[英]Flutter video_player plugin - VideoPlayerController.seekTo
I'm new to flutter and I'm using flutter video_player plugin to play videos.我是 flutter 的新手,我正在使用 flutter video_player 插件播放视频。 After I capture a video file (using camera plugin), I'd like to start video playback 1 second into the video (essentially to skip the first second).
捕获视频文件(使用相机插件)后,我想在视频的 1 秒内开始播放视频(基本上是跳过第一秒)。 I tried using.seekTo and passed it a Duration but it returned the following error:
我尝试了 using.seekTo 并传递了一个 Duration 但它返回了以下错误:
[VERBOSE-2:ui_dart_state.cc(148)] Unhandled Exception: NoSuchMethodError: The getter '_duration' was called on null.
Receiver: null
Tried calling: _duration
The API reference seemed straightforward enough but it's not like Duration. API 参考似乎很简单,但它不像 Duration。 Here's my code and thanks in advance!
这是我的代码,提前致谢!
Future<void> _startVideoPlayer() async {
videoPlayerController = VideoPlayerController.file(File(videoPath));
videoPlayerController.setVolume(1.0);
videoPlayerController.setLooping(true);
videoPlayerController.seekTo(Duration(seconds: 1));
await videoPlayerController.initialize();
await videoPlayerController.play();
}
You need to initialize first then do seekTo and play您需要先初始化,然后执行 seekTo 并播放
code snippet代码片段
_videoPlayerController1..initialize().then((_){
setState(() {
_videoPlayerController1.seekTo(Duration(seconds: 3));
_videoPlayerController1.play();
});
});
demo skip 3 seconds演示跳过 3 秒
full code完整代码
import 'package:chewie/chewie.dart';
import 'package:chewie/src/chewie_player.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
void main() {
runApp(
MyApp(),
);
}
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: ChewieDemo(title: 'Flutter Demo Home Page'),
);
}
}
class ChewieDemo extends StatefulWidget {
ChewieDemo({this.title = 'Chewie Demo'});
final String title;
@override
State<StatefulWidget> createState() {
return _ChewieDemoState();
}
}
class _ChewieDemoState extends State<ChewieDemo> {
TargetPlatform _platform;
VideoPlayerController _videoPlayerController1;
VideoPlayerController _videoPlayerController2;
ChewieController _chewieController;
@override
void initState() {
super.initState();
_videoPlayerController1 = VideoPlayerController.network(
'https://flutter.github.io/assets-for-api-docs/assets/videos/butterfly.mp4');
_videoPlayerController2 = VideoPlayerController.asset(
'assets/videos/sample.mp4');
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController1,
aspectRatio: 3 / 2,
autoPlay: false,
looping: true,
// Try playing around with some of these other options:
// showControls: false,
// materialProgressColors: ChewieProgressColors(
// playedColor: Colors.red,
// handleColor: Colors.blue,
// backgroundColor: Colors.grey,
// bufferedColor: Colors.lightGreen,
// ),
// placeholder: Container(
// color: Colors.grey,
// ),
// autoInitialize: true,
);
}
@override
void dispose() {
_videoPlayerController1.dispose();
_videoPlayerController2.dispose();
_chewieController.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
title: widget.title,
theme: ThemeData.light().copyWith(
platform: _platform ?? Theme.of(context).platform,
),
home: Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Column(
children: <Widget>[
Expanded(
child: Center(
child: Chewie(
controller: _chewieController,
),
),
),
FlatButton(
onPressed: () {
_chewieController.enterFullScreen();
},
child: Text('Fullscreen'),
),
Row(
children: <Widget>[
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_chewieController.dispose();
/*_videoPlayerController2.pause();
_videoPlayerController2.seekTo(Duration(seconds: 0));*/
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController1,
aspectRatio: 3 / 2,
autoPlay: false,
looping: true,
);
_videoPlayerController1..initialize().then((_){
setState(() {
_videoPlayerController1.seekTo(Duration(seconds: 3));
_videoPlayerController1.play();
});
});
});
},
child: Padding(
child: Text("Seek To"),
padding: EdgeInsets.symmetric(vertical: 16.0),
),
),
),
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_chewieController.dispose();
_videoPlayerController2.pause();
_videoPlayerController2.seekTo(Duration(seconds: 0));
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController1,
aspectRatio: 3 / 2,
autoPlay: true,
looping: true,
);
});
},
child: Padding(
child: Text("Video 1"),
padding: EdgeInsets.symmetric(vertical: 16.0),
),
),
),
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_chewieController.dispose();
_videoPlayerController1.pause();
_videoPlayerController1.seekTo(Duration(seconds: 0));
_chewieController = ChewieController(
videoPlayerController: _videoPlayerController2,
aspectRatio: 3 / 2,
autoPlay: true,
looping: true,
);
});
},
child: Padding(
padding: EdgeInsets.symmetric(vertical: 16.0),
child: Text("Video 2"),
),
),
)
],
),
Row(
children: <Widget>[
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_platform = TargetPlatform.android;
});
},
child: Padding(
child: Text("Android controls"),
padding: EdgeInsets.symmetric(vertical: 16.0),
),
),
),
Expanded(
child: FlatButton(
onPressed: () {
setState(() {
_platform = TargetPlatform.iOS;
});
},
child: Padding(
padding: EdgeInsets.symmetric(vertical: 16.0),
child: Text("iOS controls"),
),
),
)
],
)
],
),
),
);
}
}
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