Android RadioButton Example

A RadioButton is a widget that belongs to the RadioGroup class and is designed to provide a set of mutually exclusive choices to the user. The user can only select her one option from a group of RadioButton elements.

Here is the tutorial for Kotlin

Here is a simple example of using RadioButton in an Android app.

There Are Some Common Attributes for RadioButton

Step 1:

File open res/layout/activity_main.xml file −

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



    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:layout_margin="10dp"
        android:orientation="vertical">

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

            <RadioButton
                android:id="@+id/radio_mango"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Mango" />

            <RadioButton
                android:id="@+id/radio_banana"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Banana" />

            <Button
                android:id="@+id/buttonSubmit"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Submit" />

            <TextView
                android:id="@+id/textResult"
                android:gravity="center"
                android:layout_marginTop="10dp"
                android:textSize="18dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:text="Result" />


        </RadioGroup>
    </LinearLayout>




</RelativeLayout>

Step 2:

File open com.microappvalley.newtestproject/MainActivity.java file −

Java

package com.microappvalley.newtestproject;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ImageButton;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {
 Button buttonSubmit;
 RadioButton radio_mango;
 RadioButton radio_banana;
 RadioButton radio_orange;
 TextView textResult;
 ImageButton imageButton;
 String radioButtonData="";
    @SuppressLint("MissingInflatedId")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        buttonSubmit=(Button) findViewById(R.id.buttonSubmit);
        radio_mango=(RadioButton) findViewById(R.id.radio_mango);
        radio_banana=(RadioButton) findViewById(R.id.radio_banana);
        textResult=(TextView) findViewById(R.id.textResult);


        radio_mango.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
                if (isChecked){
                    radioButtonData="Mango";
                    Toast.makeText(MainActivity.this, "Mango Button "+isChecked, Toast.LENGTH_SHORT).show();
                }
            }
        });

        radio_banana.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
                if (isChecked){
                    radioButtonData="Banana";
                    Toast.makeText(MainActivity.this, "Banana Button "+isChecked, Toast.LENGTH_SHORT).show();
                }

            }
        });


        buttonSubmit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {


                textResult.setText(radioButtonData);
                Toast.makeText(MainActivity.this, radioButtonData, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

Open Device Manager, run the emulator, and  then run the application. Next, check the working output and check the output  you declared in your code.