The CheckBox in Android can be understood as a type of two-state button. Here, the two-state means that it can be either checked or unchecked. Checkboxes can be used to serve various purposes such as selecting the hobbies of a user and to activate/deactivate a specific action. The CompoundButton class in Android has a subclass named CheckBox class.

Android CheckBox class:

To facilitate the creation of the CheckBoxes, Android provides the android.widget.CheckBox class.

Methods of CheckBox class:

The CheckBox class provides various inherited methods of View.

MethodUses
public boolean isChecked()To return true if checked otherwise returns
false.
public void setChecked(boolean status)To change the state of the CheckBox.

Android CheckBox Example:

activity_main.xml:(File: activity_main.xml)

In this example, we will first drag the three checkboxes and one button for the layout in the activity_main.xml file.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
   xmlns:app="http://schemas.android.com/apk/res-auto"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
 >
 
   <CheckBox
       android:id="@+id/checkBox"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_marginLeft="144dp"
       android:layout_marginTop="68dp"
       android:text="Jeans"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toTopOf="parent" />
 
   <CheckBox
       android:id="@+id/checkBox2"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_marginLeft="144dp"
       android:layout_marginTop="28dp"
       android:text="Gown"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toBottomOf="@+id/checkBox" />
 
   <CheckBox
       android:id="@+id/checkBox3"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_marginLeft="144dp"
       android:layout_marginTop="28dp"
       android:text="Shirt"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toBottomOf="@+id/checkBox2" />
 
   <Button
       android:id="@+id/button"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:layout_marginLeft="144dp"
       android:layout_marginTop="184dp"
       android:text="Order"
       app:layout_constraintStart_toStartOf="parent"
       app:layout_constraintTop_toBottomOf="@+id/checkBox3" />
 
</android.support.constraint.ConstraintLayout>

Activity class:(File: MainActivity.java)

In the MainActivity.java file, we are writing the code to check if the toggle button is ON/OFF.

package com.example.app1;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Toast;
 
public class MainActivity extends AppCompatActivity {
   CheckBox a,b,c;
   Button buttonOrder;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
       addListenerOnButtonClick();
   }
   public void addListenerOnButtonClick(){
       //Getting instance of CheckBoxes and Button from the activty_main.xml file
       a=(CheckBox)findViewById(R.id.checkBox);
       b=(CheckBox)findViewById(R.id.checkBox2);
       c=(CheckBox)findViewById(R.id.checkBox3);
       buttonOrder=(Button)findViewById(R.id.button);
 
       //Applying the Listener on the Button click
       buttonOrder.setOnClickListener(new View.OnClickListener(){
 
           @Override
           public void onClick(View view) {
               int totalamount=0;
               StringBuilder result=new StringBuilder();
               result.append("Selected Items:");
               if(a.isChecked()){
                   result.append("\na selected");
                   totalamount+=1000;
               }
               if(b.isChecked()){
                   result.append("\nb selected");
                   totalamount+=5000;
               }
               if(c.isChecked()){
                   result.append("\nc selected");
                   totalamount+=1200;
               }
               result.append("\nTotal: "+totalamount+"Rs");
               //Displaying the message on the toast
               Toast.makeText(getApplicationContext(), result.toString(), Toast.LENGTH_LONG).show();
           }
 
       });
   }
}