How to port a game to Android in Clickteam Fusion

⚠️ Attention: Android SDK versions and Google Play Console requirements are updated regularly. Before starting work, be sure to check the official Clickteam documentation and application store requirements.

Transferring a finished project from the development environment Clickteam Fusion to the platform Android opens access to a huge audience of mobile users. This process, often called porting, requires not just pressing one button, but carefully preparing the environment, setting build parameters and understanding the architecture of mobile devices. Successful export depends on the correct installation of the Java Development Kit and Android SDK, which serve as the foundation for compiling your application.

Many developers encounter difficulties already at the stage of setting up paths to system libraries. Errors in the configuration can lead to the fact that the builder simply does not see the necessary components or produces a critical compilation error. It is important to understand that Clickteam Fusion is only a shell that generates code, and all the hard work of creating an APK file is done by external tools from Google and Oracle.

In this guide, we will analyze each step of turning your desktop project into a full-fledged mobile application. You'll learn how to avoid common pitfalls when setting up a manifest, optimize graphics for different screens, and prepare a digital certificate for signing a release version. A competent approach to these steps will save you hours of debugging and nerves in the future.

Preparing the working environment and installing the SDK

The first and most critical step is to install the correct software. Without correctly configured Java Development Kit (JDK) i Android Software Development Kit (SDK) export is impossible. It is recommended to use specific versions that are compatible with your version of the engine, as new JDK updates sometimes break backward compatibility with older builders.

After downloading the installation files, you need to unpack them into paths that do not contain spaces or Cyrillic characters. This is a common cause of error that beginners overlook. The build system is sensitive to folder names, and the type path C:\app Files\Android\SDK may cause a failure, while C:\AndroidSDK will work correctly.

Next you need to open the settings of the engine itself. Go to menu File → Preferences → Android. Here you have to specify the paths to the installed components. The fields must be filled in absolutely accurately, including the name of the folder with the specific version of the platform, for example android-30.

• 📂 Make sure that the path to the JDK leads to the folder with installed Java, and not to a shortcut.
• 🔧 In the SDK settings, select the Target Platform corresponding to the minimum version of Android that you want to support.
• 📝 Check the presence build-tools in the SDK folder, since without them the compilation will not start.

⚠️ Attention: If you are using a 64-bit version of Windows, make sure that the 64-bit version of the JDK is installed. Incompatibility of system bitness often leads to an "Invalid signature file" error during build.

Configuring application and manifest properties

Before To run the build, you need to configure your project metadata. This data will be displayed in the app store and on the user's system. In application properties (Application Properties) you specify a Package Name, which must be unique and follow the reverse domain format, for example com.yourname.gamename.

Pay special attention to screen orientation and resolutions. Mobile devices have a huge variety of aspects, from elongated modern screens to classic tablets. In the frame settings (Frame Properties) you can set the scaling mode. Using the mode Resize Window or Scale to Fit allows the game to adapt to different displays without distortion.

Permissions are also configured in this section. By default, the engine requests a minimum set of rights, but if your game uses vibration, Internet access for leaderboards, or saving data to external storage, this must be explicitly specified. The absence of the required flag in the manifest will cause the application to crash when trying to use the function.

Optimizing resources for mobile devices

Mobile platforms have memory and processor performance limits that are significantly stricter than PCs. What flies on a desktop may slow down on a mid-range smartphone. The main task is to optimize the graphics. Uncompressed PNG images take up a lot of RAM space, which is critical for Android.

Use built-in texture compression tools or external utilities before importing into a project. For backgrounds and large sprites, you can reduce the color depth to 16 bits if the visual difference is not noticeable. It's also worth checking the sprite sizes: it makes no sense to use a 4096x4096 texture for a 100x100 pixel UI element.

Sound resources also require conversion. The WAV format is great for development, but for final builds on Android, it's better to use compressed formats like OGG or MP3 to reduce the size of the final APK. The engine allows you to configure global audio compression settings in the application properties.

• 🖼️ Avoid using textures larger than 2048x2048 unless this is critical for quality.
• 🔊 Convert long music tracks to OGG format to save space.
• ⚡ Disable unnecessary particle effects on weaker devices through conditions in events.

⚠️ Warning: Excessive use of objects with "Bounce" movement or complex physics calculations can be very CPU intensive. Test the game on a real device, not just in an emulator.

APK building process and versioning

When the project is optimized and the settings are checked, the moment of truth comes - assembly. In the menu File → Build → Android Application you select the type of assembly. The Debugmode is suitable for testing, which allows you to run the application with debugging and display error logs. To publish to the store, the mode is required Release.

Release mode requires a digital signature key (Keystore). This is a file with the extension .keystore or .jksthat contains the developer's private key. If you lose this file, you will never be able to update your app on Google Play because the signature must match. Create it through the utility keytool or the build interface and save it in a safe place.

During the build process, the engine generates intermediate files, compiles Java code and packages resources. This process can take anywhere from a few seconds to minutes depending on the power of your computer and the size of your project. In case of an error, carefully read the log file, which usually opens automatically - the line of code or object that caused the failure will be indicated there.

Path to the key: C:\Keys\my_game_key.keystore
Key alias: my_alias
Storage password: 

Key password: