touch-handling

Documentation

Overview

Touch and key input event handling example.

Demonstrates the complete input event processing pipeline using the ndk/input package. On Android, input events (touches, key presses) are delivered through an AInputQueue that the framework attaches to the Activity. This example shows:

• How to wrap a raw AInputQueue pointer into an input.Queue.
• The full event polling loop: HasEvents -> GetEvent -> PreDispatchEvent -> handle -> FinishEvent.
• Dispatching key events (action, keycode, repeat count).
• Dispatching motion/touch events (action, pointer count, per-pointer x/y coordinates and pressure).
• How to integrate the input queue with an ALooper for continuous event-driven processing (documented in comments).

The event loop runs against a nil queue pointer in this example, so HasEvents returns an error immediately and no events are delivered. In a real NativeActivity the queue pointer comes from the framework via the onInputQueueCreated callback.

This program must run on an Android device.