Download files in MAUI Android WebView

I have a WebView in a MAUI app that generally works, but whenever I click a link on Android that is supposed to download a file (link returns a Content-Disposition header) nothing happens.

How is this supposed to be implemented? I can't find any documentation.

<WebView
    x:Name="WebView"
    Source=".." />

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();
    }

    protected override bool OnBackButtonPressed()
    {
        base.OnBackButtonPressed();

        if (WebView.CanGoBack)
        {
            WebView.GoBack();
            return true;
        }
        else
        {
            base.OnBackButtonPressed();
            return true;
        }
    }
}

Related question for iOS: Download files in MAUI iOS WebView

Solution

For the android, you can try to add a DownloadListener to the webview. I have testd it and the file can download successfully.

Create the custom downloadlistener class in the \Platforms\Android:

    public class MyDownLoadListener : Java.Lang.Object, IDownloadListener
    {
        public void OnDownloadStart(string url, string userAgent, string contentDisposition, string mimetype, long contentLength)
        {
            var manager = (DownloadManager)Microsoft.Maui.ApplicationModel.Platform.CurrentActivity.GetSystemService(global::Android.App.Application.DownloadService);
            var uri = global::Android.Net.Uri.Parse(url);
            DownloadManager.Request downloadrequest = new DownloadManager.Request(uri);
            downloadrequest.SetNotificationVisibility(DownloadVisibility.VisibleNotifyCompleted);
            manager.Enqueue(downloadrequest);
        }
    }

In the page's xaml:

 <WebView x:Name="webview" Source="https://www.myfreemp3.com.cn/" HeightRequest="500"/>

And set the listener for the webview in the Page.cs:

   protected override void OnHandlerChanged()
    {
        base.OnHandlerChanged();
#if ANDROID
        (webview.Handler.PlatformView as Android.Webkit.WebView).SetDownloadListener(new Platforms.Android.MyDownLoadListener());
        (webview.Handler.PlatformView as Android.Webkit.WebView).Settings.JavaScriptEnabled = true;
        (webview.Handler.PlatformView as Android.Webkit.WebView).Settings.DomStorageEnabled = true;
#endif
    }