Appbar Not Showing Back Button

Flutter Scaffold Appbar not showing the back button

Try to make your own back button :

     appBar: AppBar(
                    leading: IconButton(
                    icon: Icon(Icons.arrow_back_ios),
                    iconSize: 20.0,
                    onPressed: () {
                      _goBack(context);
                    },
                  ),
                  centerTitle: true,
                  title: Text('back')),

And the _goBack method :

 _goBack(BuildContext context) {
Navigator.pop(context);

}

Flutter 2.0 appbar back button disappeared if contains endDrawer

This is current behavior in version 2.0, if condition also check !hasEndDrawer

version 1.17

if (canPop)
          leading = useCloseButton ? const CloseButton() : const BackButton();

https://github.com/flutter/flutter/blob/aee9e94c21009bfc6c08f442eacde06f001c25f9/packages/flutter/lib/src/material/app_bar.dart#L510

version 2.0

if (!hasEndDrawer && canPop)
      leading = useCloseButton ? const CloseButton() : const BackButton();

https://github.com/flutter/flutter/blob/ca2bef6ee915d943b5a160055b5065ec3391f19a/packages/flutter/lib/src/material/app_bar.dart#L793

You can add your own logic in leading

code snippet

appBar: AppBar(
        leading: Builder(
          builder: (BuildContext context) {
            final ScaffoldState scaffold = Scaffold.maybeOf(context);
            final ModalRoute<dynamic> parentRoute = ModalRoute.of(context);
            final bool hasEndDrawer = scaffold?.hasEndDrawer ?? false;
            final bool canPop = parentRoute?.canPop ?? false;

            if (hasEndDrawer && canPop) {
              return BackButton();
            } else {
              return SizedBox.shrink();
            }
          },
        ),
        title: Text('Page 2'),
      ),

working demo

full code

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Page1(),
    );
  }
}

class Page1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Container(
        child: Center(
            child: TextButton(
          child: Text(
            'Page 1',
            style: TextStyle(fontSize: 30.0, fontWeight: FontWeight.bold),
          ),
          onPressed: () {
            Navigator.push(
                context, MaterialPageRoute(builder: (context) => Page2()));
          },
        )),
      ),
    );
  }
}

class Page2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        leading: Builder(
          builder: (BuildContext context) {
            final ScaffoldState scaffold = Scaffold.maybeOf(context);
            final ModalRoute<dynamic> parentRoute = ModalRoute.of(context);
            final bool hasEndDrawer = scaffold?.hasEndDrawer ?? false;
            final bool canPop = parentRoute?.canPop ?? false;

            if (hasEndDrawer && canPop) {
              return BackButton();
            } else {
              return SizedBox.shrink();
            }
          },
        ),
        title: Text('Page 2'),
      ),
      body: Container(
        child: Center(
          child: TextButton(
            child: Text(
              'Page 2',
              style: TextStyle(fontSize: 30.0, fontWeight: FontWeight.bold),
            ),
            onPressed: () {
              Navigator.pop(context);
            },
          ),
        ),
      ),
      endDrawer: Drawer(),
    );
  }
}

flutter remove back button on appbar

You can remove the back button by passing an empty new Container() as the leading argument to your AppBar.

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 pushNamed, try calling Navigator.pushReplacementNamed to cause the earlier route to disappear.

The function pushReplacementNamed will remove the previous route in the backstack and replace it with the new route.

Full code sample for the latter is below.

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(),
      },
    );
  }
}

How to change the appBar back button color

You have to use the iconTheme property from the AppBar , like this:

appBar: AppBar(
  iconTheme: IconThemeData(
    color: Colors.black, //change your color here
  ),
  title: Text("Sample"),
  centerTitle: true,
),

Or if you want to handle the back button by yourself.

appBar: AppBar(
  leading: IconButton(
    icon: Icon(Icons.arrow_back, color: Colors.black),
    onPressed: () => Navigator.of(context).pop(),
  ), 
  title: Text("Sample"),
  centerTitle: true,
),

Even better, only if you want to change the color of the back button.

appBar: AppBar(
  leading: BackButton(
     color: Colors.black
   ), 
  title: Text("Sample"),
  centerTitle: true,
),

Appbar not showing back button

Try this

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);

back button inside AppBar showing black screen in flutter

The reason why you see a blank screen is because you navigated using pushReplacement. What pushReplacement does it that it will navigate to the next screen without stacking itself to the route meaning that it will make the app forget that the last screen was your screen B. Try using Navigator.push() instead.

Here is an example:

onPressed: () {
  Navigator.push(
    context,
    MaterialPageRoute(builder: (context) => ScreenC()),
  );
}

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