How to create a custom AppBar widget?

Question

I'm new to flutter. I'm trying to create a custom appbar widget and importing the widget in pages.

But I was unable to create the widget.

import 'package:flutter/material.dart';
 
 class AppBar extends StatelessWidget{
  @override
  Widget build(BuildContext context){
return AppBar(
  title: Text('Ordering'),
  actions: <Widget>[
    IconButton(
      onPressed: _incrementCounter,
      icon: Icon(Icons.add),
    ),
    BadgeIconButton(
      itemCount: _counter,
      badgeColor: Color.fromRGBO(37, 134, 16, 1.0),
      badgeTextColor: Colors.white,
      icon: Icon(Icons.shopping_cart, size: 30.0,),
      onPressed: () {}
    ),
  ],
);

} }'

Solution 1

import 'package:flutter/material.dart';

class CustomAppBar extends StatefulWidget implements PreferredSizeWidget {
    CustomAppBar({Key key}) : preferredSize = Size.fromHeight(kToolbarHeight), super(key: key);

    @override
    final Size preferredSize; // default is 56.0

    @override
    _CustomAppBarState createState() => _CustomAppBarState();
}

class _CustomAppBarState extends State<CustomAppBar>{

    @override
    Widget build(BuildContext context) {
        return AppBar( title: Text("Sample App Bar") );
    }
}

Hopefully this helps

Solution 2

class AppBars extends AppBar {
  AppBars():super(
    iconTheme: IconThemeData(
      color: Colors.black, //change your color here
    ),
    backgroundColor: Colors.white,
    title: Text(
      "this is app bar",
      style: TextStyle(color: Color(Constant.colorBlack)),
    ),
    elevation: 0.0,
    automaticallyImplyLeading: false,
    actions: <Widget>[
      IconButton(
        icon: Icon(Icons.notifications),
        onPressed: () => null,
      ),
      IconButton(
        icon: Icon(Icons.person),
        onPressed: () => null,
      ),
    ],
  );
}

Solution 3

Widget build(BuildContext context) {
  return new Scaffold(
    appBar: setAppBar(),
    body: new Container() // add rest of the UI
  );
}
Widget setAppBar() {
  return new AppBar(
  //backgroundColor: Colors.blue,
  //automaticallyImplyLeading: true
  elevation: 0.0, // for elevation
  titleSpacing: 0.0, // if you want remove title spacing with back button
  title:  UtilCommonWidget.addTextMedium('About US', Colors.white, 20.0, 1),
  actions: <Widget>[
    addAppBarActionWidgetProfile(icon, 30.0, 30.0, 15.0) // add your custom action widget
  ],//Action icon search as search icon, notification icon
  leading: new Material( //Custom leading icon, such as back icon or other icon
    color: Colors.transparent,
    child: new InkWell(
      onTap: () {
        Navigator.of(context).pop();
      },
      splashColor: UniQueryColors.colorGradientEnd.withOpacity(.5),
      child: new Container(
          padding: const EdgeInsets.fromLTRB(12.0, 16.0, 16.0, 16.0),
          child: UtilCommonWidget.addImage(Constant.iconBack, 19.0, 10.0))
      ),
  )
 );
}

Solution 4

AppBar implements the class PreferredSizeWidget which means that AppBar must have a preferred size.

preferredSize variable is overridden as it is implemented from PreferredSizeWidget, here you can set the height of your wish.

class CustomAppBar extends StatefulWidget implements PreferredSizeWidget {
  CustomAppBar({Key key}) : preferredSize = Size.fromHeight(60.0), super(key: key);

  @override
  final Size preferredSize;

  @override
  _CustomAppBarState createState() => _CustomAppBarState();
}

class _CustomAppBarState extends State<CustomAppBar>{

  @override
  Widget build(BuildContext context) {
    return AppBar(
      title: Text('App Bar'),
      actions: <Widget>[
        IconButton(
          icon: Icon(Icons.add, color: Colors.white,),
        ),
      ],
    );
  }
}

And use like this

class _MyHomePageState extends State<MyHomePage> {
  
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: CustomAppBar()
    );
  }

Solution 5

I extended AppBar with my custom widget. Then passed my parameters to the super class.

class CustomAppBar extends AppBar {
  CustomAppBar()
      : super(
          title: Text('MyApp'),
          actions: [
            IconButton(icon: Icon(Icons.search), onPressed: () {}),
          ],
        );
}

View more solutions