修复权限使用目的提醒bug:用户自主按返回键遮罩层消失，定时器还会执行返回上一层页面，当用户在home页，即栈顶层，则会出现黑屏

@@ -268,7 +268,7 @@ class HomePageState extends State<HomePage> with WidgetsBindingObserver {
       if (widget.initialIndex == 0 ||
           widget.initialIndex == 1 && needRefreshTemp == false) return;
       _initNotification();
-      Future.delayed(Duration(seconds: 5), () {
+      Future.delayed(Duration(minutes: 5), () {
         //30000
         ContactModel.getInstance().uploadLocalContact(context);
         UserModel usermodel = Provider.of<UserModel>(context, listen: false);