Programming languages for developing Android applications

The global Android mobile ecosystem is a gigantic and complex mechanism, the functioning of which depends on many layers of app code. If you have ever thought about creating your own application or were simply interested in how your smartphone works “under the hood,” then the first question that inevitably arises is: in what languages ​​are apps for Android written??

The answer to this question is not as clear-cut as it might seem at first glance. Unlike earlier versions of the operating system, where one language was the uncontested leader, the modern technology stack offers developers flexibility in choice. This is due to the evolution of the platform, the emergence of cross-platform solutions and changes in Google's priorities.

In this article we will examine in detail the main programming languages ​​used for native and cross-platform development, their advantages, disadvantages and areas of application. We'll also touch on performance issues and how language choice affects the speed of your device.

Java: Foundation and Historical Classics

A language for over a decade Java remained the undisputed king in the world of Android development. When Google announced the platform in 2007, Java became the primary tool for creating user interfaces and application logic. Even today, millions of lines of code in existing applications are written in this language, and support for it continues.

Java's main advantage lies in its maturity and huge community of developers. For a beginner, this means the availability of an endless number of tutorials, forums and ready-made solutions for any problem that arises. Dalvik virtual machine (and later ART), on which Android runs, was initially designed taking into account the specifics of Java bytecode, which ensured stability of execution.

However, Java also has significant disadvantages that over time became critical. The language is verbose: performing simple actions often requires writing dozens of lines of code. In addition, Java consumes more memory and runs slower than more modern solutions, which can affect the performance of budget smartphones. Even though Google no longer positions Java as the primary language for new projects, it remains an important skill. Many enterprise systems and legacy projects (outdated but working applications) are built entirely in Java, and their support requires deep knowledge of this language. budget smartphones.

Even though Google no longer positions Java as the primary language for new projects, it remains an important skill. Many enterprise systems and legacy projects (legacy but working applications) are built entirely in Java, and their support requires deep knowledge of this language.

⚠️ Attention: When working with old Java libraries in new Kotlin projects, compatibility problems may arise. Always check the documentation of third-party SDKs before connecting them to your project.

Kotlin: The official standard and modern efficiency

In 2017, Google officially announced Kotlin the preferred language for Android development. This event marked a turning point in the industry. Kotlin was created by JetBrains and is fully compatible with Java, allowing developers to gradually migrate older projects without having to rewrite all the code from scratch.

Why is Kotlin displacing its predecessor? Firstly, it is much more concise. Kotlin code takes on average 30-40% fewer lines than similar Java code, making it easier to read and maintain. Secondly, the language solves one of the most painful programming problems - NullPointerException. Thanks to a type system that eliminates null values by default, the number of critical errors and application crashes is significantly reduced.

Here are the main advantages that make Kotlin a market leader:

• 🚀 High performance: Compilation is faster and the application becomes more responsive.
• 🛡️ Code safety: Built-in protection mechanisms against common runtime errors.
• 🔄 Full interoperability: Ability to use any Java libraries directly in Kotlin code without conversion.

For those who are just starting out your path in development, the choice is obvious. Learning Kotlin will give you relevant skills that are in demand in the job market right now. Modern tools such as Android Studioare optimized specifically for this language, offering smart autocompletion and refactoring.

C and C++: When maximum speed matters

Although Java and Kotlin dominate the creation of user interfaces, the "heart" of the Android operating system beats in the languages C and C++. The Android kernel itself (Linux kernel), device drivers and low-level system libraries are written in them. These are languages ​​that provide direct interaction with the hardware of the smartphone.

Application developers can also use C++ via Android Native Development Kit (NDK). This is necessary in specific cases where computing performance is critical. Typical examples of use: engines for heavy 3D games, real-time video processing algorithms, complex mathematical calculations, or working with sensor signals.

However, the use of C++ in regular application development is not recommended. Working with this language requires manual memory management, which greatly increases the risk of creating security vulnerabilities and system instability. An error in memory management in C++ can lead not just to closing the application, but to a complete reboot of the device.

⚠️ Warning: Using the NDK makes it more difficult to debug the application. Bugs in native code are often harder to detect and fix than in managed Java or Kotlin code.

Unless you're building a high-load game engine or specialized signal processing software, it's best to stick with Kotlin. In most cases, the performance gain from using C++ will be invisible to the user, and development and support costs will increase many times over.

Cross-platform solutions: Dart, JavaScript and others

The world of mobile development is not limited only to native languages. There is a huge layer of technology that allows you to write code once and run it on both Android and iOS. This direction is called cross-platform development, and it is gaining momentum due to saving time and budget.

