anchor.diff:  import 'package:flutter/material.dart';
   import 'package:gsy_github_app_flutter/common/dao/ReposDao.dart';
  +import 'package:gsy_github_app_flutter/common/net/Address.dart';
   import 'package:gsy_github_app_flutter/common/style/GSYStyle.dart';
  +import 'package:gsy_github_app_flutter/widget/GSYCommonOptionWidget.dart';
   import 'package:gsy_github_app_flutter/widget/GSYMarkdownWidget.dart';
  +import 'package:gsy_github_app_flutter/widget/GSYTitleBar.dart';
   
   /**
    * 文件代码详情
  
positive.code: 
    @override
    Widget build(BuildContext context) {
      Widget widget = (data == null)
          ? new Center(
              child: new Container(
  
negative.code: 
      return new Scaffold(
        appBar: new AppBar(
          title:  GSYTitleBar(
            title,
            rightWidget: new GSYCommonOptionWidget(url),
            needRightLocalIcon: false,
          ),
        ),
        body: widget,
  