判断Android应用是否在前台

public static boolean isAppOnForeground(Context context)    {        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        String packageName = context.getPackageName();        List<RecentTaskInfo> appTask = activityManager.getRecentTasks(Integer.MAX_VALUE, 1);        if (appTask == null)        {            return false;        }        if (appTask.get(0).baseIntent.toString().contains(packageName))        {            return true;        }        return false;    }