Get a list of installed calendar in an Android device is relatively easy. This involves using the ContentResolver to query the installed calendars and get a handle to the Cursor for the same. Loop through the cursor to get the id and name for the Calendars.
	Cursor cursor;

			if (android.os.Build.VERSION.SDK_INT <= 7) {
				cursor = getContentResolver().query(Uri.parse("content://calendar/calendars"), new String[] { "_id", "displayName" }, null,
						null, null);

			}

			else if (android.os.Build.VERSION.SDK_INT <= 14) {
				cursor = getContentResolver().query(Uri.parse("content://com.android.calendar/calendars"),
						new String[] { "_id", "displayName" }, null, null, null);

			}

			else {
				cursor = getContentResolver().query(Uri.parse("content://com.android.calendar/calendars"),
						new String[] { "_id", "calendar_displayName" }, null, null, null);

			}

			// Get calendars name
			Log.i("Cursor count " + cursor.getCount());
			if (cursor.getCount() > 0) {
				cursor.moveToFirst();
				String[] calendarNames = new String[cursor.getCount()];
				// Get calendars id
				int calendarIds[] = new int[cursor.getCount()];
				for (int i = 0; i < cursor.getCount(); i++) {
					calendarIds[i] = cursor.getInt(0);
					calendarNames[i] = cursor.getString(1);
					Log.i("Calendar Name : " + calendarNames[i]);
					cursor.moveToNext();
				}
			} else {
				Log.e("No calendar found in the device");
			}