These two intrinsics report different types of time. system_clock reports “wall time” or elapsed time. cpu_time reports time used by the CPU. On a multi-tasking machine these could be very different, e.g., if your process shared the CPU equally with three other processes and therefore received 25% of the CPU and used 10 cpu seconds, … Read more
A simple option is to manually keep track of time using millis(). You would use two variables: one to store elapsed time one to store the wait/delay time you need In the draw() method you would check if the difference between the current time (in millis.) and the previously stored time is greater(or equal) to … Read more
Here is an example using Timer.periodic : Countdown starts from 10 to 0 on button click : import ‘dart:async’; […] Timer _timer; int _start = 10; void startTimer() { const oneSec = const Duration(seconds: 1); _timer = new Timer.periodic( oneSec, (Timer timer) { if (_start == 0) { setState(() { timer.cancel(); }); } else { … Read more