从 google 日历中删除自​​己的活动

Question

我构建了一个允许将应用程序特定数据与 google 日历同步的应用程序。

要将我的活动添加到日历，我有以下方法，效果很好。

private static void addCalendarEvents(Context context, Cursor c) {
        if (c.moveToFirst()) {
            if (ActivityCompat.checkSelfPermission(context, Manifest.permission.WRITE_CALENDAR) == PackageManager.PERMISSION_GRANTED) {

                while (!c.isAfterLast() && !c.isBeforeFirst()) {
                    ContentResolver cr = context.getContentResolver();
                    ContentValues values = new ContentValues();

                    values.put(CalendarContract.Events.DTSTART, start);
                    values.put(CalendarContract.Events.DTEND, end);
                    values.put(CalendarContract.Events.TITLE, title);
                    values.put(CalendarContract.Events.DESCRIPTION, description);
                    values.put(CalendarContract.Events.EVENT_TIMEZONE, TimeZone.getDefault().getID());
                    values.put(CalendarContract.Events.CALENDAR_ID, 1);
                    values.put(CalendarContract.Events.HAS_ALARM, false);

                    Uri uri = cr.insert(CalendarContract.Events.CONTENT_URI, values);

                    c.moveToNext();
                }
            }
        }
    }

添加的事件在 google 日历应用程序中可见。我的问题是，我还希望能够再次从日历中删除（和更新）我的活动。 我怎样才能做到这一点？我只找到了从日历中删除所有事件的解决方案。

我必须创建自己的日历吗？我怎样才能自动让这个日历与 google 日历同步？或者我是否必须保存我添加的所有事件 ID？

Answer 1

我决定将 calendarEventIds 作为附加列保存在我的数据库中，如下所示，这很有用：

private static void addCalendarEvents(Context context, Cursor c) {
    if (c.moveToFirst()) {
        if (ActivityCompat.checkSelfPermission(context, Manifest.permission.WRITE_CALENDAR) == PackageManager.PERMISSION_GRANTED) {

            while (!c.isAfterLast() && !c.isBeforeFirst()) {
                ContentResolver cr = context.getContentResolver();
                ContentValues values = new ContentValues();

                values.put(CalendarContract.Events.DTSTART, start);
                values.put(CalendarContract.Events.DTEND, end);
                values.put(CalendarContract.Events.TITLE, title);
                values.put(CalendarContract.Events.DESCRIPTION, description);
                values.put(CalendarContract.Events.EVENT_TIMEZONE, TimeZone.getDefault().getID());
                values.put(CalendarContract.Events.CALENDAR_ID, 1);
                values.put(CalendarContract.Events.HAS_ALARM, false);

                long eventID;
                // The row has an event id, so the event should be updated not created
                if ((eventID = c.getLong(c.getColumnIndex(LessonDatabaseManagement.KEY_CALENDAR_EVENT_ID))) != -1) {
                    Uri eventUri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID);
                    cr.update(eventUri, values, null, null);
                } else {
                // The row hasn't an event id, so the event should be created
                    Uri uri = cr.insert(CalendarContract.Events.CONTENT_URI, values);
                    eventID = Long.parseLong(uri.getLastPathSegment());
                    new LessonDatabaseManagement(this)
                            .updateCalendarEventId(c.getInt(c.getColumnIndex(LessonDatabaseManagement.KEY_ID)), eventID);
                }

                c.moveToNext();
            }
        }
    }
}

要删除：

private void removeCalendarEvents() {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_CALENDAR) == PackageManager.PERMISSION_GRANTED) {
        Cursor c = new LessonDatabaseManagement(this).getAllCalendarEventIds();

        if (c.moveToFirst()) {

            while (!c.isAfterLast() && !c.isBeforeFirst()) {
                long eventID;
                if ((eventID = c.getLong(c.getColumnIndex(LessonDatabaseManagement.KEY_CALENDAR_EVENT_ID))) != -1) {
                    Uri eventUri = ContentUris.withAppendedId(CalendarContract.Events.CONTENT_URI, eventID);
                    this.getContentResolver().delete(eventUri, null, null);
                }

                c.moveToNext();
            }
        }

        new LessonDatabaseManagement(this).removeAllCalendarEventIds();
    }
}