Retrofit2（Android）-如何通过POST方法发送表单数据

我设法找到一个解决方案，结果比我想象的要容易得多。

只需创建一个名为AuthRequest的类，如下所示：

public class AuthRequest {

    private static final String TAG = "Auth";
    private static final String EMAIL = "email";
    private static final String PASSWORD = "pass";


    //creates a json-format string
    public static String createAuthJsonString(){

        String info = "{\"auth\":{\"email\":\""+EMAIL+"\",\"password\":\""+PASSWORD+"\"}}";


        Log.i(TAG,info);

        return info;
    }

}

只需将@FormUrlEncoded添加到@Post并将@Field键和值放在方法调用中：

@FormUrlEncoded
@POST("ys")//endpoint
Call<YList> getY(@Field("info") String info);


// Connection url.
public static final YService serviceY = new Retrofit.Builder()
        .baseUrl("http://example.com.br/api/x/")
        .addConverterFactory(GsonConverterFactory.create())
        .build()
        .create(YService.class);

使用getY（）方法：

    final YService yService = YService.serviceY;
    //...
    yService.getY(AuthRequest.createAuthJsonString()).enqueue(new 
        Callback<YList>() {

        @Override
        public void onResponse(Call<YList> call, Response<YList> response) {

            if (response.isSuccessful()) {
              //...

            } else {

               //...
            }
        }

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

            //...

        }


    });



}

完美地从json返回了YList。