我尝试了所有我认为应该工作的一切，为什么绘图线不遵循我的触摸坐标？它不准确

Question

请参阅下面的视频，以下是我当前的代码：

increate 方法：

       rootLayout = findViewById(R.id.relativemain);

此方法是我将GIF图像作为芯片的地方，我也需要帮助进入这个，因为当我添加 addrule 以更改芯片的位置时，事实证明我无法再拖动它：

private void mvb_chip(ImageView view, int a) {
    view = rootLayout.findViewById(a);
    RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(300, 300);
    view.setLayoutParams(layoutParams);
    view.setVisibility(View.VISIBLE);
    view.setOnTouchListener(new mvb_direct.ChoiceTouchListener());

}

最后是触摸侦听器来拖动芯片！在动作内部。 A/28489989/19026761 ，我的问题是为什么绘图线与我的触摸x和y并不完全相似，请参见下面的视频

float startX;
float startY;
private final class ChoiceTouchListener implements View.OnTouchListener {
    @Override
    public boolean onTouch(View view, MotionEvent event) {
        final int X = (int) event.getRawX();
        final int Y = (int) event.getRawY();


        switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
                RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
                _xDelta = X - lParams.leftMargin;
                _yDelta = Y - lParams.topMargin;

                startX = event.getX();
                startY = event.getY();



                break;
            case MotionEvent.ACTION_UP:
                Paint paint = new Paint();
                paint.setColor(Color.CYAN);
                paint.setAntiAlias(true);
                paint.setDither(true);
                paint.setStyle(Paint.Style.STROKE);
                paint.setStrokeJoin(Paint.Join.ROUND);
                paint.setStrokeCap(Paint.Cap.ROUND);
                paint.setStrokeWidth(5);

                drawbleView.getCanvas().drawLine(startX,startY,event.getRawX(),event.getRawY(),paint);
                drawbleView.invalidate();
                break;



            case MotionEvent.ACTION_POINTER_DOWN:

            case MotionEvent.ACTION_POINTER_UP:
                break;
            case MotionEvent.ACTION_MOVE:
                RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
                layoutParams.leftMargin = X - _xDelta;
                layoutParams.topMargin = Y - _yDelta;
                layoutParams.rightMargin = -250;
                layoutParams.bottomMargin = -250

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