Mobile software development ceased to be the domain of specialized specialists a few years ago. Today, the question how to make a mobile application for Androidis of interest not only to programmers, but also to entrepreneurs, startuppers and enthusiasts who want to automate their business processes. The Google ecosystem provides a huge range of tools that allow you to implement an idea of any complexity: from a simple calculator to a multifunctional marketplace with the integration of artificial intelligence.
However, before diving into writing code, you need to clearly understand the architecture of the process. Creation Android applications is not just a set of lines in the editor, but a complex cycle that includes interface design, writing logic, testing on various devices and subsequent distribution. The success of the project directly depends on the correctly chosen technology stack and understanding of the operating principles of the operating system.
In this article we will analyze the full path from idea to publication in Google Play, paying attention to both classical development methods and modern cross-platform solutions.
Choice of approach and development tools
The first and most critical stage is choosing a technology stack. The speed of development, the performance of the final product and the ability to scale it in the future depend on this decision. At the moment, there are three main directions, each of which has its own advantages and limitations.
Native development is considered the “gold standard” of quality. It implies the use of official Google languages: Kotlin or Java. This allows you to get maximum performance and full access to all device features, including camera, GPS and biometric sensors. The official environment is used for work Android Studio, which contains all the necessary emulators and profilers.
Cross-platform development is gaining immense popularity due to the ability to write code once and run it on both Android and iOS. Frameworks like Flutter (Dart language) or React Native (JavaScript) significantly save budget and time. However, versatility sometimes comes at the price of slightly lower performance in graphically intensive tasks or difficulties accessing specific hardware functions.
⚠️ Attention: The choice of tool should be based on the requirements of the project. If you need complex 3D graphics or working with Bluetooth in the background, native development will be preferable to cross-platform solutions.
There are also application builders (No-Code/Low-Code platforms) that allow you to assemble an interface from ready-made blocks. This is suitable for simple MVPs (minimum viable products), but seriously limits the flexibility and customization of the interface.
Setting up the Android Studio development environment
To start working with native code or even to debug cross-platform projects, you will need a powerful workstation. The main tool is Android Studio, based on the IntelliJ IDEA platform. The installation process requires care, since incorrect configuration can lead to problems with compiling projects in the future.
After downloading the installer from the official website of the developer, you must run the installation wizard. It is critically important not to skip the installation stage Android SDK (Software Development Kit) and emulator. It is the SDK that contains the libraries necessary to compile code for different versions of the operating system. Without them, the development environment will be useless.
During the setup process, you will be asked to select components to install. It is recommended to check the latest stable versions of the platform and system images for the emulator. This will allow you to test the application on virtual devices with different screen resolutions and versions Android without the need to have a dozen physical smartphones at hand.
Allocate at least 20-30 GB of free space on a fast SSD disk for installing Android Studio and SDK. Working with virtual machines and building projects requires high speed reading and writing data.
After installation is complete, open the project and check for updates through the menu Help → Check for Updates. Regularly updating the development environment ensures that you receive the latest security patches and support for new programming language features.
Architecture and interface design
Before writing the first line of code, you need to design the structure of the application. Chaotic development without a plan often leads to the fact that the project becomes unsupportable already at the stage of adding the second feature. The modern approach to architecture in the Android ecosystem is based on the principles of separation of concerns.
The most popular and recommended architecture by Google is MVVM (Model-View-ViewModel). It clearly separates the data display logic (View) from the business logic (ViewModel) and the data itself (Model). This separation simplifies testing of individual modules and allows you to change the interface without affecting the internal logic of the app.
The XML markup system has traditionally been used to create the user interface. However, in recent years, the modern Declarative UI toolkit from Google has become the de facto standard. It allows you to describe the interface directly in the Kotlin language, which makes the code more concise, understandable and less prone to syntax errors. Jetpack Compose - modern Declarative UI toolkit from Google. It allows you to describe the interface directly in Kotlin, which makes the code more concise, understandable and less prone to syntax errors.
| Architecture component | Purpose | Use example |
|---|---|---|
| Activity | Entry point, manages the life cycle screen | Main screen of the application |
| Fragment | Modular part of the interface inside the Activity | List of products in the store |
| ViewModel | Storing UI data, surviving configuration changes | List of users in memory |
| Repository | Single data source (network + database) | Getting exchange rates |
It is also important to think about navigation between screens. For this, a component is used Navigation Component, which allows you to visually design a transition graph and safely transfer data between screens through arguments.
