[Android] Editing a TextBox located in a Popup may crash the app

[jeromelaban]

Current behavior

Opening a ContentDialog which contains a TextBox may crash the app with the following exception:

EditView android.view.WindowManager$BadTokenException: Unable to add window

Expected behavior

The application does not crash and editing the TextBox works.

Workaround

Set FeatureConfiguration.Popup.UseNativePopup to false.

Environment

Nuget Package:

Package Version(s):

Affected platform(s):

• iOS
• Android
• WebAssembly
• WebAssembly renderers for Xamarin.Forms
• macOS
• Windows
• Build tasks
• Solution Templates

Visual Studio:

• 2017 (version: )
• 2019 (version: )
• for Mac (version: )

Relevant plugins:

• Resharper (version: )

Anything else we need to know?

The issue arises when the OS is trying to add the Copy/Past dialog, and does not seem to find where to place it.

[trungnt2910]

With quite a few ComboBox-related duplicate issues closed, and the main issue quite hard to find using GitHub's search, I'd say this deserves some documentation.

Furthermore, why are native Popups the default, when they are currently faulty? This forces developers to write platform-specific code every time.

A search on Google only points to this:

[Android] Add support for non-native Popup by default. Can be enabled through FeatureConfiguration.Popup.UseNativePopup set to false (See #2533 for more details)
in some ancient release notes.

[jeromelaban]

Furthermore, why are native Popups the default, when they are currently faulty? This forces developers to write platform-specific code every time.

Native popups are not disabled by default because of side effects that we have not had the time to investigate. They are not faulty for most cases.

[Youssef1313]

I wasn't able to reproduce. @jeromelaban Is there anything needed more than the sample in SamplesApp to reproduce this?

[jeromelaban]

@Youssef1313 it may crash the app if the textbox's IME popup appears (e.g. to copy/paste text)

[MartinZikmund]

This should not be an issue anymore as we are now using the managed popups by default.