为什么在使用 retrofit 时总是将空值插入 api？

Question

我在使用 retrofit 将数据值发布到 api 时遇到问题，我总是得到空的 Object Created.for 例如，{“S_ID”“地址”“149F391BZ” "}并且我能够成功获取现有值。我认为 POJO 是正确的，因为我能够获取所有数据。

主活动文件

package com.devesh.apioperationsretrofit;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;

import com.devesh.apioperationsretrofit.databinding.ActivityMainBinding;
import com.devesh.apioperationsretrofit.userModel.Post;
import com.devesh.apioperationsretrofit.userModel.Posts;
import com.devesh.apioperationsretrofit.userModel.data;

import java.util.ArrayList;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainActivity extends AppCompatActivity {
    private ActivityMainBinding binding;
    String name, email, addr;
    APIinterface apIinterface;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = ActivityMainBinding.inflate(getLayoutInflater());
        View view = binding.getRoot();
        setContentView(view);

        apIinterface = ApiClient.getClient().create(APIinterface.class);

        binding.insertButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                PostUserData();
                //Toast.makeText(MainActivity.this, name + email + addr, Toast.LENGTH_SHORT).show();




            }
        });
        binding.updateButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

        binding.deleteButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

    }
    public void getUserData(){

        Call<data> call = apIinterface.getUsers();//getTODOS

        call.enqueue(new Callback<data>(){

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

               try {
                   Log.d("DAGG", "onResponse: " +response.body().getPosts1().getStatus().toString());
                   if(response != null){
                       if (response.body().getPosts1().getStatus().toString().equals("200")){
                           binding.usernameEdt.setText(response.body().getPosts1().getPost1().get(5).getName());
                           binding.emailEdt.setText(response.body().getPosts1().getPost1().get(5).getEmail());
                           binding.addressEdt.setText(response.body().getPosts1().getPost1().get(5).getAddr());
                       }
                   }
               }catch (Exception e){
                   Log.d("DAGG", "onResponse: " +e);
               }
            }

            @Override
            public void onFailure(Call<data> call, Throwable t) {
                Log.d("DAGG", "onResponse: " + t.getLocalizedMessage());
            }
        });

    }

    public  void PostUserData(){
        Post post = new Post("Devesh","Nashik","dev123@gmail.com");
        ArrayList<Post> post1 = new ArrayList<>();
        post1.add(post);

        Posts posts = new Posts("200",post1);

        data data = new data(posts);

        Call<Post> postCall = apIinterface.postUser(post);
        postCall.enqueue(new Callback<Post>() {
            @Override
            public void onResponse(Call<Post> call, Response<Post> response) {
                Log.d("DAGG", "onResponse: "+ response.body());
            }

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

            }
        });
    }

}

Api接口文件

package com.devesh.apioperationsretrofit;

import com.devesh.apioperationsretrofit.userModel.Post;
import com.devesh.apioperationsretrofit.userModel.Posts;
import com.devesh.apioperationsretrofit.userModel.data;

import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.GET;
import retrofit2.http.POST;

public interface APIinterface {

    @GET("select_test.php")
    Call <data>  getUsers();

    @POST("insert_test.php")
    Call <Post> postUser(@Body Post post);
}

ApiClient 文件

package com.devesh.apioperationsretrofit;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.converter.scalars.ScalarsConverterFactory;

public class ApiClient {
    private static final String BASE_URL = "https://codingseekho.in/APP/WS_API/";
    private static Retrofit retrofit = null;

    public static Retrofit getClient(){
        if (retrofit == null){

            retrofit = new Retrofit.Builder()
                    .baseUrl(BASE_URL)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}