resume method

void resume()

Implementation

void resume() {
  if (!onPausedCalled) {
    return;
  }
  if (timerHandler.remainingSeconds > 0) {
    _countdownSeconds = timerHandler.remainingSeconds;
    start();
  } else {
    stop();
    _onTick!(_countdownSeconds); //callback
  }
  onPausedCalled = false;
}