[Flutter] Flutter: How can I prevent default behaviour on key press?

I'm trying to intercept when a user presses the volume buttons to perform a specific action and prevent the default behaviour (volume changes).

This is the code I have so far:

RawKeyboard.instance.addListener(_keyboardListener);

void _keyboardListener(RawKeyEvent e) {
if(e.runtimeType == RawKeyUpEvent) {
RawKeyEventDataAndroid eA = e.data;
if(eA.keyCode == 24) { //volume up key
_goNextPage();
}
if(eA.keyCode == 25) { //volume down key
_goPrevPage();
}
}
}


How would I go about preventing the volume from changing (and stopping the volume slider from appearing at the top)?

A Javascript analogous would be calling event.preventDefault() on the key event.

This seems to be a rather trivial matter, but I haven't been able to find any answers in the docs.

Thanks.

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