This document outlines an Android study jam session which aims to teach participants the basics of building Android apps using Kotlin. The session covers setting up Android Studio, building simple apps, learning Kotlin fundamentals like variables, functions, classes and activities. It also discusses Android app UI components, the activity lifecycle, and resources for continuing to learn Android and Kotlin development.

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Android Study Jams
Kick-off Sessions

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1. Why are you here?
2. What are your goals?
3. How do you plan to achieve them?

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Who would like to share?

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Learning Objectives
० Learn the basics of the Kotlin programming language
० Set up Android Studio on your computer
० Build your first Android apps
० Discover resources to continue learning

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Why Native?
Why not use a cross platform framework?

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Why Kotlin? Why not Java?

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What’s in it for you?

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What you need to
do

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Start here:
g.co/android/studyjams
Collect your first badge!

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Where to start?
There are two tracks
New to programming? Have prior programming experience?
Start here
Start here
This work is licensed under the Apache 2.0 License

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Android Basics
in Kotlin Course

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Unit 1: Kotlin
Basics
For Android

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A Pathway

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Take a Quiz

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Earn badges!

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Developer profile
Carrie Sawyer
Photo by Christopher Campbell on Unsplash

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Concept Overview

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Use Kotlin to start writing Android apps
Kotlin helps developers be more productive
Kotlin Programming Language

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Benefits of Kotlin
● Expressive & Concise
● Safer Code
● Interoperable with Java
● Structured Concurrency

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Write and run Kotlin
code in the browser
Kotlin Playground

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Android Development is Kotlin-First

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fun main() {
println("Hello world!")
}
What does this code do?

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fun main() {
println("Hello world!")
}
What does this code do?
>>> Hello world!

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fun main() {
println("Hello world!")
}
What do you notice about Kotlin?

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fun add(a: Int, b: Int): Int {
return a + b
}
fun display(): Unit {
println("Welcome")
}
Parameters and Return Type

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mutable variable var counter: Int = 5
val name: String = "Rebecca"
immutable variable

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var length = 5
val message = "Welcome"
What’s interesting about these
variable declarations?

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if (score < 20) {
println("Low")
} else if (score < 70) {
println("Medium")
} else {
println("High")
}
when (x) {
0 -> endGame()
1 -> moveNext()
2 -> skipTurn()
}

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side
// This is the Square class
// definition
class Square(val side: Int)
// This is a Square instance
val s = Square(10)
println(s.side)
Classes

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val numList = listOf(1, 2, 3)
val numSet = setOf(4, 5, 6)
val numMap = mapOf("a" to 10, "b" to 20, "b" to 30)
Collections

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Official tool to build Android apps
Android Studio

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Android Emulator
Emulate an Android device on your computer.
Run your app on the emulator

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The part of your app where
the user interacts with it
User Interface

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Aa
Button
Layout
s
Views
Layouts

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Hello Android!
Views
TextView ImageView Button

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MainActivity
An activity provides the
window in which the app
draws its UI.
Activity

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Flowchart
A set of states an activity
can be in during its entire
lifetime
Activity Lifecycle

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Let’s get started

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Additional Resources
Online curriculum
● Android Basics in Kotlin Course
● Android Kotlin Fundamentals Course
● Udacity Developing Android Apps with
Kotlin Course
● Udacity Advanced Android with Kotlin
Android Resources
● Official Android Developers website
● Android Developers YouTube channel
● Android Developers Twitter
● Android Developers Medium blog
● Android Developers Official blog
● Android Developers Newsletter
● Android Codelabs
● Android GitHub page
Kotlin Language Resources
● Official Kotlin Language website
● Kotlin Learn by Example
● Kotlin Vocabulary series

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Share what you’ve
learned with
#AndroidStudyJams

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Stay tuned for Session 2