Top 10 reasons why Kotlin is the best programming language for Android development

Are you ready to take your Android development skills to the next level? If so, it's time to embrace the power of Kotlin! This modern programming language is quickly becoming the go-to choice for Android app development, and for good reason. In this article, we'll explore the top 10 reasons why Kotlin is the best programming language for Android development.

Reason #1: Interoperability with Java

One of the biggest advantages of Kotlin is its interoperability with Java. Kotlin was designed to be compatible with existing Java code, which makes it easy to integrate into existing projects. You can use Java libraries and frameworks seamlessly in a Kotlin project, and you can even call Java code from within Kotlin code. This makes Kotlin a great choice for developers who are already familiar with Java and want to transition to a more modern language.

Reason #2: Conciseness and readability

Another key advantage of Kotlin is its concise, expressive syntax. Kotlin code is often much shorter and easier to read than equivalent Java code, which can improve productivity and reduce the likelihood of errors. Kotlin also has a number of useful features, such as type inference and higher-order functions, that make code more concise and expressive. For example, Kotlin's "apply" function allows you to configure an object in a compact and expressive way:

val myTextView = TextView(context).apply {
    text = "Hello, world!"
    textSize = 18f

This code creates a new TextView, sets its text size and color, and assigns it to the "myTextView" variable, all in a single expression.

Reason #3: Null safety

One of the most common sources of bugs in Java code is NullPointerExceptions (NPEs). Kotlin addresses this issue with its null safety features. In Kotlin, types can be marked as nullable or non-nullable. Nullable types must be handled explicitly, which prevents many common null-related bugs. For example, in Java it's common to see code like this:

if (myString != null) {
    int length = myString.length();

In Kotlin, you can express the same logic more cleanly and safely:

val length = myString?.length

This code uses the safe call operator "?" to safely access the "length" property of "myString", which will return null if "myString" is null.

Reason #4: Extension functions

Kotlin's extension functions are a powerful feature that allows you to add functionality to existing classes without modifying their source code. This can simplify common coding patterns, such as adding logging or validation to existing classes. For example, you could define an extension function to validate an EditText field:

fun EditText.validateNotEmpty(): Boolean {
    if (text.isNullOrEmpty()) {
        error = "Field cannot be empty"
        return false
    return true

This code defines an extension function "validateNotEmpty" that can be called on any EditText instance. It checks whether the text of the EditText is empty or null, and sets an error message if it is.

Reason #5: Data classes

Kotlin's data classes are a useful feature for modeling data structures. They automatically generate equals(), hashCode(), toString(), and copy() methods based on the properties of the class, which can save a lot of boilerplate code. For example, you could define a simple data class to represent a user:

data class User(val name: String, val age: Int)

This code defines a data class "User" with two properties, "name" of type String and "age" of type Int. The generated methods allow you to compare, hash, and convert instances of the class with ease.

Reason #6: Coroutines

Kotlin's coroutines are a powerful concurrency feature that allows you to write asynchronous code in a more natural and readable way. Coroutines can suspend and resume execution at specified points, which makes it possible to write asynchronous code that looks and behaves like synchronous code. For example, you could use coroutines to load data from a remote API:

suspend fun loadData(): List<Data> = withContext(Dispatchers.IO) {
    val response = api.getData()
    response.body()?.data ?: emptyList()

This code defines a suspending function "loadData" that loads data from a remote API using the "api" object. The withContext() function switches to a background thread, and the suspend keyword indicates that this function can be called asynchronously.

Reason #7: Operator overloading

Kotlin allows you to overload operators, which can make certain types of code more concise and expressive. For example, you could define an operator to combine two lists:

operator fun<T> List<T>.plus(other: List<T>): List<T> = this.toMutableList().apply { addAll(other) }

This code defines an extension function "plus" that combines two lists by creating a new mutable list and adding all the elements from both lists. This allows you to use the + operator to concatenate lists:

val list1 = listOf(1, 2, 3)
val list2 = listOf(4, 5, 6)
val combined = list1 + list2

The "combined" variable will contain the elements [1, 2, 3, 4, 5, 6].

Reason #8: Type inference

Kotlin has powerful type inference features that can save a lot of typing and make code more readable. Kotlin can often infer the types of variables and expressions based on context, which means you don't have to explicitly specify types as often as you would in Java. For example, you could define a variable "number" with an inferred type:

val number = 42

This code defines a variable "number" with the type Int, which is inferred based on the value assigned to it.

Reason #9: Lambdas and higher-order functions

Kotlin's support for lambdas and higher-order functions allows you to write more functional-style code. Higher-order functions are functions that take other functions as parameters or return functions as results. For example, you could define a higher-order function to filter a list:

fun<T> List<T>.filter(predicate: (T) -> Boolean): List<T> {
    val result = mutableListOf<T>()
    for (element in this) {
        if (predicate(element)) {
    return result

This code defines an extension function "filter" that takes a predicate function as a parameter and returns a new list containing only the elements that satisfy the predicate. You could use this function to filter a list of integers:

val numbers = listOf(1, 2, 3, 4, 5)
val evens = numbers.filter { it % 2 == 0 }

The "evens" variable will contain the elements [2, 4].

Reason #10: Google support

Last but not least, Kotlin has significant support from Google, the primary developer of the Android platform. Google officially announced support for Kotlin as a first-class language for Android app development in 2017, and since then Kotlin adoption has been growing rapidly. Google has also released a number of Kotlin-specific tools and libraries, such as Android KTX and Jetpack Compose, which help developers build better Android apps more efficiently.


Kotlin is a modern, expressive programming language that offers many advantages over Java for Android app development. Its interoperability with Java, conciseness and readability, null safety, extension functions, data classes, coroutines, operator overloading, type inference, lambdas and higher-order functions, and Google support make it a compelling choice for developers looking to improve their Android development skills. So what are you waiting for? Start learning Kotlin today and take your Android development to new heights!

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