阅读两个日期之间的日历事件答案

【问题标题】：Read calendar events between 2 dates阅读两个日期之间的日历事件
【发布时间】：2020-04-04 07:17:31
【问题描述】：

我正在尝试读取两个日期之间的日历事件。

我使用 Google 开发者示例 (https://developer.android.com/guide/topics/providers/calendar-provider)，但它不起作用。

当然，我在要求的日期有活动。

如果我阅读日历的所有事件，它正在工作，那么一个（不好的）解决方案是检查每个返回的事件是否包含在间隔中......

这是我的代码：

    final String[] EVENT_PROJECTION = new String[]{
        CalendarContract.Events._ID,
        CalendarContract.Events.TITLE,
        CalendarContract.Events.DTSTART,
        CalendarContract.Events.DTEND,
    };

    final int PROJECTION_ID_INDEX = 0;
    final int PROJECTION_TITLE_INDEX = 1;
    final int PROJECTION_DTSTART_INDEX = 2;
    final int PROJECTION_DTEND_INDEX = 3;

    Calendar beginTime = Calendar.getInstance();
    beginTime.set(2020, 3, 18, 0, 0);
    long startMillis = beginTime.getTimeInMillis();
    Calendar endTime = Calendar.getInstance();
    endTime.set(2020, 3, 24, 0, 0);
    long endMillis = endTime.getTimeInMillis();

    Uri.Builder builder = CalendarContract.Instances.CONTENT_URI.buildUpon();
    ContentUris.appendId(builder, startMillis);
    ContentUris.appendId(builder, endMillis);

    String selection = CalendarContract.Instances.CALENDAR_ID + " = " + calID;

    if (ActivityCompat.checkSelfPermission(this, permission.READ_CALENDAR) == PackageManager.PERMISSION_GRANTED) {
        ContentResolver cr = getContentResolver();
        Cursor cursor = cr.query(builder.build(), EVENT_PROJECTION, selection, null, null);
        if (cursor != null) {
            while (cursor.moveToNext()) {
                Log.i (TAG, "ID=" + cursor.getLong(PROJECTION_ID_INDEX) + " Title=" + cursor.getString(PROJECTION_TITLE_INDEX));
            }
            cursor.close();
        }
    }

构建器已正确初始化（类似于：“content://com.android.calendar/instances/when/1584486000000/1584918000000”）

下面的代码可以很好地返回日历的所有事件：

Cursor eventCursor = cr.query(CalendarContract.Events.CONTENT_URI, EVENT_PROJECTION, selection, null, null);

我尝试了很多方法，但仍然没有结果......

有人知道为什么会失败吗？

谢谢

【问题讨论】：

标签： java android events calendar

【解决方案1】：

这里是解决方案，不完全是来自 Google 的代码...

final String[] EVENT_PROJECTION = new String[]{
    CalendarContract.Events._ID,
    CalendarContract.Events.TITLE,
    CalendarContract.Events.DTSTART,
    CalendarContract.Events.DTEND,
};

final int PROJECTION_ID_INDEX = 0;
final int PROJECTION_TITLE_INDEX = 1;
final int PROJECTION_DTSTART_INDEX = 2;
final int PROJECTION_DTEND_INDEX = 3;

Calendar beginTime = Calendar.getInstance();
beginTime.set(2020, 3, 18, 0, 0);
long startMillis = beginTime.getTimeInMillis();
Calendar endTime = Calendar.getInstance();
endTime.set(2020, 3, 24, 0, 0);
long endMillis = endTime.getTimeInMillis();

String where = "((dtstart >= " + startMillis + ") AND (dtstart <= " + endMillis + ") AND (calendar_id = " + calID + "))";

if (ActivityCompat.checkSelfPermission(this, permission.READ_CALENDAR) == PackageManager.PERMISSION_GRANTED) {

    ContentResolver cr = getContentResolver();
    Cursor cursor = cr.query(Events.CONTENT_URI, projection, where, null, null);
    if (cursor != null) {
        while (cursor.moveToNext()) {
            Log.i (TAG, "ID=" + cursor.getLong(PROJECTION_ID_INDEX) + " Title=" + cursor.getString(PROJECTION_TITLE_INDEX));
        }
        cursor.close();
    }

}

【讨论】：