Android Development with Kotlin

By : Igor Wojda, Marcin Moskala

2.6 (5)

Buy this Book

Android Development with Kotlin

2.6 (5)

By: Igor Wojda, Marcin Moskala

Buy this Book

Overview of this book

Nowadays, improved application development does not just mean building better performing applications. It has become crucial to find improved ways of writing code. Kotlin is a language that helps developers build amazing Android applications easily and effectively. This book discusses Kotlin features in context of Android development. It demonstrates how common examples that are typical for Android development, can be simplified using Kotlin. It also shows all the benefits, improvements and new possibilities provided by this language. The book is divided in three modules that show the power of Kotlin and teach you how to use it properly. Each module present features in different levels of advancement. The first module covers Kotlin basics. This module will lay a firm foundation for the rest of the chapters so you are able to read and understand most of the Kotlin code. The next module dives deeper into the building blocks of Kotlin, such as functions, classes, and function types. You will learn how Kotlin brings many improvements to the table by improving common Java concepts and decreasing code verbosity. The last module presents features that are not present in Java. You will learn how certain tasks can be achieved in simpler ways thanks to Kotlin. Through the book, you will learn how to use Kotlin for Android development. You will get to know and understand most important Kotlin features, and how they can be used. You will be ready to start your own adventure with Android development with Kotlin.

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

Beginning Your Kotlin Adventure

Say hello to Kotlin

Awesome Kotlin examples

Dealing with Kotlin code

Kotlin under the hood

More reasons to use Kotlin

Summary

Laying a Foundation

Variables

Type inference

Strict null safety

Nullability and Java

Casts

Primitive data types

Composite data types

Statements versus expressions

Control flow

Exceptions

Compile-time constants

Delegates

Summary

Playing with Functions

Basic function declaration and usage

Vararg parameter

Single-expression functions

Tail-recursive functions

Different ways of calling a function

Top-level functions

Top-level functions under the hood

Local functions

Nothing return type

Summary

Classes and Objects

Classes

Properties

Constructors

Inheritance

Interfaces

Data classes

Operator overloading

Object declaration

Object expression

Companion objects

Enum classes

Infix calls for named methods

Visibility modifiers

Sealed classes

Nested classes

Import aliases

Summary

Functions as First-Class Citizens

Function types

Anonymous functions

Lambda expressions

Higher-order functions

Combination of named arguments and lambda expressions

The last lambda in an argument convention

Java SAM support in Kotlin

Named Kotlin function types

Underscore for unused variables

Destructuring in lambda expressions

Inline functions

Function references

Summary

Generics Are Your Friends

Generics

Generic constraints

Variance

Type erasure

Star-projections

Type parameter naming convention

Summary

Extension Functions and Properties

Extension functions

Extension properties

Member extension functions and properties

Generic extension functions

Function literals with a receiver

Summary

Delegates

Class delegation

Property delegation

Summary

Making Your Marvel Gallery Application

Marvel Gallery

Summary

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Classes and Objects

The Kotlin language provides full support for OOP. We will review powerful structures that allow us to simplify data model definition and operate on it in an easy and flexible way. We'll learn how Kotlin simplifies and improves implementations of many concepts known from Java. We will take a look at different types of class, property, initializer block, and constructor. We will learn about operator overloading and interface default implementations.

In this chapter, we will cover the following topics: