Have no ability to get limited items list through LiveData #475

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1. greenrobot-team commented on Jun 18, 2018

   

   greenrobot-team

   on Jun 18, 2018

   Member

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

   closed this as completedon Jun 18, 2018
3. ajans commented on Feb 19, 2021

   

   ajans

   on Feb 19, 2021

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   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)