这种情况通常发生在Recyclerview滚动到新数据时尝试更新Recyclerview的UI元素。
首先可以检查是否在数据源中为Recyclerview提供了正确的数据,然后确保在Recyclerview中的布局管理器、适配器和滚动监听器中的代码都正确。还要确保在更新UI元素之前进行空值检查。
以下是一种可能的解决方案,其中包含一个带有滚动监听器的Recyclerview的代码示例,这个监听器使用DiffUtil类在接收到新数据时自动更新Recyclerview的UI元素:
class MainActivity : AppCompatActivity() {
private var adapter: MyAdapter? = null
private var layoutManager: LinearLayoutManager? = null
private var recyclerView: RecyclerView? = null
private var data: MutableList? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
data = mutableListOf()
adapter = MyAdapter(data!!)
layoutManager = LinearLayoutManager(this)
recyclerView = findViewById(R.id.recyclerView)
recyclerView!!.layoutManager = layoutManager
recyclerView!!.adapter = adapter
recyclerView!!.addOnScrollListener(object : RecyclerView.OnScrollListener() {
override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
super.onScrolled(recyclerView, dx, dy)
val visibleItemCount = layoutManager!!.childCount
val totalItemCount = layoutManager!!.itemCount
val firstVisibleItemPosition = layoutManager!!.findFirstVisibleItemPosition()
if ((visibleItemCount + firstVisibleItemPosition) >= totalItemCount && firstVisibleItemPosition >= 0) {
// Reach here when user scrolls to the end of the list
// Add new data to existing list and update UI
val newData = getNewData()
val diffResult = DiffUtil.calculateDiff(MyDiffCallback(adapter!!.data, newData))
adapter!!.data.addAll(newData)
diffResult.dispatchUpdatesTo(adapter!!)
}
}
})
}
private fun getNewData(): List {
// TODO: Code to get new