add packages, receiving & processing

lib/pages/box/box_list.dart

@@ -4,6 +4,7 @@ import 'package:fcs/pages/box/model/box_model.dart';
 import 'package:fcs/pages/widgets/bottom_up_page_route.dart';
 import 'package:fcs/pages/widgets/local_text.dart';
 import 'package:fcs/pages/widgets/progress.dart';
+import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
@@ -38,7 +39,7 @@ class _BoxListState extends State<BoxList> {
             appBar: AppBar(
               centerTitle: true,
               leading: new IconButton(
-                icon: new Icon(Icons.close),
+                icon: new Icon(CupertinoIcons.back),
                 onPressed: () => Navigator.of(context).pop(),
               ),
               backgroundColor: primaryColor,