How to get selected Index of the Radio group in Android?

This example demonstrates how do I get selected index of the radio group in android.

Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

<RelativeLayout
   xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:tools="http://schemas.android.com/tools"
   android:id="@+id/rl"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:padding="10dp"
   tools:context=".MainActivity">
   <TextView
      android:id="@+id/tvResult"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:paddingBottom="15dp" />
   <TextView
      android:id="@+id/textView"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Which is your most favorite?"
      android:textStyle="bold"
      android:textSize="16sp"
      android:layout_below="@+id/tvResult" />
   <RadioGroup
      android:id="@+id/radioGroup"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:orientation="vertical"
      android:layout_below="@id/textView"
      android:padding="15dp">
   <RadioButton
      android:id="@+id/rbNetflix"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:text="Netflix"
      android:paddingRight="15dp" />
   <RadioButton
      android:id="@+id/rbAmazonPrime"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:text="Amazon Prime"
      android:paddingRight="15dp" />
   </RadioGroup>
   <Button
      android:id="@+id/btnGetItem"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Get Selected Radio Button"
      android:layout_below="@+id/radioGroup" />
</RelativeLayout>

Step 3 − Add the following code to src/MainActivity.java

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
   TextView textView;
   Button button;
   RadioGroup radioGroup;
   RadioButton selectedRadioButton;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      textView = findViewById(R.id.textView);
      button = findViewById(R.id.btnGetItem);
      radioGroup = findViewById(R.id.radioGroup);
      button.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            int selectedRadioButtonId = radioGroup.getCheckedRadioButtonId();
            if (selectedRadioButtonId != -1) {
               selectedRadioButton = findViewById(selectedRadioButtonId);
               String selectedRbText = selectedRadioButton.getText().toString();
               textView.setText(selectedRbText + " is Selected");
            } else {
               textView.setText("Nothing selected from the radio group");
            }
         }
      });
   }
}

Step 4 - Add the following code to androidManifest.xml

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

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click Run  icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen –

Click here to download the project code.

Azhar

Updated on: 02-Jul-2020

3K+ Views

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