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：

      

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"        }    ]}
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   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);
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• 实例化Retrofit：

  Retrofit retrofit = new Retrofit.Builder()         .baseUrl(Constant.BASE_URL)         .build();
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• 通过Retrofit实例创建接口服务对象

  QueryRankService service = retrofit.create(QueryRankService.class);
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• 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) {     } });
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   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：

  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;        }    }}
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   5. 使用Gson解析

• 定义接口（封装URL地址和数据请求） ：

  @GET("rank_querySpecRankByUniv")    Call<SpecRankBean> querySpecRankByUnivUseGson(            @Query("university.univCode") String univCode,            @Query("page") int page);
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• 实例化Retrofit：

  Retrofit retrofit = new Retrofit.Builder()                 .baseUrl(Constant.BASE_URL)                 .addConverterFactory(GsonConverterFactory.create())                 .build();
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• 将请求的数据可以直接转换为我们的Bean，通过各种get方法获取我们想要的数据：

  call.enqueue(new Callback<SpecRankBean>() {     @Override     public void onResponse(Call<SpecRankBean> call, Response<SpecRankBean> response) {         if(response.isSuccessful()){             SpecRankBean bean = response.body();             List<SpecRankBean.RowsBean> list = bean.getRows();             String result = "";             for (SpecRankBean.RowsBean rowsBean : list) {                 result += rowsBean.getUnivName() + rowsBean.getSpecName() + "\n";             }             mTextView.setText(result);         }     }     @Override     public void onFailure(Call<SpecRankBean> call, Throwable t) {     } });
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