Enabling basic authentication in webview without custom WebViewClient in Xamarin Forms - xamarin.forms

Question

I'm using a webview in my Xamarin Forms project with Hybrid Renderer and webview, because I have to inject javascript code inside the page.
In my main project I have a CustomWebview.cs:
namespace ClotureSiadForms.Renderer
{
public class CustomWebView : WebView
{
public string js = "";
public CustomWebView()
{
Navigating+= WebViewNavigating;
Navigated+=WebViewNavigated;
}
private void WebViewNavigated(object sender, WebNavigatedEventArgs args)
{
EvaluateJavaScriptAsync(js);
}
public void WebViewNavigating(object sender, WebNavigatingEventArgs args)
{
if (args.Url.StartsWith("tel:"))
{
var tel = args.Url.Split(':')[1];
args.Cancel = true;
Xamarin.Essentials.PhoneDialer.Open(tel);
}
else if (!args.Url.StartsWith("http") || args.Url.EndsWith(".apk") || args.Url.EndsWith(".pdf") || args.Url.EndsWith(".zip"))
{
args.Cancel = true;
Xamarin.Essentials.Launcher.OpenAsync(args.Url);
}
}
}
}
In my Android project I have a HybridWebViewRenderer.cs:
[assembly: ExportRenderer(typeof(CustomWebView), typeof(HybridWebViewRenderer))]
namespace ClotureSiadForms.Droid.Renderer
{
internal class HybridWebViewRenderer : WebViewRenderer
{
public HybridWebViewRenderer(Context context) : base(context)
{
}
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.WebView> e)
{
base.OnElementChanged(e);
if (Control != null)
{
CustomWebView webview = e.NewElement as CustomWebView;
Control.Settings.JavaScriptEnabled = true;
Control.Settings.DomStorageEnabled = true;
Control.Settings.SavePassword = true;
}
}
}
}
As is, it worked and was able to download files
But as I needed basic authentication, I added a custom webviewclient inside HybridWebViewRenderer.cs:
protected override void OnElementChanged(ElementChangedEventArgs<Xamarin.Forms.WebView> e)
{
base.OnElementChanged(e);
if (Control != null)
{
CustomWebView webview = e.NewElement as CustomWebView;
Control.Settings.JavaScriptEnabled = true;
Control.Settings.DomStorageEnabled = true;
Control.Settings.SavePassword = true;
var login = Preferences.Get("login", "");
var password = Preferences.Get("password", "");
Control.SetWebViewClient(new AuthWebViewClient(login, password));
}
}
public class AuthWebViewClient : WebViewClient
{
private string Username;
private string Password;
public AuthWebViewClient(string username, string password)
{
Username = username;
Password = password;
}
public override void OnReceivedHttpAuthRequest(Android.Webkit.WebView view, HttpAuthHandler handler, string host, string realm)
{
handler.Proceed( Username,Password);
}
}
And authentication works, but WebViewNavigating is now called once, then the custom client is set and then WebViewNavigating is never more called.
Then my question is, can't I use basic auth without a custom client or is there a way to keep using my customwebview with the client ?

Answer 1

And authentication works, but WebViewNavigating is now called once, then the custom client is set and then WebViewNavigating is never more called.
I tested the code you provided and added Breakpoint to WebViewNavigating method. Even if you do not add webviewclient, it will only call WebViewNavigating once.
You can put the code in WebViewNavigating to ShouldInterceptRequest:
public class AuthWebViewClient : WebViewClient
{
...
public override WebResourceResponse ShouldInterceptRequest(Android.Webkit.WebView view, IWebResourceRequest request)
{
var url = request.Url;
...
}
}
Whenever the WebView begins loading a new page, it will call ShouldInterceptRequest.