Developing a game on Android: where to start for a beginner

Creating your own video game for the most popular mobile platform in the world is an exciting but complex path that requires a systematic approach. Many enthusiasts are excited about the idea of ​​becoming the next indie developer, but face the first obstacles already at the stage of choosing tools. Developing a game for Android, where to start - this question worries thousands of beginners who want to turn their idea into a working product available to millions of users.

The process of creating software for mobile devices is radically different from writing simple applications or scripts. You'll dive into the world of game loops, graphics rendering, physics collision handling, and optimization for hundreds of different screen and processor configurations. However, thanks to modern technologies, the barrier to entry has been significantly lowered, and today even one person can create a hit using the right tools and techniques.

In this article, we will analyze the fundamental steps necessary to start your project, from choosing a programming language to publishing the build in the app store. We will not delve into the complex mathematical formulas of shaders or the architecture of neural networks, but will focus on practical aspects that will allow you to see the result of your work on the smartphone screen in the first weeks of training.

Choosing a game engine and development tools

The first and most critical decision is the choice game engine. This is a software environment that takes care of routine tasks: rendering frames, calculating physics, and managing resources. For a novice developer, trying to write your own engine from scratch is a sure way to lose motivation after a couple of months, since you will not be creating a game, but writing code to run it.

The modern market offers several powerful solutions, each of which has its own advantages. Unity remains the gold standard of the industry thanks to the huge community, plenty of training materials and support for the C# language. Another popular option is Unreal Engine, which is famous for its graphics and Blueprints visual programming system, which allows you to create game logic without writing code. For those who prefer an easy start and 2D graphics, an excellent choice would be Godot or Construct 3.

⚠️ Attention: The choice of engine determines your entire future career. If you plan to focus on high-budget 3D graphics, look towards Unreal. For mobile casual games and a wide range of 2D/3D projects, Unity is often a better choice due to the lighter weight of the final application.

In addition to the engine itself, you will need an integrated development environment (IDE). For working with C# in the Unity ecosystem, the de facto standard is Visual Studio or a more lightweight Visual Studio Code. These tools provide syntax highlighting, code completion, and built-in debuggers that are critical for finding errors. Installing the right software is the basis without which further progress is impossible.

Setting up the environment and installing the Android SDK

After installing the game engine, you need to prepare the environment for building and testing applications directly on Android devices. The key component here is Android SDK (Software Development Kit). Most modern engines, such as Unity, offer to install the necessary components automatically the first time you run the Android support module, but understanding the structure of this process is important for solving future problems.

SDK includes platforms (versions of Android), build tools and emulators. The emulator allows you to run the game on your computer without connecting a physical phone, which is convenient for quickly testing mechanics. However, there is no substitute for testing on a real device, as emulators often do not accurately reflect performance and touch controls. You will need to enable developer mode on your smartphone and activate USB debugging.

The process of connecting the device is as follows:

• 📱 Go to Settings → About the phone and tap 7 times on the build number to unlock the developer menu.
• ⚙️ Go to the section that appears For developers and enable the item USB debugging.
• 🔌 Connect the phone to the computer with a cable and confirm permission debugging in a pop-up window on the smartphone screen.

In the settings of your game engine, you must specify the path to the installed SDK. In Unity this is done through the menu Edit → Preferences → External Tools → Android SDK Location. If the path is correct, the engine will see the connected device in the list of available platforms for assembly. Remember that building for Android requires the installed JDK (Java Development Kit), usually version 11 or higher, depending on the engine version.

Game Logic Programming Basics

The heart of any game is its code. Even if you use visual scripts, understanding algorithmic logic is essential to creating complex systems. In the context of Android development on the Unity engine, the main language is C#. You don't need to be a programming expert to get started, but the basic concepts of variables, loops, conditions and functions are a must.

Game logic is built around the concept of "GameObject" and "Component". A script is also a component that you attach to an object to give it behavior. For example, to make a character move, you create a script PlayerController and add it to the player object. Inside the script, you describe how the object reacts to screen taps or the gyroscope.

Let's look at a simple example of input processing. In the method Updatethat is called every frame, we check the state of the touch screen:

void Update() {
if (Input.touchCount > 0) {
Touch touch = Input.GetTouch(0);
if (touch.phase == TouchPhase.Began) {
Jump();
}
}
}

This code causes the character to jump the first time the screen is touched. Understanding the life cycle of methods such as Start (called once at startup) and Update (called constantly) is critical to the correct operation of the game.

You should not try to learn the entire language at once. Focus on what is needed for a specific mechanic. If you're making a runner, learn how to work with physics and prefabs. If it's an RPG, deal with data sets and inventory. The practice of writing code for a specific task is learned much faster than abstract reading of textbooks.

What is a prefab?

Prefab is a game object template saved in a separate file. You can create a complex enemy with health, animation, and weapon settings, save it as a prefab, and then instantly create hundreds of copies of it in the game by simply dragging the template onto the stage. Changes in the prefab itself are automatically applied to all its copies.

