What to write an Android application in: choice of technologies

The development of mobile software for one of the most popular operating systems in the world begins with the fundamental question of choosing tools. The ecosystem Android offers developers incredible flexibility, allowing them to choose between native solutions and cross-platform frameworks. This decision directly affects productivity, support cost and speed of product entry to market.

Many beginners mistakenly believe that there is only one right way, but reality dictates different conditions. The choice of technology stack depends on specific business objectives, team size and required application functionality. In this article, we will take a detailed look at the main programming languages ​​and tools that are used by industry professionals today.

Understanding the differences between approaches will help you avoid costly mistakes at the start of a project. We will look at both classic, time-tested methods and modern trends that are changing the face of mobile development.

Native development: the gold standard of the industry

When they talk about creating applications directly for the Android platform, they first of all mean native development. This approach involves the use of official tools from Google and languages ​​that have direct access to all the capabilities of the operating system. Native applications traditionally characterized by maximum performance and stability.

Using a native stack allows developers to access the latest Android features immediately after their release, without waiting for updates to third-party libraries. This is critical for projects that require complex graphics, device sensors, or background processes. However, such power comes at the cost of a higher entry threshold and the need to write separate code for iOS if multi-platform is planned.

⚠️ Attention: Native development requires the maintenance of two separate teams (for Android and iOS) or double the implementation time if the project must cover both platforms.

An integrated environment is used to compile and build projects development Android Studio, which is based on the IntelliJ IDEA platform. It provides powerful debugging tools, memory profilers, and emulators for various devices. This is the environment in which the vast majority of professional apps for the Google Play Store are written.

Kotlin language: Google's modern standard

Google announced the language in 2019 Kotlin priority for development for Android. Running on the Java Virtual Machine (JVM), this language combines concise syntax with the power of object-oriented programming. Kotlin is fully compatible with Java, which allows you to gradually migrate older projects or use existing libraries.

One ​​of the key features of the language is protection against common errors such as NullPointerException. Kotlin's type system forces the developer to explicitly specify whether a variable can contain an empty value, which significantly reduces the number of application crashes in production. In addition, coroutine support makes it easier to work with asynchronous operations, making the code more readable compared to traditional callbacks.

The language syntax allows you to write less boilerplate code, focusing on business logic. Extension functions, data classes, and delegated properties make code compact and expressive. For a modern developer, knowledge of Kotlin has actually become a mandatory requirement for employment in large companies.

Java: heritage and reliability

For many years, the language Java has been the uncontested leader in the world of mobile development. A huge number of existing applications, libraries and documentation are written in it. Despite changes in priorities on the part of Google, Java continues to be a powerful tool, especially in the corporate sector and for supporting legacy projects.

The main advantage of Java is the maturity of the ecosystem. If you encounter a rare bug or a specific problem, the likelihood that the solution has already been found on StackOverflow is close to one hundred percent. The ART (Android Runtime) virtual machine is highly optimized for running Java bytecode, providing decent performance even on older devices.

However, the language also has disadvantages that stimulated the transition to Kotlin. Verbosity in syntax requires writing more lines of code to implement the same logic. The lack of some modern features, such as lambda expressions in older versions (pre-Java 8) or full support for the functional style, can slow down the development process.

⚠️ Attention: When supporting older Java projects, ensure that the version of the JDK used in the build is compatible with the target version of the Android SDK to avoid compilation errors.

However, for beginners, learning Java can be an excellent basis for understanding the principles of OOP, which can then be easily transferred to other languages. Many university courses in mobile development are still built around this language due to its strong typing and explicit structure.

Cross-platform solutions: saving resources

In situations where the budget is limited or it is necessary to launch a product simultaneously on iOS and Android, cross-platform technologies come onto the scene. The Write Once, Run Anywhere approach (write once, run everywhere) allows you to use a single code base for both platforms. This significantly reduces time to market (Time-to-Market).

Modern frameworks have reached such a level of maturity that visually and in terms of performance their applications are often indistinguishable from native ones for the end user. They use their own rendering engines or native components through bridges, providing smooth animation and a responsive interface.

