Retrofit2.0入门学习

添加依赖

implementation 'com.squareup.retrofit2:retrofit:2.1.0'
implementation 'com.squareup.retrofit2:converter-gson:2.1.0'//下方有说明并不是我们的google.gson

说明
https://www.zhaoapi.cn/product/getProductCatagory?cid=2
baseUrl="https://www.zhaoapi.cn/"

接口部分

product/getProductCatagory

第一种post请求

注解@FieldMap

第一步定义一个接口

public interface ApiUrl{
①post请求+

//这里是添加headers

@Headers("Cache-Control: max-age=640000")

@FormUrlEncoded@POST("product/getProductCatagory")Call<Bean> getData(@FieldMap Map<String,Object> params);

 

//②Body
/*@POST("product/getProductCatagory")
Call<Bean> getData(@Body() ProductBean bean );*/

//③Filed
/*@POST("product/getProductCatagory")
Call<Bean> getData(@Query("cid") String cid);*/

get请求

//④QueryMap
/*  @GET("product/getProductCatagory?")
Call<Bean> getData(@QueryMap Map<String,Object> params);*/

//⑤query
/* @GET("product/getProductCatagory?")
Call<Bean> getData(@Query("cid") int cid);*/

以上在activity中调用方法一样

}

我的Bean类

public class Bean {

/**
* msg : 获取子分类成功
* code : 0
* data : [{"cid":"2","list":[{"icon":"http://120.27.23.105/images/icon.png","name":"手机","pcid":6,"pscid":39},{"icon":"http://120.27.23.105/images/icon.png","name":"笔记本","pcid":6,"pscid":40},{"icon":"http://120.27.23.105/images/icon.png","name":"平板电脑","pcid":6,"pscid":41},{"icon":"http://120.27.23.105/images/icon.png","name":"游戏机","pcid":6,"pscid":42},{"icon":"http://120.27.23.105/images/icon.png","name":"摄影摄像","pcid":6,"pscid":43}],"name":"数码家电","pcid":"6"},{"cid":"2","list":[{"icon":"http://120.27.23.105/images/icon.png","name":"男表","pcid":7,"pscid":44},{"icon":"http://120.27.23.105/images/icon.png","name":"女表","pcid":7,"pscid":45},{"icon":"http://120.27.23.105/images/icon.png","name":"儿童手表","pcid":7,"pscid":46},{"icon":"http://120.27.23.105/images/icon.png","name":"运动手表","pcid":7,"pscid":47},{"icon":"http://120.27.23.105/images/icon.png","name":"电子表","pcid":7,"pscid":48},{"icon":"http://120.27.23.105/images/icon.png","name":"情侣表","pcid":7,"pscid":49},{"icon":"http://120.27.23.105/images/icon.png","name":"石英表","pcid":7,"pscid":50},{"icon":"http://120.27.23.105/images/icon.png","name":"机械表","pcid":7,"pscid":51}],"name":"钟表","pcid":"7"},{"cid":"2","list":[{"icon":"http://120.27.23.105/images/icon.png","name":"奢品箱包","pcid":8,"pscid":52},{"icon":"http://120.27.23.105/images/icon.png","name":"珠宝饰品","pcid":8,"pscid":53},{"icon":"http://120.27.23.105/images/icon.png","name":"运动户外","pcid":8,"pscid":54}],"name":"服饰奢品","pcid":"8"},{"cid":"2","list":[{"icon":"http://120.27.23.105/images/icon.png","name":"面部护肤","pcid":9,"pscid":55},{"icon":"http://120.27.23.105/images/icon.png","name":"洗发护发","pcid":9,"pscid":56},{"icon":"http://120.27.23.105/images/icon.png","name":"身体护理","pcid":9,"pscid":57},{"icon":"http://120.27.23.105/images/icon.png","name":"口腔护理","pcid":9,"pscid":58},{"icon":"http://120.27.23.105/images/icon.png","name":"女性护理","pcid":9,"pscid":59},{"icon":"http://120.27.23.105/images/icon.png","name":"清洁用品","pcid":9,"pscid":60}],"name":"美妆个护","pcid":"9"}]
*/

public String msg;
public String code;
public List<DataBean> data;

public static class DataBean {
/**
* cid : 2
* list : [{"icon":"http://120.27.23.105/images/icon.png","name":"手机","pcid":6,"pscid":39},{"icon":"http://120.27.23.105/images/icon.png","name":"笔记本","pcid":6,"pscid":40},{"icon":"http://120.27.23.105/images/icon.png","name":"平板电脑","pcid":6,"pscid":41},{"icon":"http://120.27.23.105/images/icon.png","name":"游戏机","pcid":6,"pscid":42},{"icon":"http://120.27.23.105/images/icon.png","name":"摄影摄像","pcid":6,"pscid":43}]
* name : 数码家电
* pcid : 6
*/

public String cid;
public String name;
public String pcid;
public List<ListBean> list;

public static class ListBean {
/**
* icon : http://120.27.23.105/images/icon.png * name : 手机
* pcid : 6
* pscid : 39
*/

public String icon;
public String name;
public int pcid;
public int pscid;
}
}
}

第二步activity写法

①Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Api.url)
.addConverterFactory(GsonConverterFactory.create())//使用gson解析时使用
// 添加源implementation 'com.squareup.retrofit2:converter-gson:2.1.0'
.build();

ApiUrl apiUrl = retrofit.create(ApiUrl.class);

②

Map<String, Object> map = new HashMap<>();

map.put("cid",1);
retrofit2.Call<Bean> data = apiUrl.getData(map)

异步请求

data.enqueue(new Callback<Bean>() {
@Override
public void onResponse(retrofit2.Call<Bean> call, retrofit2.Response<Bean> response) {
List<Bean.DataBean> data1 = response.body().data;

tv.setText("=="+data1.get(0).name);
Toast.makeText(MainActivity.this, data1.get(0).name+"===", Toast.LENGTH_SHORT).show();
}

@Override
public void onFailure(retrofit2.Call<Bean> call, Throwable t) {
tv.setText("==请求失败");
}
});

}