要在Flutter中播放视频，必须在init（）方法中实例化其Url。 那么，如何从Firestore获取视频网址列表？ 如果我以Future的形式从Firestore中检索Url，则视频播放器将不接受它，因为它仅接受String而不接受Future对象。
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
import 'package:chewie/chewie.dart';
class VideoScreen extends StatefulWidget {
VideoScreen({this.studentName});
final String studentName;
@override
_VideoScreenState createState() => _VideoScreenState();
}
class _VideoScreenState extends State<VideoScreen> {
VideoPlayerController videoPlayerController;
@override
void initState() {
videoPlayerController = VideoPlayerController.network('${getU()}');
super.initState();
}
@override
Widget build(BuildContext context) {
final chewieController = ChewieController(
videoPlayerController: videoPlayerController,
aspectRatio: 3 / 2,
autoPlay: true,
looping: true,
);
final playerWidget = Chewie(
controller: chewieController,
);
return playerWidget;
}
Future<String> getU() async {
var document = await Firestore.instance.collection('Students')
.document('Badri');
var url = document.get().then((documents) {
print('video url: ${documents['video']}');
return documents['video'];
}
);
return url;
}
}
错误来了-
W/ykiddypijourna(28557): Accessing hidden method Landroid/media/AudioTrack;->getLatency()I (light greylist, reflection)
I/ExoPlayerImpl(28557): Init 77e7389 [ExoPlayerLib/2.9.6] [beryllium, POCO F1, Xiaomi, 28]
E/ExoPlayerImplInternal(28557): Source error.
E/ExoPlayerImplInternal(28557): com.google.android.exoplayer2.upstream.HttpDataSource$HttpDataSourceException: Unable to connect to Instance of 'Future<String>'
E/ExoPlayerImplInternal(28557): at com.google.android.exoplayer2.upstream.DefaultHttpDataSource.open(DefaultHttpDataSource.java:281)
E/ExoPlayerImplInternal(28557): at com.google.android.exoplayer2.upstream.StatsDataSource.open(StatsDataSource.java:83)
E/ExoPlayerImplInternal(28557): at com.google.android.exoplayer2.source.ExtractorMediaPeriod$ExtractingLoadable.load(ExtractorMediaPeriod.java:885)
E/ExoPlayerImplInternal(28557): at com.google.android.exoplayer2.upstream.Loader$LoadTask.run(Loader.java:381)
E/ExoPlayerImplInternal(28557): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/ExoPlayerImplInternal(28557): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/ExoPlayerImplInternal(28557): at java.lang.Thread.run(Thread.java:764)
E/ExoPlayerImplInternal(28557): Caused by: java.net.MalformedURLException: no protocol: Instance of 'Future<String>'
E/ExoPlayerImplInternal(28557): at java.net.URL.<init>(URL.java:601)
E/ExoPlayerImplInternal(28557): at java.net.URL.<init>(URL.java:498)
E/ExoPlayerImplInternal(28557): at java.net.URL.<init>(URL.java:447)
E/ExoPlayerImplInternal(28557): at com.google.android.exoplayer2.upstream.DefaultHttpDataSource.makeConnection(DefaultHttpDataSource.java:426)
E/ExoPlayerImplInternal(28557): at com.google.android.exoplayer2.upstream.DefaultHttpDataSource.open(DefaultHttpDataSource.java:279)
E/ExoPlayerImplInternal(28557): ... 6 more
答案 0 :(得分：0)
您写 freq1 freq2 ma phd
0 1 8 a a
1 2 9 b b
的方式对我来说有点奇怪。你可以试试吗？
getU更改：
Future<String> getU() async {
var docRef = Firestore.instance.collection('Students').document('Badri');
var doc = await docRef.get();
return doc['video'];
}
创建对文档的引用。这是一个同步操作，因为那里尚未读取任何数据。await的呼叫中使用await来解开get()。答案 1 :(得分：0)
回答您的问题可能为时已晚，但是有一个非常简单的解决方案。我为即将到来的网站制作了这样的页面，其中存储了许多视频。我在这里更改了代码，使其可以使用视频播放器而不是iFrame，并且删除了很多无用的东西，例如appBar和抽屉
import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:xspectre/Community.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:xspectre/Squad.dart';
import 'package:xspectre/T&C.dart';
import 'AddVideos.dart';
import 'Home.dart';
import 'JoinUs.dart';
import 'Profile.dart';
import 'help/IsPhone.dart';
class VideoPage extends StatefulWidget {
@override
_VideoPageState createState() => _VideoPageState();
}
List<Widget> WidgetList = [Center(child:CircularProgressIndicator(),)];
class _VideoPageState extends State<VideoPage> {
String creator ='';
String videos = '';
String game = '';
final _scrollController = ScrollController();
@override
void initState(){
super.initState();
makeWidgetList();
}
@override
Widget build(BuildContext context) {
return Container(
child: Scrollbar(
controller: _scrollController,
isAlwaysShown: true,
child: SingleChildScrollView(
controller: _scrollController,
child: Column(
children: WidgetList
),
),
),
);
}
void makeWidgetList() async{
Firestore.instance.collection("Videos").getDocuments().then((querySnapshot){
WidgetList = [];
List<Widget> RowWidgetList = [];
int count = 1;
var result;
for (result in querySnapshot.documents) {
if(true) {
if (isLaptop(context)) {
WidgetList.add(SizedBox(height: 20));
RowWidgetList.add(
Container(
height: 200,
width: MediaQuery
.of(context)
.size
.width * 0.3,
child: videoBox(result['Link'])
),
);
if (count < 3) {
count += 1;
}
else {
WidgetList.add(Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: RowWidgetList,
));
WidgetList.add(SizedBox(height: 25.0,));
RowWidgetList = [];
count = 1;
setState(() {});
}
}
else{
WidgetList.add(
Container(
height: 200,
width: MediaQuery
.of(context)
.size
.width * 0.96,
child: videoBox(result['Link'])
),
);
WidgetList.add(
SizedBox(height:20)
);
}
}
}
setState(() {
});
});
}
}
class videoBox extends StatefulWidget {
String Video;
videoBox(this.Video);
@override
_videoBoxState createState() => _videoBoxState(Video);
}
class _videoBoxState extends State<videoBox> {
String Video;
VideoPlayerController videoPlayerController;
ChewieController chewieController;
_videoBoxState(this.Video);
Video
@override
void initState(){
super.initState();
videoPlayerController = VideoPlayerController.network(Video);
final chewieController = ChewieController(
videoPlayerController: videoPlayerController,
aspectRatio: 3 / 2,
autoPlay: true,
looping: true,
autoInitialize:true
);
}
@override
Widget build(BuildContext context) {
return Container(
child: Chewie(
controller:chewieController,
),
) ;
}
}
String type1 = '';
String platform = '';
@FrankVanPuffelen犯的错误是他使用getU函数返回了将来的字符串，这当然会引起问题。我们需要使用另一种明智的策略。您可以使用它来创建它。您可以在https://xspectre-9a3b3.web.app/#/上查看我的版本，然后转到视频。我还没有发布完整的代码，但是给出了您需要的