这是我的代码，正在其中播放视频。现在，我想在切换页面时停止（暂停）视频。有时代码可以正常工作，但有时会出现视频音频，但视频页面无法打开。我是初学者。我曾尝试在切换之前暂停视频，但是很遗憾，我的逻辑没有起作用。根据我的经验，这种情况是在缓冲视频时发生的，我切换了页面。
final feedViewModel = GetIt.instance<FeedViewModel>();
int currentIndex = -1;
class HomeScreen extends StatefulWidget {
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
int _pageController = 0;
List<Widget> _pages = [FeedScreen(), DiscoverPage(), InboxPage(), MePage()];
counter(int index) {
if (currentIndex >= 0) {
try {
if (feedViewModel.listVideos == null) {
final feed = _FeedScreenState();
if (index == 0) {
feed.load("For you");
}
} else {
feedViewModel.listVideos[currentIndex].controller.pause();
feedViewModel.listVideos = null;
feedViewModel.controller.dispose();
feedViewModel.controller=null;
super.dispose();
}
} catch (e) {
feedViewModel.listVideos = null;
final feed = _FeedScreenState();
if (index == 0) {
feed.load("For you");
}
}
}
_pageController = index;
}
@override
Widget build(BuildContext context) {
// Constants.pref.setBool("loggedIn", true);
return ResponsiveBuilder(
builder: (BuildContext context, SizingInformation sizingInformation) {
return Scaffold(
bottomNavigationBar: Container(
padding: EdgeInsets.symmetric(horizontal: 15),
color: Colors.black,
height: sizingInformation.localWidgetSize.height * 0.08,
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
InkWell(
onTap: () {
setState(() {
counter(0);
});
},
child: _navBarItem(
title: "Home",
icon: Icons.home,
),
),
InkWell(
onTap: () {
setState(() {
counter(1);
});
},
child: _navBarItem(
title: "Discover",
icon: Icons.search,
),
),
InkWell(
onTap: () async {
if (Constants.pref.getBool("loggedIn") == true) {
try {
if (currentIndex >= 0) {
try {
if (feedViewModel.listVideos != null) {
if (feedViewModel.listVideos[currentIndex]
.controller.value.isPlaying) {
feedViewModel
.listVideos[currentIndex].controller
.pause();
feedViewModel.listVideos = null;
feedViewModel.controller.dispose();
feedViewModel.controller=null;
super.dispose();
}
}
} catch (e) {}
}
} catch (e) {
print(e.toString());
}
final videoPath = await Navigator.of(context)
.pushNamed(CAMERA_SCREEN);
/* Navigator.push(
context,
MaterialPageRoute(
// builder: (_) => Video()
builder: (_) => HomeScreen2(null)
// builder: (_) => AddVideoPage()
));*/
} else {
toast("Please login/sign up");
}
},
child: Container(
margin: EdgeInsets.only(top: 10),
width: 50,
height: sizingInformation.localWidgetSize.height * 0.07,
child: Stack(
children: <Widget>[
Align(
alignment: Alignment.topLeft,
child: Container(
width: 20,
height: sizingInformation.localWidgetSize.height *
0.05,
decoration: BoxDecoration(
borderRadius:
BorderRadius.all(Radius.circular(10)),
color: Colors.blue),
),
),
Align(
alignment: Alignment.topRight,
child: Container(
width: 20,
height: sizingInformation.localWidgetSize.height *
0.05,
decoration: BoxDecoration(
borderRadius:
BorderRadius.all(Radius.circular(10)),
color: Colors.red),
),
),
Align(
alignment: Alignment.topCenter,
child: Container(
width: 40,
height: sizingInformation.localWidgetSize.height *
0.05,
decoration: BoxDecoration(
borderRadius:
BorderRadius.all(Radius.circular(10)),
color: Colors.white),
child: Icon(
Icons.add,
color: Colors.black,
),
),
)
],),),),
InkWell(
onTap: () {
setState(() {
counter(2);
});
},
child: _navBarItem(
title: "Notification",
icon: Icons.message,
),
),
InkWell(
onTap: () {
setState(() {
counter(3);
});
},
child: _navBarItem(
title: "Profile",
icon: Icons.person,
),
),
],
),
),
