Радиокнопка получает только проверенное радио в студии Android

В настоящее время я работаю над проектом и застрял на переключателе, который получает только проверенное радио в xml, я ищу много случаев, связанных с этой проблемой, и все еще сталкиваюсь с той же проблемой.

вот активность, которая поджаривает только проверенное радио в xml

package com.example.kapoyei.hatidtubiganapp;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.DatePickerDialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import com.example.kapoyei.hatidtubiganapp.helper.Http;
import com.example.kapoyei.hatidtubiganapp.helper.Network;

import org.json.JSONArray;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;
import java.util.Locale;

public class ClientActivity extends Activity implements View.OnClickListener {
    public static String jsonObject;
    SharedPreferences sharedPref;
    Intent i;

    Button btnLogout, btnBreakPoint;
    Spinner spnStation;
    ImageView btnReserve, btnStationList, btnPending, btnHistory;
    TextView txtSelectDate;
    EditText no_container;
    RadioGroup radioGroup;
    RadioButton radioButton;

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

        btnLogout = (Button) findViewById(R.id.btnLogout);
        btnReserve = (ImageView) findViewById(R.id.btnReserve);
        btnStationList = (ImageView) findViewById(R.id.btnStation);
        btnPending = (ImageView) findViewById(R.id.btnPending);
        btnHistory = (ImageView) findViewById(R.id.btnHistory);

        btnPending.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                i = new Intent(ClientActivity.this, PendingClientOrderActivity.class);
                startActivity(i);
            }
        });

        btnStationList.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                i = new Intent(ClientActivity.this, StationList.class);
                startActivity(i);
            }
        });

        btnReserve.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder builder = new AlertDialog.Builder(ClientActivity.this);
                LayoutInflater inflater = getLayoutInflater();
                view = inflater.inflate(R.layout.layout_dialog_reserve, null);

                spnStation = (Spinner) view.findViewById(R.id.spnStation);
                txtSelectDate = (TextView) view.findViewById(R.id.txtDate);
                no_container = (EditText) view.findViewById(R.id.etContainer);
                radioGroup = (RadioGroup) view.findViewById(R.id.radioGroup);
                radioButton = (RadioButton) view.findViewById(radioGroup.getCheckedRadioButtonId());
                btnBreakPoint = (Button) view.findViewById(R.id.btnBreakPoint);

                final Calendar c = Calendar.getInstance();

                final DatePickerDialog.OnDateSetListener date = new DatePickerDialog.OnDateSetListener() {
                    @Override
                    public void onDateSet(DatePicker datePicker, int year, int month, int day) {
                        c.set(Calendar.YEAR, year);
                        c.set(Calendar.MONTH, month);
                        c.set(Calendar.DAY_OF_MONTH, day);

                        String dateFormat = "MM/dd/yyyy";
                        SimpleDateFormat sdf = new SimpleDateFormat(dateFormat, Locale.US);

                        txtSelectDate.setText(sdf.format(c.getTime()));
                    }
                };

                txtSelectDate.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        new DatePickerDialog(ClientActivity.this,
                                date,
                                c.get(Calendar.YEAR),
                                c.get(Calendar.MONTH),
                                c.get(Calendar.DAY_OF_MONTH)).show();
                    }
                });

                btnBreakPoint.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View view) {
                        if(no_container.getText().toString().isEmpty() || txtSelectDate.getText().toString().equalsIgnoreCase("-- CLICK TO DATE DELIVER --")) {
                            Toast.makeText(getApplicationContext(), "All fields require", Toast.LENGTH_SHORT).show();
                        } else {
                            /*Bundle bundle = new Bundle();

                            bundle.putString("station", spnStation.getSelectedItem().toString());
                            bundle.putString("date", txtSelectDate.getText().toString());
                            bundle.putString("no_container", no_container.getText().toString());
                            bundle.putString("type", Integer.toString(radioGroup.getCheckedRadioButtonId()));

                            i = new Intent(ClientActivity.this, CheckOut.class);
                            i.putExtras(bundle);
                            startActivity(i);*/
                            String typeOrder = radioButton.getText().toString();
                            Toast.makeText(getApplicationContext(), typeOrder, Toast.LENGTH_LONG).show();
                        }
                    }
                });

