Android：每小时获取 UsageStats

Question

我用的是Android的UsageStats特征，但是最小区间是DAILY INTERVAL。

long time = System.currentTimeMillis();
List<UsageStats> appList = manager.queryUsageStats(UsageStatsManager.INTERVAL_DAILY, time - DAY_IN_MILLI_SECONDS, time);

我怎样才能以每小时的间隔获得 UsageStats？

Answer 1

是的，Android 提供最低 INTERVAL_DAILY。但为了获得最佳结果，您可以使用 INTERVAL_BEST。 Android 正在为 queryUsageStats(int, long, long) 中的给定时间范围提供最佳间隔计时器。

编码愉快...

Answer 2

我认为这不可能，即使您在间隔中间请求数据，看起来数据存储在桶中并且最小桶是一天。在 UsageStatsManager 文档中，它说：

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

此外，INTERVAL_BEST 不是真正的时间间隔，它只是选择给定时间范围内的可用时间间隔之一。在 UsageStatsManager.java源代码，它说：

/**
 * The number of available intervals. Does not include {@link #INTERVAL_BEST}, since it
 * is a pseudo interval (it actually selects a real interval).
 * {@hide}
 */
public static final int INTERVAL_COUNT = 4;

Answer 3

所有功劳归于 this answer。我从那个那里学到了。

我们如何收集自定义时间范围内的应用程序使用数据（例如，每 1 小时）？

我们必须调用 queryEvents(long begin_time, long end_time) method as it will provide us all data starting from begin_time to end_time. It give us each app data through foreground and background events instead of total spent time like queryUsageStats() 方法。所以，使用前台和后台事件时间戳，我们可以统计一个应用程序的启动次数，也可以找出每个应用程序的使用时长。

实现收集最后 1 小时的应用程序使用数据

首先，在AndroidManifest.xml文件中添加以下行，同时请求用户获得使用权限。

<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" />

在任何方法中添加以下行

    long hour_in_mil = 1000*60*60; // In Milliseconds
    long end_time = System.currentTimeMillis();
    long start_time = end_time - hour_in_mil;

然后，调用方法getUsageStatistics()

    getUsageStatistics(start_time, end_time);

getUsageStatistics 方法

@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
void getUsageStatistics(long start_time, long end_time) {

    UsageEvents.Event currentEvent;
  //  List<UsageEvents.Event> allEvents = new ArrayList<>();
    HashMap<String, AppUsageInfo> map = new HashMap<>();
    HashMap<String, List<UsageEvents.Event>> sameEvents = new HashMap<>();

    UsageStatsManager mUsageStatsManager = (UsageStatsManager)
            context.getSystemService(Context.USAGE_STATS_SERVICE);

    if (mUsageStatsManager != null) {
        // Get all apps data from starting time to end time
        UsageEvents usageEvents = mUsageStatsManager.queryEvents(start_time, end_time);

        // Put these data into the map
        while (usageEvents.hasNextEvent()) {
            currentEvent = new UsageEvents.Event();
            usageEvents.getNextEvent(currentEvent);
            if (currentEvent.getEventType() == UsageEvents.Event.ACTIVITY_RESUMED ||
                    currentEvent.getEventType() == UsageEvents.Event.ACTIVITY_PAUSED) {
              //  allEvents.add(currentEvent);
                String key = currentEvent.getPackageName();
                if (map.get(key) == null) {
                    map.put(key, new AppUsageInfo(key));
                    sameEvents.put(key,new ArrayList<UsageEvents.Event>());
                }
                sameEvents.get(key).add(currentEvent);
            }
        }

        // Traverse through each app data which is grouped together and count launch, calculate duration
        for (Map.Entry<String,List<UsageEvents.Event>> entry : sameEvents.entrySet()) {
            int totalEvents = entry.getValue().size();
            if (totalEvents > 1) {
                for (int i = 0; i < totalEvents - 1; i++) {
                    UsageEvents.Event E0 = entry.getValue().get(i);
                    UsageEvents.Event E1 = entry.getValue().get(i + 1);

                    if (E1.getEventType() == 1 || E0.getEventType() == 1) {
                        map.get(E1.getPackageName()).launchCount++;
                    }

                    if (E0.getEventType() == 1 && E1.getEventType() == 2) {
                        long diff = E1.getTimeStamp() - E0.getTimeStamp();
                        map.get(E0.getPackageName()).timeInForeground += diff;
                    }
                }
            }