// body: Constants.pref.getBool("loggedIn") == true && _pageController==4
// ? _pages[_pageController]
// : ProfileApp());
body: _pages[_pageController]);
},
);
}
Widget _navBarItem({String title, IconData icon}) {
return Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[Icon(icon), Text(title)],
);
}
toast(String message) {
Fluttertoast.showToast(
msg: message,
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1);
}
}
class FeedScreen extends StatefulWidget {
// FeedScreen({Key key}) : super(key: key);
@override
_FeedScreenState createState() => _FeedScreenState();
}
class _FeedScreenState extends State<FeedScreen>with SingleTickerProviderStateMixin {
AnimationController _animationController;
int _followingForYouController = 1;
FullScreenDialog _myDialog;
@override
void initState() {
_animationController =
AnimationController(vsync: this, duration: Duration(seconds: 8));
_animationController.repeat();
load("For you");
super.initState();
}
Future<bool> _onWillPop() async {
if (currentIndex >= 0) {
if (feedViewModel.listVideos != null) {
feedViewModel.listVideos[currentIndex].controller.pause();
feedViewModel.listVideos = null;
feedViewModel.controller.dispose();
feedViewModel.controller=null;
super.dispose();
}
}
}
@override
Widget build(BuildContext context) {
return ViewModelBuilder<FeedViewModel>.reactive(
disposeViewModel: false,
builder: (context, model, child) => videoScreen(),
viewModelBuilder: () => feedViewModel);
}
Widget videoScreen() {
return WillPopScope(
onWillPop: _onWillPop,
child: ResponsiveBuilder(
builder: (BuildContext context, SizingInformation sizingInformation) {
return Padding(
padding: const EdgeInsets.all(1),
child: Scaffold(
backgroundColor: GetIt.instance<FeedViewModel>().actualScreen == 0
? Colors.black
: Colors.white,
body: Stack(
children: [
PageView.builder(
itemCount: 1,
onPageChanged: (value) {
print(value);
if (value == 1)
SystemChrome.setSystemUIOverlayStyle(
SystemUiOverlayStyle.dark);
else
SystemChrome.setSystemUIOverlayStyle(
SystemUiOverlayStyle.light);
},
itemBuilder: (context, index) {
return scrollFeed(sizingInformation);
})
],
),
));
}),
);
}
Widget scrollFeed(SizingInformation sizingInformation) {
return Column(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Expanded(child: feedVideos(sizingInformation)),
],
);
}
Widget feedVideos(SizingInformation sizingInformation) {
return feedViewModel.listVideos != null
? Scaffold(body: videoPage(sizingInformation))
: Center(child: CircularProgressIndicator());
}
Widget videoPage(SizingInformation sizingInformation) {
return Stack(
children: [
PageView.builder(
controller: PageController(
initialPage: 0,
viewportFraction: 1,
),
itemCount: feedViewModel.listVideos.length,
onPageChanged: (index) {
index = index % (feedViewModel.listVideos.length);
feedViewModel.changeVideo(index);
},
scrollDirection: Axis.vertical,
itemBuilder: (context, index) {
currentIndex = index;
index = index % (feedViewModel.listVideos.length);
return videoCard(
feedViewModel.listVideos[index], index, sizingInformation);
},
),
followingForYou(),
],
);
}
Widget videoCard(
Video video, int index, SizingInformation sizingInformation) {
return Stack(
children: [
video.controller != null
? GestureDetector(
onTap: () {
if (video.controller.value.isPlaying) {
video.controller.pause();
} else {
video.controller.play();
}
},
child: SizedBox.expand(
child: FittedBox(
fit: BoxFit.cover,
child: SizedBox(
width: video.controller.value.size?.width ?? 0,
