[Android/Java] radio button

Demo

MainActivity.java

package com.example.recyclerview;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

import static com.example.recyclerview.Data.IMAGE_DRAWABLES;
import static com.example.recyclerview.Data.PROFILE_TEXT;

public class MainActivity extends AppCompatActivity {

    private RadioGroup radioGroup;
    private Button btnReset, btnSubmit;
    private RadioButton radioButton;

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

        radioGroup = findViewById(R.id.my_radio_group);
        btnReset = findViewById(R.id.btn_reset);
        btnSubmit = findViewById(R.id.btn_submit);
        btnSubmit.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                int checkedId = radioGroup.getCheckedRadioButtonId();
                if(checkedId == -1) {
                    Toast.makeText(getApplicationContext(), "Please select", Toast.LENGTH_SHORT).show();
                }else {
                    findRadioButton(checkedId);
                }
            }
        });
        btnReset.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                radioGroup.clearCheck();
            }
        });
        //체크값이 바뀔때 이벤트
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                radioButton = findViewById(checkedId);
                Toast.makeText(getApplicationContext(), radioButton.getText().toString(), Toast.LENGTH_SHORT).show();
            }
        });
    }
    private void findRadioButton(int checkedId) {
        radioButton = findViewById(checkedId);
        switch (checkedId) {
            case R.id.radio_button_01:
                Toast.makeText(getApplicationContext(), radioButton.getText().toString(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.radio_button_02:
                Toast.makeText(getApplicationContext(), radioButton.getText().toString(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.radio_button_03:
                Toast.makeText(getApplicationContext(), radioButton.getText().toString(), Toast.LENGTH_SHORT).show();
                break;
            case R.id.radio_button_04:
                Toast.makeText(getApplicationContext(), radioButton.getText().toString(), Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:layout_gravity="center" >

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Chosse"
        android:textSize="32dp"
        android:layout_gravity="center"/>

    <RadioGroup
        android:id="@+id/my_radio_group"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center">

        <RadioButton
            android:id="@+id/radio_button_01"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="C++"
            android:checked="true"/>

        <RadioButton
            android:id="@+id/radio_button_02"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Java" />

        <RadioButton
            android:id="@+id/radio_button_03"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="php" />

        <RadioButton
            android:id="@+id/radio_button_04"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Python" />

    </RadioGroup>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn_reset"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="reset"
            android:layout_margin="10dp"/>

        <Button
            android:id="@+id/btn_submit"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="submit"
            android:layout_margin="10dp"/>

    </LinearLayout>
</LinearLayout>