SessionDetailActivityOnStop.java

@Override
public void onStop() {
    super.onStop();
    if (mInitStarred != mStarred) {
        if (UIUtils.getCurrentTime(this) < mSessionStart) {
            // Update Calendar event through the Calendar API on Android 4.0 or new versions.
            Intent intent = null;
            if (mStarred) {
                // Set up intent to add session to Calendar, if it doesn't exist already.
                intent = new Intent(SessionCalendarService.ACTION_ADD_SESSION_CALENDAR,
                        mSessionUri);
                intent.putExtra(SessionCalendarService.EXTRA_SESSION_START,
                        mSessionStart);
                intent.putExtra(SessionCalendarService.EXTRA_SESSION_END,
                        mSessionEnd);
                intent.putExtra(SessionCalendarService.EXTRA_SESSION_ROOM, mRoomName);
                intent.putExtra(SessionCalendarService.EXTRA_SESSION_TITLE, mTitleString);
            } else {
                // Set up intent to remove session from Calendar, if exists.
                intent = new Intent(SessionCalendarService.ACTION_REMOVE_SESSION_CALENDAR,
                        mSessionUri);
                intent.putExtra(SessionCalendarService.EXTRA_SESSION_START,
                        mSessionStart);
                intent.putExtra(SessionCalendarService.EXTRA_SESSION_END,
                        mSessionEnd);
                intent.putExtra(SessionCalendarService.EXTRA_SESSION_TITLE, mTitleString);
            }
            intent.setClass(this, SessionCalendarService.class);
            startService(intent);

            if (mStarred) {
                setupNotification();
            }
        }
    }
}