Glossary

Term	Meaning & Context
ABI	Application Binary Interface; the CPU target architecture an Android native library compiles for (e.g., arm64-v8a for 64-bit phones, x86_64 for emulators).
adb	Android Debug Bridge; the host command-line utility used to communicate with and control authorized Android devices.
APK	Android Application Package; the file format used to install apps directly onto Android devices.
AAB	Android App Bundle; the format required by modern app stores (such as Google Play) to generate architecture-optimized split APKs.
Callback	A Python function or callable invoked in response to a user action (such as on_tap or on_change).
Class String	The utility string (e.g. "flex-1 p-4 bg-slate-900") passed as the first positional argument to describe layout and styling.
Controlled Input	A form control whose displayed value and selection are bound to observable application state.
Development Preview	The temporary testing app instance deployed by zkite dev for live source syncing and hot reload.
Hot Reload	The instantaneous update of the running interface on device upon saving Python source files.
Key	A unique, stable identity passed to a widget to maintain its internal state across UI tree reconciliations.
Native Rendering	Drawing interfaces directly using native Android UI views and canvas, rather than inside a web browser viewport.
Package ID	Android’s unique reverse-domain identifier for an application (e.g. com.company.app).
Payload	Prebuilt native Android runtime components distributed with ZKite.
Signing Identity	The private cryptographic key and certificate used to sign Android APKs and AABs.
Store	An observable in-memory class managing reactive application state.
System Bars	Android’s status bar (top clock/battery) and navigation bar (bottom gestures/buttons).
Virtual List	A list container that instantiates only the currently visible rows to maintain optimal memory and frame rates.
Widget Tree	The hierarchical composition of widgets that declares the current screen interface.