我正在使用UsageStatsManager API来获取特定时间间隔的使用情况统计信息。如果我使用预定义的间隔,即INTERVAL_DAILY,INTERVAL_WEEKLY,INTERVAL_MONTHLY,INTERVAL_YEARLY,则一切正常。但是,如果我想查看过去2或3个小时的数据,我将获得今天的数据。我尝试过使用Calendars和System.currentTimeMillis(),但是没有给我过滤结果。
日历方法:
Calendar startCalendar = Calendar.getInstance();
startCalendar.add(Calendar.HOUR_OF_DAY, -2);
Calendar endCalendar = Calendar.getInstance();
并将此传递给queryUsageStats方法,如下所示:
usageList = usm.queryUsageStats(interval, startCalendar.getTimeInMillis(), endCalendar.getTimeInMillis());
其中interval是INTERVAL_BEST。
System.currentTimeMillis()方法:
long startTime = System.currentTimeMillis() - 7200*1000 // 7200 seconds i.e. 2 hrs
long endTime = System.currentTimeMillis();
将此传递给queryUsageStats,如上所述:
usageList = usm.queryUsageStats(interval, startTime, endTime);
其中interval再次为INTERVAL_BEST。
我想知道是否有可能在此期间(即不到一天)获取数据,因为尚未正确记录INTERVAL_BEST以包含此信息。任何帮助都会受到赞赏,因为我坚持这个问题。
答案 0 :(得分:2)
正如UsageStatsManager doc所说:
在时间间隔中间的数据请求将包括该间隔。
似乎使用数据存储在存储桶中,最小存储桶是一天,因此您无法在不到一天的时间内查询使用情况统计信息。即使您查询特定日期的一小时间隔,也会返回整天的使用情况统计信息。
答案 1 :(得分:2)
聚会晚了一点,但是我认为这可能对某些人有用。
您可以使用UsageStatsManager中的queryEvents(long startTime, long endTime)
获得所需的结果。该方法可能如下所示(受this post启发):
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public HashMap<String, AppUsageInfo> queryUsageStatistics(Context context, long startTime, long endTime) {
UsageEvents.Event currentEvent;
List<UsageEvents.Event> allEvents = new ArrayList<>();
HashMap<String, AppUsageInfo> map = new HashMap<>();
UsageStatsManager mUsageStatsManager = (UsageStatsManager) context.getSystemService(Context.USAGE_STATS_SERVICE);
assert mUsageStatsManager != null;
// Here we query the events from startTime till endTime.
UsageEvents usageEvents = mUsageStatsManager.queryEvents(startTime, endTime);
// go over all events.
while (usageEvents.hasNextEvent()) {
currentEvent = new UsageEvents.Event();
usageEvents.getNextEvent(currentEvent);
String packageName = currentEvent.getPackageName();
if (currentEvent.getEventType() == UsageEvents.Event.ACTIVITY_RESUMED || currentEvent.getEventType() == UsageEvents.Event.ACTIVITY_PAUSED ||
currentEvent.getEventType() == UsageEvents.Event.ACTIVITY_STOPPED) {
allEvents.add(currentEvent); // an extra event is found, add to all events list.
// taking it into a collection to access by package name
if (!map.containsKey(packageName)) {
map.put(packageName, new AppUsageInfo());
}
}
}
// iterate through all events.
for (int i = 0; i < allEvents.size() - 1; i++) {
UsageEvents.Event event0 = allEvents.get(i);
UsageEvents.Event event1 = allEvents.get(i + 1);
//for launchCount of apps in time range
if (!event0.getPackageName().equals(event1.getPackageName()) && event1.getEventType() == UsageEvents.Event.ACTIVITY_RESUMED) {
// if true, E1 (launch event of an app) app launched
Objects.requireNonNull(map.get(event1.getPackageName())).launchCount++;
}
//for UsageTime of apps in time range
if (event0.getEventType() == UsageEvents.Event.ACTIVITY_RESUMED &&
(event1.getEventType() == UsageEvents.Event.ACTIVITY_PAUSED || event1.getEventType() == UsageEvents.Event.ACTIVITY_STOPPED)
&& event0.getPackageName().equals(event1.getPackageName())) {
long diff = event1.getTimeStamp() - event0.getTimeStamp();
Objects.requireNonNull(map.get(event0.getPackageName())).timeInForeground += diff;
}
}
// and return the map.
return map;
}
AppUsageInfo类为:
public class AppUsageInfo {
public long timeInForeground;
public int launchCount;
AppUsageInfo() {
this.timeInForeground = 0;
this.launchCount = 0;
}
}
要获取最近两个小时的使用情况统计信息,只需致电
Calendar startCalendar = Calendar.getInstance();
startCalendar.add(Calendar.HOUR_OF_DAY, -2);
Calendar endCalendar = Calendar.getInstance();
HashMap<String, AppUsageInfo> result = queryUsageStatistics(context, startCalendar.getTimeInMillis(), endCalendar.getTimeInMillis();