add "Empty queue" option in Queue activity

res/values/translatable.xml

@@ -266,6 +266,7 @@ THE SOFTWARE.
 	<string name="enqueue_current_artist">Enqueue artist</string>
 	<string name="enqueue_current_genre">Enqueue genre</string>
 	<string name="clear_queue">Clear queue</string>
+	<string name="empty_the_queue">Empty queue</string>
 	<string name="show_queue">Show queue</string>
 	<string name="queue">Queue</string>
 	<string name="toggle_controls">Toggle controls</string>

src/ch/blinkenlights/android/vanilla/PlaybackActivity.java

@@ -349,6 +349,7 @@ public abstract class PlaybackActivity extends Activity
 	static final int MENU_SHOW_QUEUE = 13;
 	static final int MENU_SAVE_AS_PLAYLIST = 14;
 	static final int MENU_DELETE = 15;
+	static final int MENU_EMPTY_QUEUE = 16;
 
 	@Override
 	public boolean onCreateOptionsMenu(Menu menu)

src/ch/blinkenlights/android/vanilla/PlaybackService.java

@@ -1637,6 +1637,14 @@ public final class PlaybackService extends Service
 		mTimeline.clearQueue();
 	}
 
+	/**
+	 * Empty the song queue.
+	 */
+	public void emptyQueue()
+	{
+		mTimeline.emptyQueue();
+	}
+
 	/**
 	 * Return the error message set when FLAG_ERROR is set.
 	 */

src/ch/blinkenlights/android/vanilla/ShowQueueActivity.java

@@ -73,6 +73,7 @@ public class ShowQueueActivity extends PlaybackActivity
 	@Override
 	public boolean onCreateOptionsMenu(Menu menu) {
 		menu.add(0, MENU_CLEAR_QUEUE, 0, R.string.clear_queue).setIcon(R.drawable.ic_menu_close_clear_cancel);
+		menu.add(0, MENU_EMPTY_QUEUE, 0, R.string.empty_the_queue);
 		menu.add(0, MENU_SAVE_AS_PLAYLIST, 0, R.string.save_as_playlist).setIcon(R.drawable.ic_menu_preferences);
 		return true;
 	}
@@ -93,6 +94,9 @@ public class ShowQueueActivity extends PlaybackActivity
 				dialog.setOnDismissListener(this);
 				dialog.show();
 				break;
+			case MENU_EMPTY_QUEUE:
+				PlaybackService.get(this).emptyQueue();
+				break;
 			default:
 				return super.onOptionsItemSelected(item);
 		}

src/ch/blinkenlights/android/vanilla/SongTimeline.java

@@ -786,6 +786,23 @@ public final class SongTimeline {
 		changed();
 	}
 
+	/**
+	 * Empty the song queue (clear the whole queue).
+	 */
+	public void emptyQueue()
+	{
+		synchronized (this) {
+			mSongs.clear();
+		}
+
+		if (mCallback != null) {
+			mCallback.activeSongReplaced(+1, getSong(+1));
+			mCallback.positionInfoChanged();
+		}
+
+		changed();
+	}
+
 	/**
 	 * Save the active songs for use with broadcastChangedSongs().
 	 *