拖动view之MarginParam实现

这里演示的是不修改父布局，也不导致父布局的其他子控件发生变化的实现方案，

    int clickDistance = DensityUtil.dip2px(AppContext.getInstance(), 3);

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
//                        pressTime = System.currentTimeMillis();
                        hasMove = false;
                        downX = event.getX();
                        downY = event.getY();
                        return true;
                    case MotionEvent.ACTION_MOVE:
                        float moveX = event.getX();
                        float moveY = event.getY();

                        hasMove = true;
                        View root = binding.getRoot();



                        float distanceX =event.getX()-downX;//表示触摸到哪里，但是 你滑动具体是多少是得转换的
                        float distanceY =event.getY()- downY;

                        int leftSrc = v.getLeft();
                        int rightSrc = v.getRight();
                        int topSrc = v.getTop();
                        int bottomSrc = v.getBottom();


                        int left = (int) (root.getLeft() + distanceX);
                        int right = (int) (root.getRight() + distanceX);
                        int top = (int) (root.getTop() + distanceY);
                        int bottom = (int) (root.getBottom() + distanceY);

                        if (BuildConfig.DEBUG) {
                            Prt.w(TAG, String.format("滑动距离%f y:%f src left %d,top%d right %d bottom%d modify left %d,top%d right %d bottom%d", distanceX, distanceY, leftSrc, topSrc, rightSrc, bottomSrc, left, top, right, bottom));
                        }
                        downX = event.getX();
                        downY = event.getY();
                        ViewGroup.MarginLayoutParams layoutParams = (ViewGroup.MarginLayoutParams) root.getLayoutParams();
                        layoutParams.leftMargin= layoutParams.leftMargin+(int) distanceX;
                        layoutParams.bottomMargin= layoutParams.topMargin+(int) distanceY;
     root.setLayoutParams(layoutParams);
                        return true;


                     /*   } else {
                            return false;
                        }*/


//                        offsetLeftAndRight(offX);
//                        offsetTopAndBottom(offY);

                    case MotionEvent.ACTION_UP:
                        if (hasMove) {
                            return true;

                        } else {
                            return false;
                        }
                    default:
                        return false;
                }

存在的问题

发生了抖动问题，如何解决请关注我 第二篇文章

https://blog.csdn.net/robert_cysy/article/details/73656428