Adding Check Box Functionality In An Android App Using Android Studio

Introduction

In this article, I will show you how to create an Android app using Android Studio that uses Checkbox. Android Checkbox is a type of two state button - either checked or unchecked. There can be a lot of uses for checkboxes. For example, it can be used to learn the hobby of the user or to activate/deactivate the specific action etc.

Requirements

• Android Studio version 2.3.3
• A bit of XML and JAVA knowledge.
• Android Emulator (or) Android mobile
• Download link (Android Studio)

Steps to be followed -

Follow these steps to create the aforementioned app. I have included the source code in the attachment.

Step 1

Open Android Studio and start a new Android Studio Project.

Step 2

You can choose your application name and choose where your project is stored. If you wish to use C++ for coding the project, mark the "Include C++ support", and click "Next" button.

Step 3

Now, select the version of Android and select the target Android devices. We need to choose the SDK level which plays an important role in running the application.

Step 4

Now, add the activity and click "Next" button.

Step 5

Add Activity name and click "Finish".

Step 6

Go to activity_main.xml. This XML file contains the designing code for your Android app.

The XML code is given below.

<RelativeLayout 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=".MainActivity" >
    <TextView

        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=" Pizza Hut"
        android:textSize="44dp"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="13dp" />

    <CheckBox
        android:id="@+id/checkBox1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Pizza"
        android:layout_below="@+id/textView1"
        android:layout_alignStart="@+id/checkBox2"
        android:layout_marginTop="95dp" />

    <CheckBox
        android:id="@+id/checkBox2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Coffe"
        android:layout_marginTop="62dp"
        android:layout_below="@+id/checkBox1"
        android:layout_alignStart="@+id/checkBox3" />

    <CheckBox
        android:id="@+id/checkBox3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Burger"
        android:layout_below="@+id/checkBox2"
        android:layout_alignEnd="@+id/button1"
        android:layout_marginTop="43dp" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Order"
        android:layout_marginBottom="61dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />

</RelativeLayout>

Step 6

Go to Main Activity.java. This Java program is the backend language for Android apps.



The java code is given below.

package abu.checkbox;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.*;

public class MainActivity extends Activity {
    CheckBox pizza,coffe,burger;
    Button buttonOrder;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        addListenerOnButtonClick();
    }
    public void addListenerOnButtonClick(){
       pizza=(CheckBox)findViewById(R.id.checkBox1);
        coffe=(CheckBox)findViewById(R.id.checkBox2);
        burger=(CheckBox)findViewById(R.id.checkBox3);
        buttonOrder=(Button)findViewById(R.id.button1);
        buttonOrder.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View view) {
                int totalamount=0;
                StringBuilder result=new StringBuilder();
                result.append("Selected Items:");
                if(pizza.isChecked()){
                    result.append("\nPizza 100Rs");
                    totalamount+=100;
                }
                if(coffe.isChecked()){
                    result.append("\nCoffe 50Rs");
                    totalamount+=50;
                }
                if(burger.isChecked()){
                    result.append("\nBurger 120Rs");
                    totalamount+=120;
                }
                result.append("\nTotal: "+totalamount+"Rs");

                Toast.makeText(getApplicationContext(), result.toString(), Toast.LENGTH_LONG).show();
            }

        });
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

Step 8

Now, go to menu bar and click "Make Project" or press ctrl+f9 to debug the error.



Step 9

Then, click "Run" button or press shift+f10 To run the project. And choose the virtual machine and click OK.

Conclusion

We have successfully created Checkbox Android application using Android Studio.