Practical Java Programming for IoT, AI, and Blockchain

CHAPTER 6Java Programming for Mobile Applications

“It is what you learn after you know it all that counts.”

—John Wooden

• 6.1 Introduction
• 6.2 Android Studio
• 6.3 The Hello World App
• 6.4 The Button and TextView Apps
• 6.5 The Sensor App
• 6.6 Deploying Android Apps
• 6.7 The Activity Life Cycle of an Android App
• 6.8 MIT App Inventor
• 6.9 5G
• 6.10 Summary
• 6.11 Chapter Review Questions

6.1 Introduction

Ever since 2007, when Apple first introduced its iPhone, our passion for smartphones has become stronger and deeper. Smartphone sales have rocketed. There are around 2.5 billion smartphones worldwide in 2019, according to Statista (https://www.statista.com/). Smartphones are an excellent example of a modern technology that has fundamentally revolutionized our lives. With smartphones, you can search the Internet, book flights and hotels, and order food and taxies all with just a few finger swipes. With mobile payment, in many places, you can survive with just a phone, without needing cash or credit card in your wallet! Smartphones have truly gone from luxury items to daily necessities in the span of about 10 years' time.

There are generally two main types of smartphones on the market, Google's Android phones and Apple's iPhones. There are an estimated five billion mobile users in the world. The largest market share is held by phones using Google's Android operating system, which occupies more than 80 percent of the market. The top Android phone makers are Samsung, Huawei, Google, ...