Android RadioGroup and RadioButton Tutorial with Examples

RadioButton & RadioGroup
RadioGroup & RadioButtons example
Appendix: Interface design

1. RadioButton & RadioGroup

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RadioButton is a view in Android which is usually used with RadioGroup. In which, RadioGroup is container which contains RadioButton(s), when you check and chose a radio button in group, all other radio button in group will be deselected.

Here are image that RadioButton(s) grouped in different groups..

RadioGroup can arrange RadioButton horizontally or vertically.

2. RadioGroup & RadioButtons example

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Example preview:

Create a project named AndroidRadioDemo.

File > New > New Project > Empty Activity
- Name: AndroidRadioDemo
- Package name: org.o7planning.androidradiodemo
- Language: Java

The application interface:

If you are interested in the steps to design the interface of this application, please see the appendix at the end of the article.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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">

    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="19dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Game Settings"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_height="30dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="19dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Game character"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView" />

    <RadioGroup
        android:id="@+id/radioGroup_character"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="12dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView2">

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

        <RadioButton
            android:id="@+id/radioButton_female"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Famale" />
    </RadioGroup>

    <TextView
        android:id="@+id/textView3"
        android:layout_width="0dp"
        android:layout_height="29dp"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:text="Difficulty Level"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup_character" />

    <RadioGroup
        android:id="@+id/radioGroup_diffLevel"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="16dp"
        android:layout_marginLeft="16dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="16dp"
        android:layout_marginRight="16dp"
        android:orientation="horizontal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView3">

        <RadioButton
            android:id="@+id/radioButton_easy"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Easy" />

        <RadioButton
            android:id="@+id/radioButton_medium"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Medium" />

        <RadioButton
            android:id="@+id/radioButton_hard"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="0"
            android:text="Hard" />
    </RadioGroup>

    <Button
        android:id="@+id/button_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="Save"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/radioGroup_diffLevel" />
</androidx.constraintlayout.widget.ConstraintLayout>

MainActivity.java

package org.o7planning.androidradiodemo;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private RadioGroup radioGroupCharacter;
    private RadioButton radioButtonMale;
    private RadioButton radioButtonFemale;

    private RadioGroup radioGroupDiffLevel;
    private RadioButton radioButtonEasy;
    private RadioButton radioButtonMedium;
    private RadioButton radioButtonHard;

    private Button buttonSave;

    private String LOGTAG = "AndroidRadioDemo";

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

        //
        this.radioGroupCharacter= (RadioGroup) this.findViewById(R.id.radioGroup_character);
        this.radioButtonMale = (RadioButton) this.findViewById(R.id.radioButton_male);
        this.radioButtonFemale  =  (RadioButton)this.findViewById(R.id.radioButton_female);
        this.radioButtonMale.setChecked(true);

        //
        this.radioGroupDiffLevel= (RadioGroup) this.findViewById(R.id.radioGroup_diffLevel);
        this.radioButtonEasy = (RadioButton) this.findViewById(R.id.radioButton_easy);
        this.radioButtonMedium  =  (RadioButton)this.findViewById(R.id.radioButton_medium);
        this.radioButtonHard =  (RadioButton)this.findViewById(R.id.radioButton_hard);
        this.radioButtonMedium.setChecked(true);

        this.buttonSave= (Button) this.findViewById(R.id.button_save);

        // When radio group "Difficulty Level" checked change.
        this.radioGroupDiffLevel.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                doOnDifficultyLevelChanged(group, checkedId);
            }
        });

        // When radio button "Female" checked change.
        this.radioButtonMale.setOnCheckedChangeListener(new RadioButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                doOnGameCharacterChanged(buttonView,isChecked);
            }
        });

        // When radio button "Male" checked change.
        this.radioButtonFemale.setOnCheckedChangeListener(new RadioButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                doOnGameCharacterChanged(buttonView,isChecked);
            }
        });

        // When button "Save" clicked.
        this.buttonSave.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                doSave();
            }
        });
    }


    // When radio group "Difficulty Level" checked change.
    private void doOnDifficultyLevelChanged(RadioGroup group, int checkedId) {
        int checkedRadioId = group.getCheckedRadioButtonId();

        if(checkedRadioId== R.id.radioButton_easy) {
            Toast.makeText(this,"You choose the level of difficulty: Easy",Toast.LENGTH_SHORT).show();
        } else if(checkedRadioId== R.id.radioButton_medium ) {
            Toast.makeText(this,"You choose the level of difficulty: Medium",Toast.LENGTH_SHORT).show();
        } else if(checkedRadioId== R.id.radioButton_hard) {
            Toast.makeText(this,"You choose the level of difficulty: Hard",Toast.LENGTH_SHORT).show();
        }
    }

    // When radio button checked change.
    private void doOnGameCharacterChanged(CompoundButton buttonView, boolean isChecked)  {
        RadioButton radio =(RadioButton) buttonView;

        Log.i(LOGTAG, "RadioButton "+ radio.getText()+" : "+ isChecked);
    }

    // When button "Save" clicked.
    private void doSave()  {
        int difficultyLevel = this.radioGroupDiffLevel.getCheckedRadioButtonId();
        int gameCharacter = this.radioGroupCharacter.getCheckedRadioButtonId();

        RadioButton radioButtonDiffLevel = (RadioButton) this.findViewById(difficultyLevel);
        RadioButton radioButtonGameCharacter = (RadioButton) this.findViewById(gameCharacter);

        String message ="Difficulty Level: "+ radioButtonDiffLevel.getText()
                +", Game Character: " + radioButtonGameCharacter.getText() ;

        Toast.makeText(this,message,Toast.LENGTH_LONG).show();
    }
}