Kotlin – Modern Multi platform Android App Development

June 25, 2018

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
}