How to make HybridWebView go back when device back button is pressed

Issue

I have a Xamarin.Forms app with a HybridWebView and a HybridWebViewRenderer in the Droid project.

I am trying to make the web view navigate back when the device's back button is pressed.

It looks pretty simple if I was just using a Xamarin.Forms WebView within my page. I would just do it like this...

protected override bool OnBackButtonPressed()
{
    _webView.GoBack();
    return true;
}

But the HybridWebView does not have a GoBack() method.

In my Droid project, the only place where I have access to the WebView is in the HybridWebViewRenderer but I cannot listen for the OnBackButtonPressed event here.

Anyone know how I can make a HybridWebView navigate back when the device's back button is pressed?

Solution

Calling window.history.back(); from Javascript might be a dirty solution.

Also, calling the renderer's method from a PCL class should not be a problem.

The PCL class:

public class MyHybridWebView : HybridWebView
{
    public event EventHandler<EventArgs> DoSomeNative;

    public void CallNative()
    {
        DoSomeNative(this, EventArgs.Empty);
    }
}

The renderer:

public class MyHybridWebViewRenderer : HybridWebViewRenderer
{
    protected override void OnElementChanged(ElementChangedEventArgs<View> e)
    {
        base.OnElementChanged(e);

        if (e.OldElement != null || Element == null)
        {
            return;
        }

        (e.NewElement as MyHybridWebView).DoSomeNative += (sender, args) =>
        {
            //Do something
            //Don't forget to unsubscribe in Dispose
        };
    }
}

Answered By - Mikalai Daronin