Implemented preference for starred-sync support

app/src/main/java/com/cappielloantonio/play/viewmodel/StarredSyncViewModel.java

@@ -0,0 +1,35 @@
+package com.cappielloantonio.play.viewmodel;
+
+import android.app.Application;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LifecycleOwner;
+import androidx.lifecycle.LiveData;
+import androidx.lifecycle.MutableLiveData;
+
+import com.cappielloantonio.play.model.Playlist;
+import com.cappielloantonio.play.model.Song;
+import com.cappielloantonio.play.repository.PlaylistRepository;
+import com.cappielloantonio.play.repository.SongRepository;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class StarredSyncViewModel extends AndroidViewModel {
+    private final SongRepository songRepository;
+
+    private final MutableLiveData<List<Song>> starredTracks = new MutableLiveData<>(null);
+
+    public StarredSyncViewModel(@NonNull Application application) {
+        super(application);
+
+        songRepository = new SongRepository(application);
+    }
+
+    public LiveData<List<Song>> getStarredTracks(LifecycleOwner owner) {
+        songRepository.getStarredSongs(false, -1).observe(owner, starredTracks::postValue);
+        return starredTracks;
+    }
+}