运行前台服务时如何检测当前的前台应用程序

Question

I'm currently working on an AppLock which includes service that detects current foreground app but the problem is the service keeps returning the AppLock itself as the current foreground app even after I minimize it or close the AppLock. Is there a way to fix this?

I'm aware of other similar questions have been answered but I don't see anyone else having the same problem as me as far as I can see.

Below is the code I'm using to detect the foreground app

public String getForegroundApp() {

    String currentApp = "NULL";
    UsageStatsManager usm = (UsageStatsManager) this.getSystemService(Context.USAGE_STATS_SERVICE);
    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) this.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> tasks = am.getRunningAppProcesses();
        currentApp = tasks.get(0).processName;
    }

    return currentApp;
}

public int onStartCommand(Intent intent, int flags, int startId) {
    if(foreapp.equals(lockedApp)){
        Intent intentp3=new Intent(getApplicationContext(), PasswordPage3.class);
        intentp3.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intentp3);
    }
    return START_STICKY;
}

The receiver I'm using to start the service:

public class RestartReceiver extends BroadcastReceiver{
    @Override
    public void onReceive(Context context, Intent lol) {
        Log.i("running in the back","restarting");

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            context.startForegroundService(new Intent(context, MyService.class));
        } else {
            context.startService(new Intent(context, MyService.class));
        }
    }
}

Note: foreapp and lockedApp are both String variables

The String that currentApp returns are constantly com.example.apptest3 which is the package name that I'm working on.

Answer 1

您无法获得自Android L以来的顶级活动，但是有一种使用ActivityManager.RunningAppProcessInfo的变通办法，它很重要 ，它可以让用户启动应用程序，请查看以下先前的答案 。

Answer 2

The problem is no more. I solved the problem using the answer provided by Tarun Sharma in one of the previous questions, if anyone is facing the same problem as me, go here .