fix build error

Author: Yang-Xijie

README.md

@@ -4,11 +4,17 @@ A Flutter app for mobile.
 
 ## Usage
 
+### Chrome (portrait mode)
+
 1. Long press `Chrome` icon on your phone desktop and click `App info`. In `Permissions > Settings`, enable `Home screen shortcuts`.
 1. Open <https://ex-studio.github.io/OfflineMahjongIndicator/#/> in `Chrome`.
 1. Open menu button from the top right corner and click `Install app`.
 1. Wait a moment and you can open the app from your desktop.
 
+### Mobile Phone App
+
+
+
 ## Development
 
 ```

lib/App/context.dart

@@ -1,8 +1,8 @@
 // [Widgets]
 import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
-import 'package:offlinemahjongindicator/App/More/help_button.dart';
-import 'package:offlinemahjongindicator/App/More/info_button.dart';
+import 'package:offlinemahjongindicator/App/help_button.dart';
+import 'package:offlinemahjongindicator/App/info_button.dart';
 import 'package:offlinemahjongindicator/Widgets/my.dart';
 // [Views]
 // [Data]
@@ -11,7 +11,6 @@ import 'package:offlinemahjongindicator/Models/my.dart';
 import 'package:offlinemahjongindicator/Constants/my.dart';
 // [Auxiliary]
 import 'package:offlinemahjongindicator/Extensions/my.dart';
-
 // ----------------
 
 class ContextView extends StatelessWidget {