Flutter GetX的MVC框架使用

一、网络请求封装

创建ApiService用于网络请求数据。

import 'dart:convert';
import 'package:dio/dio.dart';
//model
import 'package:flutter_getx_example/GetXApiDataExample/MovieModule/Models/MovieModel.dart';

class ApiService {
//返回类型是MovieModel类型的数组
  static Future<List<MovieModel>> fetchMovie() async { 
    var response = await Dio().get("http://apis.juhe.cn/fapig/douyin/billboard?type=hot_video&size=50&key=9eb8ac7020d9bea6048db1f4c6b6d028");
    if (response.statusCode == 200) {
      var jsonString = response.data['result'];
      return movieModelFromJson(json.encode(response.data["result"]));
    }
  }

}

二、定义模型类用于数据转模型

// To parse this JSON data, do
//
//     final movieModel = movieModelFromJson(jsonString);

import 'dart:convert';

List<MovieModel> movieModelFromJson(String str) => List<MovieModel>.from(json.decode(str).map((x) => MovieModel.fromJson(x)));

String movieModelToJson(List<MovieModel> data) => json.encode(List<dynamic>.from(data.map((x) => x.toJson())));

class MovieModel {
  MovieModel({
    this.title,
    this.shareUrl,
    this.author,
    this.itemCover,
    this.hotValue,
    this.hotWords,
    this.playCount,
    this.diggCount,
    this.commentCount,
  });

  String title;
  String shareUrl;
  String author;
  String itemCover;
  int hotValue;
  String hotWords;
  int playCount;
  int diggCount;
  int commentCount;

  factory MovieModel.fromJson(Map<String, dynamic> json) => MovieModel(
    title: json["title"],
    shareUrl: json["share_url"],
    author: json["author"],
    itemCover: json["item_cover"],
    hotValue: json["hot_value"],
    hotWords: json["hot_words"],
    playCount: json["play_count"],
    diggCount: json["digg_count"],
    commentCount: json["comment_count"],
  );

  Map<String, dynamic> toJson() => {
    "title": title,
    "share_url": shareUrl,
    "author": author,
    "item_cover": itemCover,
    "hot_value": hotValue,
    "hot_words": hotWords,
    "play_count": playCount,
    "digg_count": diggCount,
    "comment_count": commentCount,
  };
}

三、Controller控制器对数据进行处理

对请求回的数据转化成model，并且在请求前增加loading，结束后endLoading。

import 'package:flutter_getx_example/GetXApiDataExample/ApiModule/ApiService.dart';
import 'package:flutter_getx_example/GetXApiDataExample/MovieModule/Models/MovieModel.dart';
import 'package:get/get.dart';

class MovieController extends GetxController {

  var isLoading = true.obs;
  // ignore: deprecated_member_use
  var movieList = List<MovieModel>().obs;

  @override
  void onInit() {
    // TODO: implement onInit
    fetchMovie();
    super.onInit();
  }

  void fetchMovie() async {
    try {
      isLoading(true);
      var movie = await ApiService.fetchMovie();
      if (movie != null) {
        movieList.assignAll(movie);
      }
    } finally {
      isLoading(false);
    }
  }
}

四、View视图层展示列表数据

在view层获取请求到的数据，然后填充数据。
这里有使用到Get.put(MovieController())获取controller，然后使用obx监控movieList的改变。

import 'package:flutter/material.dart';
import 'package:flutter_getx_example/GetXApiDataExample/MovieModule/Controller/MovieController.dart';
import 'package:get/get.dart';

class MovieListView extends StatelessWidget {

  final MovieController movieController = Get.put(MovieController());

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Movie"),
      ),
      body: Obx(() {
        if (movieController.isLoading.value) {
          return Center(
            child: CircularProgressIndicator(),
          );
        } else {
          return ListView.builder(
            itemCount: movieController.movieList.length,
            itemBuilder: (context, index) {
              return Column(
                children: [
                  Row(
                    children: [
                      Container(
                        width: 100,
                        height: 120,
                        margin: EdgeInsets.all(10),
                        child: ClipRRect(
                          borderRadius: BorderRadius.circular(6),
                          child: Image.network(
                            movieController.movieList[index].itemCover,
                            width: 150,
                            height: 100,
                            fit: BoxFit.fill,
                            // color: Colors.orange,
                            // colorBlendMode: BlendMode.color,
                          ),
                        ),
                      ),
                      Flexible(
                        child: Column(
                          mainAxisAlignment: MainAxisAlignment.start,
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Text(
                              movieController.movieList[index].author,
                              style: TextStyle(
                                color: Colors.black45,
                                fontSize: 16
                              ),
                            )
                          ],
                        ),
                      ),
                    ],
                  ),
                  Container(
                    color: Colors.grey.shade300,
                    height: 2,
                  )
                ],
              );
            },
          );
        }
      }),
    );
  }