Wsrtjtyk

Firstly I have 3 spinners(ConverterNo., ZoneNo., CodeID). So, populating ConverterNo. first and based on the values from 1st spinner 2nd spinner (ZoneNo.) should be populated and so on. Therefore, I used onItemSelectedListener until so far. But it isn't helping or I am lost somewhere in the middle.

This is the code leading to populate the Spinners.

ERROR: method getServerResponse2 in class ListViewReqDao cannot
be applied to given types; required: no arguments found: int reason:
actual and formal argument lists differ in length

Note: The location of the error is in selectcode.java class inside the method getData1() on line List<Request> list1 = listViewReqDao.getServerResponse2(list_item.getSelectedItemPosition());

selectcode.java

package com.example.app;



import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.Spinner;

import android.widget.Toast;



import java.util.ArrayList;

import java.util.Collections;

import java.util.List;



import retrofit2.Call;

import retrofit2.Callback;

import retrofit2.Response;

import retrofit2.Retrofit;

import retrofit2.converter.gson.GsonConverterFactory;





public class selectcode extends AppCompatActivity implements AdapterView.OnItemSelectedListener {



    ListView listView;



    ListViewReqDao listViewReqDao;

    Request requestdata;

    ArrayList<String> namess;

    ArrayList<String> meth;

    ArrayList<String> Three;

    String Name;

    Spinner list_item,two,three;

    List<Request> requests;



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_selectcode);

        list_item = findViewById(R.id.selectconverter);

        two = findViewById(R.id.selectzone);

        three = findViewById(R.id.selectcode);

        getData();

        getData1();

        getData2();

    }



    private void getData() {

        Retrofit retrofit = new Retrofit.Builder()

                .baseUrl(Api.BASE_URL)

                .addConverterFactory(GsonConverterFactory.create()) //Here we are using the GsonConverterFactory to directly convert json data to object

                .build();

        Api api = retrofit.create(Api.class);

        Call<ListViewReqDao> call = api.getdata();

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

            @Override

            public void onResponse(Call<ListViewReqDao> call, Response<ListViewReqDao> response) {



                if (response.isSuccessful()) {

                    listViewReqDao = response.body();



                    final String items = new String[listViewReqDao.getServerResponse1().size()];

                    for (int i = 0; i < listViewReqDao.getServerResponse1().size(); i++) {

                        items[i] = listViewReqDao.getServerResponse1().get(i).getConverternumber();

                    }

                    final ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item, items);

                    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

                    list_item.setAdapter(dataAdapter);

                    list_item.getSelectedItemPosition();

                }



                //Creating an String array for the ListView

            }



            @Override

            public void onFailure(Call<ListViewReqDao> call, Throwable t) {

                Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_SHORT).show();

            }

        });



    }



    private void getData1() {



        Retrofit retrofit = new Retrofit.Builder()

                .baseUrl(Api.BASE_URL)

                .addConverterFactory(GsonConverterFactory.create()) //Here we are using the GsonConverterFactory to directly convert json data to object

                .build();

        Api api = retrofit.create(Api.class);

        Call<ListViewReqDao> call = api.getdata1();

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



            @Override

            public void onResponse(Call<ListViewReqDao> call, Response<ListViewReqDao> response) {



                if (response.isSuccessful()) {

                    listViewReqDao = response.body();



**// ERROR OCCURS IN THE BELOW LINE**



                    List<Request> list1 = listViewReqDao.getServerResponse2(list_item.getSelectedItemPosition());



                    final String items1 = new String[listViewReqDao.getServerResponse2().size()];

                    for (int j = 0; j < listViewReqDao.getServerResponse2().size(); j++) {

                        items1[j] = listViewReqDao.getServerResponse2().get(j).getZonenumber();

                    }

                    ArrayAdapter<String> dataAdapter1 = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item, items1);

                    dataAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

                    two.setAdapter(dataAdapter1);

//                    dataAdapter1.notifyDataSetChanged();



                }

            }



            @Override

            public void onFailure(Call<ListViewReqDao> call, Throwable t) {



            }

        });



    }



    private void getData2(){



        Retrofit retrofit = new Retrofit.Builder()

                .baseUrl(Api.BASE_URL)

                .addConverterFactory(GsonConverterFactory.create()) //Here we are using the GsonConverterFactory to directly convert json data to object

                .build();

        Api api = retrofit.create(Api.class);

        Call<ListViewReqDao> call = api.getdata2();

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





            @Override

            public void onResponse(Call<ListViewReqDao> call, Response<ListViewReqDao> response) {



                if (response.isSuccessful()) {

                    listViewReqDao = response.body();



                    String items2 = new String[listViewReqDao.getServerResponse3().size()];

                    for (int k = 0; k < listViewReqDao.getServerResponse3().size(); k++) {

                        items2[k] = listViewReqDao.getServerResponse3().get(k).getCodeid();

                    }

                    ArrayAdapter<String> dataAdapter2 = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item, items2);

                    dataAdapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

                    // attaching data adapter to spinner

                    three.setAdapter(dataAdapter2);



                }

            }



            @Override

            public void onFailure(Call<ListViewReqDao> call, Throwable t) {



            }

        });