    // If First eventtype is ACTIVITY_PAUSED then added the difference of start_time and Event occuring time because the application is already running.
            if (entry.getValue().get(0).getEventType() == 2) {
                long diff = entry.getValue().get(0).getTimeStamp() - start_time;
                map.get(entry.getValue().get(0).getPackageName()).timeInForeground += diff;
            }
            
    // If Last eventtype is ACTIVITY_RESUMED then added the difference of end_time and Event occuring time because the application is still running .
            if (entry.getValue().get(totalEvents - 1).getEventType() == 1) {
                long diff = end_time - entry.getValue().get(totalEvents - 1).getTimeStamp();
                map.get(entry.getValue().get(totalEvents - 1).getPackageName()).timeInForeground += diff;
            }
        }
    
    smallInfoList = new ArrayList<>(map.values());

    // Concatenating data to show in a text view. You may do according to your requirement
    for (AppUsageInfo appUsageInfo : smallInfoList)
    {
        // Do according to your requirement
        strMsg = strMsg.concat(appUsageInfo.packageName + " : " + appUsageInfo.launchCount + "\n\n");
    }

    TextView tvMsg = findViewById(R.id.MA_TvMsg);
    tvMsg.setText(strMsg);
       
    } else {
        Toast.makeText(context, "Sorry...", Toast.LENGTH_SHORT).show();
    }

}

AppUsageInfo.class

import android.graphics.drawable.Drawable;

class AppUsageInfo {
    Drawable appIcon; // You may add get this usage data also, if you wish.
    String appName, packageName;
    long timeInForeground;
    int launchCount;

    AppUsageInfo(String pName) {
        this.packageName=pName;
    }
}

如何自定义这些代码以收集每 1 小时的数据？

如要获取每小时数据，请更改每小时数据的end_time和start_time值。例如：如果我尝试收集过去每小时的数据（对于过去 2 小时的数据）。 我会做以下事情。

    long end_time = System.currentTimeMillis();
    long start_time = end_time - (1000*60*60);

    getUsageStatistics(start_time, end_time);

    end_time =  start_time;
    start_time = start_time - hour_in_mil;

    getUsageStatistics(start_time, end_time);

但是，您可以使用Handler 跳过重复写入start_time 和end_time 来更改这些变量的值。每次采集一小时数据，完成一个任务，自动改变变量值后，再次调用getUsageStatistics方法

注意：也许，您将无法检索过去 7.5 天以上的数据，因为 events are only kept by the system for a few days。

Answer 4

    Calendar cal = (Calendar) Calendar.getInstance().clone();
    //I used this and it worked, only for 7 days and a half ago 
    if (daysAgo == 0) {
        //Today - I only count from 00h00m00s today to present

        end = cal.getTimeInMillis();
        start = LocalDate.now().toDateTimeAtStartOfDay().toInstant().getMillis();
    } else {
        long todayStartOfDayTimeStamp = LocalDate.now().toDateTimeAtStartOfDay().toInstant().getMillis();
        if (mDaysAgo == -6) {
            //6 days ago, only get events in time -7 days to -7.5 days

            cal.setTimeInMillis(System.currentTimeMillis());
            cal.add(Calendar.DATE, daysAgo + 1);
            end = cal .getTimeInMillis();
            start = end - 43200000;
        } else {
            //get events from 00h00m00s to  23h59m59s
            //Current calendar point to 0h0m today
            cal.setTimeInMillis(todayStartOfDayTimeStamp);
            cal.add(Calendar.DATE, daysAgo + 1);
            end = calendar.getTimeInMillis();
            cal.add(Calendar.DATE, -1);
            start = calendar.getTimeInMillis();
        }
    }

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