在 Xamarin WebView 中显示 PDF

Question

How can I download a PDF file and display it within a WebView without using an external rendering engine?

WebView webview = FindViewById<WebView>(Resource.Id.webView1);
webview.Settings.JavaScriptEnabled = true;
webview.Settings.AllowFileAccess = true;
webview.LoadUrl("http://www.justadomain.com/document.pdf");

Answer 1

试试这个：

webview.LoadUrl("https://docs.google.com/viewer?url="+"http://www.justadomain.com/document.pdf");

Answer 2

There are also many Xamarin components that offer PDF SDKs, but are unfortunately costly. For other free alternatives, you can always check this blog post which states the options you have when displaying PDF files in your application.

The easiest and maybe the cleanest solution is to let a 3rd-party application display your PDF file. Here is the java code taken from the blog post above:

using Uri = Android.Net.Uri;
Intent intent = new Intent(Intent.ActionView);
intent.SetDataAndType(Uri.Parse("file:///" + PathToFile(filename)), "application/pdf");
intent.SetFlags(ActivityFlags.ClearTop);
StartActivity(intent);
return null;

Otherwise, you can also try to find a PDF library for Android like this one and, via java bindings, import it into your Xamarin project.

Hope this helps.

Answer 3

The web engine is not capable of doing this!

If you want to display a PDF anyway you need a way to convert it to some kind of HTML. There are many tools regarding this, for example Google Drive or Mozillas PDF.js