[英]Flutter - How to download files in WebView?
I am using flutter_webview_plugin: ^0.3.8
but I have the same problem with webview_flutter: ^0.3.13
.我正在使用
flutter_webview_plugin: ^0.3.8
但我对webview_flutter: ^0.3.13
: ^0.3.13 有同样的问题。
In webview, I want to make use of a website which triggers a file download on successful completion of a captcha.在 webview 中,我想使用一个在成功完成验证码时触发文件下载的网站。 However, I complete the captcha and nothing happens, no download.
但是,我完成了验证码,没有任何反应,没有下载。
Is there something in Flutter like a webview download listener ("webview.setDownloadListener")? Flutter 中是否有类似 webview 下载监听器(“webview.setDownloadListener”)的东西? I only need this for Android.
我只需要这个用于Android。
If not, is there a way of downloading files from a webview in Flutter?如果没有,有没有办法从 Flutter 中的 webview 下载文件?
A similar issue can be found here !可以在这里找到类似的问题!
You can use my plugin flutter_inappwebview , which is a Flutter plugin that allows you to add inline WebViews or open an in-app browser window and has a lot of events, methods, and options to control WebViews.你可以使用我的插件flutter_inappwebview ,它是一个 Flutter 插件,允许你添加内联 WebView 或打开应用内浏览器窗口,并且有很多事件、方法和选项来控制 WebView。 It can recognize downloadable files in both Android (using
setDownloadListener
) and iOS platforms!它可以识别 Android(使用
setDownloadListener
)和 iOS 平台中的可下载文件!
I report here the same answer that I gave to the similar issue:我在这里报告我对类似问题给出的相同答案:
To be able to recognize downloadable files, you need to set the useOnDownloadStart: true
option, and then you can listen the onDownloadStart
event!为了能够识别可下载的文件,需要设置
useOnDownloadStart: true
选项,然后才能监听onDownloadStart
事件!
Also, for example, on Android you need to add write permission inside your AndroidManifest.xml
file:此外,例如,在 Android 上,您需要在
AndroidManifest.xml
文件中添加写入权限:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
Then, you need to ask permission using the permission_handler plugin.然后,您需要使用permission_handler插件请求许可。 Instead, to effectively download your file, you can use the flutter_downloader plugin.
相反,为了有效地下载文件,您可以使用flutter_downloader插件。
Here is a complete example using http://ovh.net/files/ (in particular, the http://ovh.net/files/1Mio.dat as URL) to test the download:这是一个使用http://ovh.net/files/ (特别是http://ovh.net/files/1Mio.dat作为 URL)来测试下载的完整示例:
import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_inappwebview/flutter_inappwebview.dart';
import 'package:flutter_downloader/flutter_downloader.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';
Future main() async {
WidgetsFlutterBinding.ensureInitialized();
await FlutterDownloader.initialize(
debug: true // optional: set false to disable printing logs to console
);
await Permission.storage.request();
runApp(new MyApp());
}
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => new _MyAppState();
}
class _MyAppState extends State<MyApp> {
InAppWebViewController webView;
@override
void initState() {
super.initState();
}
@override
void dispose() {
super.dispose();
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: const Text('InAppWebView Example'),
),
body: Container(
child: Column(children: <Widget>[
Expanded(
child: InAppWebView(
initialUrl: "http://ovh.net/files/1Mio.dat",
initialHeaders: {},
initialOptions: InAppWebViewGroupOptions(
crossPlatform: InAppWebViewOptions(
debuggingEnabled: true,
useOnDownloadStart: true
),
),
onWebViewCreated: (InAppWebViewController controller) {
webView = controller;
},
onLoadStart: (InAppWebViewController controller, String url) {
},
onLoadStop: (InAppWebViewController controller, String url) {
},
onDownloadStart: (controller, url) async {
print("onDownloadStart $url");
final taskId = await FlutterDownloader.enqueue(
url: url,
savedDir: (await getExternalStorageDirectory()).path,
showNotification: true, // show download progress in status bar (for Android)
openFileFromNotification: true, // click on notification to open downloaded file (for Android)
);
},
))
])),
),
);
}
}
Here, as you can see, I'm using also the path_provider plugin to get the folder where I want to save the file.在这里,如您所见,我还使用path_provider插件来获取要保存文件的文件夹。
just add this code to your AndroidManifest.xml只需将此代码添加到您的 AndroidManifest.xml
<provider
android:name="vn.hunghd.flutterdownloader.DownloadedFileProvider"
android:authorities="${applicationId}.flutter_downloader.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/provider_paths"/>
</provider>
and add this code to your AndroidManifest.xml并将此代码添加到您的 AndroidManifest.xml
it works to me它对我有用
it works for me这个对我有用
require plugin https://pub.dev/packages/url_launcher需要插件https://pub.dev/packages/url_launcher
add this code to your project to download file from flutter webview将此代码添加到您的项目中以从 Flutter webview 下载文件
onDownloadStart: (controller, url,) async {
// print("onDownloadStart $url");
final String _url_files = "$url";
void _launchURL_files() async =>
await canLaunch(_url_files) ? await launch(_url_files) : throw 'Could not launch $_url_files';
_launchURL_files();
},
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