Working with graphics, sound and interface

The visual component and sound create the atmosphere of the game. For Android devices, resource optimization is critical. Using textures that are too high resolution (for example, 4K) for mobile screens will quickly fill up the RAM and cause the application to crash. It is necessary to maintain a balance between image quality and performance.

When importing assets into the engine, you should adjust the compression settings. For Android, the format is usually used ASTC or ETC2, which provide good quality with a low file weight. It is better to convert audio files to Vorbis format with a bitrate of 128 kbps for music and higher for important sound effects. The interface (UI) must be adaptive, since the aspect ratio of screens on Android varies from the old 16:9 to the modern elongated 20:9.

The table below shows the recommended settings for importing resources for the mobile platform:

Resource type	Recommended resolution	Compression format	Features
Textures (Sprites)	1024x1024 or 2048x2048	ASTC 6x6	Enable Mip Maps for 3D objects
Textures (UI)	By element size	ASTC 4x4	Without Mip Maps, Point mode (No Filter)
Audio (Music)	-	Vorbis (128 kbps)	Streaming mode (loading from disk)
Audio (SFX)	-	Vorbis / PCM	Decompress On Load mode (to memory)

It is also important to consider the variety of devices. What looks sharp on a flagship with an OLED screen may look washed out on a budget device with an IPS panel. Always test the color scheme and contrast of the interface on different types of displays. Use engine profiler tools to monitor graphics memory consumption in real time.

Optimization and testing on real devices

Optimization is the stage that separates an amateur project from a professional product. Mobile devices have limited battery and cooling resources. If your game makes your phone hot like an iron or drains your battery in 30 minutes, users will uninstall it immediately, regardless of the quality of the gameplay. The main goal is stable 60 FPS (frames per second) or at least stable 30 FPS on older devices.

The main performance drains are the number of objects in the scene (Draw Calls), complex shaders and physics. Use the "Object Pooling" technique instead of constantly creating and destroying objects, such as bullets or enemies. This reduces the load on the Garbage Collector, which can cause micro-freezes (slowdowns) during operation.

⚠️ Attention: Never optimize the game, focusing only on the developer’s powerful computer. What runs smoothly on your PC with an RTX 4090 graphics card can turn into a slideshow on a three-year-old smartphone. Testing on a “weak” device is mandatory.

To analyze performance, use built-in tools, such as Unity Profiler or Android Profiler in Android Studio. They will show which script or function is loading the processor. It often turns out that the problem lies in an unoptimized loop that runs thousands of times per frame. Eliminating such bottlenecks can increase performance significantly without changing graphics.

Publishing on Google Play and monetization

The final stage is the release of the game users. For publication in the store Google Play You must register a developer account. This is a paid procedure: a one-time fee is $25. After registering, you get access to the developer console, where you upload your APK or AAB file, fill out a description, upload screenshots and indicate the age rating.

The moderation process on Google Play has become stricter. Your game must comply with content policies, not infringe copyrights, and not contain malicious code. Particular attention is paid to the Data Security section, where you must be honest about what user data your app collects. If the game contains advertising or purchases, this must also be declared.

There are several monetization models:

• 💰 Paid: The game is paid for downloading. Suitable for unique projects with a loyal audience, but it is difficult to attract new users.
• 📺 Advertising: Free game with advertising (banners, interstitial advertising, rewarded videos). The most popular option for hyper-casual games.
• 💎 In-App Purchases: Internal purchases (currency, skins, disabling advertising). Requires complex economics and balance so as not to scare away players.

The success of a game depends not only on the quality of the code, but also on marketing. ASO (App Store Optimization) - the process of optimizing an application page in the store - plays a key role. Correctly selected keywords in the title and description, an attractive icon and high-quality screenshots can increase the number of organic downloads significantly.

Do you need to know Java or Kotlin to develop games in Unity?

No, it is not necessary. Unity uses the C# language to write game logic. Java and Kotlin may only be needed if you decide to write your own native plugins for specific Android functions that are not supported by the engine out of the box, but for 95% of tasks, knowledge of C# is sufficient.

How long does it take to create your first simple game?

For a beginner, creating a prototype of a simple game (for example, a clone of Flappy Bird or Arkanoid) can take from 1 to 4 weeks, subject to training for 2-3 hours a day. Creating a full-fledged commercial product with polish, sound and menus usually takes from 3 to 6 months or more.

Is it possible to develop games on Android without a powerful computer?

Yes, you can. For 2D games and simple 3D projects, a modern laptop with integrated graphics and 8-16 GB of RAM is sufficient. A powerful video card is needed mainly for working with heavy 3D graphics, complex lighting and rendering high-quality textures.

What is an AAB file and how does it differ from an APK?

AAB (Android App Bundle) is a new publishing format on Google Play. Unlike APK, which is a universal installation file, AAB allows the store to generate and give the user an optimized APK specifically for his device model, excluding unnecessary resources (for example, textures for unsupported processors), which reduces the size of the downloaded file.