RichTextEditor: [Android] Error: "Cannot open url: file:///android_asset" in shell navigation with Maui 9.0.70 and above

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Last Updated: 13 Aug 2025 07:40 by ADMIN

Release 11.1.0 (2025 Q3)

Kevin

Created on: 07 Jul 2025 14:13

Category: UI for .NET MAUI

Type: Bug Report

RichTextEditor: [Android] Error: "Cannot open url: file:///android_asset" in shell navigation with Maui 9.0.70 and above

When navigating to a page with a RadRichTextEditor, it sometimes pops up an error on page load. It is inconsistent, but I attached an example gif. The xaml on the page I'm navigating to is basic:

I believe this problem started with MAUI version 9.0.70. Possibly with one of these changes:

https://github.com/dotnet/maui/pull/27003/files

https://github.com/dotnet/maui/pull/28354/files

Attached Files:

rich-text-editor-error.gif

8 comments

ADMIN

Didi

Posted on: 01 Aug 2025 11:25

Hello Alex,

Thank you for the additional details.

On my side the behavior happens on a concrete android simulator when using maui 9.0.70 version and above, with version 9.0.60 the issue does not occur on this emulator. So for sure there is something related to the maui version, as there are changes in maui 9.0.70 related to the WebView control. The RichTextEditor uses the WebView internally.

Regarding to the navigation, if you can send sample setup for the prism in which the issue happens, that could be of help.

Regards,
Didi
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Alex

Posted on: 01 Aug 2025 09:50

Also worth mentioning we are experiencing this in an app thats using Prism, not shell for navigation.

Alex

Posted on: 01 Aug 2025 09:50

We have been seeing this issue for longer than 9.0.60, its less of a version issue and more of a device issue.

My development devices don't display this error:

Samsung A21S
Samsung Galaxy Tab A8
Xiaomi Redmi 7

Our testers do have this issue on the following devices:

Google Pixel 8
Honor Magic5 Lite 5G

ADMIN

Didi

Posted on: 28 Jul 2025 15:25

Hello Carolyn,

The issue is escalated to the dev team. When there is an update this will be addressed here in the public item. For now the status is Unplanned and I cannot commit when a fix will be provided.

Regards,
Didi
Progress Telerik

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Carolyn

Posted on: 28 Jul 2025 15:19

Will there be a fix for this in an upcoming release?

ADMIN

Didi

Posted on: 08 Jul 2025 06:56

Hi Kevin,

Thank you for the confirmation.

I have updated the status of the item to Unplanned and raised its priority. Yes the error dialog appears in MAUI 9.0.70 and above. I tested with 9.0.61 and no issues. I have also set a source to the RichTextEditor and still the error message appears.

I have replaced the RichTextEditor with a WebView but the error message does not appear in the WebView.

Regards,
Didi
Progress Telerik

Kevin

Posted on: 07 Jul 2025 15:50

Hi Didi,

I am using shell navigation. And yeah, that's what I was thinking regarding the WebView.

ADMIN

Didi

Posted on: 07 Jul 2025 15:48

Hello Kevin,

I created a sample app to test the scenario and I reproduced the behavior in shell navigation, in navigation page no issues. Could you please share what is the navigation you use in the app?

The shared links from Maui GitHub repo are for changes done in the WebView. The RichTextEditor control uses internally a WebView, so this could be the reason for such error message.

Looking forward to your reply.

Regards,
Didi
Progress Telerik

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