Playlist already added song prevention & AndroidSlidingUpPanel repo U…

app/src/main/java/com/kabouzeid/gramophone/dialogs/AddToPlaylistDialog.java

@@ -5,6 +5,7 @@
 import androidx.annotation.NonNull;
 import androidx.fragment.app.DialogFragment;
 
+import android.widget.Toast;
 import com.afollestad.materialdialogs.MaterialDialog;
 import com.kabouzeid.gramophone.R;
 import com.kabouzeid.gramophone.loader.PlaylistLoader;
@@ -57,9 +58,32 @@ public Dialog onCreateDialog(Bundle savedInstanceState) {
                         CreatePlaylistDialog.create(songs).show(getActivity().getSupportFragmentManager(), "ADD_TO_PLAYLIST");
                     } else {
                         materialDialog.dismiss();
-                        PlaylistsUtil.addToPlaylist(getActivity(), songs, playlists.get(i - 1).id, true);
+                        ArrayList<Song> updatedSongs = getNotExistingSongs(songs,  playlists.get(i - 1).id);
+                        if (updatedSongs.size() > 0 ){
+                            PlaylistsUtil.addToPlaylist(getActivity(), updatedSongs,  playlists.get(i - 1).id, true);
+                        }else {
+                            Toast.makeText(getActivity(), " Inserted "+updatedSongs.size()+" songs ins to the Playlist", Toast.LENGTH_SHORT).show();
+                        }
                     }
                 })
                 .build();
     }
+
+    /**
+     * getNotExistingSongs helps get rid of songs that already exxist in a playlist,
+     * returns a list of songs
+     * @param songs list of songs to be added to playlist
+     * @param playlistId playlist Id
+     */
+    private ArrayList<Song> getNotExistingSongs(ArrayList<Song> songs, int playlistId ){
+        ArrayList<Song> newSongsList = new ArrayList<>();
+        if (songs.size()>0){
+            for (Song song : songs){
+                if (!PlaylistsUtil.doPlaylistContains(getActivity(), playlistId, song.id)){
+                    newSongsList.add(song);
+                }
+            }
+        }
+        return newSongsList;
+    }
 }