EOF retrofit

<?php 
require_once "conn.php";


$pg_qry="SELECT login FROM register WHERE id=62";
$result=pg_query($conn,$pg_qry);
$wiersz = pg_fetch_array( $result);

if($result)
{
	
	
	json_encode($wiersz['login']);
 
}
else
{
	json_encode ("getdata not success");
}

pg_close();

?>

public class MainActivity extends AppCompatActivity {
    private Post logp;
    EditText log, pass;
    Button przycisk;
    TextView mResponseTv;
    private APIService mAPIService;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        log = (EditText) findViewById(R.id.loginetid);
        pass = (EditText) findViewById(R.id.passwordetid);
        mResponseTv = (TextView) findViewById(R.id.napisid);
        Button submitBtn = (Button) findViewById(R.id.button);
        mAPIService = ApiUtils.getAPIService();

        submitBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String login = log.getText().toString().trim();
                String password = pass.getText().toString().trim();
                if (!TextUtils.isEmpty(login) && !TextUtils.isEmpty(password)) {
                    sendPost(login, password);
                }
            }
        });

    }


    public void sendPost(String login, String password) {
        Call<Post> call = mAPIService.savePost(login, password, 2);
        call.enqueue(new Callback<Post>() {


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

                if (response.isSuccessful()) {
                    showResponse(response.body().toString());
                    Log.i("wyslane", "post submitted to API." + response.body().toString());

                }
            }

            @Override
            public void onFailure(Call<Post> call, Throwable t) {
                Log.e("blad", "Unable to submit post to API." + t);
            }
        });
    }

   public void getData() {

        mAPIService.getUserInfo().enqueue(new Callback<Post>() {
            @Override
            public void onResponse(@NonNull Call<Post> call, @NonNull Response<Post> response) {

                showResponse(response.body().getLogin());
                Log.i("wyslane", "getting data success." + response.body().toString());
            }

            @Override
            public void onFailure(@NonNull Call<Post> call, @NonNull Throwable t) {
                Log.e("blad", "getting data failed." + t);

            }
        });
    }

    public void readBt(View v) {
        getData();
    }


    public void showResponse(String response) {
        if (mResponseTv.getVisibility() == View.GONE) {
            mResponseTv.setVisibility(View.VISIBLE);
        }
        mResponseTv.setText(response);
    }


}

public class Post {

    @SerializedName("login")
    @Expose
    private String login;

    @SerializedName("password")
    @Expose
    private String password;


    @SerializedName("id")
    @Expose
    private Integer id;

    public String getLogin() {
        return login;
    }

    public void setLogin(String login) {
        this.login = login;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }


    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    @Override
    public String toString() {
        return "Post{" +
                "login='" + login + '\'' +
                ", password='" + password + '\'' +
                ", id=" + id +
                '}';
    }


}

package com.example.ad.retrofittest;

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

/**
 * Created by ad on 2018-01-16.
 */

public class RetrofitClient {

    private static Retrofit retrofit = null;

    public static Retrofit getClient(String baseUrl) {
        if (retrofit==null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(baseUrl)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}

package com.example.ad.retrofittest;

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

/**
 * Created by ad on 2018-01-16.
 */

public class RetrofitClient {

    private static Retrofit retrofit = null;

    public static Retrofit getClient(String baseUrl) {
        if (retrofit==null) {
            retrofit = new Retrofit.Builder()
                    .baseUrl(baseUrl)
                    .addConverterFactory(GsonConverterFactory.create())
                    .build();
        }
        return retrofit;
    }
}

package com.example.ad.retrofittest;

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

/**
 * Created by ad on 2018-01-16.
 */

public interface APIService {


    @GET("login.php")
    Call<Post> getUserInfo();

    @POST("register.php")
    @FormUrlEncoded
    Call<Post> savePost(@Field("login") String login,
                              @Field("password") String password,
                              @Field("id") long id);
}