- Qt 6.6
- Qt for Android: How It Works
- Qt 6.6.1 Reference Documentation

# Qt for Android: How It Works

If you're a developer looking for a high level overview of how Qt supports the Android platform, this page is for you.

The video from the 2021 Qt World Summit gives an overview of Qt for Android.

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## Architecture

### Activities

The implementation of Qt for Android is made up of three main parts, and the glue in between:

- Qt Core
- the Android QPA plugin
- The Java Android code

- The default entry point for a Qt app is the QtActivity, which upon starting, will call the QtActivityLoader which will try to load the application by calling the QtActivityDelegate.
- QtActivityDelegate will make the necessary calls to load the Qt libraries and the main app library with the help of QtNative.
- QtNative handles the various Java operations that don’t need to be exposed, such as: loading the libraries and handling files.
- The QtActivityDelegate also handles the different listeners and input handlers and propagate them from Java to Qt.

### Services

The architecture here is similar to that of Activities, but with services specific classes.

For information on how Qt supports Services in Android see Android Services.

## Build configuration

For more information on configuration Qt for Android Builds see Environment Variables Used by Qt for Android and {Qt for Android: CMake}.