Is there any way to open pdf url in web view

Question

Hi, I was trying to open pdf url in webview in .NET MAUI but it was showing blank screen.

 <WebView
        x:Name="web_view"
        Source="https://s29.q4cdn.com/175625835/files/doc_downloads/test.pdf"
        />

Answer 1

Hello,

You can open pdf URL by WebView in the iOS and windows platform directly.

For android, you can do this by enabling the JavaScript and adding URL prefix before you open the URL.

Firstly, you can create control that extend the WebView Control.

public class PDFViewForUrl : WebView{  }

Then use it in your xaml layout.

<ContentPage 
...
             xmlns:local="clr-namespace:yourProjectName"
             >
  <local:PDFViewForUrl
         WidthRequest="500"
         HeightRequest="500"
         Source="https://s29.q4cdn.com/175625835/files/doc_downloads/test.pdf"
     />

In the end, you can enable the JS and add pre-fix before your pdf URL by Handler.

Microsoft.Maui.Handlers.WebViewHandler.Mapper.AppendToMapping("MyCustomization", (handler, view) =>
            {
#if ANDROID
                if (view is PDFViewForUrl)
                {
                    handler.PlatformView.Settings.JavaScriptEnabled = true;
                    string res = "";
                    if (view != null)
                    {
                        WebView webView = view as WebView;
                        if (webView.Source.GetType().Equals(typeof(UrlWebViewSource)))
                        {
                            UrlWebViewSource uriwebviewSource = webView.Source as UrlWebViewSource;
                            res = string.Format("https://drive.google.com/viewerng/viewer?url={0}", uriwebviewSource.Url.ToString());
                        }
                    }
                    handler.PlatformView.LoadUrl(res);
                }
#endif
            });

Best Regards,

Leon Lu

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