RadioButton in android

 

Step 1: Create layout such as

<?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">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/rdi_ios"
            android:layout_marginRight="10dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:checked="true"
            android:text="iOs" />

        <RadioButton
            android:id="@+id/rdi_android"
            android:layout_marginLeft="10dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Android" />

    </LinearLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

Step 2: Get control attribute of view on code java file

public class MainActivity extends AppCompatActivity {

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

        RadioButton rdiButton = findViewById(R.id.rdi_ios);
        rdiButton.setChecked(false);
        rdiButton.setOnCheckedChangeListener((buttonView, isChecked) -> {
            Toast.makeText(this, "RadioButton working", Toast.LENGTH_SHORT).show();
        });
    }
}

Step 3: Result