RawKeyboardListener允许这样做https://docs.flutter.io/flutter/widgets/RawKeyboardListener-class.html
var _focusNode = FocusNode();
@override
Widget build(BuildContext context) {
return RawKeyboardListener(
child: Text('raw keyboard input'),
focusNode: _focusNode,
onKey: _onRawKeyEvent,
);
}
void _onRawKeyEvent(RawKeyEvent event) {
..
}
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