Flutter disposing a video and using it again - flutter

Question

I want to cycle through a list of media files (images, videos, etc..) so I have a Future that calls itself to go over the list and show each media item.
I want it to be able to play videos one after another if my list contains for example [video, video, image, video], but if I use the following way:
void playVideo(File video) {
if(playerController != null && playerController.value.initialized) {
playerController.removeListener(listener);
playerController.dispose();
}
playerController = new VideoPlayerController.file(video);
playerController.initialize().then((_) => setState(() {}));
//playerController.setVolume(0.0);
playerController.play();
playerController.addListener(listener);
}
and calling playVideo each time I have a new video to display.
If I do that, I get the following error:
A VideoPlayerController was used after being disposed.
Once you have called dispose() on a VideoPlayerController, it can no longer be used.

Answer 1

Below code play again button click video change and dispose
class MainScreen extends StatefulWidget {
MainScreen({Key key}) : super(key: key);
#override
_MainScreenState createState() => new _MainScreenState();
}
class _MainScreenState extends State<MainScreen> {
List<String> urlsVideo = [
"assets/videos/1.1.mp4",
"assets/videos/1.2.mp4",
];
int videoPos = 1;
VideoPlayerController controllerFirst;
StreamController<bool> streamController = new StreamController();
#override
void initState() {
_startVideoPlayer();
super.initState();
}
#override
Widget build(BuildContext context) {
return new Scaffold(
backgroundColor: Colors.white,
body: Column(
children: <Widget>[
Expanded(
child: StreamBuilder(
stream: streamController.stream,
builder: (context, snapshot) {
if (snapshot.hasData &&
!snapshot.data &&
controllerFirst != null) {
return VideoPlayer(controllerFirst);
} else {
return Center(child: CircularProgressIndicator());
}
})),
RaisedButton(
child: Padding(
padding: const EdgeInsets.all(10.0),
child: Text("Play Again"),
),
onPressed: () {
_startVideoPlayer();
},
)
],
),
);
}
Future<void> _startVideoPlayer() async {
videoPos = videoPos == 0 ? 1 : 0;
streamController.add(true);
final VideoPlayerController _controller =
VideoPlayerController.asset(urlsVideo[videoPos]);
_controller.addListener(_listener);
await _controller.setLooping(true);
await _controller.initialize();
final VideoPlayerController oldController = controllerFirst;
if (mounted) {
setState(() {
controllerFirst = _controller;
});
}
await _controller.play();
await oldController?.dispose();
streamController.add(false);
}
get _listener => () {
if (controllerFirst != null && controllerFirst.value.size != null) {
if (mounted) setState(() {});
controllerFirst.removeListener(_listener);
}
};
}