3.Flutter开发玩安卓app-网络请求及全局状态管理

╰+哭是因爲堅強的太久メ 2021-09-10 16:20 434阅读 0赞

#### 网络请求开始 ####

**前言**  
网络请求，我们得先知道网络请求的地址对吧，先来我们玩安卓看一下[玩安卓开放api][api]  
**问题**  
这里讲一下我自己使用玩安卓api实现的时候遇到的问题，主要问题就是登陆后cookies的存储

5.1 登录
    https://www.wanandroid.com/user/login
    
    方法：POST
    参数：
        username，password
    登录后会在cookie中返回账号密码，只要在客户端做cookie持久化存储即可自动登录验证。

玩安卓的认证方式是采用cookies，所以就涉及到我们客户端如何存储cookies，然后现有flutter中有哪些能用的库方便我们操作

#### 网络请求及cookies存储 ####

*  首先网络请求我使用的是[Dio][]
 *  cookies存储使用的是:[dio\_cookie\_manager][dio_cookie_manager]  
    **注意**:由于在使用cookie\_manager时如果采用的是持久化存储，就需要在本地一个目录保存cookies信息，但是如果只按照网上的方法，就是

dio.interceptors.add(CookieManager(PersistCookieJar(dir: "/cookies")));

这样来的话，在不同的平台上会有错误，错误信息就是，权限的问题，所以我猜测是填写的dir地址，在新建文件夹的时候没有权限，所以另外还需要使用一个库[path\_provider][path_provider]然后使用如下方式获取一个临时目录，就不会出现权限问题了

Directory tempDir = await getTemporaryDirectory();
        cookiePath = tempDir.path;

再贴上ymal需要添加的依赖

dependencies:
      #  网络请求
      dio: ^3.0.0
      dio_cookie_manager: 1.0.0
      path_provider: ^1.3.0

#### 网络请求讲解结束 ####

#### 状态管理开始 ####

状态管理在项目中我使用的是[provider][]  
同时，为了保存用户的信息，和当前状态的信息，新建了三个model信息（userinfo，mytheme,profile），  
也是通过json转model的方式来实现的，因为后面还需要将model保存到本地，采用了[shared\_preferences][shared_preferences],需要将model转成json存到本地  
userinfo.json

{
      "username":"",
      "pwd":"",
      "islogin":false
    }

mytheme.json(这里只设置了app的主题颜色)

{
      "themecolor":0
    }

profile.json

{
      "userinfo":"$userinfo",
      "theme":"$mytheme"
    
    }

运行:

flutter packages pub run json_model

生成model成功之后，我们添加需要使用到依赖

dependencies:
      #  数据管理层
      provider: 3.0.0+1
    
    dev_dependencies:
      shared_preferences: ^0.5.3

# 在common下新建一个store.dart文件 #

import 'dart:io';
    
    import 'package:path_provider/path_provider.dart';
    import 'package:flutter/material.dart';
    import 'package:wanandroid_client_app/models/index.dart';
    import 'package:shared_preferences/shared_preferences.dart';
    import 'dart:convert';
    
    
    
    class Store{
    
      static String cookiePath;
    
      static Profile profile;
      static ColorSwatch themeColor;
      static SharedPreferences sharedPreferences;
    
