eitc-erm-app/lib/bottom_navigation.dart

import 'dart:io';

import 'package:eitc_erm_app/utils/Component.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import 'home.dart';
import 'mine.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  runApp(BottomNavigationWidget());
}

class BottomNavigationWidget extends StatefulWidget {
  @override
  _BottomNavigationWidgetState createState() => _BottomNavigationWidgetState();
}

class _BottomNavigationWidgetState extends State<BottomNavigationWidget> {
  final bottomNavigationColor = Colors.blue;
  int curIndex = 0;
  List<Widget> pages = [];
  int lastExitTime = 0;

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    pages
      ..add(Home(context))
      ..add(Mine());
    return PopScope(
        canPop: !Platform.isAndroid,
        onPopInvokedWithResult: _onPopInvoke,
        child: Scaffold(
          body: pages[curIndex],
          bottomNavigationBar: BottomNavigationBar(
            items: [
              BottomNavigationBarItem(
                icon: Icon(Icons.home, color: bottomNavigationColor),
                label: '首页',
                // title: Text('home1', style: TextStyle(color: bottomNavigationColor))
              ),
              BottomNavigationBarItem(
                icon: Icon(Icons.person, color: bottomNavigationColor),
                label: '我的',
                // title: Text('home', style: TextStyle(color: bottomNavigationColor))
              )
            ],
            currentIndex: curIndex,
            onTap: (int index) {
              setState(() {
                curIndex = index;
              });
            },
            fixedColor: Colors.blue,
            type: BottomNavigationBarType.fixed,
          ),
        ));
  }

  void _onPopInvoke(bool didPop, dynamic result) {
    if (didPop) {
      return;
    }
    int now = DateTime.now().millisecondsSinceEpoch;
    if (lastExitTime == 0 || now - lastExitTime > 2000) {
      Component.toast("再次点击退出应用", 2);
      lastExitTime = now;
      return;
    }
    SystemNavigator.pop(animated: true);
  }
}