我模仿了codelab，实现了getRefreshKey()方法，但是由于params.loadSize是3*PAGE_SIZE在刷新之后（也就是删除一个item或者编辑一个item），所以我的recyclerview大概率不会回到原来的位置。我应该怎么办？这是我的寻呼源：
class PasswordPagingSource2(
val type: String,
val service: PasswordService,
val PAGE_SIZE:Int) :
PagingSource<Int, Any>() {
private val PAGE_INDEX = 0
override suspend fun load(params: LoadParams<Int>): LoadResult<Int, Any> {
val page = params.key ?: PAGE_INDEX
return try {
val list =
service.getPasswords(
"{\"type\":\"$type\"}",
params.loadSize, page * PAGE_SIZE).items
val preKey = if (page > 0) page - 1 else null
val nextKey = if (list.isNotEmpty()) page + (params.loadSize/PAGE_SIZE)else null
return LoadResult.Page(data =list, prevKey = preKey, nextKey = nextKey)
} catch (exception: IOException) {
return LoadResult.Error(Throwable("IO Error"))
} catch (exception: HttpException) {
return LoadResult.Error(Throwable("Network Error"))
}
}
override fun getRefreshKey(state: PagingState<Int, Any>): Int? {
val page = state.anchorPosition?.let { anchorPosition->
state.closestPageToPosition(anchorPosition)?.prevKey?.plus(1)
?:state.closestPageToPosition(anchorPosition)?.nextKey?.minus(1)
}
return page
}
}