可以加上下拉刷新和上滑加载的功能吗
时间: 2023-10-04 21:13:53 浏览: 96
当然可以,这里是一个 Kotlin RecyclerView 多列表嵌套的实现示例代码,包含了下拉刷新和上滑加载的功能:
```kotlin
class ParentAdapter(
private val dataList: MutableList<ParentData>,
private val onRefresh: () -> Unit,
private val onLoadMore: () -> Unit
) :
RecyclerView.Adapter<ParentAdapter.ViewHolder>(), SwipeRefreshLayout.OnRefreshListener {
private var isRefreshing = false
private var isLoadingMore = false
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val itemView = LayoutInflater.from(parent.context)
.inflate(R.layout.item_parent, parent, false)
return ViewHolder(itemView)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val parentData = dataList[position]
holder.bind(parentData)
if (position == dataList.size - 1 && !isLoadingMore) {
isLoadingMore = true
onLoadMore()
}
}
override fun getItemCount() = dataList.size
override fun onRefresh() {
if (!isRefreshing) {
isRefreshing = true
onRefresh()
}
}
fun setRefreshing(isRefreshing: Boolean) {
this.isRefreshing = isRefreshing
}
fun setLoadingMore(isLoadingMore: Boolean) {
this.isLoadingMore = isLoadingMore
}
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
private val childRecyclerView: RecyclerView = itemView.findViewById(R.id.childRecyclerView)
private val swipeRefreshLayout: SwipeRefreshLayout = itemView.findViewById(R.id.swipeRefreshLayout)
fun bind(parentData: ParentData) {
val childAdapter = ChildAdapter(parentData.childList)
childRecyclerView.adapter = childAdapter
childRecyclerView.layoutManager = LinearLayoutManager(itemView.context)
swipeRefreshLayout.setOnRefreshListener(this@ParentAdapter)
swipeRefreshLayout.isRefreshing = isRefreshing
}
}
}
```
在 `ParentAdapter` 中,增加了下拉刷新和上滑加载的回调函数。在 `ViewHolder` 中,添加了 `SwipeRefreshLayout`,并在 `bind` 方法中设置上拉刷新的状态。同时,当列表滑动到最后一个项时,调用 `onLoadMore` 函数,表示需要加载更多数据。在 `onRefresh` 方法中,设置下拉刷新的状态,调用 `onRefresh` 函数,表示需要刷新数据。在 `setRefreshing` 和 `setLoadingMore` 方法中,设置下拉刷新和上滑加载的状态。
下面是 `ChildAdapter` 的代码,其中增加了一个 `loadMoreTextView`,用于显示上滑加载的状态:
```kotlin
class ChildAdapter(private val dataList: List<ChildData>) :
RecyclerView.Adapter<ChildAdapter.ViewHolder>() {
private var isLoadingMore = false
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val itemView = LayoutInflater.from(parent.context)
.inflate(R.layout.item_child, parent, false)
return ViewHolder(itemView)
}
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val childData = dataList[position]
holder.bind(childData)
if (position == dataList.size - 1 && !isLoadingMore) {
isLoadingMore = true
holder.showLoadingMore()
}
}
override fun getItemCount() = dataList.size
inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
private val titleTextView: TextView = itemView.findViewById(R.id.titleTextView)
private val loadMoreTextView: TextView = itemView.findViewById(R.id.loadMoreTextView)
fun bind(childData: ChildData) {
titleTextView.text = childData.title
itemView.setOnClickListener {
// 处理子列表项点击事件
}
}
fun showLoadingMore() {
loadMoreTextView.visibility = View.VISIBLE
}
}
}
```
在 `ChildAdapter` 中,增加了一个 `isLoadingMore` 变量,用于记录是否正在上滑加载。在 `onBindViewHolder` 方法中,当滑动到最后一个列表项时,调用 `showLoadingMore` 方法,表示需要显示上滑加载的状态。在 `ViewHolder` 中,增加了一个 `loadMoreTextView`,用于显示上滑加载的状态。
以上代码仅作为 Kotlin RecyclerView 多列表嵌套的实现示例,具体实现应根据实际需求进行调整。
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