Flutter - How to download files in WebView?

A similar issue can be found here!

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. It can recognize downloadable files in both Android (using setDownloadListener) and iOS platforms!

I report here the same answer that I gave to the similar issue:

To be able to recognize downloadable files, you need to set the useOnDownloadStart: true option, and then you can listen the onDownloadStart event!

Also, for example, on Android you need to add write permission inside your AndroidManifest.xml file:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

Then, you need to ask permission using the permission_handler plugin. Instead, to effectively download your file, you can use the flutter_downloader plugin.

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:

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.

just add this code to your 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

it works to me