Insert an event in to the calendar on device without showing UI.

CalendarUtil.java

//See more on android source directly. https://android.googlesource.com/platform/frameworks/base/+/refs/heads/master/core/java/android/provider/CalendarContract.java

/*
 * Util functions for accessing calendar services of Android. Although the App
 * supports >= 2.3.3, we still show here the low-level URIs for calendar
 * services, so that we can learn and reuse them in other projects.
 * 
 * Inspired by
 * https://android.googlesource.com/platform/frameworks/base/+/refs/heads
 * /master/core/java/android/provider/CalendarContract.java
 * 
 * 
 * There is a non-official method that an Intent could be sent and the Calendar
 * formula(activity) will be opened. The users have to input more information
 * manually. The requirement doesn't want.
 * 
 *  
  				Intent intent = new Intent(Intent.ACTION_EDIT);
				intent.setType("vnd.android.cursor.item/event");
				intent.putExtra("beginTime", start);
				intent.putExtra("allDay", false); 
				intent.putExtra("endTime", end);
				intent.putExtra("title", _title);
				intent.putExtra("description", _description);
				_context.startActivity(intent);
 *  
 *  
 */
public final class CalendarUtil {

	public interface OnAccessingCalanderListener {

		void onPanic();


		void onEnd();
	}

	public interface CalendarObserverCallback {

		void onCalendarRefreshed();
	}


	private final static String CALANDER_URL;
	private final static String CALANDER_EVENT_URL;
	private final static String CALANDER_REMIDER_URL;
	static {
		if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.FROYO) {
			CALANDER_URL = "content://com.android.calendar/calendars";
			CALANDER_EVENT_URL = "content://com.android.calendar/events";
			CALANDER_REMIDER_URL = "content://com.android.calendar/reminders";
		} else {
			CALANDER_URL = "content://calendar/calendars";
			CALANDER_EVENT_URL = "content://calendar/events";
			CALANDER_REMIDER_URL = "content://calendar/reminders";
		}
	}
	private static WeakReference<CalendarObserverCallback> sCalendarObserverCallback;
	private static ContentObserver sContentObserver;
	private static byte[] LOCK = new byte[0];
	private static Cursor sEventCursor;


	private static String getGoogleID(Context _context) {
		String calId = null;
		Cursor userCursor = _context.getContentResolver().query(Uri.parse(CALANDER_URL), null, null, null, null);
		if (userCursor.getCount() > 0) {
			userCursor.moveToFirst();
			calId = userCursor.getString(userCursor.getColumnIndex("_id"));
			return calId;
		}
		return null;
	}


	public static void addEvent(Context _context, int _eventID, String _title, String _description, String _date,
			int _start, int _duration, OnAccessingCalanderListener _onAccessingCalanderListener) {
		String googleID = getGoogleID(_context);
		if (googleID == null) {
			_context.startActivity(new Intent(Settings.ACTION_ADD_ACCOUNT));
			if (_onAccessingCalanderListener != null) {
				_onAccessingCalanderListener.onPanic();
			}
		} else {
			try {
				// Make an event
				ContentValues event = new ContentValues();
				event.put("title", _title);
				event.put("description", _description);
				event.put("calendar_id", googleID);
				Calendar calendar = Calendar.getInstance();
				calendar.setTime(new SimpleDateFormat("dd.MM.yyyy", Locale.getDefault()).parse(_date));
				calendar.set(Calendar.HOUR_OF_DAY, _start);
				long start = calendar.getTime().getTime();
				calendar.set(Calendar.HOUR_OF_DAY, _start + _duration);
				long end = calendar.getTime().getTime();
				event.put("dtstart", start);
				event.put("dtend", end);
				event.put("hasAlarm", 1);
				// http://stackoverflow.com/questions/11868433/error-in-calendar-application-for-insert-events
				event.put("eventTimezone", TimeZone.getDefault().getID());
				// Insert the event
				Uri newEvent = _context.getContentResolver().insert(Uri.parse(CALANDER_EVENT_URL), event);
				long id = Long.parseLong(newEvent.getLastPathSegment());
				ContentValues values = new ContentValues();
				values.put("event_id", id);
				values.put("minutes", 10);
				_context.getContentResolver().insert(Uri.parse(CALANDER_REMIDER_URL), values);
				if (_onAccessingCalanderListener != null) {
					_onAccessingCalanderListener.onEnd();
				}
				// CalendarToast toast = new
				// CalendarToast(_context);toast.show();
				ECEToast.showInstance(_context, ECEToast.ToastType.ADD_EVENT);
			} catch (Exception _e) {
				if (_onAccessingCalanderListener != null) {
					_onAccessingCalanderListener.onPanic();
				}
			}
		}
	}
}