Mobile application development ceased to be the lot of select programmers a few years ago. Today, any enthusiast, armed with a computer and the desire to create, is able to turn his idea into a full-fledged product that will be seen by millions of users. Creating a game on Android is a fun process that combines programming logic, artistic design and engineering thinking. The path from a blank screen to a working APK file may seem complicated, but with the right preparation it becomes clear and structured.
You don't have to know complex algorithms by heart or be a math genius to get started. Modern tools automate routine processes, allowing you to focus on gameplay and visual components. However, it is important to understand that “making a game” is not just about drawing a character. This is creating the application architecture, setting up physics, managing memory resources and adapting to hundreds of different smartphone models. In this article we will analyze each stage of creating a product, from choosing a concept to uploading a build to the developer console.
Selecting a game engine and preparing the environment
The first and most critical step is the choice game engine. This is the software environment in which all the magic will happen: assembling scenes, setting up physics and writing scripts. For mobile development on Android, there are several market leaders, each of which has its own advantages and disadvantages. Beginners are often recommended to start with engines that have a low entry threshold, but at the same time provide the opportunity for professional growth.
The most popular choice remains Unity. It uses the C# programming language, which is strict but very powerful. The huge community and thousands of ready-made assets make it ideal for indie developers. An alternative is Unreal Engineworking on C++ or the Blueprints visual system. It produces stunning graphics, but can be overly heavy for simple mobile projects. It is also worth paying attention to Godot - a lightweight, open engine with its own GDScript language, reminiscent of Python.
After choosing a platform, you need to prepare a workplace. Installing software requires attention to system requirements. For comfortable work, you will need a computer with sufficient RAM (at least 8 GB, preferably 16 GB) and a discrete video card. Don't forget to also install Android SDK and Java Development Kit (JDK)as they are required to compile the code for the Google platform.
Download Unity Hub or Unreal Launcher only from the official developer sites to avoid malicious modifications in the installers.
Basics of gameplay design and mechanic
Before writing the first line of code, you need to clearly understand what exactly the user will play. Game design is the foundation on which the entire application building is built. A mistake in mechanical planning early on can result in half the project having to be rewritten months later. Therefore, professionals begin by creating a design document or at least a detailed sketch on paper.
The document should describe the main goal of the game, the control system and the cycle of interaction between the player and the world. Will it be an endless runner where you have to dodge obstacles, or a turn-based strategy? It is important to determine core loop (main cycle) - a repeated action that brings pleasure. For example: “saw the enemy → took aim → shot → received a reward.” If this cycle does not work, no amount of beautiful graphics will save the project.
⚠️ Attention: Do not try to implement all your ideas at once in the first project. Overloaded functionality often leads to bugs and long development. Start with one working mechanic and bring it to perfection.
Control on touch screens has its own specifics. Unlike a PC, which has a keyboard and mouse, a smartphone does not have physical buttons. You will have to design virtual joysticks, buttons or use swipes. The interface should be ergonomic: important controls should not be blocked by the player's fingers during the active phase of the game. Test the placement of buttons on different screen diagonals.
Golden rule of prototyping
First create a “greybox” - a level of simple cubes and cylinders without textures. If this version is fun to play, then the mechanics work. Only after this add graphics and sounds.
Setting up a project and importing resources
When the concept is approved and the engine is installed, it’s time to create a new project. In the project settings, it is critical to immediately set the correct parameters for the Android platform. This includes selecting the screen orientation (portrait or landscape), the target API version, and the minimum supported system version. It is usually recommended to focus on API Level 24 (Android 7.0) as a minimum in order to cover the majority of active devices.
The next stage is filling the game with content. You will need 2D sprites or 3D models, sound effects and background music. All these files must be optimized. Heavy textures in .PNG format without compression will quickly “eat up” the smartphone’s RAM and cause application crashes. Use compression formats supported by the engine, for example ASTC or ETC2 for textures.
The folder structure in the project should be logical and orderly. Chaos in the files will make further development difficult, especially if you decide to add new levels or characters. It is recommended to immediately create a standard hierarchy: for code, for object templates, for levels and for sounds. Discipline in organizing files saves hours of searching for the right asset in the future. Scripts for the code, Prefabs for object blanks, Scenes for levels and Audio for sounds. Discipline in organizing files saves hours of searching for the right asset in the future.
