Field 'chewieController' has not been initialized-CodePudding

im try some code to get video from database mysql with flutter. but i have problem with the 'chewiecontroller' has not been initialized i had try to change the late variable with 'ChewieController? chewieController' but still error. any solution for that problem?
This is my current code:

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

class PlayVideoChewie extends StatefulWidget {
  final String url;
  const PlayVideoChewie({required this.url});

  @override
  State<PlayVideoChewie> createState() => _PlayVideoChewieState();
}

class _PlayVideoChewieState extends State<PlayVideoChewie> {
  late VideoPlayerController videoPlayerController;
  late ChewieController chewieController;

  Future initializeVideo() async {
    videoPlayerController = VideoPlayerController.network(widget.url);

    await videoPlayerController.initialize();

    chewieController = ChewieController(
      videoPlayerController: videoPlayerController,
      autoPlay: true,
      looping: true,
    );
    setState(() { });

  }

  @override
  void initState() {
    initializeVideo();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Playvid"),
      ),
      body: Container(
        height: 250,
        child: chewieController != null &&
                chewieController.videoPlayerController.value.isInitialized
            ? Chewie(
                controller: chewieController,
              )
            : Container(
                child: CircularProgressIndicator(),
              ),
      ),
    );
  }

  @override
  void dispose() {
    videoPlayerController.dispose();
    chewieController.dispose();
    super.dispose();
  }
}

any help will be valuable for me. thank you.

CodePudding user response：

because you have to

await videoPlayerController.initialize();

chewieController is only initalize after that, so it cause error. Change it like this :

class _PlayVideoChewieState extends State<PlayVideoChewie> {
  late VideoPlayerController videoPlayerController;
  ChewieController? chewieController;

  Future initializeVideo() async {
    videoPlayerController = VideoPlayerController.network(widget.url);

    await videoPlayerController.initialize();

    chewieController = ChewieController(
      videoPlayerController: videoPlayerController,
      autoPlay: true,
      looping: true,
    );
    setState(() { });

  }

  @override
  void initState() {
    initializeVideo();
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    if (chewieController == null) {
      return Container(
        child: CircularProgressIndicator(),
      );
    }
    return Scaffold(
      appBar: AppBar(
        title: Text("Playvid"),
      ),
      body: Container(
        height: 250,
        child: Chewie(
          controller: chewieController!,
        ),
      ),
    );
  }

  @override
  void dispose() {
    videoPlayerController.dispose();
    chewieController?.dispose();
    super.dispose();
  }
}

CodePudding user response：

Did you try to declare both variables like that?

ChewieController? chewieController;
VideoPlayerController? videoPlayerController;

CodePudding user response：

This is a common problem when you call a Future from initState, if the result of it is needed for the first build. The initState function is not async, so you can't use await to wait for the result of initializeVideo(). So what happens is that the build method will run earlier than chewieController is initalized.

The proper solution is to implement a FutureBuilder in the build method.

You will get the lateInitalization error even if you try to check with the below line, because with the late keyword it will throw an error if you read a variable that has not been set:

if (chewieController == null)

Refer to the documentation on how to create a FutureBuilder.