Flutter Just Audio播放事件 [英] Flutter Just Audio playbackEvent

问题描述

我在Flutter应用中使用了名为 Just Audio 的程序包.它提供了一个playBackEvent:playbackEvent.currentPosition，它显示了音频文件中已播放的时间位置.但是，我对Dart还是陌生的，并且不太了解如何为该事件订阅侦听器，以便我可以使用更改的值来做一些事情.

I am using a package called Just Audio in my Flutter app. It provides an playBackEvent: playbackEvent.currentPosition which shows the time position that has been played in the Audio file. However I'm a little new to Dart and don't really understand how to subscribe a listener to this event so that I can do something with the changing values.

我想做的是运行一个函数，该函数在值更改时设置状态，以便我可以显示进度并让用户知道他们当时在音频文件中的距离.

What I want to do is run a function which sets state when the value changes so I can show the progress and let the users know how far through the Audio file they are at that moment.

有人可以向我解释我该怎么做吗?

Can someone please explain to me how I should do this?

任何帮助将不胜感激.

推荐答案

完整的示例可用此处.

 StreamBuilder<Duration>(
            stream: _player.durationStream,
            builder: (context, snapshot) {
              final duration = snapshot.data ?? Duration.zero;
              return StreamBuilder<Duration>(
                stream: _player.getPositionStream(),
                builder: (context, snapshot) {
                  var position = snapshot.data ?? Duration.zero;
                  if (position > duration) {
                    position = duration;
                  }
                  return SeekBar(
                    duration: duration,
                    position: position,
                    onChangeEnd: (newPosition) {
                      _player.seek(newPosition);
                    },
                  );
                },
              );
            },
          ),

这篇关于Flutter Just Audio播放事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！