Problem in displaying Bitmaps on canvas

I am have some bitmaps which i want to display serially one after another but my code displays only last bitmap.Can anybody tell me why is it happening? here is the code

class Panel extends SurfaceView implements SurfaceHolder.Callback {

    private boolean _run = false;

    public Panel(Context context) {

        super(context);

        getHolder().addCallback(this);

        _run = true;

    }

    @Override
    public void onDraw(Canvas canvas) {



    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

        Log.i("Read","surfaceChanged is called");
    }

    @Override
    public void surfaceCreated(SurfaceH开发者_StackOverflow社区older holder) {

        Log.i("Read","surfaceCreated is called");

        while (_run ) {

            display();
        }


    }

    public void display() {

        Canvas c;

        c = null;

        try {

            c = getHolder().lockCanvas(null);

            synchronized (getHolder()) {

                onPreviewFrame();

                invalidate();

                c.drawColor(Color.BLACK);

                c.drawBitmap(bmp, 10, 10, null);

                //panel.surfaceDestroyed(panel.getHolder());
            }

        } finally {

            if (c != null) {

                getHolder().unlockCanvasAndPost(c);
            }

        }


    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

        Log.i("Read","surfaceDestroyed is called");

        _run = false;


    }

  }

I am not sure what your requirement is but if your are trying to create a continous horizontal image scroll. Take a look at this https://github.com/blessenm/SlideshowDemo