Is Application Foreground?

Helper.java

class Helper {
    public static boolean isAppForeground(Context context) {
        KeyguardManager keyguardManager =
            (KeyguardManager) context.getSystemService(KEYGUARD_SERVICE);
        if (keyguardManager.inKeyguardRestrictedInputMode()) {
            return false;
        }

        int myPid = Process.myPid();
        List<RunningAppProcessInfo> runningAppProcesses =
            ((ActivityManager) context.getSystemService(ACTIVITY_SERVICE)).getRunningAppProcesses();
        if (runningAppProcesses == null) {
            return false;
        }

        for (RunningAppProcessInfo runningAppProcessInfo : runningAppProcesses) {
            if (runningAppProcessInfo.pid == myPid) {
                return runningAppProcessInfo.importance == IMPORTANCE_FOREGROUND;
            }
        }

        return false;
    }
}

with some revision the application will be foreground