onTapListening method
void
onTapListening()
Implementation
void onTapListening() {
final now = DateTime.now().millisecondsSinceEpoch;
if (_lastTapTime > 0 && now - _lastTapTime > maxMillisecondsBetweenTwoTaps) {
_record(time: now, count: 1);
} else {
_record(time: now, count: _numberOfTapRecorded + 1);
_checkAvailable();
}
}