android - 如何获取像这样的 UsageStats 数据并像这样查看？

Question

*我得到一些这样的数据*

UsageStatsManager usageStatsManager = (UsageStatsManager) this.getSystemService("usagestats");

    Calendar calendar = Calendar.getInstance();
    calendar.add(Calendar.DAY_OF_MONTH, -1);
    long start = calendar.getTimeInMillis();
    long end = System.currentTimeMillis();
    List<UsageStats> stats = usageStatsManager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, start, end);
    //Map<String,UsageStats> stats =usageStatsManager.queryAndAggregateUsageStats( start,  end);



    for (int i = 0; i < stats.size() ; i++)
    {
        Log.e(TAG,"<<<<"+i+">>>>"+"--------------------------------------------------------------------------");
        Log.e(TAG,"Package Name =  "+stats.get(i).getPackageName());
        printt("First Time Stamp =  ",stats.get(i).getFirstTimeStamp());
        printt("Last Time Stamp =  ",stats.get(i).getLastTimeStamp());
        printt("Last Time Used =  ",stats.get(i).getLastTimeUsed());
        printt("Total Time Used in foreground =  ",stats.get(i).getTotalTimeInForeground());

    }

但是我如何计算和显示这样的以及如何从这些可用数据中获取应用程序的开始时间和结束时间