Dialogs not working in Android

[mat-l]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. Go to

   toga/examples/dialogs/dialogs/app.py

   Line 75 in 19e89a7

   def action_select_folder_dialog(self, widget):

2. I build the Android app with 'briefcase create android' and 'briefcase build android' with Docker in the background.

Expected behavior
Using 'briefcase dev' I am able to run the application on my Linux laptop and the 'select_folder_dialog' or 'open_file_dialog' are working.
On Android the file or fodler picking function is not working

Screenshots
Instead of file picking it is only showing this:

Instead of the question it is only showing this:

Environment:

• Operating System: Linux Fedora 33
• Python version: 3.9.2
• Software versions:
  • Briefcase: briefcase 0.3.5
  • Toga:
  • toga-core 0.3.0.dev26; toga-gtk 0.3.0.dev26; toml 0.10.2

Additional context
Add any other context about the problem here.

[freakboy3742]

Thanks for the report. File dialogs aren't currently implemented on mobile platforms (although #1158 exists as a potential fix for file dialogs on Android).

However, we don't track "not implemented yet" features as bugs, as it doesn't help us manage the task of managing the list of features that need to be implemented.

[mat-l]

@freakboy3742 Thanks for your quick feedback.
Maybe the documentation should be adjusted, as this site communicates, that the window functions do work already on all platforms.

https://toga.readthedocs.io/en/latest/reference/api/window.html