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Android touch events include updates to multiple pointers, but each pointer data message sent from the embedder to the framework represents a single pointer. So the Android embedder will send multiple messages for each touch event, and the framework's AndroidViewController will reassemble the messages and forward the resulting event to the platform view. The AndroidViewController tracks the number of active pointers in its own local state. If that state is out of sync with the event handled by the Android embedder, then the AndroidViewController may send duplicate events to the platform view. This PR encodes the Android touch event's pointer count in the messages sent to the framework. This allows the AndroidViewController to reliably determine whether it has received all of the pointer messages that originated from an event. Fixes https://github.com/flutter/flutter/issues/176574
Flutter Engine
The Flutter Engine is a portable runtime for hosting Flutter applications. It implements Flutter's core libraries, including animation and graphics, file and network I/O, accessibility support, plugin architecture, and a Dart runtime and compile toolchain. Most developers will interact with Flutter via the Flutter Framework, which provides a modern, reactive framework, and a rich set of platform, layout and foundation widgets.
More tooling is available to make development experiences easier:
| Target | Tool |
|---|---|
| Web | felt |
| Mobile or Desktop | et |
To learn about running tests, see testing the engine.