What is the Activity life cycle?
The Activity life cycle describes the states in which the application screen can be: onCreate, onStart, onResume, onPause, onStop, onDestroy. Understanding these states is critical for correctly saving data when rotating the screen or minimizing the application.
Writing code and implementing logic
Direct implementation of functionality begins with setting up the project and connecting the necessary dependencies. The file build.gradle (module level) specifies the libraries that will be used in the project. These could be tools for working with the network (for example, Retrofit), loading images (Glide or Coil) or local database (Room).
When working with network requests, never perform heavy operations in the main thread (UI Thread). This will freeze the interface and cause an error. ANR (Application Not Responding). For asynchronous tasks in Kotlin, Coroutines or Flows are ideal. They allow you to write asynchronous code as if it were executed sequentially, which significantly increases readability.
// An example of a simple request using coroutineslifecycleScope.launch {
try {
val response = apiService.getData()
updateUI(response)
} catch (e: Exception) {
showError(e.message)
}
}
Working with user data requires special attention To store small ones. settings, use SharedPreferences or DataStore. For complex structured data, such as a news cache or order history, a full-fledged database is required. Room provides a convenient wrapper over SQLite, allowing you to work with the database through Java/Kotlin objects.
⚠️ Attention: Never store sensitive data (passwords, access tokens, API keys) in clear form inside code or in SharedPreferences. Use secure storage EncryptedSharedPreferences or system Keystore.
☑️ Ready to write code
Testing and debugging of the application
Testing is not an option, but a mandatory part of the development process. A mistake missed during the development stage can cost your reputation and negative reviews in the app store. The testing process is divided into several levels: unit testing, integration testing and UI testing.
For real-time debugging, use the built-in tool Logcat in Android. Studio. It displays system logs and messages that you output in code through the Log.d() or Log.e(). Filtering logs by tag or severity level helps you quickly find the cause of an application crash.
The emulator allows you to test the operation of the application on different versions of Android and screen resolutions. However, an emulator cannot always reproduce the behavior of real hardware, especially when it comes to motion sensors, GPS or a camera. Therefore, testing on physical devices (Real Devices) is a mandatory step before release.
Automated tests help ensure that new changes do not break existing functionality. The framework Espresso allows you to record user behavior scenarios (button presses, text input) and check the interface's response. Running such tests can be integrated into the continuous integration (CI/CD) process.
Preparation for publication and optimization
When the application is ready, the preparation for publication stage begins. Google Play requires signing the application with a digital key. This key (Keystore) must be kept absolutely secure: losing it means that you will not be able to update the application in the future on behalf of the current developer.
Instead of a universal APK file, Google strongly recommends using the format Android App Bundle (.aab). This format allows the store to automatically generate and give the user only those resources and code that are needed specifically for his specific device model. This significantly reduces the size of the downloaded file and saves user traffic.
Before submitting for moderation, check the application for compliance with Google Play policies. Pay special attention to permissions: request access to contacts, camera or geolocation only if it is critical for the function to work, and justify this in the application description. Unfounded rights requests are a common reason for moderation rejection.
Using the .aab format instead of .apk can reduce the download size for the user by up to 30-50%, which directly affects install conversion.
⚠️ Attention: App store policies and data privacy requirements are updated regularly. Before publishing, be sure to check the latest requirements in the Google Play Developer Console to avoid account suspension.
Frequently asked questions (FAQ)
How much does it cost to publish an app on Google Play?
Publishing apps requires a one-time registration fee of $25. Once paid, your developer account remains active indefinitely, and you can publish an unlimited number of applications without additional monthly payments (except for sales commission if the application is paid).
Do I need to know Java if I want to write in Kotlin?
No, knowledge of Java is not required to start working with Kotlin. While both languages run on the JVM and are interoperable (can call each other), Kotlin is the more modern, concise, and secure language that Google has recognized as the language of choice for Android development. You can learn Kotlin from scratch.
Is it possible to create an Android application in Python?
There is no direct way to create a native Python application for publishing on Google Play. However, you can use frameworks like Kivy or BeeWare, which allow you to write code in Python and compile it into an APK. Python is also often used on the server side (backend), with which the mobile application communicates.
How long does it take to moderate an application on Google Play?
Moderation time can vary from several hours to several days. For new developer accounts, the verification process may be more thorough and may take up to 7 days. Old accounts with a good reputation usually undergo verification faster, sometimes within 24-48 hours.