaceHolder.lockCanvas();

                Log.i("mydate", "  " + back.getWidth());
                Matrix matrix1 = new Matrix();
                matrix1.setScale(1f, (float) MainActivity.windowheight / (float) back.getHeight());
                if (back.getWidth() - startx < MainActivity.windowwidth) {

                    Bitmap b = Bitmap.createBitmap(back, startx, 0, back.getWidth() - startx, back.getHeight(), matrix1, false);
                    Bitmap b2 = Bitmap.createBitmap(back, 0, 0, width - (back.getWidth() - startx), back.getHeight(), matrix1, false);
                    canvas.drawBitmap(b, 0, 0, null);
                    canvas.drawBitmap(b2, 0 + back.getWidth() - startx, 0, null);
                } else {
                    Bitmap bitmap = Bitmap.createBitmap(back, startx, starty, width, height, matrix, false);
                    canvas.drawBitmap(bitmap, 0, 0, null);
                }
                surfaceHolder.unlockCanvasAndPost(canvas);

                startx += 20;
                try {
                    Thread.sleep(60);
                } catch (Exception e) {
                    e.printStackTrace();
                }

            }