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Certified Kotlin Developer

Certified Kotlin Developer

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3 Topics

What You’ll Learn in this Course

Make the Most of this Course!

Who’s Using Kotlin?

5 Topics

Install the Java JDK 8

Install Android Studio

Set Up a Project in Android Studio

15 Topics

Variables and Data Types

Null Safety in Kotlin

Conditionals: “if” Expressions

Conditionals: “when” Expressions

“for” Loops

“while” Loops

Get Ready for Serious Kotlin Coding (Set up IntelliJ IDEA)

Create a main() Function

Named Arguments & Default Parameter Values

Why No Checked Exceptions?

Functional Programming

16 Topics

What is Functional Programming?

Functional Programming II

Lambdas & Higher-Order Functions

Use map() and flatMap()

Use take () and drop()

Chain Functions Together

Case Study: Performance of Lazy Sequences

Code Along: Infinite Lazy Sequence of All Prime Numbers

Use “let” Operator for Scoping and Nullables

Use “with” for Many Calls on the Same Object

Use “use” for Closeable (like try-with-resources)

Inline Functions

Object-Orientation in Kotlin

24 Topics

Properties with Getters & Setters

Primary and Secondary Constructors

Extension Functions

Code Along: Inheritance Example

Abstract Classes

Overriding Rules

Companion Objects for “Static” Members

Object Declarations as Singletons

Packages and Imports

Generic Classes

Generic Functions

Covariance: Java vs Kotlin

Covariance vs. Contra variance: “out” and “in”

Kotlin for Android – Fundamentals

6 Topics

Create the App Project

Understand the Android Versions

Create a CardView Layout and Add UI Elements

Use the “Kotlin Android Extensions”

Challenge Solution

Kotlin for Android – Implement a RecyclerView

6 Topics

What is a RecyclerView?

Create the Data Class “Habit”

Implement the “HabitsAdapter” – Part I

Implement the “HabitsAdapter” – Part II

Implement the “HabitsAdapter” – Part III

Kotlin for Android – Let Users Create Habits

9 Topics

Add a Second Activity

Use Intents to Switch Activities

Challenge Solution

Let Users Choose an Image

Get the Selected Image Back (onActivityResult)

Show Error Messages to the User

Code Along: An Extension Function for “EditText”

Kotlin for Android – Use SQLite the Kotlin Way!

13 Topics

Introducing SQLite

Define the Contracts

Implement the Database Helper

Store a Habit to SQLite

Implementing Secure Transactions (that support Rollback)

Clean Code: Improving Transactions in Kotlin

Clean Code: Further Improving Transactions and Performance

Store the Habit in “CreateHabitActivity”

Read All Habits from SQLite

Challenge Solution

Challenge Solution

Add Files to the Virtual Device (Excursus)

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