☑️ Preparing assets for import
Programming logic and physics
The heart of any game is its code. Even visual constructors hide logic that someone must write down. W Unity you will work with C# scripts that are attached to game objects as components. The main task at this stage is to implement the interaction between objects: how a character jumps, how a bullet destroys an enemy, how a coin is collected.
The physics engine takes care of calculating collisions and gravity, but you need to correctly configure the colliders (invisible shells of objects). If the character's collider is too large, he will get stuck in the doors; if it's too small, bullets will fly through it. It is important to distinguish triggers (zones that fix the entrance, but do not have physical hardness) and solid bodies. For mobile phones, physics should be simplified so as not to load the processor.
void OnCollisionEnter(Collision collision) {if (collision.gameObject.tag =="Enemy") {
TakeDamage(10);
}
}
Code optimization plays a key role in performance. Avoid heavy calculations inside a method Updatethat is called every frame (60 times per second). Instead, use events or timers for infrequent checks. Do not create new objects in a loop if you can avoid it, as this puts a load on the Garbage Collector, which leads to micro-freezes (slowdowns) of the game.
Use Object Pooling for frequently created and destroyed elements, such as bullets or particles. This significantly increases FPS on weak devices.
Testing on real devices and debugging
An emulator built into the development environment is useful for quickly testing logic, but it cannot replace testing on real hardware. The behavior of the game on a powerful PC and on a budget smartphone can be radically different. Connect your phone to the computer via a USB cable, enable the USB debugging mode in the developer settings on Android and run the build directly to the device.
During the testing process, pay attention not only to errors, but also to the heating of the case and battery consumption. If the phone gets hot after 5 minutes of playing, then your code or graphics are too demanding. Use the engine's built-in profilers (such as Unity Profiler) to find bottlenecks. Often the problem lies in an excessive number of light sources or unoptimized shaders.
| Problem type | Possible cause | Solution method |
|---|---|---|
| Low FPS | Too many objects on screen | Use LOD (Level of Detail) and occlusion |
| Application crash | Out of memory (OOM) | Compress textures, remove unnecessary assets from the scene |
| Lags controls | Heavy calculations in the rendering thread | Move logic to a separate thread or optimize the code |
| Graphics artifacts | Unsupported compression format | Check the build settings for specific GPU (Adreno/Mali) |
⚠️ Attention: Always test the game on devices with different versions of Android and different processors (Snapdragon, MediaTek, Exynos). What works on a Samsung flagship may not work on an old Xiaomi.
Publishing on Google Play and monetization
The final stage is reaching the audience. To publish to the Google Play Store, you will need to register in the Developer Console. This is a paid procedure: you must pay a one-time fee of $25. After registration, you create an application, upload an APK or AAB file signed with a release key, fill out a description, upload screenshots and indicate the age rating.
The moderation process at Google takes from several days to a week. Robots and live moderators check the application for compliance with security and content policies. A common reason for rejection is a violation of intellectual property rights or the presence of malicious code. Make sure that all assets used are legal and the app does not ask for unnecessary permissions (for example, access to contacts for a simple arcade game).
What is an AAB file?
Android App Bundle (.aab) is a new publishing format that allows Google Play to automatically generate optimized APKs for a user's specific device, reducing the download size file.
The issue of monetization should be resolved before the release. You can make the game completely free with advertising (AdMob, Unity Ads), implement in-game purchases (IAP) or sell the game for a fixed price. The "Free-to-Play" hybrid model with the ability to turn off advertising for money is now the most popular. Integrating ad network SDKs is usually straightforward if you follow the official documentation.
Before publishing, be sure to create a separate branch in the version control system (Git) for the release build. Never lose your source code and signing keys—without them, you won't be able to update your app in the future.
Do you need to know math and physics to create games?
A basic understanding of vectors and coordinates is necessary, but modern engines take on complex calculations. For simple 2D games, the school curriculum is enough; for complex 3D projects, knowledge of linear algebra may be required.
How long does it take to create the first game?
A simple clone of a famous arcade game (for example, Flappy Bird) can be made in a weekend. A full-fledged project with unique graphics and several levels will take a beginner from 1 to 6 months.
Is it possible to create games on a phone?
Technically, yes, there are applications like Julia or ports Unity for Android, but this is extremely inconvenient. A keyboard, mouse, and large monitor are critical for productive development.
Where can I get graphics and sounds if I'm not an artist?
Use free asset stores (Unity Asset Store, itch.io), sprite generators, or hire freelancers. The main thing is to comply with licenses for using other people's content.