android bottomsheetdialog viewpager嵌套recyclerview滑动冲突解决

override fun dispatchTouchEvent(ev: MotionEvent?): Boolean {
    
    

        ev?.let {
    
    
            var parent=this.parent
            while (parent !is ViewParent){
    
    
                parent=parent.parent
                if(parent==null){
    
    
                    throw Throwable("can not find viewpager in recyclerview")
                }
            }

            if(ev.action==MotionEvent.ACTION_DOWN) {
    
    
                lastX=ev.x
                lastY=ev.y
            }else if(ev.action==MotionEvent.ACTION_MOVE){
    
    
                //如果是竖向滑动则禁止viewpager拦截,否则继续分发
                if((ev.y-lastY).absoluteValue>=(ev.x-lastX).absoluteValue){
    
    
                    parent.requestDisallowInterceptTouchEvent(true)
                }else{
    
    
                    parent.requestDisallowInterceptTouchEvent(false)
                }
            }else if(ev.action==MotionEvent.ACTION_UP){
    
    
                parent.parent.requestDisallowInterceptTouchEvent(false)
            }
        }

        return super.dispatchTouchEvent(ev)
    }