如何在flutter中的videoplayercontroller.asset中打印视频路径

问题描述

因此，我试图创建一个功能，当我们单击图标按钮时，它将更改视频路径。它将使用字符串更改视频路径。我正在使用print（“ $ videoname”）来确保字符串更改，并且确实如此。但是它仍然无法正常运行，使用videoplayercontroller.assets（）：

这是我试图制作的代码

    String videoname="Video/Intro.mp4";
              Container(
              child:Column(
                crossAxisAlignment: CrossAxisAlignment.start,children: [
                ChewieListItem(
    
                  videoPlayerController: VideoPlayerController.asset(videoname),looping: false,),Container(
                  margin: EdgeInsets.symmetric(vertical: 20.0),height: 100.0,child: ListView(
                    scrollDirection: Axis.horizontal,children: [
                      IconButton(
    
                        icon:Icon(Icons.people),onPressed: (){
                              videoname="Video/Intro.mp4";
                              print("$videoname");
                      },IconButton(
    
                        icon:Icon(Icons.personal_video),onPressed: (){
                          videoname="Video/Intro1.mp4";
                          print("$videoname");
                        },],)

解决方法

您可以在下面复制粘贴运行完整代码
步骤1：在key: UniqueKey()中使用ChewieListItem
步骤2：在setState中使用onPressed
代码段

ChewieListItem(
          key: UniqueKey(),videoPlayerController: VideoPlayerController.asset(videoname),looping: false,),IconButton(
    icon: Icon(Icons.people),onPressed: () {
      setState(() {
        videoname = "Video/Intro.mp4";
        print("$videoname");
      });
    },IconButton(
    icon: Icon(Icons.personal_video),onPressed: () {
      setState(() {
        videoname = "Video/Intro1.mp4";
        print("$videoname");
      });
    },

工作演示

完整代码

import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
import 'package:chewie/chewie.dart';

class ChewieListItem extends StatefulWidget {
  // This will contain the URL/asset path which we want to play
  final VideoPlayerController videoPlayerController;
  final bool looping;

  ChewieListItem({
    @required this.videoPlayerController,this.looping,Key key,}) : super(key: key);

  @override
  _ChewieListItemState createState() => _ChewieListItemState();
}

class _ChewieListItemState extends State<ChewieListItem> {
  ChewieController _chewieController;

  @override
  void initState() {
    super.initState();
    print("ChewieListItem initState");
    // Wrapper on top of the videoPlayerController
    _chewieController = ChewieController(
      videoPlayerController: widget.videoPlayerController,aspectRatio: 16 / 9,// Prepare the video to be played and display the first frame
      autoInitialize: true,looping: widget.looping,// Errors can occur for example when trying to play a video
      // from a non-existent URL
      errorBuilder: (context,errorMessage) {
        return Center(
          child: Text(
            errorMessage,style: TextStyle(color: Colors.white),);
      },);
  }

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.all(8.0),child: Chewie(
        controller: _chewieController,);
  }

  @override
  void dispose() {
    print("ChewieListItem dispose");
    super.dispose();
    // IMPORTANT to dispose of all the used resources
    widget.videoPlayerController.dispose();
    _chewieController.dispose();
  }
}

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: 'Flutter Demo Home Page'),);
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key,this.title}) : super(key: key);

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  String videoname = "Video/Intro.mp4";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),body: Container(
          child:
              Column(crossAxisAlignment: CrossAxisAlignment.start,children: [
        ChewieListItem(
          key: UniqueKey(),Container(
          margin: EdgeInsets.symmetric(vertical: 20.0),height: 100.0,child: ListView(
            scrollDirection: Axis.horizontal,children: [
              IconButton(
                icon: Icon(Icons.people),onPressed: () {
                  setState(() {
                    videoname = "Video/Intro.mp4";
                    print("$videoname");
                  });
                },IconButton(
                icon: Icon(Icons.personal_video),onPressed: () {
                  setState(() {
                    videoname = "Video/Intro1.mp4";
                    print("$videoname");
                  });
                },],])),);
  }
}

,

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setState