Compose Camp Session 2

This work is licensed under the Apache 2.0 License
Compose Camp
Session 2
8 October 2022
Introduction to Kotlin
& Jetpack compose

Akshat Bajpai
Facilitator
Compose Facilitator

Basic data types
Kotlin Data type What kind of data it can contain Example literal values
String Text
“Add contact”
“Search”
Int Whole integer number
32
-59873
Double Decimal number
2.0
-37123.9999
Float
Decimal number (less precise than a Double).
Has an f or F at the end of the number.
5.0f
-1630.209f
Boolean
true or false. Use this data type when there
are only two possible values.
true
false

val keyword
Use when you expect the variable value will
not change.
Example: name
var keyword
Use when you expect the variable value can
change.
Example: age
Defining a variable

Defining a variable
Variables start with a var or val
keyword.
fun displayIntroduction() {
val name: String = "Meghan"
var age: Int = 28
}

Defining a variable
All variables must have a name.
var age: Int = 28
}

Defining a variable
Data type is the type of data
that the variable holds.
var age: Int = 28
}

Defining a variable
The initial value is the value that
is stored in the variable.
var age: Int = 28
}

Putting it together
val name = "Meghan"
val age = 28
println("Hi I'm $name and I am $age years old")
}

Putting it together
fun main() {
displayIntroduction()
}
val name = "Meghan"
val age = 28
println("Hi I'm $name and I am $age years old")
}
Output:
Hi I’m Meghan and I am 28 years old

IF ELSE
var a:String=”Hello”
if(a==”World”){
println("$a Shane")
}
else{
printLn(“Hey World”)
}
Output:
Hey World

For Each
val a= "Cabbage"
a.forEach{
print(it)
}
Output:
Cabbage

While
var a= 10
while(a>0){
print("$a ")
a-=1
}
Output:
10 9 8 7 6 5 4 3 2 1

While
var a= 10
do{
print("$a ")
a-=1
}while(a>10)
Output:
10

listOf()
val a= listOf(1,2,3,4,5)
a.forEach{
print("$it ")
}
Output:
1 2 3 4 5

arrayOf()
Var a=arrayOf(“A”,”B”,”C”,”D”)
a.forEach{
print(it)
}
Output:
ABCD

mapOf()
var a=mapOf(1 to “A”, 2 to “B”, 3 to “C”, 4 to “D”)
a.forEach{
print(it.value)
}
Output:
ABCD

Greeting()
@Composable
fun Greeting(name: String) {
Text(text = "Howdy $name!")
}

What’s coming next:

Layout Lake
This work is
licensed under the
Apache 2.0 License

Material Tents
This work is
licensed under the
Apache 2.0 License

Stargazing at State

Performance Peak
This work is licensed under
the Apache 2.0 License

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Resources

g.co/android/basics-compose
Start here:

Android Basics
with Compose Course

Unit 1: Your first
Android App

A Pathway

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Session!
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THANK YOU
for participating Compose Camp Day 2
Do participate in the Upcoming session

Compose Camp Session 2

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Editor's Notes