start method

dynamic start()

Implementation

start() async {
  if (_init ?? false) {
    // 避免重复初始化
    return;
  }
  _timer = Timer.periodic(Duration(seconds: 1), (timer) {
    //时间达到一秒了，开始计算这一秒的帧率
    _calFps();
  });
  _registerListener();

  // 获取当前手机的fps
  if (_fpsHz == null) {
    _fpsHz = await FpsPlugin.getRefreshRate;
  }

  _init = true;
}