blocks|key|5042958|text|您可以通过将一个空的new+Container()作为leading参数传递给您的AppBar来删除back按钮。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5042959|如果您发现自己这样做，您可能不希望用户能够按下设备的后退按钮返回到以前的路线。不要调用pushNamed，而是尝试调用Navigator.pushReplacementNamed以导致早期路由消失。|5042960|函数pushReplacementNamed将移除后堆栈中的前一个路由，并将其替换为新路由。|5042961|后者的完整代码示例如下所示。|5042962|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(),
++++++},
++++);
++}
}|code-block|syntax|javascript|5042963|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.flutter.io/flutter/material/AppBar/leading.html|1|https://docs.flutter.io/flutter/material/AppBar-class.html|2|https://docs.flutter.io/flutter/widgets/Navigator/pushReplacementNamed.html^0|A|F|R|7|15|6|R|7|0|15|6|1|0|17|9|1N|U|1N|U|2|0|2|K|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]|$9|17|A|18|B|C]]|D|@$9|19|A|1A|1|1B]|$9|1C|A|1D|1|1E]]|E|$]]|$1|F|3|G|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|H|3|I|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|L|3|M|5|N|7|1R|8|@]|D|@]|E|$O|P]]|$1|Q|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]|Y|$5|T|U|V|E|$W|Z]]|10|$5|T|U|V|E|$W|11]]]]

You can remove the back button by passing an empty <code>new Container()</code> as the <a href="https://docs.flutter.io/flutter/material/AppBar/leading.html" rel="noreferrer"><code>leading</code></a> argument to your <a href="https://docs.flutter.io/flutter/material/AppBar-class.html" rel="noreferrer"><code>AppBar</code></a>.
If you find yourself doing this, you probably don't want the user to be able to press the device's back button to get back to the earlier route. Instead of calling <code>pushNamed</code>, try calling <a href="https://docs.flutter.io/flutter/widgets/Navigator/pushReplacementNamed.html" rel="noreferrer"><code>Navigator.pushReplacementNamed</code></a> to cause the earlier route to disappear.
The function <code>pushReplacementNamed</code> will remove the previous route in the backstack and replace it with the new route.
Full code sample for the latter is below.
<pre><code>import 'package:flutter/material.dart';

class LogoutPage extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
 return new Scaffold(
 appBar: new AppBar(
 title: new Text(&quot;Logout Page&quot;),
 ),
 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(&quot;Remove Back Button&quot;),
 ),
 floatingActionButton: new FloatingActionButton(
 child: new Icon(Icons.fullscreen_exit),
 onPressed: () {
 Navigator.pushReplacementNamed(context, &quot;/logout&quot;);
 },
 ),
 );
 }
}

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

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

blocks|key|4055546|text|删除AppBar中的back按钮的一个简单方法是将automaticallyImplyLeading设置为false。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4055547|appBar:+AppBar(
++title:+Text("App+Bar+without+Back+Button"),
++automaticallyImplyLeading:+false,
),|code-block|syntax|javascript|4055548|entityMap^0|P|P|1H|5|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

A simple way to remove the back button in the AppBar is to set <code>automaticallyImplyLeading</code> to <code>false</code>.

<pre><code>appBar: AppBar(
 title: Text("App Bar without Back Button"),
 automaticallyImplyLeading: false,
),
</code></pre>

blocks|key|4055578|text|我相信解决方案如下|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4055579|你实际上要么是：|4055580|不想显示那个丑陋的后退按钮(+:]+)，因此选择：AppBar(...,automaticallyImplyLeading:+false,...)；|unordered-list-item|offset|length|style|CODE|4055581|不希望用户返回(取代当前视图)，从而选择：Navigator.pushReplacementNamed(##+your+routename+here+##)；|BOLD|4055582|不希望用户返回--替换堆栈中的某个视图--从而使用：Navigator.pushNamedAndRemoveUntil(##+your+routename+here+##,+f(Route<dynamic>)→bool);，其中f是一个函数，在满足您希望保留在堆栈中的最后一个视图时返回true(就在新视图之前)；|4055583|不希望用户返回-+EVER+-用：Navigator.pushNamedAndRemoveUntil(context,+##+your+routename+here+##,+(_)+=>+false);完全清空导航器堆栈|4055584|干杯|4055585|entityMap^0|0|0|P|1C|0|8|6|L|1L|0|9|4|Q|2D|3Z|4|0|9|4|H|2C|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|X|8|@$G|Y|H|Z|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|10|8|@$G|11|H|12|I|M]|$G|13|H|14|I|J]]|9|@]|A|$]]|$1|N|3|O|5|F|7|15|8|@$G|16|H|17|I|M]|$G|18|H|19|I|J]|$G|1A|H|1B|I|J]]|9|@]|A|$]]|$1|P|3|Q|5|F|7|1C|8|@$G|1D|H|1E|I|M]|$G|1F|H|1G|I|J]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1H|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]]|U|$]]

I believe the solutions are the following

You actually either:

