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Posted 2022-08-18

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import 鈥榩ackage:flutter/material.dart鈥?span style="color: #000000;">;
import 鈥榩ackage:flutter_app/bottom_navigation_widget.dart鈥?span style="color: #000000;">;

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

class MyApp extends StatelessWidget 

  @override
  Widget build(BuildContext context) 
    return MaterialApp(
      title: 鈥楩lutter Demo鈥?span style="color: #000000;">,
      theme: ThemeData(
        primarySwatch: Colors.green,  //瀹氫箟涓婚椋庢牸    primarySwatch
      ),
      home: new BottomNavigationWidget(),
    );
  

import 鈥榩ackage:flutter/material.dart鈥?span style="color: #000000;">;
import 鈥榩ackage:flutter_app/pages/AirplayScreen.dart鈥?span style="color: #000000;">;
import 鈥榩ackage:flutter_app/pages/EmailScreen.dart鈥?span style="color: #000000;">;
import 鈥榩ackage:flutter_app/pages/HomeScreen.dart鈥?span style="color: #000000;">;
import 鈥榩ackage:flutter_app/pages/PagesScreen.dart鈥?span style="color: #000000;">;


class BottomNavigationWidget extends StatefulWidget 
  _BottomNavigationWidgetState createState() => _BottomNavigationWidgetState();


class _BottomNavigationWidgetState extends State<BottomNavigationWidget> 
//  final _BottomNavigationColor = Colors.blue;
  int _currentIndex = 0;
  List<Widget> list = List();
  @override
  void initState()
    list
      ..add(HomeScreen())
      ..add(EmailScreen())
      ..add(PagesScreen())
      ..add(AirplayScreen());
    super.initState();
  
  @override
  Widget build(BuildContext context) 
    return Scaffold(
      body: list[_currentIndex],
      bottomNavigationBar: BottomNavigationBar(
          items: [
            BottomNavigationBarItem(
                icon:Icon(
                  Icons.home,
//                  color:_BottomNavigationColor,
                ),
                title:Text(
                    鈥楬ome鈥?span style="color: #000000;">,
//                    style:TextStyle(color:_BottomNavigationColor)
                )
            ),
            BottomNavigationBarItem(
                icon:Icon(
                  Icons.email,
//                  color:_BottomNavigationColor,
                ),
                title:Text(
                    鈥楨mail鈥?span style="color: #000000;">,
//                    style:TextStyle(color:_BottomNavigationColor)
                )
            ),
            BottomNavigationBarItem(
                icon:Icon(
                  Icons.pages,
//                  color:_BottomNavigationColor,
                ),
                title:Text(
                    鈥楶ages鈥?span style="color: #000000;">,
//                    style:TextStyle(color:_BottomNavigationColor)
                )
            ),
            BottomNavigationBarItem(
                icon:Icon(
                  Icons.airplay,
//                  color:_BottomNavigationColor,
                ),
                title:Text(
                    鈥楢ipPlay鈥?span style="color: #000000;">,
//                    style:TextStyle(color:_BottomNavigationColor)
                )
            ),
          ],
          currentIndex:_currentIndex,
          onTap:(int index)
            setState(()
              _currentIndex= index;
            );
          ,
          selectedItemColor: Colors.green,
//          unselectedItemColor: Colors.grey,
          type:BottomNavigationBarType.fixed
      ),
    );
  

HomeScreen.dart 

import 鈥榩ackage:flutter/material.dart鈥?span style="color: #000000;">;

class HomeScreen extends StatelessWidget 
  @override
  Widget build(BuildContext context) 
    return Scaffold(
        appBar:AppBar(
          title: Text(鈥楬OME鈥?span style="color: #000000;">),
        ),
        body:Center(
          child: Text(鈥楬OME鈥?span style="color: #000000;">),
        )
    );
  

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