      static dynamic init({context,child}) async{
    //    初始化获取本地数据
        sharedPreferences = await SharedPreferences.getInstance();
    //    获取cookie保存的目录
        Directory tempDir = await getTemporaryDirectory();
        cookiePath = tempDir.path;
        print(cookiePath);
    // 通过sharedPreferences获取本地app配置
        if(sharedPreferences.get("profile")==null){
    //      说明本地没有配置，一般是第一次进入app，我们就新建配置信息
          profile  = Profile();
          Userinfo userInfo = Userinfo();
    //  设置用户名密码是空字符串
          userInfo.username="";
          userInfo.pwd="";
    // 设置是否有用户登录为否
          userInfo.islogin = false;
          profile.userinfo = userInfo;
          Mytheme mytheme = Mytheme();
    // 设置当前app的颜色默认为样式数组中的第一个
          mytheme.themecolor = themeColors[0].value;
          themeColor = themeColors[0];
          profile.theme = mytheme;
    // 调用save方法，保存app配置到本地
          save();
        }else{
    // 如果不为空，说明我们之前保存过设置到本地，因为保存时是保存的json格式，我们需要转换为对象
          profile = Profile.fromJson(jsonDecode(sharedPreferences.get("profile")));
        }
        print("初始化数据为");
        print(jsonDecode(sharedPreferences.get("profile")));
    //    根据themecolor判断当前是哪一个color
        for(int i=0;i<themeColors.length;i++){
          if(themeColors[i].value==profile.theme.themecolor){
            themeColor = themeColors[i];
            break;
          }
        }
      }
    
      //保存数据到本地，将配置对象转成json保存
      static save(){
        sharedPreferences.setString("profile", jsonEncode(profile.toJson()));
      }
    }
    
    
    // 创建一个配置文件管理通知类
    class ProfileNotifier with ChangeNotifier{
      Profile get profile => Store.profile;
    
      @override
      void notifyListeners() {
    // 调用save方法，将新的配置信息保存到本地
        Store.save();
        super.notifyListeners();
      }
    }
    
    // 用户信息管理通知类
    class UserInfoNotifier extends ProfileNotifier{
      Userinfo get userinfo => profile.userinfo;
    
    // 设置用户信息，比如退出登录或者登陆时
      set setUserinfo(newuserinfo){
        profile.userinfo = newuserinfo;
        notifyListeners();
      }
    
    
    }
    
    // 主题颜色配置表
    const List<ColorSwatch> themeColors = [
      Colors.blue,
      Colors.deepOrange,
      Colors.green,
      Colors.purple,
      Colors.pink,
      Colors.amber
    
    ];
    
    // 主体颜色修改通知类
    class ThemeNotifier extends ProfileNotifier{
      ColorSwatch get themecolor =>Store.themeColor;
    
      set setThemeColor(ColorSwatch newcolor){
        Store.themeColor = newcolor;
        profile.theme.themecolor = Store.themeColor.value;
        notifyListeners();
      }
    }

## 网络请求文件创建 ##

*  在service目录下新建net.dart

import 'package:dio/dio.dart';
    import 'package:wanandroid_client_app/models/index.dart';
    import 'dart:math';
    import 'package:wanandroid_client_app/common/static_info.dart';
    import 'package:wanandroid_client_app/common/store.dart';
    import 'package:cookie_jar/cookie_jar.dart';
    import 'package:dio_cookie_manager/dio_cookie_manager.dart';
    
    const String login = "user/login";
    const String register = "user/register";
    const String logout = "user/logout/json";
    const String banner = "banner/json";
    const String tree = "tree/json";
    const String nav = "navi/json";
    const String projectfl = "project/tree/json";
    const String projectList = "project/list/PAGE/json?cid=CID";
    const String tixiList = "article/list/PAGE/json?cid=CID";
    const String gzh = "wxarticle/chapters/json";
    const String gzhList = "wxarticle/list/CID/PAGE/json";
    const String collectList = "lg/collect/list/PAGE/json";
    String article = "article/list/pageIndex/json";
    String collect = "lg/collect/Index/json";
    String uncollect = "lg/uncollect_originId/Index/json";
    
    
    