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

Cheers

blocks|key|5043065|text|++appBar:+new+AppBar(title:+new+Text("SmartDocs+SPAY"),backgroundColor:+Colors.blueAccent,+automaticallyImplyLeading:false,
++++++++leading:+new+Container(),
++++++),|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5043066|它运转得很好|unstyled|5043067|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code> appBar: new AppBar(title: new Text("SmartDocs SPAY"),backgroundColor: Colors.blueAccent, automaticallyImplyLeading:false,
 leading: new Container(),
 ),
</code></pre>

It is working Fine

blocks|key|4055676|text|automaticallyImplyLeading:|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4055677|这将检查我们是否希望在应用程序栏上应用back小部件(领先小部件)。如果automaticallyImplyLeading为false，则自动给标题空间，如果前面的小部件为真，则此参数无效。|4055678|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!"),
++++++++++),
++++++++),
++++++),
++++),
++);
}++|code-block|syntax|javascript|4055679|entityMap^0|0|Q|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

automaticallyImplyLeading:
This checks whether we want to apply the back widget(leading widget) over the app bar or not.
If the automaticallyImplyLeading is false then automatically space is given to the title and if If the leading widget is true, then this parameter has no effect.
<pre><code>void main() {
 runApp(
 new MaterialApp(
 home: new Scaffold(
 appBar: AppBar(
 automaticallyImplyLeading: false, // Used for removing back buttoon. 
 title: new Center(
 child: new Text(&quot;Demo App&quot;),
 ),
 ),
 body: new Container(
 child: new Center(
 child: Text(&quot;Hello world!&quot;),
 ),
 ),
 ),
 ),
 );
} 
</code></pre>

blocks|key|5043115|text|AppBar小部件有一个名为automaticallyImplyLeading的属性。默认情况下，它的值是true。如果您不想自动为您构建后退按钮，那么只需使属性false即可。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5043116|appBar:+AppBar(
++title:+Text("YOUR_APPBAR_TITLE"),+
++automaticallyImplyLeading:+false,
),|code-block|syntax|javascript|5043117|若要添加自定义回退按钮，请执行以下操作|5043118|appBar:+AppBar(
++title:+Text("YOUR_APPBAR_TITLE"),+
++automaticallyImplyLeading:+false,
++leading:+YOUR_CUSTOM_WIDGET(),
),|5043119|entityMap^0|E|P|1H|4|29|5|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|P|$]]

The AppBar widget has a property called <code>automaticallyImplyLeading</code>. By default it's value is <code>true</code>. If you don't want flutter automatically build the back button for you then just make the property <code>false</code>.

<pre><code>appBar: AppBar(
 title: Text("YOUR_APPBAR_TITLE"), 
 automaticallyImplyLeading: false,
),
</code></pre>

To add your custom back button

<pre><code>appBar: AppBar(
 title: Text("YOUR_APPBAR_TITLE"), 
 automaticallyImplyLeading: false,
 leading: YOUR_CUSTOM_WIDGET(),
),
</code></pre>

blocks|key|4632904|text|//如果您想隐藏回按钮，请使用下面的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4632905|class+SecondScreen+extends+StatelessWidget+{
@override
Widget+build(BuildContext+context)+{
return+Scaffold(
++appBar:+AppBar(
++++title:+Text('Remove+Back+Button'),
++++
++++//hide+back+button
++++automaticallyImplyLeading:+false,
+++),
++body:+Center(
++++child:+Container(),
++),
);
}
}|code-block|syntax|javascript|4632906|//如果您想隐藏回按钮并停止pop操作，请使用下面的代码|4632907|class+SecondScreen+extends+StatelessWidget+{

@override
Widget+build(BuildContext+context)+{
+return+new+WillPopScope(

++onWillPop:+()+async+=>+false,
++child:+Scaffold(
++++appBar:+AppBar(
++++++title:+Text("Second+Screen"),
++++++//For+hide+back+button
++++++automaticallyImplyLeading:+false,
++++),
++++body:+Center(
++++++++child:+Column(
++++++++++mainAxisAlignment:+MainAxisAlignment.center,
++++++++++crossAxisAlignment:+CrossAxisAlignment.center,
++++++++++children:+<Widget>[
++++++++++++RaisedButton(
++++++++++++++child:+Text('Back'),
++++++++++++++onPressed:+()+{
++++++++++++++++Navigator.pop(context);
++++++++++++++},
++++++++++++),
++++++++++],
++++++++)
++++),
++),
);
+}|4632908|​|4632909|📷|atomic|offset|length|4632910|4632911|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/c1954a5d26dc0ac348c5c4e39eeeec2c.png|imageAlt^0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|13|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|15|8|@]|9|@]|A|$]]|$1|M|3|N|5|O|7|16|8|@]|9|@$P|17|Q|18|1|19]]|A|$]]|$1|R|3|L|5|6|7|1A|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z|10|-4]]]]

// if you want to hide back button use below code
<pre><code>class SecondScreen extends StatelessWidget {
@override
Widget build(BuildContext context) {
return Scaffold(
 appBar: AppBar(
 title: Text('Remove Back Button'),
 