The leader in this niche is now a framework Flutterusing a programming language Dart. Flutter applications are compiled into native code, which ensures highly smooth animations and performance that is almost as good as native Kotlin applications. Another popular solution is React Nativewhich allows you to write applications in JavaScript, a language familiar to millions of web developers.

Why Dart and not JavaScript for Flutter?

The Dart language was chosen by the creators of Flutter because it supports both fast JIT compilation (for hot reloading during development) and efficient AOT compilation (for creating fast native applications in release). JavaScript does not have such flexibility in this context.

It is also worth mentioning technologies such as Xamarin (C# language) and Ionic (web technologies). They allow you to use the existing knowledge of programmers from other areas. However, cross-platform solutions have their limitations: access to the latest Android features may be delayed, and the application installation file is often larger than its native counterparts.

Comparative table of programming languages

To organize the information and help you make an informed choice, we have prepared a summary table. It reflects the key characteristics of the main languages used in the Android ecosystem.

Language / Technology	Development type	Difficulty of learning	Performance	Main application
Java	Native	Average	High	Legacy projects, corporate sector
Kotlin	Native	Low/Medium	Very high	Modern applications, new standard
C++	Native (NDK)	High	Maximum	Games, graphics and audio processing
Dart (Flutter)	Cross-platform	Low	High	Quick launch on iOS and Android
JavaScript	Cross-platform	Low	Average	Web applications, React Native

As can be seen from the table, for most tasks the optimal choice is a bundle Kotlin + Android SDK. It combines high performance, security and ease of development. C++ should only be used locally, to solve highly specialized problems where every millisecond matters.

Tools and development environment

The choice of a programming language is inextricably linked with the choice of tools. The main development environment (IDE) for Android is Android Studiobased on the IntelliJ IDEA platform. It provides a complete set of tools for working with Java, Kotlin and C++.

To get started, you need to set up your environment. This includes installing the JDK (Java Development Kit), setting up an emulator, or connecting a physical device for debugging. The debugging process on Android has become much easier thanks to features such as Live Edit, which allows you to see changes in the code in real time without restarting the application.

Here is a checklist for basic preparation of the developer workplace:

• 💻 Install the latest version Android Studio from the official website.
• ☕ Set up environment variables for JDK 17 or higher.
• 📱 Enable developer mode and USB debugging on your smartphone.
• 📦 Install the necessary platform SDKs through the package manager in the IDE.

It is important to understand that the ecosystem of tools is constantly updated. What worked a year ago may be outdated today. For example, the Gradon build system is constantly evolving, and plugin versions must match the version of your IDE.

⚠️ Attention: Versions of tools, libraries and minimum Android version requirements (minSdkVersion) change frequently. Before starting a large project, always check the official Google documentation to make sure the technologies used are up-to-date.

The future of Android development: Kotlin Multiplatform and Jetpack Compose

The development of the platform does not stand still. Today, Google is actively promoting a declarative approach to creating interfaces using toolkit Jetpack Compose. This allows you to write UI code in Kotlin much easier and clearer than using old XML markup. Compose is becoming a new standard, and knowledge of it is becoming mandatory for a modern Android developer.

Another trend is Kotlin Multiplatform (KMP). This technology allows you to write the business logic of an application in Kotlin once and use it on Android, iOS, Web and even Desktop. While the interfaces remain native for each platform, the operating logic (network, databases, calculations) becomes common. It's a powerful answer to the challenges of cross-platform development while maintaining all the benefits of native performance.

Which language to choose in 2026 and beyond? The answer remains the same: Kotlin. It evolves, acquires new capabilities and becomes established as a de facto standard. Java will be supported for a long time due to the huge amount of existing code, but all innovations and new features of the platform are primarily focused on Kotlin.

Is it possible to create an Android application in Python?

Technically yes, there are frameworks like Kivy or BeeWare that allow you to use Python. However, these apps are often larger, slower than native apps, and may not adhere to Google's design guidelines. This option is suitable for prototypes or internal tools, but not for high-end commercial products.

Do I need to know Java if I learned Kotlin?

Deep knowledge of Java is not required, but understanding the basics will be a huge plus. Many older libraries and documentation are written in Java. Since Kotlin is fully compatible with Java, you will occasionally encounter Java code in other people's projects or when connecting old SDKs.

Which language is better for creating games on Android?

For complex 3D games, the industry standard is C++ in conjunction with engines like Unreal Engine. For 2D games and medium-complexity projects, Unity (C#) or Godot are great options. Native Kotlin is used primarily for front-end and service applications, rather than for heavy graphics.

Is it difficult to switch from Java to Kotlin?

The transition is quite smooth. Kotlin's syntax is similar in many ways, but more modern. Android Studio has a built-in feature for automatically converting code from Java to Kotlin, which takes care of most of the grunt work. Typically, a developer starts writing in Kotlin after a few days of practice.