开发一个flutter app

重新开启了flutter学习，因为一个大创项目

很对不起王建民主任，教导的软件需求知识，我完全没有用到。

首先配置环境 需要用android studio 自己用idea一直出错。所以一定要选择用android studio ，随便在网上找个教程就可以了

在android 中 build.gradle 添加以下代码 确保app启动慢的问题

    allprojects {repositories {google()mavenCentral()maven { url 'https://maven.aliyun.com/repository/google' }maven { url 'https://maven.aliyun.com/repository/jcenter' }maven { url 'https://maven.aliyun.com/repository/central' }maven { url 'https://storage.flutter-io.cn/download.flutter.io' }}}

　　这次要开发完整的项目，要比之前难，而且界面必须美观，不能像之前一样了

 

根据登录界面来学习‘

import 'package:flutter/material.dart';
import 'register_page.dart';
import 'home_page.dart'; // 确保你已经导入了 HomePageclass LoginPage extends StatefulWidget {@override_LoginPageState createState() => _LoginPageState();
}class _LoginPageState extends State<LoginPage> {final TextEditingController _usernameController = TextEditingController();final TextEditingController _passwordController = TextEditingController();@overrideWidget build(BuildContext context) {return Scaffold(backgroundColor: Colors.white,body: SingleChildScrollView( // 添加可滚动视图
        child: Container(padding: EdgeInsets.only(bottom: MediaQuery.of(context).viewInsets.bottom + 20), // 防止键盘遮挡
          child: Column(children: <Widget>[Container(height: 400,decoration: BoxDecoration(image: DecorationImage(image: AssetImage('assets/images/login/background.png'),fit: BoxFit.cover,),),child: Stack(children: <Widget>[Positioned(top: 50,left: 0,right: 0,child: Container(margin: EdgeInsets.only(top: 50),child: Text("登录", style: TextStyle(color: Colors.white, fontSize: 40, fontWeight: FontWeight.bold)),),)],),),Padding(padding: EdgeInsets.all(30.0),child: Column(children: <Widget>[Container(padding: EdgeInsets.all(5.0),decoration: BoxDecoration(color: Colors.white,borderRadius: BorderRadius.circular(10),boxShadow: [BoxShadow(color: Color.fromRGBO(143, 148, 251, 0.3),blurRadius: 20.0,offset: Offset(0, 10))]),child: Column(children: <Widget>[Container(padding: EdgeInsets.all(8.0),decoration: BoxDecoration(border: Border(bottom: BorderSide(color: Colors.grey)),),child: TextField(controller: _usernameController,decoration: InputDecoration(border: InputBorder.none,hintText: "请输入账号",hintStyle: TextStyle(color: Colors.grey[400]),),),),Container(padding: EdgeInsets.all(8.0),child: TextField(controller: _passwordController,decoration: InputDecoration(border: InputBorder.none,hintText: "请输入密码",hintStyle: TextStyle(color: Colors.grey[400]),),obscureText: true, // 隐藏密码
                            ),)],),),SizedBox(height: 30,),GestureDetector(onTap: () {_submitForm();},child: Container(height: 50,decoration: BoxDecoration(borderRadius: BorderRadius.circular(10),gradient: LinearGradient(colors: [Color.fromRGBO(143, 148, 251, 1),Color.fromRGBO(143, 148, 251, 0.6),])),child: Center(child: Text("登录", style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold)),),),),SizedBox(height: 20,),Row(mainAxisAlignment: MainAxisAlignment.center,children: <Widget>[Text("没有账号？", style: TextStyle(color: Colors.black)),GestureDetector(onTap: () {Navigator.push(context, MaterialPageRoute(builder: (context) => RegisterPage()));},child: Text("注册", style: TextStyle(color: Color.fromRGBO(143, 148, 251, 1))),),],),],),)],),),),);}void _submitForm() {String username = _usernameController.text;String password = _passwordController.text;if (username == '123' && password == '123') {Navigator.push(context, MaterialPageRoute(builder: (context) => HomePage()));} else {showDialog(context: context,builder: (BuildContext context) {return AlertDialog(title: Text("登录失败"),content: Text("用户名或密码错误"),actions: <Widget>[TextButton(child: Text("确定"),onPressed: () {Navigator.of(context).pop();},),],);},);}}
}

 目前也是开发了一个还算可以的页面，后续要和画师的风格通一，后续还要修改 这个页面仅供学习。