Certified Kotlin Developer

TABLE OF CONTENT

Kotlin Pre-requisites

• Introduction
• Install the Java JDK 8
• Install Android Studio
• Set Up a Project in Android Studio

Kotlin Basics

• Introduction
• Variables and Data Types
• Null Safety in Kotlin
• Conditionals: "if" Expressions
• Conditionals: "when" Expressions
• Collections
• "for" Loops
• "while" Loops
• Functions
• Get Ready for Serious Kotlin Coding (Set up IntelliJ IDEA)
• Create a main() Function
• Named Arguments & Default Parameter Values
• Exceptions
• Why No Checked Exceptions?

Functional Programming

• Introduction
• What is Functional Programming?
• Functional Programming II
• Lambdas & Higher-Order Functions
• Use map() and flatMap()
• Use take () and drop()
• Use zip ()
• Chain Functions Together
• Lazy Sequences
• 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

• Introduction
• Classes
• Properties with Getters & Setters
• Primary and Secondary Constructors
• Methods
• Extension Functions
• Data Classes
• Enums
• Inheritance
• Code Along: Inheritance Example
• Abstract Classes
• Interfaces
• Overriding Rules
• Smart Casts
• Visibilities
• Companion Objects for "Static" Members
• Object Declarations as Singletons
• Packages and Imports
• Generic Classes
• Generic Functions
• Covariance
• Covariance: Java vs Kotlin
• Covariance vs. Contra variance: "out" and "in"

Kotlin for Android Fundamentals

• Introduction
• Create the App Project
• Understand the Android Versions
• Create a CardView Layout and Add UI Elements
• Use the "Kotlin Android Extensions"

Android RecyclerView

• Introduction
• What is a RecyclerView?
• Create the Data Class "Habit"
• Implement the "HabitsAdapter"

Android Activity

• Introduction
• Add a Menu
• 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 and SQLite

• Introduction
• 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