automaticallyImplyLeading:

这将检查我们是否想在应用程序栏上应用back小部件(leading小部件)。 如果automcallyimplyleading为false，则自动将空格赋给标题，如果引导小部件为true，则此参数无效。

void main() {
  runApp(
    new MaterialApp(
      home: new Scaffold(
        appBar: AppBar(
          automaticallyImplyLeading: false, // Used for removing back buttoon. 
          title: new Center(
            child: new Text("Demo App"),
          ),
        ),
        body: new Container(
          child: new Center(
            child: Text("Hello world!"),
          ),
        ),
      ),
    ),
  );
}  

AppBar小部件有一个名为automcallyimplyleading的属性。默认情况下，它的值为true。如果你不想让颤振自动构建后退按钮，然后只需使属性为假。

appBar: AppBar(
  title: Text("YOUR_APPBAR_TITLE"), 
  automaticallyImplyLeading: false,
),

添加自定义后退按钮

appBar: AppBar(
  title: Text("YOUR_APPBAR_TITLE"), 
  automaticallyImplyLeading: false,
  leading: YOUR_CUSTOM_WIDGET(),
),

如果导航到另一个页面。可以使用Navigator.pushReplacement()。如果你从登录导航到主屏幕，它可以被使用。或者你可以用。 AppBar (automaticallyImplyLeading: false)

我认为解决办法如下

你实际上可以:

Don't want to display that ugly back button ( :] ), and thus go for : AppBar(...,automaticallyImplyLeading: false,...); Don't want the user to go back - replacing current view - and thus go for: Navigator.pushReplacementNamed(## your routename here ##); Don't want the user to go back - replacing a certain view back in the stack - and thus use: Navigator.pushNamedAndRemoveUntil(## your routename here ##, f(Route<dynamic>)→bool); where f is a function returning truewhen meeting the last view you want to keep in the stack (right before the new one); Don't want the user to go back - EVER - emptying completely the navigator stack with: Navigator.pushNamedAndRemoveUntil(context, ## your routename here ##, (_) => false);

使用这个条子AppBar

SliverAppBar (
        automaticallyImplyLeading: false,
        elevation: 0,
        brightness: Brightness.light,
        backgroundColor: Colors.white,
        pinned: true,
      ),

使用这个正常的Appbar

 appBar: AppBar(
    title: Text
    ("You decide on the appbar name"
    style: TextStyle(color: Colors.black,), 
    elevation: 0,
    brightness: Brightness.light,
    backgroundColor: Colors.white,
    automaticallyImplyLeading: false,

),

您可以通过传递一个空的新Container()作为AppBar的前导参数来删除返回按钮。

如果你发现自己这样做了，你可能不希望用户能够按下设备的后退按钮回到之前的路线。与其调用pushNamed，不如尝试调用Navigator。pushReplacementNamed将导致先前的路由消失。

函数pushReplacementNamed将删除后堆栈中的先前路由，并用新路由替换它。

后者的完整代码示例如下。

import 'package:flutter/material.dart';

class LogoutPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("Logout Page"),
      ),
      body: new Center(
        child: new Text('You have been logged out'),
      ),
    );
  }

}
class MyHomePage extends StatelessWidget {

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("Remove Back Button"),
      ),
      floatingActionButton: new FloatingActionButton(
        child: new Icon(Icons.fullscreen_exit),
        onPressed: () {
          Navigator.pushReplacementNamed(context, "/logout");
        },
      ),
    );
  }
}

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      home: new MyHomePage(),
      routes: {
        "/logout": (_) => new LogoutPage(),
      },
    );
  }
}