height: video.controller.value.size?.height ?? 0,
child: VideoPlayer(video.controller),
),
)),
)
: Container(
color: Colors.black,
child: Center(
child: Text("Loading..."),
),
),
Column(
mainAxisAlignment: MainAxisAlignment.end,
children: <Widget>[
Row(
mainAxisSize: MainAxisSize.max,
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
VideoDescription(
video.id, video.user, video.videoTitle, video.songName),
_rightWidget(video, index),
// _rightSideButtonsWidgets(index),
// _textDataWidgetBottom(sizingInformation, index)
],
),
SizedBox(height: 20)
],
),
],
);
}
@override
void dispose() {
try {
feedViewModel.controller.dispose();
feedViewModel.controller=null;
super.dispose();
} catch (e) {
print(e.toString());
}
}
load(String type) async {
feedViewModel.listVideos = await getVideoList(type);
setState(() {
feedViewModel.loadVideo(0);
// feedViewModel.loadVideo(1);
});
}
Future<List<Video>> getVideoList(String type) async {
var videoList = <Video>[];
final body = {
"username": Constants.pref.getString("profileId"),
"Type": type,
};
var jsonObj = json.encode(body);
var response = await http.post('https://ssca-api.appspot.com/act/video/',
headers: {"api-Key": "NkHb13BxRBiZ0JSyxLbAU"}, body: jsonObj);
print("${response.request}"); //200 if successful
print("http status: ${response.statusCode}"); //200 if successful
print("http Request: ${jsonObj}"); //200 if successful
print("http Response: ${response.body}");
var data = json.decode(response.body);
// data = jsonDecode(response.body);
for (int i = 0; i < data["video"].length; i++) {
Video video = new Video();
video.id = data["video"][i]["id"];
video.user = data["video"][i]["profileId"];
video.userPic = data["video"][i]["image"];
video.videoTitle = data["video"][i]["description"];
video.songName = "Music name is here";
video.likes = data["video"][i]["liked"];
video.comments = data["video"][i]["comment"];
video.url = data["video"][data["video"].length-1]["video"];
// video.url = data["video"][i]["video"];
video.isLiked = data["video"][i]["isLiked"];
if (data["video"][i]["followstatus"] == 0) {
video.following = false;
} else {
video.following = true;
}
video.isLiked = data["video"][i]["isLiked"];
videoList.add(video);
}
return videoList;
}
toast(String message) {
Fluttertoast.showToast(
msg: message,
toastLength: Toast.LENGTH_SHORT,
gravity: ToastGravity.CENTER,
timeInSecForIosWeb: 1);
}
// Full dimensions of an action
static const double ActionWidgetSize = 60.0;
// The size of the icon showen for Social Actions
static const double ActionIconSize = 35.0;
// The size of the share social icon
static const double ShareActionIconSize = 25.0;
// The size of the profile image in the follow Action
static const double ProfileImageSize = 50.0;
// The size of the plus icon under the profile image in follow action
static const double PlusIconSize = 20.0;
LinearGradient get musicGradient => LinearGradient(colors: [
Colors.grey[800],
Colors.grey[900],
Colors.grey[900],
Colors.grey[800]
], stops: [
0.0,
0.4,
0.6,
1.0
], begin: Alignment.bottomLeft, end: Alignment.topRight);
Widget _rightWidget(Video video, int index) {
return Container(
width: 100.0,
child: Column(mainAxisSize: MainAxisSize.min, children: [
_getFollowAction(index),
_likeWidget(index),
GestureDetector(
onTap: () {
if (Constants.pref.getBool("loggedIn") == true) {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) =>
CommentList(feedViewModel.listVideos[index].id)));
} else {