 //hide back button
 automaticallyImplyLeading: false,
 ),
 body: Center(
 child: Container(),
 ),
);
}
}
</code></pre>
// if you want to hide back button and stop the pop action use below code
<pre><code>class SecondScreen extends StatelessWidget {

@override
Widget build(BuildContext context) {
 return new WillPopScope(

 onWillPop: () async =&gt; false,
 child: Scaffold(
 appBar: AppBar(
 title: Text(&quot;Second Screen&quot;),
 //For hide back button
 automaticallyImplyLeading: false,
 ),
 body: Center(
 child: Column(
 mainAxisAlignment: MainAxisAlignment.center,
 crossAxisAlignment: CrossAxisAlignment.center,
 children: &lt;Widget&gt;[
 RaisedButton(
 child: Text('Back'),
 onPressed: () {
 Navigator.pop(context);
 },
 ),
 ],
 )
 ),
 ),
);
 }
</code></pre>
<a href="https://i.stack.imgur.com/9vK45.png" rel="noreferrer"><img src="https://i.stack.imgur.com/9vK45.png" alt="
[" /></a>

blocks|key|4632929|text|如果导航到另一页。可以使用Navigator.pushReplacement()。如果您正在从登录到主屏幕导航，则可以使用它。或者你可以用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4632930|AppBar(automaticallyImplyLeading:+false)|4632931|entityMap^0|D|R|0|0|14|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

If navigating to another page . <code>Navigator.pushReplacement()</code> can be used. It can be used If you're navigating from login to home screen. Or you can use . 
<code> AppBar(automaticallyImplyLeading: false)</code>

blocks|key|5043182|text|将此用于AppBar条|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|5043183|SliverAppBar+(
++++++++automaticallyImplyLeading:+false,
++++++++elevation:+0,
++++++++brightness:+Brightness.light,
++++++++backgroundColor:+Colors.white,
++++++++pinned:+true,
++++++),|code-block|syntax|javascript|5043184|将此用于普通的Appbar|5043185|+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,

),|5043186|entityMap^0|0|A|0|0|0|D|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|N|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

Use this for slivers AppBar
<pre><code>SliverAppBar (
 automaticallyImplyLeading: false,
 elevation: 0,
 brightness: Brightness.light,
 backgroundColor: Colors.white,
 pinned: true,
 ),
</code></pre>
Use this for normal Appbar
<pre><code> appBar: AppBar(
 title: Text
 (&quot;You decide on the appbar name&quot;
 style: TextStyle(color: Colors.black,), 
 elevation: 0,
 brightness: Brightness.light,
 backgroundColor: Colors.white,
 automaticallyImplyLeading: false,

),
</code></pre>

blocks|key|4055782|text|只要让它透明，不要在预先发送的时候采取任何行动|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4055783|AppBar(
++++++++++++leading:+IconButton(
++++++++++++++icon:+Icon(
++++++++++++++++Icons.arrow_back,
++++++++++++++++color:+Colors.white.withOpacity(0),
++++++++++++++),
++++++++++++++onPressed:+()+{},
++++++++++++),|code-block|syntax|javascript|4055784|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Just Make it transparent, and no action while pressend
<pre><code>AppBar(
 leading: IconButton(
 icon: Icon(
 Icons.arrow_back,
 color: Colors.white.withOpacity(0),
 ),
 onPressed: () {},
 ),
</code></pre>

blocks|key|4055812|text|SliverAppBar(+automaticallyImplyLeading:+false，}|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4055813|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

SliverAppBar(
automaticallyImplyLeading: false,}

blocks|key|4632980|text|只需在AppBar()中使用AppBar|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4632981|appBar:+AppBaar(
++automaticallyImplyLeading:+false,
)|code-block|syntax|javascript|4632982|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

just use automaticallyImplyLeading in AppBar()
<pre><code>appBar: AppBaar(
 automaticallyImplyLeading: false,
)
</code></pre>

blocks|key|5043260|text|当您使用Navigator.pushNamed时，反箭头将自动显示在新屏幕的appBar上，以便返回到前一个屏幕。如果不需要此功能，只需在automaticallyImplyLeading:+false属性中写入appBar即可。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5043261|entityMap^0|4|J|1X|W|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

When you use <code>Navigator.pushNamed</code> the back-arrow appears automatically on the new screen's appBar for going back to the previous screen. If you don't want this functionality all you have to do is write <code>automaticallyImplyLeading: false</code> in your appBar properties.

I am wondering, if anyone knows of a way to remove the back button that shows up on the <code>appBar</code> in a flutter app when you use <code>Navigator.pushNamed</code> to go to another page. The reason I do not want it on this resulting page is that it is coming from the navigation and I want users to use the <code>logout</code> button instead, so that the session starts over.

flutter remove back button on appbar

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想知道，当您使用appBar转到另一个页面时，是否有人知道有什么方法可以删除显示在Navigator.pushNamed应用程序中的后退按钮。我不希望它出现在这个结果页面上的原因是，它来自导航，我希望用户使用logout按钮，以便会话重新开始。

问颤振移除应用程序栏上的后退按钮
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