android - 如何获取重复事件的实时时间？

Question

我使用以下方法获取日历的所有事件:

public Cursor getEventsCursor(Context context) {        
    long curr = System.currentTimeMillis();
    long begin = curr - DateUtils.DAY_IN_MILLIS * 30; // - 30 days
    long end = curr + DateUtils.DAY_IN_MILLIS * 30;   // + 30 days

    Cursor cur = null;
    ContentResolver cr = context.getContentResolver();

    String selection = Events.VISIBLE + "= ?";
    String[] selectionArgs = new String[] {"1"};
    String order = Events.DTSTART + " DESC";

    Uri.Builder builder = Instances.CONTENT_URI.buildUpon();
    ContentUris.appendId(builder, begin);
    ContentUris.appendId(builder, end);

    return cr.query(builder.build(), EVENT_PROJECTION, 
            selection, selectionArgs, order);
} 

它有效，但我得到了所有重复事件的初始时间!

日志

Feeder milestone; eventId: 12;  date=2012-12-06 11:00:00  // initial time
Feeder milestone; eventId: 23;  date=2012-12-06 11:00:00
Feeder milestone; eventId: 178; date=2012-12-06 11:00:00
Feeder milestone; eventId: 180; date=2012-12-06 11:00:00

如何获取重复事件的实时时间？

示例:如果重复事件 Feeder milestone 是 2 周一次的事件，我预计:

Feeder milestone; eventId: 12;  date=2014-08-03 11:00:00
Feeder milestone; eventId: 23;  date=2014-08-27 11:00:00
Feeder milestone; eventId: 178; date=2014-09-11 11:00:00
Feeder milestone; eventId: 180; date=2014-09-25 11:00:00

Answer 1

来自 Calendar Provider documentation , 有 3 个与 Events 相关的东西，其中之一是 Instances。

Events: This table holds the event-specific information. Each row in this table has the information for a single event—for example, event title, location, start time, end time, and so on. The event can occur one-time or can recur multiple times. Attendees, reminders, and extended properties are stored in separate tables. They each have an EVENT_ID that references the _ID in the Events table.

Instances: This table holds the start and end time for each occurrence of an event. Each row in this table represents a single event occurrence. For one-time events there is a 1:1 mapping of instances to events. For recurring events, multiple rows are automatically generated that correspond to multiple occurrences of that event.

_{(强调我的)}

在重复事件的情况下，Events.DTSTART 指的是整个事件的开始时间。

另一方面，Instances.BEGIN 和Instances.END 指的是事件每次发生 的开始和结束时间。

在一般情况下，始终使用Instances.BEGIN 来方便地获取所有事件(无论是否重复发生)的开始时间。