Retrofit2.0的简单使用 (包含Gson)

http://blog.csdn.net/bskfnvjtlyzmv867/article/details/70667041 (转)

参考博客：

Retrofit2使用（非常简洁易懂）

实现效果：

enter image description here

使用姿势：

1. 使用教程

添加依赖
- compile ‘com.squareup.retrofit2:retrofit:2.2.0’
- compile ‘com.squareup.retrofit2:converter-gson:2.2.0’
AndroidStudio添加Gson插件——GsonFormat

2. 使用API

所用api：http://www.mrsorrow.xin/pro/rank_querySpecRankByUniv?university.univCode=10280&page=1
功能：根据高校代码进行学科专业类排名

返回json如下：

{
    "rows": [
        {
            "id": 1893,
            "specCode": "",
            "specName": "冶金工程类",
            "univCode": "10280",
            "univName": "上海大学",
            "univRank": "5",
            "univScore": "78"
        },
        {
            "id": 328,
            "specCode": "0303",
            "specName": "社会学类",
            "univCode": "10280",
            "univName": "上海大学",
            "univRank": "8",
            "univScore": "77"
        },
        {
            "id": 828,
            "specCode": "0503",
            "specName": "新闻传播学类",
            "univCode": "10280",
            "univName": "上海大学",
            "univRank": "10",
            "univScore": "77"
        },
        {
            "id": 3959,
            "specCode": "1303",
            "specName": "戏剧与影视学类",
            "univCode": "10280",
            "univName": "上海大学",
            "univRank": "4",
            "univScore": "77"
        },
        {
            "id": 396,
            "specCode": "0305",
            "specName": "马克思主义理论类",
            "univCode": "10280",
            "univName": "上海大学",
            "univRank": "17",
            "univScore": "76"
        }
    ]
}

3. 入门使用Retrofit

定义接口（封装URL地址和数据请求）：

@GET("rank_querySpecRankByUniv")
Call<ResponseBody> querySpecRankByUniv(
        @Query("university.univCode") String univCode,
        @Query("page") int page);

实例化Retrofit：

Retrofit retrofit = new Retrofit.Builder()
         .baseUrl(Constant.BASE_URL)
         .build();

通过Retrofit实例创建接口服务对象

QueryRankService service = retrofit.create(QueryRankService.class);

ResponseBody中存放着我们请求的数据，调用response.body().string()转化为字符串：

 Call<ResponseBody> call = service.querySpecRankByUniv("10280", 1);
 call.enqueue(new Callback<ResponseBody>() {
     @Override
     public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
         if(response.isSuccessful()){
             try {
                 String result = response.body().string();
                 mTextView.setText(result);
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     }

     @Override
     public void onFailure(Call<ResponseBody> call, Throwable t) {

     }
 });

4. 使用GsonFormat生成Bean

新建Bean类——SpecRank.java
类中右键Generate–》GsonFormat，将json样例拷贝进AS，点击ok即可

生成如下：

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package com.ping.retrofit2.beans;

import java.util.List;

/**
 * SpecRankBean
 * Created by Mr.sorrow on 2017/4/24.
 */

public class SpecRankBean {

    private List<RowsBean> rows;

    public List<RowsBean> getRows() {
        return rows;
    }

    public void setRows(List<RowsBean> rows) {
        this.rows = rows;
    }

    public static class RowsBean {
        /**
         * id : 1893
         * specCode :
         * specName : 冶金工程类
         * univCode : 10280
         * univName : 上海大学
         * univRank : 5
         * univScore : 78
         */

        private int id;
        private String specCode;
        private String specName;
        private String univCode;
        private String univName;
        private String univRank;
        private String univScore;

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getSpecCode() {
            return specCode;
        }

        public void setSpecCode(String specCode) {
            this.specCode = specCode;
        }

        public String getSpecName() {
            return specName;
        }

        public void setSpecName(String specName) {
            this.specName = specName;
        }

        public String getUnivCode() {
            return univCode;
        }

        public void setUnivCode(String univCode) {
            this.univCode = univCode;
        }

        public String getUnivName() {
            return univName;
        }

        public void setUnivName(String univName) {
            this.univName = univName;
        }

        public String getUnivRank() {
            return univRank;
        }

        public void setUnivRank(String univRank) {
            this.univRank = univRank;
        }

        public String getUnivScore() {
            return univScore;
        }

        public void setUnivScore(String univScore) {
            this.univScore = univScore;
        }
    }
}

5. 使用Gson解析