problems with video player flutter - flutter

Question

I'm new in Flutter and try to load video from api, but video player is not working correctly. I have PageView in my Widget _buildFilmsMainPages() and each Page will get own video from api.
i'm getting error while data is loading: The following NoSuchMethodError was thrown building FutureBuilder>(dirty, state: _FutureBuilderState>#033d3):
The method '[]' was called on null.
Receiver: null
Tried calling:
After loading this error is gone.
when i tap on play (Floating Action Button) i see only first frame of video but sound is working.
when i tap on stop (Floating Action Button) first frame of video is gone but sound is still working.
class HomePage extends StatefulWidget {
HomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_ HomePageState createState() => _HomePageState();
}
class _HomePageState extends State<HomePage> {
VideoPlayerController _controller;
Future<void> _initializeVideoPlayerFuture;
bool isVideo = false;
int filmIndex = 0;
#override
void initState() {
super.initState();
}
#override
Widget build(BuildContext context) {
return Scaffold (
body: SingleChildScrollView(
child: _buildFilmsMainPages(),
)
);
}
Widget _buildFilmsMainPages() =>
FutureBuilder(
future:getMoviesListByDay(date))),
builder: (BuildContext context, AsyncSnapshot snapshot) {
without this code i get error, but player isn't working
correctly anyway and i'm getting error while data is loading
_controller= VideoPlayerController.network
(snapshot.data[filmIndex].media!=null?
snapshot.data[filmIndex].media.elementAt(1)
:"https://flutter.github.io/assets-for-api-
docs/assets/videos/butterfly.mp4");
_initializeVideoPlayerFuture =_controller.initialize();
_controller.setLooping(true);
if (snapshot.data != null) {
return
Column(
children:<Widget> [
SizedBox(
height: 460.0,
child: PageView.builder(
pageSnapping: true,
itemCount: snapshot.data.length,
onPageChanged: (int index) {
setState(() {
filmIndex = index;
i thought i should write this code here
_controller = VideoPlayerController.network
(snapshot.data[filmIndex].media!=null?
snapshot.data[filmIndex].media.elementAt(1)
:"https://flutter.github.io/assets-for-api-
docs/assets/videos/butterfly.mp4");
_initializeVideoPlayerFuture =
_controller.initialize();
_controller.setLooping(true);
});
},
itemBuilder: (context, index) {
return Column(
children: <Widget>[
Container(margin: const
EdgeInsets.symmetric(horizontal: 16.0),
child: ClipRRect(
borderRadius: BorderRadius.circular(8.0),
child: Container(
height: 250.0,
child: Stack(children: <Widget>[
Container(
child: GestureDetector(
child: isVideo ?
FutureBuilder(
future:_initializeVideoPlayerFuture,
builder: (context, snapshot) {
if (snapshot.connectionState ==
ConnectionState.done) {
return AspectRatio(
aspectRatio: 16.0 / 12.0,
child:VideoPlayer(_controller),
);
} else {
return Center(
child:
CircularProgressIndicator());
}
},
) :
FadeInImage.assetNetwork(
placeholder:
"assets/placeholder.jpg",
image:
snapshot.data[index].media!=null
? snapshot.data[index].media.elementAt(0): "",
fit: BoxFit.fill,
fadeInDuration:Duration(milliseconds: 50),
),
onTap: () =>
)
),
)
)
),
Row(children: <Widget>[
Container(
margin: const EdgeInsets.only(left: 16.0,
right: 16.0, top: 190.0),
height: 40.0,
width: 40.0,
child: FittedBox(
child: FloatingActionButton(
backgroundColor: Colors.white,
foregroundColor: Colors.black,
onPressed: () {
setState(() {
isVideo = !isVideo;
if (_controller.value.isPlaying) {
_controller.pause();
} else {
_controller.play();
}
});
},
child: Icon(_controller.value.isPlaying
? Icons.pause : LineIcons.play,
size: 30.0,)
),
)
);