Playlist interface - initial work

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

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+package com.cappielloantonio.play.viewmodel;
+
+import android.app.Application;
+
+import androidx.annotation.NonNull;
+import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
+
+import com.cappielloantonio.play.model.Album;
+import com.cappielloantonio.play.model.Playlist;
+import com.cappielloantonio.play.model.Song;
+import com.cappielloantonio.play.repository.SongRepository;
+
+import java.util.List;
+
+public class PlaylistPageViewModel extends AndroidViewModel {
+    private SongRepository songRepository;
+
+    private LiveData<List<Song>> songList;
+
+    private Playlist playlist;
+
+    public PlaylistPageViewModel(@NonNull Application application) {
+        super(application);
+
+        songRepository = new SongRepository(application);
+    }
+
+    public LiveData<List<Song>> getPlaylistSongList() {
+        // Prendere le canzoni di ciascuna playlist
+        songList = songRepository.getAlbumListLiveSong(playlist.getId());
+        return songList;
+    }
+
+    public Playlist getPlaylist() {
+        return playlist;
+    }
+
+    public void setPlaylist(Playlist playlist) {
+        this.playlist = playlist;
+    }
+}