Kotlin – Modern Multi platform Android App Development

When you invent about Android App development, odds are one programming language instantly springs to mind: Java.

While it’s valid that the greater part of Android applications is composed in Java, with regards to Android app development, Java isn’t your solitary choice.

You can compose Android applications in any language that can assemble and keep running on the Java Virtual Machine (JVM), and your end clients will be unaware. What’s more, one JVM-good programming language that is truly taken the eye of the Android association is Kotlin, a statically written programming language from JetBrains.

If you’ve heard great things about Kotlin and are occupied with attempting it for yourself, at that point you’re in the correct place. In this three-section arrangement, I will share all that you have to know so as to begin utilizing Kotlin for Android development.

Kotlin is now an official language on Android. It’s expressive, compact, and powerful. Best of all, it’s interoperable with our current Android languages and runtime. Google has officially announced Kotlin as a first class language for Android.

Modern. Expressive. Safe.

It contains security features for nullability and immutability, to make your Android apps strong and performant by default.

Kotlin is the first of its kind statically wrote programming language that can be utilized for building current multi-stage applications.

Java has been the essential language for Android app development until the point when Kotlin appeared. After the coming of Kotlin, it is out of line to state ‘Java is the main or rather the best decision for development’.

For what reason Should ‘Kotlin’ be Android app Developer’s Choice?

Designers who have officially changed from Java to Kotlin to program applications would know how it is superior to Java. Kotlin app development has risen as a developing selection of organizations needing to construct one of a kind applications. Created by JetBrains, this programming language is even-minded and compact, which makes coding a fantastic affair for designers.

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Given underneath are an arrangement of highlights that clarify why designers ought to settle on Kotlin:

• Java Interoperability
• Familiar Syntax
• Less Coding
• Ease of Learning
• Concise Coding
• Safety
• Free to Use
• Tool-friendly

What Java has that Kotlin does not

• Checked exceptions
• Primitive types that are not classes
• Static members
• Non-private fields
• Wildcard-types

What Kotlin has that Java does not

• Lambda expressions + Inline functions = performant custom control structures
• Extension functions
• Null-safety
• Smart casts
• String templates
• Properties
• Primary constructors
• First-class delegation
• Type inference for variable and property types
• Singletons
• Declaration-site variance & Type projections
• Range expressions
• Operator overloading
• Companion objects
• Data classes
• Separate interfaces for read-only and mutable collections

From Java To Kotlin – Your Cheat Sheet For Java To Kotlin

Print to Console

Java
System.out.print("Amit Shekhar");
System.out.println("Amit Shekhar");

Kotlin
print("Amit Shekhar")
println("Amit Shekhar")

Constants and Variables

Java
String name = "Amit Shekhar";
final String name = "Amit Shekhar";

Kotlin
var name = "Amit Shekhar"
val name = "Amit Shekhar"

Assigning the null value

Java
String otherName;
otherName = null;

Kotlin
var otherName: String?
otherName = null

Concatenation of strings

Java
String firstName = "Amit";
String lastName = "Shekhar";
String message = "My name is: " + firstName + " " + lastName;

Kotlin
val firstName = "Amit"
val lastName = "Shekhar"
val message = "My name is: $firstName $lastName"

New line in a string

Java
String text = "First Line\n" +
                     "Second Line\n" +
                     "Third Line";

Kotlin
val text = """
                |First Line
                |Second Line
                |Third Line
                """.trimMargin()

Ternary Operations

Java
String text = x > 5 ? "x > 5" : "x <= 5";

String message = null;
log(message != null ? message : "");

Kotlin
val text = if (x > 5)
                       "x > 5"
                   else "x <= 5"

val message: String? = null
log(message ?: "")

Logical Operators

Java
final int andResult = a & b;
final int orResult = a | b;
final int xorResult = a ^ b;
final int rightShift = a >> 2;
final int leftShift = a << 2;
final int unsignedRightShift = a >>> 2;

Kotlin
val andResult = a and b
val orResult = a or b
val xorResult = a xor b
val rightShift = a shr 2
val leftShift = a shl 2
val unsignedRightShift = a ushr 2

Check the type and casting

Java
if (object instanceof Car) {
}
Car car = (Car) object;

Kotlin
if (object is Car) {
 }
var car = object as Car
 // if object is null var car = object as? Car // var car = object as Car?

Multiple conditions

Java
if (score >= 0 && score <= 300) { }

Kotlin
if (score in 0..300) { }

Splitting arrays

java
String[] splits = "param=car".split("=");
String param = splits[0];
String value = splits[1];

kotlin
val (param, value) = "param=car".split("=")

Defining methods

Java
void doSomething() {

 // logic here

 }

Kotlin
fun doSomething() {

// logic here

 }