At this time I'm having trouble writing java code. The concept in this program is when I fill in the NIK field and press the get button, the name (FIELD NAME) will appear automatically based on the data from database

Database Structure

[Application View] (https://i.stack.imgur.com/x06Vy.png)

Error when i click get button

java.lang.illegalStateException : Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $

Get Button

btnGet.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        NikKry = etNik.getText().toString();
        getNama();
    }
});
private void getNama(){
    APIRequestData armNama = RetroMaster.konekRetrofit().create(APIRequestData.class);
    Call<DataMaster> tampilNama = armNama.ardGetNama(NikKry);

    tampilNama.enqueue(new Callback<DataMaster>() {
        @Override
        public void onResponse(Call<DataMaster> call, Response<DataMaster> response) {
            if (response.isSuccessful()){
                etNama.setText(response.body().getNAMA());
            }
        }
        @Override
        public void onFailure(Call<DataMaster> call, Throwable t) {
            Toast.makeText(TambahActivity.this, "Gagal " t.getMessage(), Toast.LENGTH_SHORT).show();
        }
    });
}

Data Master

package com.example.crudoracle.Model;
public class DataMaster {
    private String NIK;
    private String NAMA;
    
    public String getNIK() {

        return NIK;
    }
    public void setNIK(String NIK) {

        this.NIK = NIK;
    }
    public String getNAMA() {

        return NAMA;
    }
    public void setNAMA(String NAMA) {

        this.NAMA = NAMA;
    }
}

API request

@FormUrlEncoded
@POST("getnama.php")
Call<DataMaster> ardGetNama(
        @Field("NIK") String NIK
);

Php file

<?php
include ("koneksi.php");
    $NIK = $_POST['NIK'];
    $query = "SELECT NAMA FROM MASTER_KRY WHERE NIK = '$NIK'";
    $eksekusi = oci_parse($conn, $query);
    $cek = oci_execute($eksekusi);
        $response = array();
        while($ambil = oci_fetch_object($eksekusi)){
            $F["NAMA"] = $ambil->NAMA;
            array_push($response, $F);
        }
echo json_encode($response);
oci_close($conn);
?>

Postman response

[{"NAMA":"Alfian U"}]

CodePudding user response：

Make this change in your data class :

    package com.example.crudoracle.Model;

import javax.annotation.Generated;
import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

@Generated("jsonschema2pojo")
public class DataMaster {

@SerializedName("NAMA")
@Expose
private String nama;

public String getNama() {
return nama;
}

public void setNama(String nama) {
this.nama = nama;
}

}

Also make this changes in onClick of Get button :

btnGet.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        NikKry = etNik.getText().toString();
        getNama();
    }
});
private void getNama(){
    APIRequestData armNama = RetroMaster.konekRetrofit().create(APIRequestData.class);
    Call<DataMaster> tampilNama = armNama.ardGetNama(NikKry);

    tampilNama.enqueue(new Callback<List<DataMaster>>() {
        @Override
        public void onResponse(Call<List<DataMaster>> call, Response<List<DataMaster>> response) {
            if (response.isSuccessful()){
                etNama.setText(response.body()[0].getNAMA());
            }
        }
        @Override
        public void onFailure(Call<List<DataMaster>> call, Throwable t) {
            Toast.makeText(TambahActivity.this, "Gagal " t.getMessage(), Toast.LENGTH_SHORT).show();
        }
    });
}

Also make change in this :

@FormUrlEncoded
@POST("getnama.php")
Call<List<DataMaster>> ardGetNama(
        @Field("NIK") String NIK
);