BepInEx Android Launcher

Android launcher app for running BepInEx mods in Unity IL2CPP games.

Features

• One-click BepInEx injection into Unity IL2CPP games (Among Us, etc.)
• Modpack manager: create, import/export, enable/disable mod sets
• Config file editor with syntax highlighting
• Game-side log viewer (logcat integration)
• Google OAuth login support for Among Us (AuthFix plugin)

How it works

The launcher uses Pine (ART hook framework) to intercept the game's ClassLoader, native library loading, and UnityPlayer initialization. A custom libmain.so and libfusion.so control the dlopen order to install an il2cpp_init hook before Unity starts. The hook launches CoreCLR and the BepInEx preloader.

Requirements

• Android 9+ (API 28+)
• arm64-v8a device
• Unity IL2CPP game installed

Building

MSYS_NO_PATHCONV=1 ./gradlew assembleDebug

Requirements: Android SDK 35, NDK 27.0.12077973, CMake 3.22.1, JDK 17.

Project structure

app/src/main/
  cpp/          Native code (libmain.so, libfusion.so)
  java/         Kotlin launcher UI and injection logic
  assets/       BepInEx framework and .NET runtime archives
  res/          UI strings (EN + zh-CN)
AuthFixPlugin/  Among Us Google login fix (BepInEx plugin)
build_assets/   BepInEx core files for packaging

Related projects

• NextBep/BepInEx.Android — BepInEx fork for Android
• NextBep/runtime — dotnet/runtime fork with Android fixes
• Starlight's FusionCore (reference implementation)

License

GNU General Public License v3.0