CheckBox Android

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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, TextView, and Button classes. Some of these methods are described below:

Method Uses
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();
           }
 
       });
   }
}

Output 1:

Output 2: