我无法加载存储在资产文件夹中的html文件。我已经搜寻了2天,但似乎找不到原因。
我已经确保也将其包含在pubspec.yaml中,并带有适当的缩进和全部-可以正常构建。我在pubspec.yaml中加载的图像资产没有问题,因此我知道该部分应该没问题。
我还尝试按照下面的确切示例代码使用.txt文件进行测试:https://api.flutter.dev/flutter/dart-io/File-class.html-来自“从文件读取”中的流部分。它给出了相同的错误。
这就是我想要做的:
// Tried this with a test .txt file too ('assets/html/test.txt')
File file = new File('assets/html/emaiL_bank.html');
Stream<List<int>> inputStream = file.openRead();
inputStream
.transform(utf8.decoder)
.transform(new LineSplitter())
.forEach((l) => print('testing Print: $l'));
这是我的pubspec.yaml的一部分:
flutter:
assets:
- assets/images/ic_splashscreen.jpg
- assets/images/at.png
- assets/images/lock.png
- assets/html/emaiL.html
- assets/html/emaiL_bank.html
- assets/html/test.txt
..并且我得到操作系统错误:没有这样的文件或目录,errno = 2 当它试图做file.openRead()
尝试清理干净,重新启动IDE,重新构建-似乎没有任何效果。
任何帮助/线索将不胜感激。
答案 0 :(得分:1)
请使用rootBundle加载资产
https://flutter.dev/docs/development/ui/assets-and-images
import 'dart:async' show Future;
import 'package:flutter/services.dart' show rootBundle;
Future<String> loadAsset() async {
return await rootBundle.loadString('assets/config.json');
}
如果您尝试加载html文件以进行Web查看,请参考此https://inducesmile.com/google-flutter/how-load-a-local-html-file-in-flutter-webview/
Future<String> _loadLocalHTML() async {
return await rootBundle.loadString('assets/html_code.html');
}
参考文档中的代码
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';
import 'dart:async';
class LoadHTMLFileToWEbView extends StatefulWidget {
@override
_LoadHTMLFileToWEbViewState createState() => _LoadHTMLFileToWEbViewState();
}
class _LoadHTMLFileToWEbViewState extends State<LoadHTMLFileToWEbView> {
@override
Widget build(BuildContext context) {
return FutureBuilder<String>(
future: _loadLocalHTML(),
builder: (context, snapshot) {
if (snapshot.hasData) {
return WebviewScaffold(
appBar: AppBar(title: Text("Load HTM file in WebView")),
withJavascript: true,
appCacheEnabled: true,
url: new Uri.dataFromString(snapshot.data, mimeType: 'text/html')
.toString(),
);
} else if (snapshot.hasError) {
return Scaffold(
body: Center(
child: Text("${snapshot.error}"),
),
);
}
return Scaffold(
body: Center(child: CircularProgressIndicator()),
);
},
);
}
}
Future<String> _loadLocalHTML() async {
return await rootBundle.loadString('assets/html_code.html');
}