Building a Tip Calculator Android App: A Step-by-Step Guide with Code Example

Photo by Sam Dan Truong on Unsplash

Introduction

Mobile app development offers an exciting opportunity to create practical and user-friendly tools that can be used in everyday life. In this tutorial, we’ll guide you through the process of building a Tip Calculator app for Android. This example will not only introduce you to the basics of Android app development but also provide a practical use case for your skills.

Prerequisites

Before you begin, make sure you have Android Studio installed on your computer and a basic understanding of Java programming.

Step 1: Create a New Android Project

1. Open Android Studio and select “Start a new Android Studio project.”
2. Choose an “Empty Activity” template.
3. Configure your project details and select “Finish.”

Step 2: Design the User Interface

1. Open the activity_main.xml layout file.
2. Replace the existing code with the following:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"…