    }







    @Override

    public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

//        String sSelected = parent.getItemAtPosition(position).toString();

//        Toast.makeText(this,sSelected,Toast.LENGTH_SHORT).show();



    }



    @Override

    public void onNothingSelected(AdapterView<?> parent) {



    }



}

ListViewReqDao.java

package com.example.app;



import com.google.gson.annotations.Expose;

import com.google.gson.annotations.SerializedName;



import java.util.List;



public class ListViewReqDao {

    @SerializedName("server_response1")

    @Expose

    private List<Request> serverResponse1 = null;



    @SerializedName("server_response2")

    @Expose

    private  List<Request> serverResponse2 = null;



    @SerializedName("server_response3")

    @Expose

    private List<Request> serverResponse3 = null;







    public List<Request> getServerResponse1() {

        return serverResponse1;

    }



    public void setServerResponse1(List<Request> serverResponse1) {

        this.serverResponse1 = serverResponse1;

    }



    public List<Request> getServerResponse2() {

        return serverResponse2;

    }



    public void setServerResponse2(List<Request> serverResponse2) {

        this.serverResponse2 = serverResponse2;

    }



    public List<Request> getServerResponse3() {

        return serverResponse3;

    }



    public void setServerResponse3(List<Request> serverResponse3) {

        this.serverResponse3 = serverResponse3;

    }



}

Request.java

package com.example.app;

import com.google.gson.annotations.Expose;

import com.google.gson.annotations.SerializedName;



public class Request {



    @SerializedName("converternumber")

    @Expose

    private String converternumber;

    @SerializedName("zonenumber")

    @Expose

    private String zonenumber;

    @SerializedName("codeid")

    @Expose

    private String codeid;



    public String getConverternumber() {

        return converternumber;

    }



    public void setConverternumber(String converternumber) {

        this.converternumber = converternumber;

    }



    public String getZonenumber() {

        return zonenumber;

    }



    public void setZonenumber(String zonenumber) {

        this.zonenumber = zonenumber;

    }



    public String getCodeid() {

        return codeid;

    }



    public void setCodeid(String codeid) {

        this.codeid = codeid;

    }



}

Api.java

package com.example.app;



import java.util.List;



import retrofit2.Call;

import retrofit2.http.GET;



public interface Api {



    String BASE_URL = "http://......url...../app1/";



    @GET("getconverterjson.php")

    Call<ListViewReqDao> getdata();



    @GET("getzonejson.php")

    Call<ListViewReqDao> getdata1();



    @GET("getcodejson.php")

    Call<ListViewReqDao> getdata2();

}

One of the JSON file among three Json file:

getzonejson.php (This is for loading 2nd spinner)

<?php

$db_name="app1";

$mysql_user="root";

$server_name="localhost";



// require "connection.php";

$connectionn=mysqli_connect($server_name,$mysql_user,"",$db_name);

// if(isset($_GET['converternumber']) && isset($_POST['zonenumber']) && isset($_POST['codeid']))

// {

$n_converternumber= 'converternumber';

$n_zonenumber= ['zonenumber'];





$sql_query= "select zonenumber from addcode where converternumber like '$n_converternumber';";



$result= mysqli_query($connectionn,$sql_query);



$response= array();

// print_r($result);

while($roww=mysqli_fetch_array($result)){



  array_push($response,array("zonenumber"=>$roww[0]));



}

echo json_encode(array("server_response2"=>$response));

mysqli_close($connectionn);







?>

You can use

int position 

that is method parameter instead of

int select = list_item.getSelectedItemPosition();

Edit 1:

Your code is not clear yet,but I think you did not use first spinner selected value. You load second spinner like first spinner. And you load third spinner like that also.

These are your initialize list codes

for (int i = 0; i < listViewReqDao.getServerResponse().size(); i++) {

    items[i] = listViewReqDao.getServerResponse().get(i).getConverternumber();

}



final String items1 = new String[listViewReqDao.getServerResponse().size()];

for (int j = 0; j < listViewReqDao.getServerResponse().size(); j++) {

    items1[j] = listViewReqDao.getServerResponse().get(j).getZonenumber();

}



String items2 = new String[listViewReqDao.getServerResponse().size()];

for (int k = 0; k < listViewReqDao.getServerResponse().size(); k++) {

    items2[k] = listViewReqDao.getServerResponse().get(k).getCodeid();

}

There is not any filtered. the three array is loaded same.
Your code must be like that for second spinner.

List<YourModel> yourModelZoneList = listViewReqDao.getZonesByConverterNumber(firstSpinner.getSelectedItemPosition());

final String items1 = new String[yourModelZoneList.size()];

for (int j = 0; j < yourModelZoneList.size(); j++) {

    items1[j] = yourModelZoneList.getZonenumber();

}

Also you must load third spinner list like second spinner.

List<YourModel> yourModelCodeIdList = listViewReqDao.getCodeIdsByZoneNummer(secondSpinner.getSelectedItemPosition());

final String items2 = new String[yourModelCodeIdList.size()];

for (int k = 0; k < yourModelCodeIdList.size(); k++) {

    items2[k] = yourModelCodeIdList.getCodeid();

}