Extend the default Unity activity

The UnityPlayerActivity of a Unity Android application is responsible for basic interactions between the Android operating system and the application. You can use plug-insA set of code created outside of Unity that creates functionality in Unity. There are two kinds of plug-ins you can use in Unity: Managed plug-ins (managed .NET assemblies created with tools like Visual Studio) and Native plug-ins (platform-specific native code libraries). More info
See in Glossary to create your own Activity that extends and overrides Unity’s default UnityPlayerActivity.

Notes:

• If you’re creating a custom activity with GameActivity application entry point, you need to extend the UnityPlayerGameActivity class.
• UnityPlayerActivity and UnityPlayerGameActivity use the UnityPlayerForActivityOrService and UnityPlayerForGameActivity bridge classes respectively. Unity splits these bridge classes from the UnityPlayer Java class. To create a custom activity, extend UnityPlayerActivity or UnityPlayerGameActivity and not the bridge classes. If your activity code references the UnityPlayer class directly, rename it to the relevant bridge class to avoid compile errors.

Additional resources

• Android plug-ins