Development of Android applications in Python

The mobile industry has long been associated with native languages like Kotlin or Java, but for millions of developers who speak Pythonit is possible to create full-fledged Androidapplications without a deep dive into platform-specific ones languages. Using Python can significantly reduce the time of writing code and use a huge base of existing libraries, which is especially important for prototyping and creating utilities.

Creating APKfiles in Python requires an understanding of the architecture of cross-platform frameworks that translate your code into instructions that are understandable for the Android system. Although Python is not a native language for the operating system, modern compilation tools can effectively bypass runtime limitations. This opens the door for those who want to automate tasks or release their first project in Google Play.

In this article we will analyze the entire process in detail: from choosing a suitable framework to the final assembly of the installation package. You will learn about the nuances of working with GUI on mobile devices and understand in which cases it is advisable to use Python instead of traditional development methods.

Choosing a tool: Kivy, BeeWare or other frameworks

The first and most critical step is to choose the right framework, as this is what determines how your application will look and work. The most popular solution at the moment remains Kivy - this is an open-source library that allows you to create multi-touch applications with your own interface rendering. It doesn't rely on Android's native widgets, which ensures a consistent look and feel on all devices, but requires coding the interface in the language KV or Python.

An alternative is Project BeeWare (Toga), which strives to use each platform's native controls. This means that your app will look native on Android, iOS, or Windows, but BeeWare's mobile device support is still under active development and may be less stable than Kivy.

There are other options, such like Flet or PyQt, but they have their limitations when assembled for mobile platforms. For example, PyQt requires a commercial license for proprietary projects, while Flet is more focused on web interfaces running inside a WebView. The choice depends on whether you need a native look or a custom design.

• 🐍 Kivy —the most mature library with a huge community and ready-made recipes for building APKs.
• 🐝 BeeWare —the choice for those for whom the native appearance of the interface is critical.
• 🎨 Flet —great for creating interfaces based on Flutter, but managed through Python.
• 📱 PyQt is a powerful tool, but difficult to configure for mobile devices and licensing.

⚠️ Attention: Not all Python libraries are compatible with mobile compilers. If your project depends on heavy computing libraries (for example, NumPy, Pandas), make sure that the selected framework supports their compilation for the ARM architecture.

Preparing the environment and installing dependencies

Before writing the first line of code, you need to set up your development environment correctly. You will need to install yourself Python (version 3.8 or higher is recommended), a package manager pip and, preferably, a virtual environment venv to isolate project dependencies. This will prevent library version conflicts between different projects on your computer.

To work with Kivy, you need to install additional system dependencies. On Windows this is often done through the Kivy installer, on macOS you use Homebrew, and on Linux you use the distribution's package manager (apt, yum). The key component is Cythonwhich is necessary to compile Python code into C code, which significantly speeds up the application on mobile devices.

After installing the basic components, you need to install the framework itself. For Kivy, the command will look like a standard pip package installation, but with dependencies pre-installed. It is important to keep track of versions: new versions of Python may not yet be supported by the latest stable releases of libraries.

pip install --upgrade pip setuptools wheel
pip install kivy
pip install buildozer

Special attention should be paid to installation Buildozer (for Linux/macOS) or python-for-android (for Windows). Buildozer automates the build process by downloading the necessary SDK and NDK tools automatically, which greatly simplifies the life of the developer.

Creating the first interface on Kivy

Interface development in Kivy differs from the usual desktop frameworks. It uses the concept of widgets and Layouts, which control the positioning of elements. You can describe the interface directly in Python code, but to separate the logic and appearance it is better to use markup language KV.

The basic structure of an application always starts with a class Appwhich is the entry point. Inside a method build() you return the root widget, which will be displayed on the screen. If you are using a KV file, Kivy will automatically find a class with the appropriate name and apply the styles described in the file.

For debugging on a real device, you need to enable Developer mode on your smartphone and activate USB debugging. Connect your phone to your computer with a cable. Buildoizer will automatically detect your device, install the app on it, and launch it. Application operation logs will be output to the terminal console in real time.