Kotlin
• It isa modern, statically typed programming
language used for android development.
• It is made by JetBrains.
• It is object oriented and functional language.
• 100% Interoperable with Java(Java code can call
Kotlin and vice versa).
• It is Open Source.
• It is concise, safe and powerful.
3.
History
• February 15,2016: Kotlin 1.0 was released.
• January 04, 2017: Spring introduced Kotlin support
in Spring 5.
• At Google I/O 2017, Google announced first-class
support for Kotlin on Android.
• On 7 May 2019, Google announced that Kotlin the
preferred language for Android app developers.
• June 2022: Kotlin 1.7 was released with the version
of the new K2 compiler
4.
Core Kotlin
• Insteadof println we use Log.d() or update a TextView
• We Won’t use main() in Android
7.
Variables
• Kotlin hasimmutable (val) and mutable (var)
variables.
• val → read-only (like final in Java)
• var → can be reassigned
• Android use
• val button=findViewById<Button>R.id.btnClick
• button.text=“Click Me”
9.
DataTypes
• There arethe following different types of primitive data
types in Kotlin:
• Boolean
• Byte
• Char
• Double
• Float
• Int
• Long
• Short
11.
Boolean
• In Kotlin,Boolean can hold either true or false. To
declare a boolean variable, the var or val keyword
can be used, followed by the variable name, and
the assigned boolean value:
• val isTrue: Boolean = true
• val isFalse: Boolean = false
• A boolean can be used to determine the outcome
of if...else statements:
12.
fun main(){
val condition:Boolean = true
if (condition) {
// Code that gets executed if the
variable is true
} else {
// Code that gets executed if the
variable is false
}
}
Sometimes you specify the type manually:
