如何测量用户按下按钮的时间？

Question

我尝试使用计时器 class，但它仅从固定持续时间 AFAIK 开始倒计时。我有一个按钮，用户可以单击它或长按并按住它 X 秒，最多 10 秒。我已经弄清楚了单击代码，但是如果用户按下并按住按钮，我想记录他按住按钮的时间以及做其他事情。

Timer startRecordingTimer() => Timer(Duration(milliseconds: 10 * 1000), handleTimeout);

void handleTimeout() {
  //when startRecordingTimer() reaches 0, do the following
  stopRecording();
}

@override
  Widget build(BuildContext context) {
    return Scaffold(
        body: Align(
          alignment: Alignment.bottomLeft,
          child: Column(
            children: [
              Row(
                children: [
                  GestureDetector(
                    onTap: () async {
                      startRecording();
                    },
                    onLongPressDown: (details) {  
                      startRecordingTimer();
                      startRecording();
                    },
                    onLongPressUp: () {
                      //Need to measure how long user held down button
                      //Do other stuff using the aforementioned duration
                    },
                  ),
                ],
              ),
            ],
          ),
        )
    );
  }

Answer 1

在 onLongPressDown() 你可以得到 DateTime 然后得到结束 DateTime 从 onLongPressUp()

减去

DateTime startTime;
DateTime endTime;
onLongPressDown: (details) {  
    startTime = DateTime.now();
  },
onLongPressUp: () {
    endTime = DateTime.now();  
    longPressDuration = endTime.difference(startTime);
  },

Answer 2

使用 Stopwatch

在 class 中创建一个实例： Stopwatch stopwatch = Stopwatch();

 GestureDetector(
    onTap: () async {
       startRecording();
    },
    onLongPressDown: (details) {  
      startRecordingTimer();
      startRecording();
      stopwatch.start();
    },
    onLongPressUp: () {
      stopwatch.stop();
      var timeElapsedInSeconds =     stopwatch.elapsed.inSeconds;
      print("Time elapsed: $timeElapsedInSeconds");
    },
)

如何测量用户按下按钮的时间？

How do I measure how long the user held down a button?

time

button

dart

flutter