如何检查app是否在服务前台？

public static boolean isAppForeground(Context context) {
    ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningAppProcessInfo> processInfos = manager.getRunningAppProcesses();
    if (processInfos != null && !processInfos.isEmpty()) {
        for (ActivityManager.RunningAppProcessInfo processInfo : processInfos) {
            if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                if (processInfo.processName.equals(context.getPackageName())) {
                    return true;
                }
            }
        }
    }
    return false;
}

public class AppLifecycleTracker implements Application.ActivityLifecycleCallbacks {
    private int resumedCount = 0;

    @Override
    public void onActivityCreated(Activity activity, Bundle savedInstanceState) {
    }

    @Override
    public void onActivityStarted(Activity activity) {
        if (resumedCount == 0) {
            // 应用从后台切换到前台
        }
        resumedCount++;
    }

    @Override
    public void onActivityResumed(Activity activity) {
    }

    @Override
    public void onActivityPaused(Activity activity) {
    }

    @Override
    public void onActivityStopped(Activity activity) {
        resumedCount--;
        if (resumedCount == 0) {
            // 应用从前台切换到后台
        }
    }

    @Override
    public void onActivitySaveInstanceState(Activity activity, Bundle outState) {
    }

    @Override
    public void onActivityDestroyed(Activity activity) {
    }
}