    //获取请求对象
    Dio getDio() {
      BaseOptions baseOptions = BaseOptions(
        baseUrl: "https://www.wanandroid.com/",
      );
      Dio dio = Dio(baseOptions);
    //  添加cookie管理
    //  if(Store.profile.userinfo.islogin){
    //
    //  }
      dio.interceptors.add(CookieManager(PersistCookieJar(dir: Store.cookiePath)));
      dio.interceptors.add(LogInterceptor(responseBody: false)); //开启请求日志
      return dio;
    }
    //用户登录
    dynamic mylogin(String username, String pwd) async {
      Map<String, String> queryParameters = {"username": username, "password": pwd};
      Dio dio = getDio();
      Response response = await dio.post(login, queryParameters: queryParameters);
      Map<String, dynamic> res = response.data;
      return BaseResponse.fromJson(res);
    }
    //获取首页banner
    Future<List<Banner>> getBanner() async {
      Dio dio = getDio();
      Response response = await dio.get(banner);
      Map<String, dynamic> res = response.data;
      BaseListResponse baseListResponse = BaseListResponse.fromJson(res);
      List<Banner> banners = List<Banner>();
      if (baseListResponse.errorCode == 0) {
    //    说明获取数据没有错误
        for (int i = 0; i < baseListResponse.data.length; i++) {
          banners.add(Banner.fromJson(baseListResponse.data[i]));
        }
      }
      return  banners;
    }
    
    //获取首页文章
    Future<Page> getArticle(int index)async{
    
      Dio dio = getDio();
      String newarticle = article.replaceAll("pageIndex", index.toString());
      Response response = await dio.get(newarticle);
      Map<String, dynamic> res = response.data;
      BaseResponse baseListResponse = BaseResponse.fromJson(res);
      Page page = Page.fromJson(baseListResponse.data);
      for(int i=0;i<page.datas.length;i++){
        page.datas[i].shareUser = Random().nextInt(2)==1?StaticInfo.manIcon.replaceAll("Index", Random().nextInt(50).toString()):StaticInfo.womanIcon.replaceAll("Index", Random().nextInt(50).toString());
      }
      return page;
    }
    
    //收藏文章
    Future<int> collectArticle(int index)async{
      Dio dio = getDio();
      String collectUrl = collect.replaceAll("Index", index.toString());
      Response response =  await dio.post(collectUrl);
      Map<String, dynamic> res = response.data;
      BaseResponse baseResponse = BaseResponse.fromJson(res);
      return baseResponse.errorCode;
    
    }
    
    
    //取消收藏文章
    Future<int> unCollectArticle(int index)async{
      Dio dio = getDio();
      String uncollectUrl = uncollect.replaceAll("Index", index.toString());
      Response response =  await dio.post(uncollectUrl);
      Map<String, dynamic> res = response.data;
      BaseResponse baseResponse = BaseResponse.fromJson(res);
      return baseResponse.errorCode;
    
    }
    
    ////获取体系分类
    Future<List<Txouter>> getTreeJson()async{
      List<Txouter> txouter = List<Txouter>();
      Dio dio = getDio();
      Response response = await dio.get(tree);
      Map<String, dynamic> res = response.data;
      TreeResponse treeResponse = TreeResponse.fromJson(res);
      if(treeResponse.errorCode==0){
        txouter = treeResponse.data;
      }
      return txouter;
    }
    
    //获取导航数据
    Future<List<Navouter>> getNavJson() async{
      List<Navouter> navouters = List<Navouter>();
      Dio dio = getDio();
      Response response = await dio.get(nav);
      Map<String, dynamic> res = response.data;
      NavResponse navResponse = NavResponse.fromJson(res);
      if(navResponse.errorCode==0){
        navouters = navResponse.data;
      }
      return navouters;
    }
    
    //获取项目的分类
    Future<List<Projectfl>> getProjectFl() async{
      List<Projectfl> projectfls = List<Projectfl>();
      Dio dio = getDio();
      Response response = await dio.get(projectfl);
      Map<String, dynamic> res = response.data;
      ProjectReponse projectReponse = ProjectReponse.fromJson(res);
      if(projectReponse.errorCode==0){
        projectfls = projectReponse.data;
      }
      return projectfls;
    }
    
