Retrofit2.0的简单使用 (包含Gson)

本文主要是介绍Retrofit2.0的简单使用 (包含Gson)，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

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"}]
}
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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>() {@Overridepublic 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();}}}@Overridepublic 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>() {@Overridepublic 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);}}@Overridepublic void onFailure(Call<SpecRankBean> call, Throwable t) {}});
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