Android UsageStatsManager产生错误的输出？

Question

我正在使用此链接生成应用程序使用状态.我对所选间隔的理解是,对于YEARLY间隔,它会YEAR为每个包之间beginTime和endTime持续时间聚合每个数据.同样,它应该工作WEEKLY和DAILY间隔.

有了WEEKLY,我的代码和输出如下;

码:

Calendar beginCal = Calendar.getInstance();
beginCal.set(Calendar.DATE, 1);
beginCal.set(Calendar.MONTH, 0);
beginCal.set(Calendar.YEAR, 2012);

Calendar endCall = Calendar.getInstance();
endCall.set(Calendar.DATE, 1);
endCall.set(Calendar.MONTH, 0);
endCall.set(Calendar.YEAR, 2016);

final List<UsageStats> queryUsagesStats= mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_WEEKLY, beginCal.getTimeInMillis(), endCall.getTimeInMillis());    

for(UsageStats us: queryUsagesStats)
{
    long beginTime = us.getFirstTimeStamp();
    String beginDate = df.format(new Date(beginTime));


    long endTime = us.getLastTimeStamp();
    String endDate = df.format(new Date(endTime));
    String lastTime = df.format(new Date(us.getLastTimeUsed()));
    long totalTimeInForeground = us.getTotalTimeInForeground()/1000L;
    System.out.println("Pkg = " + us.getPackageName() + ", beginTime " + beginDate + ", endTime= " + endDate + ", lastTime = " + lastTime + ", totalTime = " + totalTimeInForeground);
}

输出:

Pkg = com.example.newappusagestatistics, beginTime 05/20/2015 17:00:04, endTime= 05/21/2015 17:55:42, lastTime = 05/21/2015 17:55:42, totalTime = 11186
Pkg = com.android.launcher, beginTime 05/20/2015 17:00:04, endTime= 05/21/2015 17:55:42, lastTime = 05/21/2015 17:55:42, totalTime = 1091
Pkg = com.android.browser, beginTime 05/20/2015 17:00:04, endTime= 05/21/2015 17:15:27, lastTime = 05/21/2015 17:15:27, totalTime = 68
Pkg = com.android.sdksetup, beginTime 05/20/2015 17:00:04, endTime= 01/01/1970 15:59:55, lastTime = 05/21/2015 14:41:08, totalTime = 1194
Pkg = com.android.camera, beginTime 05/20/2015 17:00:04, endTime= 01/01/1970 15:59:55, lastTime = 05/21/2015 14:55:32, totalTime = 40
Pkg = com.android.settings, beginTime 05/20/2015 17:00:04, endTime= 01/01/1970 15:59:55, lastTime = 05/21/2015 16:15:19, totalTime = 97
Pkg = com.android.systemui, beginTime 05/20/2015 17:00:04, endTime= 01/01/1970 15:59:55, lastTime = 05/21/2015 14:47:45, totalTime = 

但是,如果我使用INTERVAL.DAILY上面的代码,我只得到前三行.我的间隔足够大,它应该包含此间隔之间所有包的所有数据.

Pkg = com.example.newappusagestatistics, beginTime 05/21/2015 17:00:00, endTime= 05/21/2015 17:59:18, lastTime = 05/21/2015 17:59:18, totalTime = 3484
Pkg = com.android.launcher, beginTime 05/21/2015 17:00:00, endTime= 05/21/2015 17:59:18, lastTime = 05/21/2015 17:59:18, totalTime = 27
Pkg = com.android.browser, beginTime 05/21/2015 17:00:00, endTime= 05/21/2015 17:15:27, lastTime = 05/21/2015 17:15:27, totalTime = 43

我做错了什么或者我对聚合间隔的理解不正确吗？任何帮助,将不胜感激.谢谢.

EDIT1

在/ data/system/usagestats文件夹中查看statsfile android存储库后,我发现每日统计信息有两个文件,每周统计信息一个,如下所示.

每日文件1

<usagestats version="1" endTime="59366071">
<packages>
<package lastTimeActive="59366071" package="com.example.newappusagestatistics" timeActive="4064908" lastEvent="1"/>
<package lastTimeActive="59366020" package="com.android.launcher" timeActive="813728" lastEvent="2"/>
<package lastTimeActive="927475" package="com.android.browser" timeActive="43838" lastEvent="2"/>
</packages>

每日文件2

<usagestats version="1" endTime="86395657">
    <packages>
        <package lastTimeActive="86395657" package="com.example.newappusagestatistics" timeActive="7916365" lastEvent="3" />
        <package lastTimeActive="85743386" package="com.android.launcher" timeActive="1064651" lastEvent="2" />
        <package lastTimeActive="78961499" package="com.android.browser" timeActive="24715" lastEvent="2" />
        <package lastTimeActive="78063875" package="com.android.sdksetup" timeActive="1194161" lastEvent="3" />
        <package lastTimeActive="78928555" package="com.android.camera" timeActive="40775" lastEvent="2" />
        <package lastTimeActive="83715390" package="com.android.settings" timeActive="97012" lastEvent="2" />
        <package lastTimeActive="78461328" package="com.android.systemui" timeActive="4162" lastEvent="2" />
    </packages>

每周

<usagestats version="1" endTime="145761729">
    <packages>
        <package lastTimeActive="145761729" package="com.example.newappusagestatistics" timeActive="11981273" lastEvent="1" />
        <package lastTimeActive="145761678" package="com.android.launcher" timeActive="1878379" lastEvent="2" />
        <package lastTimeActive="87323133" package="com.android.browser" timeActive="68553" lastEvent="2" />
        <package lastTimeActive="78063875" package="com.android.sdksetup" timeActive="1194161" lastEvent="3" />
        <package lastTimeActive="78928555" package="com.android.camera" timeActive="40775" lastEvent="2" />
        <package lastTimeActive="83715390" package="com.android.settings" timeActive="97012" lastEvent="2" />
        <package lastTimeActive="78461328" package="com.android.systemui" timeActive="4162" lastEvent="2" />
    </packages>

整个数据似乎搞砸了.对于相同的浏览器应用,每日存储不同的结果和每周商店不同.

Answer 1

根据谷歌发布文档.

(https://developer.android.com/about/versions/android-5.0.html#System)

系统基于每个应用程序收集使用情况数据,以每日,每周,每月和每年的间隔汇总数据.系统保留此数据的最长持续时间如下:

每日数据:7天

每周数据:4周

每月数据:6个月

年度数据:2年

如果您想获得超过7天7天的统计数据,请将时间间隔从INTERVAL_DAILY更改为INTERVAL_WEEKLY或INTERVAL_YEARLY.这里有更多相同的细节.

https://developer.android.com/reference/android/app/usage/UsageStatsManager.html

Answer 2

大概是乱了。您不能相信 queryUsageStats 的结果。

就我而言，调用

queryUsageStats(UsageStatsManager.INTERVAL_DAILY, 0, today) 

显示过去 7 天的结果并调用

queryUsageStats(UsageStatsManager.INTERVAL_DAILY, few-days-ago, today) 

只显示今天的结果。几天前和今天是指定日期的时间（以毫秒为单位）。检查今天的结果显示，缺少某个应用程序的使用，而今天晚些时候使用的其他应用程序却存在。