How to add onCheckedChanged listener to RadioGroup in Android

In this android programming source code example, we are going to add onCheckedChanged listener to RadioGroup in Android.

You can copy and adopt this source code example to your android project without reinventing the wheel.

Below is a step by step source code to add onCheckedChanged listener to RadioGroup in Android.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="10dp"
    android:orientation="vertical"
    tools:context=".radiobutton.RadioButton13">

    <TextView
        android:id="@+id/textView25"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="RadioGroup OnCheckedChangeListener" />

    <RadioGroup
        android:id="@+id/radio"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <RadioButton
            android:id="@+id/radioButton1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RadioButton1" />

        <RadioButton
            android:id="@+id/radioButton2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="RadioButton2" />

    </RadioGroup>

</LinearLayout>

MainActivity.java

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

public class RadioButton14 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_radio_button14);

        RadioGroup radioGroup = findViewById(R.id.radio);
        final RadioButton radioButton = findViewById(R.id.radioButton1);
        final RadioButton radioButton1 = findViewById(R.id.radioButton2);
        radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if (checkedId == R.id.radioButton1){
                    radioButton.setTextColor(getResources().getColor(R.color.colorAccent));
                    radioButton1.setTextColor(getResources().getColor(R.color.colorPrimaryDark));
                }

                if (checkedId == R.id.radioButton2){
                    radioButton.setText("OnCheckedChangeListener");
                }
            }
        });
    }
}