Use LocalBroadcast to finish RingtoneActivity from other components

app/src/main/java/com/philliphsu/clock2/editalarm/EditAlarmActivity.java

@@ -30,6 +30,7 @@ import com.philliphsu.clock2.SharedPreferencesHelper;
 import com.philliphsu.clock2.model.AlarmsRepository;
 import com.philliphsu.clock2.ringtone.RingtoneActivity;
 import com.philliphsu.clock2.util.AlarmUtils;
+import com.philliphsu.clock2.util.LocalBroadcastHelper;
 
 import java.util.Date;
 
@@ -435,9 +436,7 @@ public class EditAlarmActivity extends BaseActivity implements AlarmNumpad.KeyLi
     public void cancelAlarm(Alarm alarm, boolean showToast) {
         AlarmUtils.cancelAlarm(this, alarm, showToast);
         if (RingtoneActivity.isAlive()) {
-            Intent intent = new Intent(this, RingtoneActivity.class)
-                    .setAction(RingtoneActivity.ACTION_UNBIND);
-            startActivity(intent);
+            LocalBroadcastHelper.sendBroadcast(this, RingtoneActivity.ACTION_FINISH);
         }
     }