toast("Please login/sign up");
}
},
child: Container(
margin: EdgeInsets.only(top: 15.0),
width: 60.0,
height: 60.0,
child: Column(children: [
Icon(FontAwesomeIcons.comment,
size: 35.0, color: Colors.grey[300]),
Padding(
padding: EdgeInsets.only(top: 8.0),
child: Text(video.comments,
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w500,
fontSize: 12.0)),
)
])),
),
GestureDetector(
onTap: () {
// _shareImageAndText(video);
Share.share('check out my video ' + video.url);
},
child: Container(
margin: EdgeInsets.only(top: 15.0),
width: 60.0,
height: 60.0,
child: Column(children: [
Icon(FontAwesomeIcons.share,
size: 25.0, color: Colors.grey[300]),
Padding(
padding: EdgeInsets.only(top: 8.0),
child: Text('Share',
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w500,
fontSize: 12.0)),
)
])),
),
GestureDetector(
onTap: () {
Navigator.push(
context,
new MaterialPageRoute(
builder: (BuildContext context) => _myDialog =
new FullScreenDialog(feedViewModel.listVideos[index].id),
fullscreenDialog: true,
));
},
child: Container(
margin: EdgeInsets.only(top: 15.0),
width: 60.0,
height: 60.0,
child: Column(children: [
Icon(FontAwesomeIcons.angry,
size: 25.0, color: Colors.grey[300]),
Padding(
padding: EdgeInsets.only(top: 8.0),
child: Text('Report',
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w500,
fontSize: 12.0)),
)
])),
),
CircleImageAnimation(
child: _getMusicPlayerAction(video.userPic),
)
]),
);
}
Widget _likeWidget(int index) {
return GestureDetector(
onTap: () {
if (Constants.pref.getBool("loggedIn") == true) {
setState(() {
if (feedViewModel.listVideos[index].isLiked) {
feedViewModel.listVideos[index].isLiked = false;
} else {
feedViewModel.listVideos[index].isLiked = true;
}
final body = {
"username": Constants.pref.getString("profileId"),
"videoId": feedViewModel.listVideos[index].id,
"like": feedViewModel.listVideos[index].isLiked,
};
ApiService.like(body).then((success) {
if (success.statusCode == 200) {
var response = json.decode(success.body);
if (response["response"]["confirmation"] != 0) {
feedViewModel.listVideos[index].likes =
response["response"]["TotalLiked"];
} else {
ShowAlertDialog(context, response["success"]["message"]);
}
} else {
ShowAlertDialog(context, ParameterConstant.STATUS);
}
});
});
} else {
toast("Please login/sign up");
}
},
child: Container(
margin: EdgeInsets.only(top: 15.0),
width: 60.0,
height: 60.0,
child: Column(children: [
Icon(
FontAwesomeIcons.solidHeart,
size: 35.0,
color:
feedViewModel.listVideos[index].isLiked ? Colors.red : null,
),
Padding(
padding: EdgeInsets.only(top: 8.0),
child: Text(feedViewModel.listVideos[index].likes,
style: TextStyle(
color: Colors.white,
fontWeight: FontWeight.w500,
fontSize: 12.0)),
)
])),
);
}
Widget _getFollowAction(int index) {
return GestureDetector(
onTap: () {
if (Constants.pref.getBool("loggedIn") == true) {
setState(() {
if (feedViewModel.listVideos[index].following) {
feedViewModel.listVideos[index].following = false;
} else {
feedViewModel.listVideos[index].following = true;
}
final body = {
"profileId": Constants.pref.getString("profileId"),
"followupId": feedViewModel.listVideos[index].user,
};
ApiService.follow(body).then((success) {
if (success.statusCode == 200) {
var response = json.decode(success.body);
// if (response["confirmation"] != 0) {
/* if (feedViewModel.listVideos[index].following) {
feedViewModel.listVideos[index].following = false;
} else {
feedViewModel.listVideos[index].following = true;
}*/
