Android UsageStatsManager是否仅返回上一天/周/月/年的数据？

我正试图从

usagestastsmanager

查询

usagestasts

。 我构建了一个

DateUtils

类，该类为我提供了获取每天/月/年（即将到来的一周）的开始和结束时间的方法，如下所示：

public static Calendar getCal(int year, int month, int day) {
    Calendar cal = Calendar.getInstance();
    cal.set(year, month, day, 0, 0, 0);
    cal.set(Calendar.MILLISECOND, 0);
    return cal;
}

public static long getDayStart(int year, int month, int day) {
    return getCal(year, month, day).getTimeInMillis();
}

public static long getDayEnd(int year, int month, int day) {
    Calendar cal = getCal(year, month, day);
    cal.add(Calendar.DATE, 1);
    return cal.getTimeInMillis();
}

UsageStatsManager mUsageStatsManager = (UsageStatsManager) getSystemService(Context.USAGE_STATS_SERVICE);
if(mUsageStatsManager != null){
    Calendar beginCal = Calendar.getInstance();
    beginCal.add(Calendar.DATE, -1); // get yesterdays data
    Calendar  endCal = Calendar.getInstance();

    Map<String, UsageStats> queryUsageStats = mUsageStatsManager.queryAndAggregateUsageStats(beginCal.getTimeInMillis(), endCal.getTimeInMillis());
}

我使用这些long查询不同日期的

UsageStats

：

 mUsageStats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, startTime, endTime);

我可以获取今天的数据，但前几天将返回一个空列表

这是我用来获取数据的方法：

12 nov 2014, with type UsageStatsManager.INTERVAL_DAILY
startTime: 1415746800000
endTime: 1415833200000
mUsageStats size: 18

11 nov 2014, with type UsageStatsManager.INTERVAL_DAILY
startTime: 1415660400000
endTime: 1415746800000
mUsageStats size: 0

---

API中是否存在阻止我获取旧数据的限制，或者我是否做错了什么？

您可以使用

queryandagregateusagestats（）

方法从任意日期（在设置的范围内）获取使用情况统计数据，正确的毫秒如下所示：

public static Calendar getCal(int year, int month, int day) {
    Calendar cal = Calendar.getInstance();
    cal.set(year, month, day, 0, 0, 0);
    cal.set(Calendar.MILLISECOND, 0);
    return cal;
}

public static long getDayStart(int year, int month, int day) {
    return getCal(year, month, day).getTimeInMillis();
}

public static long getDayEnd(int year, int month, int day) {
    Calendar cal = getCal(year, month, day);
    cal.add(Calendar.DATE, 1);
    return cal.getTimeInMillis();
}

UsageStatsManager mUsageStatsManager = (UsageStatsManager) getSystemService(Context.USAGE_STATS_SERVICE);
if(mUsageStatsManager != null){
    Calendar beginCal = Calendar.getInstance();
    beginCal.add(Calendar.DATE, -1); // get yesterdays data
    Calendar  endCal = Calendar.getInstance();

    Map<String, UsageStats> queryUsageStats = mUsageStatsManager.queryAndAggregateUsageStats(beginCal.getTimeInMillis(), endCal.getTimeInMillis());
}

usagestastsmanager mUsageStatsManager=（usagestastsmanager）getSystemService（Context.USAGE\u STATS\u SERVICE）；
if（mUsageStatsManager！=null）{
Calendar beginCal=Calendar.getInstance（）；
添加（Calendar.DATE，-1）；//获取昨天的数据
Calendar endCal=Calendar.getInstance（）；
Map queryUsageStats=mUsageStatsManager.queryandagregateusagestats（beginCal.getTimeInMillis（），endCal.getTimeInMillis（））；
}

您找到解决方案了吗？没有，API似乎很有限。