Question

我已经在带有分页调用addOnScrollListner的recyclerview内部实现了一个recyclerview，但是它没有为子recyclerview触发。

这就是我要实现的：

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
            }
        }
    })

}

}

我已经在带有分页调用addOnScrollListner的recyclerview内部实现了一个recyclerview，但是它没有为子recyclerview触发。当到达主recyclerview的最后一个索引时，它将为子recyclerview调用addOnScrollListner。

如何在带有分页功能的recyclerview中调用recyclerview？

Answer 1

我不确定这是否是正确的方法，但是我遇到了类似的问题，并且设法通过以下方式解决了该问题：

我没有检查滚动，但是我正在检查最后一个项目何时绑定：

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，如果应该显示更多项目，我将显示进度，下载更多数据等等。

RecyclerView内部的RecyclerView带有两个RecyclerView的分页

1 个答案: