SurfaceView 依次无缝绘制多张图片，然后移动图片，发现移动时图片会有间隙。如何解决？

[我不得踢噶]

我的程序中有一个绘图线程ThreadDraw,源码如下：

    private Runnable threadDraw = new Runnable() {
        @Override
        public void run() {
            while(isRun) {
                Canvas c = null;
                try {
                    c = holder.lockCanvas();
                    if (c != null) {
                        c.drawColor(Color.WHITE);
                        Paint p = new Paint();
                        if (bitmap != null) {
                            for (int j = 0; j < 10; j++) {
                                for (int i = 0; i < 10; i++) {
                                    Rect src = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
                                    int x = (int) dX + i * bitmap.getWidth();
                                    int y = (int) dY + j * bitmap.getHeight();
                                    Point p0 = new Point(x, y);

                                    int x1 = x + bitmap.getWidth();
                                    int y1 = y + bitmap.getHeight();
                                    Point p1 = new Point(x1, y1);

                                    Rect dest = new Rect(p0.x, p0.y, p1.x, p1.y);
                                    c.drawBitmap(bitmap, src, dest, p);
                                }
                            }
                        }
                        holder.unlockCanvasAndPost(c);
                    }
                } catch(Exception e) {
                    e.printStackTrace();
                }
            }
        }
    };

然后我通过GestureDetector来改变dX和dY的值从而达到移动多张图片的目的，但是移动时会有小的缝隙，停下时缝隙又不见了，如何解决谢谢！