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 the "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 the "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 7

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;
}
}