我试图从UsageStats
查询UsageStatsManager
。
我已经建立了一个DateUtils
课程,为我提供了获取每天/每月/每年(一周即将到来)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();
}
我使用这些长篇查询UsageStats
不同日期:
mUsageStats = mUsageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, startTime, endTime);
我今天可以获取数据,但前几天会返回一个空列表。
这是我用来获取数据的原因:
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中是否存在限制,导致我无法获取较旧的数据或我做错了什么?
答案 0 :(得分:0)
通过使用queryAndAggregateUsageStats()
方法(正确的毫秒数),您可以从任意日期(在here范围内)获取使用情况统计信息,如下所示:
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());
}