RecyclerView中的RecyclerView，具有两个RecyclerView的分页

Question

我在recyclerview中实现了一个带有分页功能的回收视图，调用addOnScrollListner，但它没有为子回收视图触发。

下面是我实现的内容：

class NSREActivity : AppCompatActivity() {


private var previousTotal = 0
private var loading = true
private val visibleThreshold = 5
private var firstVisibleItem = 0
private var visibleItemCount = 0
private var totalItemCount = 0

private lateinit var mAdapter: RecyclerGenericKAdapter<HashTags>
private var mList: ArrayList<HashTags> = ArrayList()
private var mChildList: ArrayList<HashTags> = ArrayList()

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_nsre)

    initData()

    //Usage of generic recycler view
    mAdapter = RecyclerGenericKAdapter(mList, R.layout.item_layout, object : RecyclerKallback<HashTags> {
        override fun bindData(model: HashTags, position: Int, itemView: View) {

            val name = itemView.findViewById<TextView>(R.id.mainName)
            val childRv = itemView.findViewById<RecyclerView>(R.id.childRecycler)

             name.text = model.tag

            itemView.setOnClickListener {
                Toast.makeText(this@NSREActivity, model.tag, Toast.LENGTH_SHORT).show()

                setChildAdapter(childRv)

            }
        }
    })

    recyclerMain.layoutManager = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
    recyclerMain.adapter = mAdapter

}

private fun setChildAdapter(child : RecyclerView){

    val adt = RecyclerGenericKAdapter(mChildList, R.layout.item_sample_rv, object : RecyclerKallback<HashTags> {
        override fun bindData(model: HashTags, position: Int, itemView: View) {

            val name = itemView.findViewById<TextView>(R.id.text)
            name.text = model.tag

            itemView.setOnClickListener {
                Toast.makeText(this@NSREActivity, model.tag, Toast.LENGTH_SHORT).show()
            }
        }
    })

    val mLayoutManager = LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false)
    child.layoutManager = mLayoutManager
    child.adapter = adt

    child.addOnScrollListener(object : RecyclerView.OnScrollListener() {

        override fun onScrolled(recyclerView: RecyclerView?, dx: Int, dy: Int) {
            super.onScrolled(recyclerView, dx, dy)

            visibleItemCount = child.childCount
            totalItemCount = mLayoutManager.itemCount
            firstVisibleItem = mLayoutManager.findFirstVisibleItemPosition()

            if (loading) {
                if (totalItemCount > previousTotal) {
                    loading = false
                    previousTotal = totalItemCount
                }
            }
            if (!loading && totalItemCount - visibleItemCount <= firstVisibleItem + visibleThreshold) {
                // End has been reached

                Log.e("Yaeye!", "end called")

                // Do something
                addData()

                loading = true
            }
        }
    })

}

}

我在recyclerview中实现了一个带有分页功能的回收视图，调用addOnScrollListner，但它没有为子回收视图触发。当它达到主回收器视图的最后一个索引时，它将为子回收器视图调用addOnScrollListner。

如何在带有分页的recyclerview内部调用recyclerview？

Answer 1

我不确定这是否是一种合适的方式，但我也遇到了类似的问题，我设法用这种方式解决了它：

我没有检查滚动，但我正在检查最后一项何时被绑定：

class PaginationAdapter : RecyclerView.Adapter<RecyclerView.Holder> {

    var lastItemCreatedHandler: (() -> Unit)? = null

    ...

    override fun onBindViewHolder(holder: RecyclerView.Holder, position: Int) {
        if (position == getItemCount() - 1) {
            lastItemCreatedHandler?.invoke()
        }

        ...
    }

}

然后如果应该有更多的项目，我会显示进度，下载更多的数据，等等。