                Network network = new Network(getApplicationContext());

                if(network.isNetwork()) {
                    new ClientActivity.GetStationList().execute();
                } else {
                    Toast.makeText(getApplicationContext(), "Coud not get stations", Toast.LENGTH_SHORT).show();
                }

                builder.setView(view);
                builder.setCancelable(true);

                AlertDialog dialog = builder.create();
                dialog.show();
            }
        });

        btnHistory.setOnClickListener(this);

        btnLogout.setOnClickListener(this);
     }

    @Override
    public void onClick(View view) {
        if(view.getId() == R.id.btnLogout) {
            finish();

            sharedPref = getSharedPreferences("ht", MODE_PRIVATE);
            SharedPreferences.Editor modify = sharedPref.edit();
            modify.putBoolean("login", false);
            modify.putString("id", "");
            modify.putString("auth", "");
            modify.apply();

            i = new Intent(ClientActivity.this, LoginActivity.class);
            startActivity(i);
        }

        if(view.getId() == R.id.btnHistory) {
            i = new Intent(ClientActivity.this, HistoryActivity.class);
            startActivity(i);
        }
    }

    public class GetStationList extends AsyncTask<Void, Void, String> {
        ProgressDialog pd;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            pd = new ProgressDialog(ClientActivity.this);
            pd.setMessage("Getting station ...");
            pd.setCancelable(false);
            pd.show();
        }

        @Override
        protected void onPostExecute(String result) {
            pd.cancel();
            json(result);
        }

        @Override
        protected String doInBackground(Void... voids) {
            String data = "";
            jsonObject = "";

            try {
                String link = (String) Http.url + "?type=getstationlist";
                URL getURL = new URL(link);
                HttpURLConnection httpURLConnection = (HttpURLConnection) getURL.openConnection();

                httpURLConnection.setReadTimeout(10000);
                httpURLConnection.setConnectTimeout(15000);
                httpURLConnection.setRequestMethod("GET");
                httpURLConnection.setDoInput(true);
                httpURLConnection.connect();

                InputStream is = (InputStream) httpURLConnection.getInputStream();

                BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

                while((data = reader.readLine()) != null) {
                    jsonObject += data;
                }

                Log.i("", jsonObject);

                return jsonObject;
            } catch(Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        public void json(String json) {
            List<String> collectionName = new ArrayList<>();
            if(json != null) {
                try {
                    JSONObject jobj = new JSONObject(json);
                    JSONArray jarray = jobj.getJSONArray("stationlist");

                    String name = "";
                    String id = "";

                    for(int i = 0; i < jarray.length(); i++) {
                        JSONObject obj = jarray.getJSONObject(i);
                        name = obj.getString("name");
                        collectionName.add(name);
                    }

                    ArrayAdapter<String> adapter = new ArrayAdapter<>(getBaseContext(), android.R.layout.simple_list_item_1, collectionName);
                    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                    spnStation.setAdapter(adapter);

                } catch(Exception e) {
                    e.printStackTrace();
                }
            } else {
                Toast.makeText(getApplicationContext(), "Connection problem", Toast.LENGTH_SHORT).show();
            }
        }
    }
}

а вот xml где находится макет моего радио

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="20dp">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Select Station"
            android:layout_margin="10dp"
            android:textSize="20sp"/>

        <Spinner
            android:id="@+id/spnStation"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"/>

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Date"
            android:layout_margin="10dp"
            android:textSize="20sp"/>

        <TextView
            android:id="@+id/txtDate"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="-- CLICK TO DATE DELIVER --"
            android:textSize="15sp"
            android:layout_margin="10dp"
            android:layout_gravity="center"
            android:textAlignment="center"/>
        <EditText
            android:id="@+id/etContainer"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="No. Of Containers"
            android:layout_margin="10dp"/>

        <RadioGroup
            android:id="@+id/radioGroup"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <RadioButton
                android:id="@+id/Gallon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Gallon"
                android:checked="true"/>

            <RadioButton
                android:id="@+id/Litre"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Litre" />
        </RadioGroup>

        <Button
            android:id="@+id/btnBreakPoint"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="end"
            android:layout_margin="10dp"
            android:text="Proceed to Check Out" />
    </LinearLayout>
</RelativeLayout>