Flutter 颤振不在listview中显示视频
很抱歉在这里问了一个愚蠢的问题。 我是一个新手,我正在开发一个小的颤振应用程序,它可以获取json并在ListView中显示视频 但它是空白的,在应用程序中不显示任何视频Flutter 颤振不在listview中显示视频,flutter,dart,flutter-video-player,Flutter,Dart,Flutter Video Player,很抱歉在这里问了一个愚蠢的问题。 我是一个新手,我正在开发一个小的颤振应用程序,它可以获取json并在ListView中显示视频 但它是空白的,在应用程序中不显示任何视频 Future<Photo> fetchJson() async { var url = "https://api.tenor.com/v1/random?key=1FS646G91JAT&q=meme&media_filter=basic&limit=50"; v
Future<Photo> fetchJson() async {
var url = "https://api.tenor.com/v1/random?key=1FS646G91JAT&q=meme&media_filter=basic&limit=50";
var response = await http.get(url);
if (response.statusCode == 200) {
return photoFromJson(response.body);
} else {
throw Exception('Failed to fetch json');
}
}
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: MyHomePage(title: 'Multiple Videos Decode Test'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title, this.url}) : super(key: key);
final String title;
final String url;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
Future<Photo> futureJson;
String url;
VideoPlayerController _controller;
Future<void> _initializeVideoPlayerFuture;
@override
void initState() {
futureJson = fetchJson();
_controller = VideoPlayerController.network(widget.url);
_initializeVideoPlayerFuture = _controller.initialize();
_controller.setLooping(true);
super.initState();
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Container(
child: FutureBuilder<Photo>(
future: futureJson,
builder: (context, snapshot) {
if (snapshot.hasError) {
return Container(
child:Center(
child: Text("${snapshot.error}")
)
);
} else if(snapshot.hasData) {
return ListView.builder(
itemCount: snapshot.data.results.length,
itemBuilder: (context, index){
var url = snapshot.data.results[index].media[0].mp4.url;
return FutureBuilder(
future: _initializeVideoPlayerFuture,
builder: (context, snapshot2){
if(snapshot2.connectionState == ConnectionState.done){
return AspectRatio(
aspectRatio: _controller.value.aspectRatio,
child: VideoPlayer(_controller = VideoPlayerController.network(url),
),
);
} else {
return Center(
child: CircularProgressIndicator()
);
}
},
);
});}
return Center(
child: CircularProgressIndicator()
);
}
),
),
);
}
}
Future fetchJson()异步{
变量url=”https://api.tenor.com/v1/random?key=1FS646G91JAT&q=meme&media_filter=basic&limit=50";
var response=wait http.get(url);
如果(response.statusCode==200){
返回photoFromJson(response.body);
}否则{
抛出异常('未能获取json');
}
}
void main(){
runApp(MyApp());
}
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
视觉密度:视觉密度。自适应平台密度,
),
主页:MyHomePage(标题:“多个视频解码测试”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key-Key,this.title,this.url}):超级(Key:Key);
最后的字符串标题;
最终字符串url;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
未来;
字符串url;
视频播放控制器\u控制器;
未来(Future)初始设定未来玩家;;
@凌驾
void initState(){
futureJson=fetchJson();
_controller=VideoPlayerController.network(widget.url);
_initializeVideoPlayerFuture=_controller.initialize();
_控制器。设置循环(真);
super.initState();
}
@凌驾
无效处置(){
_controller.dispose();
super.dispose();
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
主体:容器(
孩子:未来建设者(
未来:未来,
生成器:(上下文,快照){
if(snapshot.hasError){
返回容器(
儿童:中心(
子项:文本(“${snapshot.error}”)
)
);
}else if(snapshot.hasData){
返回ListView.builder(
itemCount:snapshot.data.results.length,
itemBuilder:(上下文,索引){
var url=snapshot.data.results[index].media[0].mp4.url;
回归未来建设者(
未来:_initializevideoplayer未来,
生成器:(上下文,快照2){
如果(快照2.connectionState==connectionState.done){
返回AspectRatio(
aspectRatio:_controller.value.aspectRatio,
子项:VideoPlayer(_controller=VideoPlayerController.network(url),
),
);
}否则{
返回中心(
子对象:循环进程指示器()
);
}
},
);
});}
返回中心(
子对象:循环进程指示器()
);
}
),
),
);
}
}
没有错误,我想问题可能是
\u controller=VideoPlayerController.network(widget.url)代码>
但是,如何将url链接发送到视频播放器?
正在寻求帮助,谢谢