android - 关于动态添加view的位置问题

Question

根据gridview的子项点击添加一个button在一个linearlayout中，并且这个button可以移动，但是每次添加之前添加的view的位置就会重置，设置layoutParams的margin又会出现不停的闪的情况

composeMainHoriView.setOnItemClickListener(new MyHorizontalScrollView.OnItemClickListener() {
            @Override
            public void onClick(View view, int pos) {
                final Button button = new Button(context);
                button.setBackgroundResource(drableIdList.get(pos));
                final LinearLayout.LayoutParams llp = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,
                        LinearLayout.LayoutParams.WRAP_CONTENT);
                button.setLayoutParams(llp);
                button.setOnTouchListener(new View.OnTouchListener() {
                    @Override
                    public boolean onTouch(View v, MotionEvent event) {
                        int firstX = 0;
                        int firstY = 0;
                        switch (event.getAction()) {
                            case MotionEvent.ACTION_DOWN:
                                firstX = (int) event.getX();
                                firstY = (int) event.getY();
                                break;
                            case MotionEvent.ACTION_MOVE:
                                int currentX = (int) event.getX() - button.getWidth() / 2;
                                int currentY = (int) event.getY() - button.getHeight() / 2;
                                int x = currentX - firstX;
                                int y = currentY - firstY;
                                button.offsetTopAndBottom(y);
                                button.offsetLeftAndRight(x);
                                break;
                            default:
                                break;
                        }
                        return true;
                    }
                });
                composeMainCenterFl.addView(button);