android Zxing实现连续扫码但是结果却是最后一次扫码的

 //实现连续扫码！
    private void continuePreview(){
        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        initCamera(surfaceHolder);
        if (handler != null){
            handler.restartPreviewAndDecode(); 
        }     
     }

请问这是怎么回事！

http://www.tuicool.com/articles/BVbYVbZ