The choice of a specific tool depends on the availability of qualified personnel in the team. If you have web developers who know JavaScript, it's logical to look towards React Native. If the team is strong in C# or Dart, the choice will fall on the appropriate technologies.

The myth about cross-platform performance

Early versions of cross-platform frameworks were indeed inferior to the native ones in speed. However, modern solutions (Flutter, React Native with a new architectural engine) use hardware acceleration and compilation into native code, leveling out the difference in 95% of common tasks.

Flutter and Dart: speed and beauty of interfaces

Framework Flutter, developed by Google, uses the language programming Dart. Its uniqueness lies in the fact that it does not use native operating system interface components, but draws each pixel on the screen independently using the Skia engine (or Impeller on new devices). This guarantees an identical appearance of the application on any platform and OS version.

One ​​of the most favorite features of developers is Hot Reload. It allows you to make changes to the code and instantly see the result on the emulator or device without losing the current state of the application. This speeds up the process of layout and debugging of interfaces significantly, making development interactive and lively.

Dart is a strongly typed language with a syntax reminiscent of Java and C#. It is optimized for creating user interfaces and supports both JIT compilation (for fast development) and AOT compilation (for creating fast release builds). A rich set of ready-made widgets allows you to assemble complex interfaces like from a LEGO constructor.

Characteristics	Native (Kotlin)	Flutter	React Native
Performance	Maximum	High (close to native)	Medium/High
Application size	Minimum	More due to the engine	Medium
Access to API	Direct	Through plugins	Through bridges
Entry threshold	High	Medium	Low (for JS)

React Native and web technologies

The project React Native from Facebook (Meta) allowed web developers to enter the world of mobile development using a familiar language JavaScript and the React library. Unlike Flutter, React Native renders real native iOS and Android components, translating JSX markup into native API calls via an asynchronous bridge.

A huge advantage of this technology is the ability to reuse code between the web version and the mobile application, as well as a giant ecosystem of npm packages. If you need specific functionality, chances are someone has already written a module for it. The React Native community is one of the most active in the world.

However, working across a bridge can create performance bottlenecks when processing large amounts of data or complex real-time animations. To solve this problem, the community is working on a new architecture (Fabric and TurboModules) that will allow JS code to be executed directly on the UI thread, eliminating bridge delays.

⚠️ Attention: When using third-party libraries in React Native, carefully check the date of the last update and compatibility with the current version of the framework, as the ecosystem changes very quickly.

This approach is ideal for applications where the main role is played by content and standard controls: news aggregators, social networks, online stores. For heavy games or applications with intensive video processing, native development or game engines will be preferable.

Specialized engines and low-level code

Not all Applications are written in standard application programming languages. To create high-performance 3D games, developers use game engines such as Unity (C#) or Unreal Engine (C++). These tools provide ready-made physics engines, rendering systems, and audio, abstracting the developer from low-level graphics details.

In cases where computational performance is critical (such as signal processing, encryption, or computer vision), some of the code can be written in C or C++ using Android NDK (Native Development Kit). This code is compiled into native libraries (.so files) and called from the main Java or Kotlin application via JNI (Java Native Interface).

Using an NDK complicates the debugging and building process, so it is resorted to only when the speed benefits outweigh the support costs. For most typical business applications, using pure Kotlin or Java is a more rational choice.

Is it possible to create an Android application in Python?

Technically yes, using frameworks like Kivy or BeeWare, but this path is not recommended for commercial projects. Such applications have large sizes, low performance and limited access to native APIs compared to Kotlin or Flutter.

What is Jetpack Compose?

This is a modern toolkit from Google for creating native interfaces in Kotlin. It uses a declarative approach (similar to Flutter or React), allowing you to describe the UI in code rather than in XML files, which makes it easier to create complex animations and states.

Do you need to know mathematics to develop for Android?

For most applications (catalogs, social networks, utilities), basic logic is enough. Deep knowledge of mathematics is required only when developing games, augmented reality (AR) applications or complex data processing algorithms.

What is the minimum version of Android relevant for development?

Currently, it is recommended to focus on API level 21 (Android 5.0) and higher as the minimum (minSdkVersion) in order to cover more than 95% of active devices, while the target level (targetSdkVersion) must correspond to the latest available OS version.