kotlin programming language for android projects

kotlin basics

1. Kotlin By Sana Mateen

2. Kotlin It is a 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 Instead of println we use Log.d () or update a TextView We Won’t use main() in Android

5. Variables Kotlin has immutable ( 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”

6. DataTypes There are the following different types of primitive data types in Kotlin: Boolean Byte Char Double Float Int Long Short

7. 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:

8. 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:

9. Program

10. Output

11. Program

12. Program

13. Output