Flutter - 创建侧滑菜单

侧滑菜单在安卓App里面非常常见，比如Gmail，Google Play，Twitter等。看下图

网上也有很多创建侧滑菜单的教程，我也来记录一下，自己学习创建Drawer的过程。

1. 创建一个空的App

import 'package:flutter/material.dart';

class HomePage extends StatefulWidget{
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text('Hello Flutter'),
      ),
      body: new Center(
        child: new Text('Hello, Flutter!