Android Study Jam Prior Prog S-2

This work is licensed under the Apache 2.0 License
Prior Programming Experience Track: Session 2
Android Study Jams
Android Facilitator: Ritika Talukdar

TOPIC TIME
Kotlin Koans revision 6:00-6:45
Pathway 1 and 2 6:45-7:05
Pathway 3 7:05 - 7:30Today’s Schedule

Arrays
val num = arrayOf(1, 2, 3, 4) //implicit type declaration
val num = arrayOf<Int>(1, 2, 3) //explicit type declaration

Strings
● Strings:
var s = “Welcome to Android Study Jams” //implicit type declaration
var s: String = “Welcome to Android Study Jams” //explicit type declaration

Loops
● While loop:
while (condition) {
statement
Iteration
}
Eg. while(i<=10){
println(i)
i++
}
● Do While Loop:
do {
statement
Iteration
} while(condition)
Eg. do{
println(i)
i++
}while(i<=10)

● For Loop:
for (iterations){
operations to perform
}
Eg. for( i in 0..10){
println(i)
}
OUTPUT:
0
1
2
3
4
5
6
7
8
9
10

Lambda expressions are 'function literals', i.e. functions that are not declared, but passed
immediately as an expression. Consider the following example:
max(strings, { a, b -> a.length < b.length })
Function max is a higher-order function, it takes a function value as the second argument.
This second argument is an expression that is itself a function, i.e. a function literal, which is
equivalent to the following named function:
fun compare(a: String, b: String): Boolean = a.length < b.length
Lambda Expressions

It's very common that a lambda expression has only one parameter.
The parameter will be implicitly declared under the name it:
abc.filter { it > 0 } // this literal is of type '(it: Int) -> Boolean'
“It”: Implicit name of a single parameter

Data Classes

Concept Overview

Android Studio

Android Emulator

Aa
Button
Layout
s
Views
Layouts
Pathway 1 Pathway 2 Pathway 3

TextView ImageView Button
Hello Android!
Views

FrameLayout
TextView
TextView
TextView
Button
LinearLayout
TextView
Button
ConstraintLayout
TextView
ViewGroups

Used to align all views in a
single direction- either
horizontally or vertically.
The views will be stacked
one after the other
irrespective of their width.
Linear Layout

Used to arrange views in
positions relative to the
Parent layout.
Used when we want to
arrange the widgets in
relation to one another’s
positions.
Relative Layout

Hello World!
Declare layouts in XML
<TextView
android:text="Hello World!"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

● Activity
● Resources (layout files, images, strings, themes, etc...)
● AndroidManifest.xml
● Gradle files
Anatomy of a Basic App Project

Logistics
Android Kotlin Fundamentals
course

Go to
g.co/android/studyjams
Prior Programming
Experience track

Android Fundamentals
Course
Click Start Course

Android Kotlin
Fundamentals Course

Unit 1

A Pathway

Badges

This work is
licensed under
the Apache 2.0
License
Apps You’ll Build
Dice Roller App About Me App ColorMyViews
App

Share what you’ve
learnt with
#AndroidStudyJams, #dsc #igdtuw and
#DeveloperStudentClubs and tag
@googledevs, @GoogleStudents and
@DSCIGDTUW

Android Study Jam Prior Prog S-2

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