新的5.0.x UsageStats定期重置

Question

因此我们开始每小时收集使用情况统计信息，使用Interval_Daily

询问最后一小时

queryUsageStats(UsageStatsManager.INTERVAL_DAILY, startTime, timeNow);

其中timeNow每小时递增一次，并且总是提前一小时。

问题：

1. 当用户在夜晚进入睡眠状态时，queryStats为空。这不是很糟糕，因为用户什么都不做
2. 更重要的是，Usagestats有时会重置：

来自

[{"start_time":"2015-01-14T13:12:00.154-0800"},
{"app_package":"com.hipchat","app_time_in_foreground":886341,"app_launches":5}

到

[{"start_time":"2015-01-14T14:11:49.814-0800"},
{"app_package":"com.hipchat","app_time_in_foreground":48851,"app_launches":3}

1. 使用情况统计信息在重置之前是累积的

[{"start_time":"2015-01-14T09:12:00.242-0800"},
{"app_package":"com.hipchat","app_time_in_foreground":230317,"app_launches":11}

[{"start_time":"2015-01-14T10:11:37.839-0800"},
{"app_package":"com.hipchat","app_time_in_foreground":712018,"app_launches":24}

[{"start_time":"2015-01-14T11:11:50.694-0800"},
{"app_package":"com.hipchat","app_time_in_foreground":792177,"app_launches":6}

[{"start_time":"2015-01-14T12:11:49.643-0800"},
{"app_package":"com.hipchat","app_time_in_foreground":815998,"app_launches":3}

[{"start_time":"2015-01-14T13:12:00.154-0800"},
{"app_package":"com.hipchat","app_time_in_foreground":886341,"app_launches":5}

然而，通过查看＆＃34; app_launches＆＃34;

，似乎UsageEvents不是累积的。

有人可以澄清一切吗？