flutter - 如何在 dart/flutter 中收聽流值

任何人幫助追蹤音頻的位置(即)

if(durationtoOne(position==5)){ FlutterToast.Showtoast(msg:"I am At 5 sec"); }

如果在 initstate 中添加出現(xiàn)錯(cuò)誤，我會(huì)被困在何處添加此代碼，
我想通過音頻平臺(tái)收聽位置

代碼從這里開始

import 'dart:async';import 'package:assets_audio_player/assets_audio_player.dart';import 'package:flutter/material.dart';import 'package:fluttertoast/fluttertoast.dart';class SmartMantra extends StatefulWidget {@override_SmartMantraState createState() => _SmartMantraState(); }class _SmartMantraState extends State<SmartMantra> {StreamSubscription _positionSubscription;Duration position;AssetsAudioPlayer _assetsAudioPlayer;stream() {_positionSubscription = _assetsAudioPlayer.currentPosition.listen((p) => setState(() => position = p),);}@overridevoid initState() {_assetsAudioPlayer.open("assets/shivamantra.mp3");stream();_assetsAudioPlayer.finished.listen((finished) {print(finished); // print(count);});super.initState();}@overridevoid dispose() {_positionSubscription.cancel();super.dispose();}@overrideWidget build(BuildContext context) {return Scaffold(body: Column(children: <Widget>[SizedBox(height: 70,),Center(child: Text(durationToone(position).toString(),style: TextStyle(color: Colors.black, fontSize: 12),),),//getTextContainer()],));} int durationToone(Duration duration) {int twoDigits(int n) {if (n >= 10) return n;return n;}int twoDigitSeconds =twoDigits(duration.inSeconds.remainder(Duration.secondsPerMinute));return twoDigitSeconds; } }

代碼到此結(jié)束

總結(jié):在特定位置需要在位置變化時(shí)觸發(fā)一些函數(shù)(即)

if(durationtoOne(position==5)){ FlutterToast.Showtoast(msg:"I am At 5 sec"); }

通過音頻播放或應(yīng)用程序在前臺(tái)

最佳答案

如果流不是廣播流，則您只能收聽一次。

請(qǐng)參閱此 Medium post 以了解有關(guān) Streams 的更多信息。

收聽 stream 時(shí)，您需要在 _assetsAudioPlayer.currentPosition 函數(shù)中添加您的代碼。

import 'dart:async'; import 'package:assets_audio_player/assets_audio_player.dart'; import 'package:flutter/material.dart'; import 'package:fluttertoast/fluttertoast.dart';class SmartMantra extends StatefulWidget {@override_SmartMantraState createState() => _SmartMantraState(); }class _SmartMantraState extends State<SmartMantra> {StreamSubscription _positionSubscription;Duration position;AssetsAudioPlayer _assetsAudioPlayer;stream() {_positionSubscription = _assetsAudioPlayer.currentPosition.listen((p) {setState(() => position = p));// You should add your code hereif(durationtoOne(position==5)){FlutterToast.Showtoast(msg:"I am At 5 sec");}}}@overridevoid initState() {_assetsAudioPlayer.open("assets/shivamantra.mp3");stream();_assetsAudioPlayer.finished.listen((finished) {print(finished); // print(count);});super.initState();}@overridevoid dispose() {_positionSubscription.cancel();super.dispose();}@overrideWidget build(BuildContext context) {return Scaffold(body: Column(children: <Widget>[SizedBox(height: 70,),Center(child: Text(durationToone(position).toString(),style: TextStyle(color: Colors.black, fontSize: 12),),),//getTextContainer()],));}int durationToone(Duration duration) {int twoDigits(int n) {if (n >= 10) return n;return n;}int twoDigitSeconds =twoDigits(duration.inSeconds.remainder(Duration.secondsPerMinute));return twoDigitSeconds;} }

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