flutter - 如何在 dart/flutter 中收听流值
任何人帮助追踪音频的位置(即)
if(durationtoOne(position==5)){ FlutterToast.Showtoast(msg:"I am At 5 sec"); }
如果在 initstate 中添加出现错误，我会被困在何处添加此代码，
我想通过音频平台收听位置
代码从这里开始
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),); } @override void initState() { _assetsAudioPlayer.open("assets/shivamantra.mp3"); stream(); _assetsAudioPlayer.finished.listen((finished) { print(finished); // print(count); }); super.initState(); } @override void dispose() { _positionSubscription.cancel(); super.dispose(); } @override Widget 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; } }
代码到此结束
总结:在特定位置需要在位置变化时触发一些函数(即)
if(durationtoOne(position==5)){ FlutterToast.Showtoast(msg:"I am At 5 sec"); }
通过音频播放或应用程序在前台
最佳答案
如果流不是广播流，则您只能收听一次。
请参阅此 Medium post 以了解有关 Streams 的更多信息。
收听 stream 时，您需要在 _assetsAudioPlayer.currentPosition 函数中添加您的代码。
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 here if(durationtoOne(position==5)){ FlutterToast.Showtoast(msg:"I am At 5 sec"); } } } @override void initState() { _assetsAudioPlayer.open("assets/shivamantra.mp3"); stream(); _assetsAudioPlayer.finished.listen((finished) { print(finished); // print(count); }); super.initState(); } @override void dispose() { _positionSubscription.cancel(); super.dispose(); } @override Widget 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; } }
