queryUsageStats 间隔持续时间

Question

我正在使用 UsageStatsManager API 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，一切正常。但是如果我想查看过去 2 或 3 小时的数据，我会得到今天一整天的数据。我试过使用日历和 System.currentTimeMillis() 但没有给我过滤结果。

日历方法：

Calendar startCalendar = Calendar.getInstance();
startCalendar.add(Calendar.HOUR_OF_DAY, -2);

Calendar endCalendar = Calendar.getInstance();

并将其传递给 queryUsageStats 方法，如下所示：

usageList = usm.queryUsageStats(interval, startCalendar.getTimeInMillis(), endCalendar.getTimeInMillis());

其中区间为 INTERVAL_BEST.

System.currentTimeMillis() 方法：

long startTime = System.currentTimeMillis() - 7200*1000 // 7200 seconds i.e. 2 hrs

long endTime = System.currentTimeMillis();

像上面一样将其传递给 queryUsageStats :

usageList = usm.queryUsageStats(interval, startTime, endTime);

间隔又是INTERVAL_BEST。

我想知道是否可以获取此持续时间（即不到一天）的数据，因为 INTERVAL_BEST 尚未正确记录以包含此信息。任何帮助将不胜感激，因为我遇到了这个问题。

Answer 1

正如 UsageStatsManager 医生所说：

A request for data in the middle of a time interval will include that interval.

使用情况数据似乎存储在桶中，最小桶是一天，所以您无法查询小于一天的时间段的使用情况统计信息。即使您查询某一天的一小时间隔，也会返回一整天的使用情况统计信息。

Answer 2

晚会有点晚了，但我认为这对某些人可能有用。

您可以使用 UsageStatsManager 中的 queryEvents(long startTime, long endTime) 来获得所需的结果。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 class 将是：

public class AppUsageInfo {

    public long timeInForeground;
    public int launchCount;

    AppUsageInfo() {
        this.timeInForeground = 0;
        this.launchCount = 0;
    }
}

然后要获取过去两个小时的使用情况统计信息，只需调用

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();

queryUsageStats 间隔持续时间

queryUsageStats interval duration

android

usagestatsmanager