Hello Readers! In this post, we are going to learn about how to use android radio group in any android application. We will also go through different attributes of android radio Group that can be used to customise it.

Output

Tutorialwing Android Radio Group Output

Getting Started

Android Radio Group can be defined as below –
Android RadioGroup is a class used to create a multiple-exclusion scope for a set of radio buttons. When several radioButtons are used in a RadioGroup, selecting one radioButton unselects other radioButtons within same group.

Note: – Initially, all radioButtons are unchecked. Checked/Unchecked states of radioButtons are identified by using their unique ids.

Attributes of Android Radio Group Widget

Some of the popular attributes of android Radio group inherited form LinearLayout are –

Some of the popular attributes of android radio group inherited from ViewGroup are –

Some of the popular attributes of android radio group inherited from View are –

Example of Android Radio Group Widget

At first, we will create an android application. Then, we will use this widget in the application.

1. Creating New Project

Follow the steps below to create new project. Please ignore the steps if you have already created a new application.

Now, we will modify xml and java file to use radio group in the application.

2. Modify Values folder

No values folder have been modified. So, we are not going to mention them here.

3. Use Radio group Widget in xml file

Open res/layout/activity_main.xml file. Then, add below code into it.

<?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="match_parent"
	android:gravity="center">

	<RadioGroup
		android:id="@+id/radioGroup"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:paddingLeft="20dp">

		<RadioButton
			android:id="@+id/radioMale"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="10dp"
			android:text="Male"/>

		<RadioButton
			android:id="@+id/radioFemale"
			android:layout_width="wrap_content"
			android:layout_height="wrap_content"
			android:padding="10dp"
			android:text="Female"/>

	</RadioGroup>

</LinearLayout>

In activity_main.xml file, we have used two radioButtons in a radioGroup. Since radioGroup provides mutually exclusive selection. Either radioButton with id radioMale or radioButton with id radioFemale will be selected at a time.

Now, we will access radioGroup in java file to perform some actions on it.

4. Access Radio Group Widget in java file

Open src/main/java/com.tutorialwing.radiogroup/MainActivity.java file. Then, add below code into it.

package com.tutorialwing.radiogroup;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

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

		final RadioGroup radioGroup = findViewById(R.id.radioGroup);
		if (radioGroup != null) {
			radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
				@Override
				public void onCheckedChanged(RadioGroup group, int checkedId) {
					String text = "You selected: ";
					text += (R.id.radioMale == checkedId) ? "male" : "female";
					Toast.makeText(getApplicationContext(), text, Toast.LENGTH_SHORT).show();
				}
			});
		}
	}
}

In MainActivity.java file, we have accessed radioGroup. Then, we have set a listener, checkedChangeListener, to show a toast message, that displays currently selected radioButton, whenever selection changes in the radioGroup.

Since AndroidManifest.xml file is very important in any android application, we are also going to see the content inside this file.

AndroidManifest.xml

Code inside src/main/AndroidManifest.xml file is as below –

<?xml version="1.0" encoding="utf-8"?>
<manifest package="com.tutorialwing.radiogroup"
		  xmlns:android="http://schemas.android.com/apk/res/android">

	<application
		android:allowBackup="true"
		android:icon="@mipmap/ic_launcher"
		android:label="@string/app_name"
		android:roundIcon="@mipmap/ic_launcher_round"
		android:supportsRtl="true"
		android:theme="@style/AppTheme">
		<activity android:name=".MainActivity">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>

				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>

</manifest>

When we run the application, we will get output as shown above.

That’s the end of tutorial on Android Radio Group widget.