图像资源服务捕获的异常

Question

import 'package:flutter/material.dart';
void main(){
  runApp(MyApp());
}
class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('PITCH'),
        ),
        body: Column(
          children: <Widget>[
            new Text('WELCOME'),
            new Image(image: AssetImage('download.png'))
          ],
        ),
      ),

    );
  }
}

flutter:==图像资源服务捕获的异常：引发以下断言解析图像编解码器：flutter：无法加载资产：download.png flutter：flutter：当引发异常时，这是堆栈:flutter:#0 platformassetbundle.load（包:flutter/src/services/ashtml" target="_blank">set_bundle.dart:221:7)flutter:flutter:#1 assetbundleImageProvider._loadAsync（包:flutter/src/painting/image_provider）.Dart:464:44）颤振：颤振:#2 AssetBundleImageProvider.load（包:Flutter/src/Painting/Image_Provider.Dart:449:14)颤振:#3 ImageProvider.Resolution...（包:flutter/src/painting/image_provider.dart:316:48)flutter:#4 imageCache.putifabast（包:flutter/src/painting/image_cache.dart:160:22)flutter:#5 imageProvider.resolve.（包:flutter/src/painting/image_provider.dart:316:25)flutter：（从包dart：async中删除13帧）flutter：flutter：Image provider：AssetImage（包:null，名称：“download.png”）flutter：Image key：AssetBundleImageKey（包:platformassetbundle#EA200()，名称：“download.png”，刻度：flutter：1.0）

Answer 1

这可能是因为以下原因。

>

您忘记在pubspec.yaml文件中添加资产

您忘记运行flutter packages get命令。