Android architecture components paging DataSource.Factory error

Special

New Member
#1
I'm trying to make my DataSource.Factory class, but I get an error when trying to return my PageKeyedDataSource implementation.
Mã:
class SubredditPageKeyedDataSource(private val service: LedditService,
                               private val subredditName: String): PageKeyedDataSource<String, Children<DataX>>() {

@SuppressLint("CheckResult")
override fun loadInitial(params: LoadInitialParams<String>, callback: LoadInitialCallback<String, Children<DataX>>) {
    service.getSubredditTopics(subredditName).subscribe { result -> callback.onResult(result.data.children, result.data.before, result.data.after) }
}

@SuppressLint("CheckResult")
override fun loadAfter(params: LoadParams<String>, callback: LoadCallback<String, Children<DataX>>) {
    service.getSubredditTopicsAfter(subredditName, after = params.key).subscribe {result -> callback.onResult(result.data.children, result.data.after)}
}

override fun loadBefore(params: LoadParams<String>, callback: LoadCallback<String, Children<DataX>>) {
    // ignored, since we only ever append to our initial load
}
}
Now heres my factory:
Mã:
class SubredditDataSourceFactory(private val service: LedditService,
                             private val subredditName: String): DataSource.Factory<String, List<Children<DataX>>>() {


override fun create(): DataSource<String, List<Children<DataX>>> {
    return SubredditPageKeyedDataSource(service, subredditName)
    }
}
When returning my DataSource in the above create() method, AndroidStudio gives me an IDE error:
Mã:
Type mismatch.
Required: DataSource<String, List<Children<DataX>>>
Found: SubredditPageKeyedDataSource
Am I going insane? PageKeyedDataSource extends from ContiguousDataSource which is a DataSource. Why am I getting a type mismatch? I've checked 2 different examples of the paging library and their implementation is exactly like mine. Unless I missed something???
 

Admin

Administrator
Thành viên BQT
#2
The types don't actually match.

Your factory is for:

Mã:
PageKeyedDataSource<String, List<Children<DataX>>>
But your datasource implements the type:
Mã:
PageKeyedDataSource<String, Children<DataX>>
Notice that one has a list of children on the right side, the other a single child. The one without the List<> should be correct, try removing that part from your code.
 

Từ khóa phổ biến

You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.

Top