Book Image

Kotlin Programming Cookbook

By : Aanand Shekhar Roy, Rashi Karanpuria
Book Image

Kotlin Programming Cookbook

By: Aanand Shekhar Roy, Rashi Karanpuria

Overview of this book

The Android team has announced first-class support for Kotlin 1.1. This acts as an added boost to the language and more and more developers are now looking at Kotlin for their application development. This recipe-based book will be your guide to learning the Kotlin programming language. The recipes in this book build from simple language concepts to more complex applications of the language. After the fundamentals of the language, you will learn how to apply the object-oriented programming features of Kotlin 1.1. Programming with Lambdas will show you how to use the functional power of Kotlin. This book has recipes that will get you started with Android programming with Kotlin 1.1, providing quick solutions to common problems encountered during Android app development. You will also be taken through recipes that will teach you microservice and concurrent programming with Kotlin. Going forward, you will learn to test and secure your applications with Kotlin. Finally, this book supplies recipes that will help you migrate your Java code to Kotlin and will help ensure that it's interoperable with Java.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Introduction


When we develop an app, we should bear in mind those situations when the app won't be connected to the internet. The user might be in an elevator or there might not be any network coverage when they try to use the app. To provide a great user experience, we need to ensure that some parts our app work even when there isn't any network connection. To be able to do this, we need a persistent storage mechanism in our app. It can be achieved by either using shared preferences or using the database. Shared preferences can come in handy when we have small amounts of data such as the app's setting values. Databases are much more powerful for situations when we need to store structured data. In this chapter, we will learn how to use Android's built-in database SQLite and will also learn about dependency injection with Dagger2, which is considered among the best practices for developing a quality app.