    //获取项目列表数据
    Future<List<ProjectAllOuterChild>> getProjectList(int page,int cid) async{
      List<ProjectAllOuterChild> projectAllOuterChild = List<ProjectAllOuterChild>();
      ProjectAllOuter projectAllOuter;
      Dio dio = getDio();
      Response response = await dio.get(projectList.replaceAll("PAGE", page.toString()).replaceAll("CID", cid.toString()));
      Map<String, dynamic> res = response.data;
      ProjectAllResponse projectAllResponse = ProjectAllResponse.fromJson(res);
      if(projectAllResponse.errorCode==0){
        projectAllOuter = projectAllResponse.data;
        projectAllOuterChild = projectAllOuter.datas;
      }
      return projectAllOuterChild;
    }
    
    
    
    //获取体系列表数据
    Future<List<ProjectAllOuterChild>> getTixiList(int page,int cid) async{
      List<ProjectAllOuterChild> projectAllOuterChild = List<ProjectAllOuterChild>();
      ProjectAllOuter projectAllOuter;
      Dio dio = getDio();
      Response response = await dio.get(tixiList.replaceAll("PAGE", page.toString()).replaceAll("CID", cid.toString()));
      Map<String, dynamic> res = response.data;
      ProjectAllResponse projectAllResponse = ProjectAllResponse.fromJson(res);
      if(projectAllResponse.errorCode==0){
        projectAllOuter = projectAllResponse.data;
        projectAllOuterChild = projectAllOuter.datas;
      }
      return projectAllOuterChild;
    }
    
    //获取公众号信息
    Future<List<GzhChild>> getGzh() async{
      List<GzhChild> gzhChild = List<GzhChild>();
      Dio dio = getDio();
      Response response = await dio.get(gzh);
      Map<String, dynamic> res = response.data;
      GzhResponse gzhResponse = GzhResponse.fromJson(res);
      if(gzhResponse.errorCode==0){
        gzhChild = gzhResponse.data;
      }
      return gzhChild;
    }
    
    
    //获取公众号文章数据
    Future<List<ProjectAllOuterChild>> getGzhList(int page,int cid) async{
      List<ProjectAllOuterChild> projectAllOuterChild = List<ProjectAllOuterChild>();
      ProjectAllOuter projectAllOuter;
      Dio dio = getDio();
      Response response = await dio.get(gzhList.replaceAll("PAGE", page.toString()).replaceAll("CID", cid.toString()));
      Map<String, dynamic> res = response.data;
      ProjectAllResponse projectAllResponse = ProjectAllResponse.fromJson(res);
      if(projectAllResponse.errorCode==0){
        projectAllOuter = projectAllResponse.data;
        projectAllOuterChild = projectAllOuter.datas;
      }
      return projectAllOuterChild;
    }
    
    //查看我的收藏列表
    Future<MyCollect> getCollectList(int page) async{
      Dio dio = getDio();
      Response response = await dio.get(collectList.replaceAll("PAGE", page.toString()));
      Map<String,dynamic> res = response.data;
      MyCollectReponse myCollectReponse = MyCollectReponse.fromJson(res);
      if(myCollectReponse.errorCode==0){
        return myCollectReponse.data;
      }
      return null;
    }

[api]: https://links.jianshu.com/go?to=https%3A%2F%2Fwww.wanandroid.com%2Fblog%2Fshow%2F2
[Dio]: https://links.jianshu.com/go?to=https%3A%2F%2Fgithub.com%2Fflutterchina%2Fdio%2Fblob%2Fmaster%2FREADME-ZH.md
[dio_cookie_manager]: https://links.jianshu.com/go?to=https%3A%2F%2Fpub.dev%2Fpackages%2Fdio_cookie_manager
[path_provider]: https://links.jianshu.com/go?to=https%3A%2F%2Fpub.dev%2Fpackages%2Fpath_provider
[provider]: https://links.jianshu.com/go?to=https%3A%2F%2Fpub.dev%2Fpackages%2Fprovider
[shared_preferences]: https://links.jianshu.com/go?to=https%3A%2F%2Fpub.dev%2Fpackages%2Fshared_preferences