如何使用retrofit去请求网络

引入:

compile 'com.google.code.gson:gson:2.8.0'
 compile 'com.squareup.retrofit2:retrofit:2.4.0'
 compile 'com.squareup.retrofit2:converter-gson:2.4.0'
 

因为retrofit已经包含了okhttp的库，所以就不要额外引入okhttp了

我们使用retrofit来请求:http://139.199.89.89/api/v1/books这样一个API

private void useRetrofit() {
 Retrofit retrofit = new Retrofit.Builder()
 .baseUrl("http://139.199.89.89") //设置网络请求的Url地址
 .addConverterFactory(GsonConverterFactory.create()) //设置数据解析器
 .build();
 BookService service = retrofit.create(BookService.class);
 Call call = service.getResult();

//3.发送请求
call.enqueue(new Callback() {
    @Override
    public void onResponse(Call call, Response response) {
        Log.d(TAG,"<<<< call, Throwable t) {

    }
});

}
 

我们要写一个service,叫BookService:

package com.pic.optimize.http;

import retrofit2.Call;
 import retrofit2.http.GET;
public interface BookService {
 @GET("/api/v1/books")
 Call getResult();
 }
 

然后要写json的解析实体BookResponse:

import java.util.ArrayList;

public class BookResponse {
 public ArrayList data;
 public int status;
 public String message;
 }
 

然后就在onResponse中就可以得到回调了

我们再写一个添加一本书的post的请求,url是http://139.199.89.89，服务端接收参数是

bookName和bookDescription:

import retrofit2.Call;
 import retrofit2.http.Field;
 import retrofit2.http.FormUrlEncoded;
 import retrofit2.http.POST;

public interface BookPostService {
 @POST("/api/v1/books")
 @FormUrlEncoded
 Call getResult(@Field("bookName") String name, @Field("bookDescription") String description);
 }
 

private void useRetrofit() {
 Retrofit retrofit = new Retrofit.Builder()
 .baseUrl("http://139.199.89.89") //设置网络请求的Url地址
 .addConverterFactory(GsonConverterFactory.create()) //设置数据解析器
 .build();
 BookPostService service = retrofit.create(BookPostService.class);
 Call call = service.getResult(mBookNameEdit.getText().toString(),mDescriptionEdit.getText().toString());

//3.发送请求
call.enqueue(new Callback() {
    @Override
    public void onResponse(Call call, Response response) {
        Log.d(TAG,"<<<< call, Throwable t) {

    }
});

}