in TwoWaySample/app/src/main/java/com/example/android/databinding/twowaysample/data/IntervalTimerViewModel.kt [181:191]
fun stopButtonClicked() {
resetTimers()
numberOfSetsElapsed = 0
state = TimerStates.STOPPED
stage = StartedStages.WORKING // Reset for the next set
timer.reset()
notifyPropertyChanged(BR.timerRunning)
notifyPropertyChanged(BR.inWorkingStage)
notifyPropertyChanged(BR.numberOfSets)
}