// } else {
// ShowAlertDialog(context, response["message"]);
// }
} else {
ShowAlertDialog(context, ParameterConstant.STATUS);
}
});
});
} else {
toast("Please login/sign up");
}
},
child: Container(
margin: EdgeInsets.symmetric(vertical: 10.0),
width: 60.0,
height: 60.0,
child: Stack(children: [
_getProfilePicture(feedViewModel.listVideos[index].userPic),
_getPlusIcon(index)
])),
);
}
Widget _getProfilePicture(userPic) {
return Positioned(
left: (ActionWidgetSize / 2) - (ProfileImageSize / 2),
child: Container(
padding: EdgeInsets.all(1.0),
// Add 1.0 point padding to create border
height: ProfileImageSize,
// ProfileImageSize = 50.0;
width: ProfileImageSize,
// ProfileImageSize = 50.0;
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(ProfileImageSize / 2)),
// import 'package:cached_network_image/cached_network_image.dart'; at the top to use CachedNetworkImage
child: ClipRRect(
borderRadius: BorderRadius.circular(10000.0),
child: CachedNetworkImage(
imageUrl: userPic,
placeholder: (context, url) =>
new CircularProgressIndicator(),
errorWidget: (context, url, error) => new Icon(Icons.error),
))));
}
Widget _getPlusIcon(int index) {
return Positioned(
bottom: 0,
left: ((ActionWidgetSize / 2) - (PlusIconSize / 2)),
child: Container(
width: PlusIconSize, // PlusIconSize = 20.0;
height: PlusIconSize, // PlusIconSize = 20.0;
decoration: BoxDecoration(
color: Color.fromARGB(255, 255, 43, 84),
borderRadius: BorderRadius.circular(15.0)),
child: Icon(
feedViewModel.listVideos[index].following
? Icons.remove
: Icons.add,
color: Colors.white,
size: 20.0,
)),
);
// import_contacts, clear,forward,gesture
}
Widget _getMusicPlayerAction(userPic) {
return Container(
margin: EdgeInsets.only(top: 10.0),
width: ActionWidgetSize,
height: ActionWidgetSize,
child: Column(children: [
Container(
padding: EdgeInsets.all(11.0),
height: ProfileImageSize,
width: ProfileImageSize,
decoration: BoxDecoration(
gradient: musicGradient,
borderRadius: BorderRadius.circular(ProfileImageSize / 2)),
child: ClipRRect(
borderRadius: BorderRadius.circular(10000.0),
child: CachedNetworkImage(
imageUrl: userPic,
placeholder: (context, url) =>
new CircularProgressIndicator(),
errorWidget: (context, url, error) => new Icon(Icons.error),
))),
]));
}
TextStyle _textStyleFollowingForYou(Color color) {
return TextStyle(fontSize: 18, color: color, fontWeight: FontWeight.w500);
}
Widget followingForYou() {
return SafeArea(
child: Container(
padding: EdgeInsets.only(top: 20),
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
crossAxisAlignment: CrossAxisAlignment.center,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
GestureDetector(
onTap: () {
setState(() {
if (Constants.pref.getBool("loggedIn") == true) {
_followingForYouController = 0;
setState(() {
feedViewModel.listVideos[currentIndex].controller
.pause();
feedViewModel.listVideos = null;
load("Following");
});
} else {
toast("Please login/sign up");
}
});
},
child: Text("Following",
style: _textStyleFollowingForYou(
_followingForYouController == 0
? Colors.white
: Colors.white60))),
SizedBox(
width: 15,
),
GestureDetector(
onTap: () {
setState(() {
try {
feedViewModel.listVideos[currentIndex].controller
.pause();
} catch (e) {
print(e.toString());
}
_followingForYouController = 1;
feedViewModel.listVideos = null;
load("For you");
});
},
child: Text("For you",
style: _textStyleFollowingForYou(
_followingForYouController == 1
? Colors.white
: Colors.white60)))
],
),
]),
),
);
}
}