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Android RadioButton

RadioButton:

RadioButton is a User interface detail that permits the user to select one alternative from a set of at the same time distinct alternatives.

It is regularly utilized in groups in which only one alternative can be selected at a time. When one RadioButton in a set is selected, any previously decided on RadioButton inside the equal institution is automatically deselected.

Example:

                                    
                                        <?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"
        tools:context=".RadioButtonExample"
        android:orientation="vertical"
        android:gravity="center">
   
        <TextView
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_centerHorizontal="true"
           android:text="Choice to eat"
           android:textSize="26sp"
           android:textColor="@color/colorAccent"
           />
   
          <RadioGroup
           android:id="@+id/rgroup"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_marginTop="50dp">
   
          <RadioButton
               android:id="@+id/rbutton1"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="Pizza"
               android:textSize="16sp"
               android:textColor="@color/colorPrimary"/>
          <RadioButton
               android:id="@+id/rbutton2"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="Berger"
               android:textSize="16sp"
               android:textColor="@color/colorPrimary"/>
   
          </RadioGroup>
   
    </LinearLayout>

                                    
                                          package com.example.widgets;
                                          
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
                                          
public class RadioButtonExample extends AppCompatActivity {
                                         
      RadioGroup radioGroup;
      RadioButton radioButton1,radioButton2;
                                         
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_radio_button_example);
                                         
          radioGroup=(RadioGroup)findViewById(R.id.rgroup);
          radioButton1=(RadioButton) findViewById(R.id.rbutton1);
          radioButton2=(RadioButton) findViewById(R.id.rbutton2);
                                         
          radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch(checkedId){
                    case R.id.rbutton1:
                                         
                        Toast.makeText(getApplicationContext(),"Pizza",Toast.LENGTH_SHORT).show();
                        break;
                                         
                    case R.id.rbutton2:
                                         
                        Toast.makeText(getApplicationContext(),"Berger",Toast.LENGTH_SHORT).show();
                        break;
                }
            }
          });
                                         
      }
}

                                    
                                      package com.example.widgets

                                      import android.os.Bundle
                                      import android.widget.RadioButton
                                      import android.widget.RadioGroup
                                      import android.widget.Toast
                                      import androidx.appcompat.app.AppCompatActivity
                                      
                                      class RadioButtonExample : AppCompatActivity() {
                                      
                                          private lateinit var radioGroup: RadioGroup
                                          private lateinit var radioButton1: RadioButton
                                          private lateinit var radioButton2: RadioButton
                                      
                                          override fun onCreate(savedInstanceState: Bundle?) {
                                              super.onCreate(savedInstanceState)
                                              setContentView(R.layout.activity_radio_button_example)
                                      
                                              radioGroup = findViewById(R.id.rgroup)
                                              radioButton1 = findViewById(R.id.rbutton1)
                                              radioButton2 = findViewById(R.id.rbutton2)
                                      
                                              radioGroup.setOnCheckedChangeListener { group, checkedId ->
                                                  when (checkedId) {
                                                      R.id.rbutton1 -> {
                                                          Toast.makeText(applicationContext, "Pizza", Toast.LENGTH_SHORT).show()
                                                      }
                                                      R.id.rbutton2 -> {
                                                          Toast.makeText(applicationContext, "Burger", Toast.LENGTH_SHORT).show()
                                                      }
                                                  }
                                              }
                                          }
                                      }

Output