【安卓笔记】解决ViewPager2嵌套RecyclerView，上下滑动冲突

当ViewPager2嵌套RecyclerView上下滑动的事件会被RecyclerView分发下去到ViewPager2，这样就会造成卡顿。解决办法就是重写RecyclerView的dispatchTouchEvent函数，将上滑事件拦截下来选择不分发给下一层的View自己处理。

Java代码

 // 用于标记滑动的坐标
    private int downX= 0;
    private int downY= 0;
     @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        int x = (int) ev.getX();
        int y = (int) ev.getY();
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN: {
                getParent().requestDisallowInterceptTouchEvent(true);
                break;
            }
            case MotionEvent.ACTION_MOVE: {
                int deltaX = x - downX;
                int deltaY = y - downX;
                //左右滑动
                if (Math.abs(deltaX) > Math.abs(deltaY)) {
                    getParent().requestDisallowInterceptTouchEvent(false);
                }
                break;
            }
            case MotionEvent.ACTION_UP: {
                getParent().requestDisallowInterceptTouchEvent(false);
                break;
            }
        }
        //赋值
        downX= x;
        downX= y;
        return super.dispatchTouchEvent(ev);
    }

kotlin代码

 var downX: Int = 0
 var downY = 0
 override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
        val x = ev.x.toInt()
        val y = ev.y.toInt()
        when (ev.action) {
            MotionEvent.ACTION_DOWN -> {
                //拦截
                parent.requestDisallowInterceptTouchEvent(true)
            }
            MotionEvent.ACTION_MOVE -> {
                val deltaX: Int = x - downX
                val deltaY: Int = y - downX
                if (Math.abs(deltaX) > Math.abs(deltaY)) {
                    parent.requestDisallowInterceptTouchEvent(false)
                }
            }
            MotionEvent.ACTION_UP -> {
                parent.requestDisallowInterceptTouchEvent(false)
            }
        }
        downX= x
        downX= y
        return super.dispatchTouchEvent(ev)
    }

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