GameActivity   Part of Android Game Development Kit.

GameActivity is a Jetpack library designed to assist Android games in processing app cycle commands, input events, and text input in the application's C/C++ code. GameActivity is a direct descendant of NativeActivity and shares a similar architecture:

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As illustrated in the above diagram, GameActivity performs the following functions:

  • Interacting with Android framework through the Java-side component.
  • Passing app cycle commands, input events, and input text to the native side.
  • Modelling C/C++ source code into three logical components:
    • GameActivity’s JNI functions, which directly support GameActivity’s Java functionality and enqueue the events to native_app_glue.
    • native_app_glue, which runs mostly in its own native thread (different from the application’s main thread), and executes tasks with its looper.
    • The application's game code, which polls and processes the events queued inside native_app_glue and executes game code within the native_app_glue thread.

With GameActivity, you can focus on your core game development and avoid spending excessive time dealing with the JNI code.

If you are already familiar with NativeActivity, the major differences between GameActivity and NativeActivity are as follows:

  • GameActivity renders into a SurfaceView, making it much easier for games to interact with other UI components.
  • For touch and key input events, GameActivity has a completely new implementation with the android_input_buffer interface, separate from the InputQueue that NativeActivity uses.
  • GameActivity is a derived class of AppCompatActivity, which lets you seamlessly use other Jetpack components. ActionBar, Fragment, and others are all available.
  • GameActivity adds text input functionality by integrating the GameTextInput library.
  • Apps derived from GameActivity are expected to build all three parts of C/C++ code into one library. On the other hand, NativeActivity's JNI functions are a part of the framework (always loaded by OS). Hence, only the native_app_glue and application’s C/C++ code are expected to be built into one library.
  • NativeActivity is a part of Android framework and follows its release cycle (typically yearly). GameActivity is a part of the Jetpack library, which has a much more frequent release cycle (typically biweekly); new features and bug fixes can arrive much more quickly.

We strongly recommend using GameActivity for new games and other C/C++ intensive applications. If you have an existing NativeActivity application, we recommend migrating.

Follow those guides to integrate GameActivity into your applications:

To report bugs or request new features to GameActivity, use the GameActivity issue tracker.