Answers for "add bottom navigation bar flutter"

bottomnavigationbar flutter

bottomNavigationBar: BottomNavigationBar(
          type: BottomNavigationBarType.fixed,
          items: [
            BottomNavigationBarItem(
            icon: Icon(Icons.home),
            label: 'Home',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.business),
            label: 'Business',
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.school),
            label: 'School',
          ),
          ],
        ),

flutter bottom navigation bar

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Title of Application',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        visualDensity: VisualDensity.adaptivePlatformDensity,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

  @override
  State<StatefulWidget> createState() {
    return MyHomePageState();
  }

}

class MyHomePageState extends State<MyHomePage> {
  int selectedIndex = 0;
  Widget _myContacts = MyContacts();
  Widget _myEmails = MyEmails();
  Widget _myProfile = MyProfile();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("BottomNavigationBar Example"),
      ),
      body:  this.getBody(),
      bottomNavigationBar: BottomNavigationBar(
        type: BottomNavigationBarType.fixed,
        currentIndex: this.selectedIndex,
        items: [
          BottomNavigationBarItem(
            icon: Icon(Icons.contacts),
            title: Text("Contacts"),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.mail),
            title: Text("Emails"),
          ),
          BottomNavigationBarItem(
            icon: Icon(Icons.person),
            title: Text("Profile"),
          )
        ],
        onTap: (int index) {
          this.onTapHandler(index);
        },
      ),
    );
  }

  Widget getBody( )  {
    if(this.selectedIndex == 0) {
      return this._myContacts;
    } else if(this.selectedIndex==1) {
      return this._myEmails;
    } else {
      return this._myProfile;
    }
  }

  void onTapHandler(int index)  {
    this.setState(() {
      this.selectedIndex = index;
    });
  }
}

class MyContacts extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(child: Text("Contacts"));
  }
}

class MyEmails extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(child: Text("Emails"));
  }
}

class MyProfile extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Center(child: Text("Profile"));
  }
}

flutter bottom navigation bar four items

bottomNavigationBar: BottomNavigationBar(
  type: BottomNavigationBarType.fixed, // This is all you need!
  items: // ...,
)

flutter bottomNavigationBar

Scaffold(
  body: Container(
    color: Colors.white,
    child: Center(child: Text("Flutter"),),
  ),
  bottomNavigationBar: new Container(
    padding: EdgeInsets.all(0.0),
    child: Row(
      mainAxisSize: MainAxisSize.max,
      children: <Widget>[

        Expanded(
          flex: 1,
          child: FlatButton.icon(
            onPressed: () {
            },
            icon: Icon(Icons.search),
            label: Text("Search"),
          ),
        ),
        Expanded(
          flex: 1,
          child: FlatButton.icon(
            onPressed: () {
            },
            icon: Icon(Icons.search),
            label: Text("Search"),
          ),
        ),
        Expanded(
          flex: 1,
          child: FlatButton.icon(
            onPressed: () {
            },
            icon: Icon(Icons.search),
            label: Text("Search"),
          ),
        ),
      ],
    ),
  ),
);

change bottom navigation bar from button flutter

Having such functionality can decrease your thinking capabilities. If you still
want to here is the link you can check out.

https://medium.com/@theboringdeveloper/common-bottom-navigation-bar-flutter-e3693305d2d