Android program to implement Checkbox widget

Checkbox in android is a widget which is a subclass of the Compound button. A checkbox is a specific type of two state button which is either checked or unchecked. For example, if you have ever ordered a pizza on the dominos app or some other app, then in case if you want to add more toppings to your pizza, they use a checkbox to accomplish it.

Methods associated with CheckBox are:-

isChecked() : Returns true if checked or false if unchecked.

In this program, we will be taking a list of food items along with their cost and whichever item is checked we will add the cost and display the total amount in form of a toast message. Only thing you need is the isChecked() method.

If you want to show the amount or bill of the order placed in another activity(screen) then you can check it here, we have used intent for the same.

Steps to create the application:-

Open Android Studio and create a new Android application and name it as “CheckBox” and company domain as codedost so your package will be automatically set.
Open an Empty Activity and name it as MainActivity.
Copy the contents of res/layout/activity_main.xml file.
Run the application to launch Android emulator or you can run it on your mobile also(which is way faster).

XML File(res/layout/activity_main.xml):

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="codedost.checkbox.MainActivity">

    <CheckBox
        android:text="Paneer Makahani (Rs 325)"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="21sp"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="61dp"
        android:id="@+id/checkBox1" />

    <CheckBox
        android:text="Roomali Roti (Rs 80)"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/checkBox1"
        android:layout_marginTop="36dp"
        android:textSize="21sp"
        android:id="@+id/checkBox2" />

    <CheckBox
        android:text="PATNE RICE (Rs 500)"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/checkBox2"
        android:layout_marginTop="42dp"
        android:textSize="21sp"
        android:id="@+id/checkBox3" />

    <Button
        android:text="PLACE ORDER"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/checkBox3"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="78dp"
        android:id="@+id/button" />
</RelativeLayout>

MainActivity.java

package codedost.checkbox;

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 cb1,cb2,cb3;
    Button bOrder;


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

        cb1=(CheckBox) findViewById(R.id.checkBox1);
        cb2=(CheckBox) findViewById(R.id.checkBox2);
        cb3=(CheckBox) findViewById(R.id.checkBox3);
        bOrder=(Button) findViewById(R.id.button);


        bOrder.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                StringBuffer cost= new StringBuffer();
                int amount=0;
                if(cb1.isChecked())
                {
                    cost.append("\nPaneer Makahani (Rs 325)");
                    amount+=325;
                }
                if(cb2.isChecked())
                {
                    cost.append("\nRoomali Roti (Rs 80)");
                    amount+=80;
                }
                if(cb3.isChecked())
                {
                    cost.append("\nPATNE RICE (Rs 500)\n");
                    amount+=500;
                }

                cost.append("\n\nTotal cost = Rs"+amount);
                String r=cost.toString();
                Toast.makeText(getApplicationContext(),"Total Amount = "+amount+"/-",Toast.LENGTH_LONG).show();
            }
        });
    }
}

CODEDOST

Android program to implement Checkbox widget