我是怎么做到的：

onLongPress: () {
                Timer(Duration(milliseconds: (longPressIncrementDuration > 500) ? longPressIncrementDuration - 500 : 0), //enter function here//);

// I subtract 500 ms from required time limit as longpress on flutter activates after 500ms
              },

您可以通过这种方式解决问题，使用带有计时器的GestureDetector的onPanCancel和onPanDown。

class _MyHomePageState extends State<MyHomePage> {
  Timer _timer;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      floatingActionButton: GestureDetector(
        onPanCancel: () => _timer?.cancel(),
        onPanDown: (_) => {
          _timer = Timer(Duration(seconds: 3), () { // time duration
            // your function here
          })
        },
      ),
    );
  }
}

让我知道它是否适合你。

我今天做了一个包，你可以设置手势检测器的持续时间。如果你想，你可以试试https://pub.dev/packages/custom_long_tap

GestureDetector(
      onTapDown: (_) { //Detect when you click the element
        _timer = Timer(
          const Duration(seconds: 5),
          () {
            Navigator.push(
              context,
              MaterialPageRoute(
                builder: (context) => const ListOrder(),
              ),
            );
          },
        );
        print('tapping');
      },
      onTapUp: (_) { // Detect and cancel when you lift the click
        _timer!.cancel();
        print('cancel');
      },
      child: const Icon(Icons.person_search),
),