import 'package:flutter/material.dart';void main() => runApp(new BottomAppBarDemo());class BottomAppBarDemo extends StatelessWidget {  @override  Widget build(BuildContext context) {    return MaterialApp(        home: Scaffold(      appBar: AppBar(        title: Text("BottomAppBar"),      ),      floatingActionButton: FloatingActionButton(        onPressed: null,        child: Icon(Icons.add),      ),      floatingActionButtonLocation: FloatingActionButtonLocation.endDocked,      bottomNavigationBar: BottomAppBar(        child: BottomNavigationBar(          items: 
    
     [            BottomNavigationBarItem(icon: Icon(Icons.add), title: Text("add")),            BottomNavigationBarItem(                icon: Icon(Icons.delete), title: Text("delete"))          ],        ),      ),    ));  }}复制代码
    

floatingActionButtonLocation 属性设置 FAB 位置

FloatingActionButtonLocation.endDockedFloatingActionButtonLocation.centerDockedFloatingActionButtonLocation.endFloatFloatingActionButtonLocation.centerFloat复制代码

floatingActionButtonLocation: FloatingActionButtonLocation.endDocked：复制代码

floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked：复制代码

floatingActionButtonLocation: FloatingActionButtonLocation.endFloat：复制代码

floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat：复制代码