如何使用android Paging 3在某个位置插入项目

implementation "androidx.paging:paging-runtime-ktx:3.0.0"

class MyPagingSource : PagingSource<Int, Item>() {
    override suspend fun load(params: LoadParams<Int>): LoadResult<Int, Item> {
        // 加载数据的逻辑
        // 返回 LoadResult.Page 对象
    }
}

val pager = Pager(PagingConfig(pageSize = 20)) {
    MyPagingSource()
}

val pagingData: LiveData<PagingData<Item>> = pager.flow.asLiveData()

val adapter = MyPagingAdapter()

pagingData.observe(this) { data ->
    adapter.submitData(lifecycle, data)
}

val newItem = Item("New Item")
val currentList = adapter.snapshot().toMutableList()
currentList.add(2, newItem) // 在位置2插入新项目
adapter.submitList(currentList)
adapter.notifyItemInserted(2)