Have no ability to get limited items list through LiveData

[georgiscoolman]

I can use find() to get limited items count from query
public List<T> find(final long offset, final long limit)

But unfortunately there is no ability to do the same with LiveData, as it creates based on Query
public ObjectBoxLiveData(Query<T> query)

And in case of huge data it can be performance problem.

[greenrobot-team]

Adding a Query build step is the likely way to go, closing in favor of #303. -ut

[ajans]

I have the same problem.

Isn't it possible and feasible to use Android Jetpack Paging with the ObjectBoxDataSource.Factory to get a LiveData-instance that supports limited items query, as described here?

https://docs.objectbox.io/android/paging-architecture-components

So, you could do something like this (but you have to integrate Android Jetpack Paging for this to work):

public class NotePagedViewModel extends ViewModel {
    
    private LiveData<PagedList<Note>> noteLiveDataPaged;
    
    public LiveData<PagedList<Note>> getNoteLiveDataPaged(Box<Note> notesBox) {
        if (noteLiveDataPaged == null) {
            // query all notes, sorted a-z by their text
            Query<Note> query = notesBox.query().order(Note_.text).build();
            // build LiveData
            noteLiveDataPaged = new LivePagedListBuilder<>(
                    new ObjectBoxDataSource.Factory<>(query),
                    20 /* page size */
            ).build();
        }
        return noteLiveDataPaged;
    }
}

(copied from above-mentioned objectbox-docs-page)