1. Single RecyclerView：简单模式
【利用RecyclerView.OnScrollListener监听滑动位置，吸顶View被 ViewHolder和Activity复用】

2. Double RecyclerView：RecyclerView嵌套RecyclerView
【事件分发，吸顶View是个单独ViewHolder,无须做其他处理】

3. Viewpager RecyclerView:RecyclerView嵌套ViewPager(其中包含的页面内容是RecyclerView)
【事件分发，吸顶View是个单独ViewHolder,无须做其他处理】

4. 拓展View需要调用ParentRecyclerView接口OnFlingListener,并实现OnChildFlingListener
 【拓展View支持下拉刷新parent.onScrollBottom(false),支持联动onChildFling(speed: Int)】

implementation 'com.uis:adsorbent:0.5.7
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation "com.android.support:recyclerview-v7:$supportVer"

/** true 开启滑动冲突处理(默认true)*/
recyclerView.enableConflict = true
/** 开启快速滚动parent带动child联动效果(默认false)*/
recyclerView.enableParentChain = false
/** 开启快速滚动child带动parent联动效果(默认true)*/
recyclerView.enableChildChain = true
/** 开启child下拉刷新(默认false)*/
recyclerView.enableChildSwipeRefresh = true

recyclerView.addOnScrollListener(object : SingleAdsorbentListener(){
        /** 获取被吸顶ViewGroup*/
        override fun getUiViewGroup(): ViewGroup = relative
        /** 获取吸顶View*/
        override fun getPinView(): View = pin
        /** 获取吸顶View在RecyclerView中的位置*/
        override fun getPinViewPosition(): Int = 15
        /** 吸顶的时候 true:停止滚动并定位在吸顶位置,false:可以继续fling*/
        override fun stopWhenAdsorbent(): Boolean = false
    })

//recyclerView is ParentRecyclerView
manager = LinearLayoutManager(this)
recyclerView.layoutManager = manager
recyclerView.adapter = adapter

//itemView.recyclerview is ChildRecyclerView as ViewHolder
init {
    val p = itemView.recyclerview.layoutParams
    /** 吸顶高+child recyclerView高 = recyclerView高*/
    val height = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 50f, parent.resources.displayMetrics) + 0.5f
    p.height = parent.measuredHeight - height.toInt()
    itemView.recyclerview.layoutParams = p

    val adapter = DemoGroupAdapter()
    for(i in 0 until 50) {
        adapter.addEntity(GroupEntity(VT_TXT, "Child RecyclerView item $i"))
    }
    val recycler = itemView.recyclerview
    recycler.layoutManager = LinearLayoutManager(parent.context)
    recycler.adapter = adapter
}

//recyclerView is ParentRecyclerView
manager = LinearLayoutManager(this)
recyclerView.layoutManager = manager
recyclerView.adapter = adapter

//ViewPager as ViewHolder,ChildRecycler is ViewPager Item
    override fun instantiateItem(container: ViewGroup, position: Int): Any {
    var view :RecyclerView? = null
    while(views.size > 0 && view == null){
        view = views.removeLast()
    }
    if(view == null){
        view = ChildRecyclerView(container.context)
        view.layoutManager = LinearLayoutManager(container.context)
    }
    if(view.adapter == null){
        val adapter = DemoGroupAdapter()
        for(i in 0 until 50) {
            adapter.addEntity(GroupEntity(VT_TXT, "ViewPager嵌套RecyclerView item $i"))
        }
        view.adapter = adapter
    }
    container.addView(view)
    return view
}