无法在Android Lollipop 5.0中获取前台活动名称

Question

我使用以下代码在变量foregroundTaskPackageName中获取前台应用程序的活动名称.它适用于4.1到4.4之间的所有操作系统版本,但在Android 5.0 Lollipop中不起作用.

任何人都可以帮助5.0 Lollipop中的变化吗？在Lollipop中 - 我为foregroundTaskPackageName获取的文本只是'Launcher3'.我正在使用Genymotion仿真器.

ActivityManager am = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
RunningTaskInfo foregroundTaskInfo = am.getRunningTasks(1).get(0); // get
                                                                        // list
                                                                        // of
                                                                        // running
                                                                        // tasks
String foregroundTaskAppName = null;
String foregroundTaskPackageName = foregroundTaskInfo.topActivity
                .getPackageName();

Answer 1

这对Lollipop(21)有用:

    ActivityManager manager = (ActivityManager)mContext.getSystemService(Context.ACTIVITY_SERVICE);

    List<ActivityManager.RunningAppProcessInfo> tasks = manager.getRunningAppProcesses();

    Log.i("current_app",tasks.get(0).processName);

Answer 2

您需要使用new UsageStatsManager并调用其queryUsageStats方法来获取已启动的活动的历史记录.请注意,用户需要在Security-> Apps上使用访问权限访问设备设置.

链接:

UsageStatsManager 文件

queryUsageStats 方法文档

Answer 3

您可以使用下面的代码并获取当前的前台活动包名称.

 if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP) {
        // intentionally using string value as Context.USAGE_STATS_SERVICE was
        // strangely only added in API 22 (LOLLIPOP_MR1)
        @SuppressWarnings("WrongConstant")
        UsageStatsManager usm = (UsageStatsManager) getSystemService("usagestats");
        long time = System.currentTimeMillis();
        List<UsageStats> appList = usm.queryUsageStats(UsageStatsManager.INTERVAL_DAILY,
                        time - 1000 * 1000, time);
                if (appList != null && appList.size() > 0) {
                    SortedMap<Long, UsageStats> mySortedMap = new TreeMap<Long, UsageStats>();
                    for (UsageStats usageStats : appList) {
                        mySortedMap.put(usageStats.getLastTimeUsed(),
                                usageStats);
                    }
                    if (mySortedMap != null && !mySortedMap.isEmpty()) {
                        currentApp = mySortedMap.get(
                                mySortedMap.lastKey()).getPackageName();
                    }
                }
    } else {
        ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> tasks = am
                        .getRunningAppProcesses();
                currentApp = tasks.get(0).processName;
    }

将这些权限添加到Manifest文件中(第一个用于<API 21,第二个用于> = API 21).

<uses-permission android:name="android.permission.GET_TASKS" />
<uses-permission android:name="android.permission.PACKAGE_USAGE_STATS" tools:ignore="ProtectedPermissions" />