Kivy spinner not working - but Only in Android

[MrBillium]

I have a basic  spinner in a screen to choose theme colors. It works fine in Windows.

I click the spinner widget and on release, the other spinner options are displayed. I can then click & choose any of the options to hide the rest.

It works fine in Windows.

But, when running the app in Android, touching the spinner and releasing displays the option list just for a split-second ( one frame perhaps?). There are no  errors and I see nothing in logcat.

Any ideas what might be happening?

from kivy.uix.spinner import Spinner

class ThemeSpinner(Spinner):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.app = MDApp.get_running_app()
        self.values = ['Red', 'Pink', 'Purple', 'DeepPurple']
        self.text = 'Choose Theme'
        self.bind(text=self.choose)
    
    def choose(self, obj, txt):
        logger.debug(f'spinner text = {txt}')
        self.app.theme_cls.primary_palette = txt

[Bill Marriott]

Update on this.

Through trial and error I found that the source of my problem  is this statement in main:

from kivy.config import Config
Config.set('input', 'mouse', 'mouse,multitouch_on_demand')

If I comment it out everything runs fine again.

I added that statement (without understanding what it does) to solve the problem of random red dots appearing on the gui - which it did.

Here is the link  to the issue and solution https://stackoverflow.com/questions/12692851/why-does-right-clicking-create-an-orange-dot-in-the-center-of-the-circle

So is there a better way to stop the random red dots that won't break spinners in Android?

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[Elliot Garbus]

Read: https://kivy.org/doc/stable/api-kivy.input.providers.mouse.html#using-multitouch-interaction-with-the-mouse

To disable the multi-touch on Windows and Mac I use:

Config.set('input', 'mouse', 'mouse,disable_multitouch')

 

The red dot is part of the multi-touch simulation.  Disabling multi-touch for the mouse removes the red dot.

I have not done any android programming.  Does the touch on Android get reported to kivy as a mouse?

 

From: Bill Marriott
Sent: Sunday, December 18, 2022 9:01 AM
To: kivy-...@googlegroups.com
Subject: Re: [kivy-users] Kivy spinner not working - but Only in Android

 

Update on this.

 

Through trial and error I found that the source of my problem  is this statement in main:

from kivy.config import Config
Config.set('input', 'mouse', 'mouse,multitouch_on_demand')

If I comment it out everything runs fine again.

I added that statement (without understanding what it does) to solve the problem of random red dots appearing on the gui - which it did.

Here is the link  to the issue and solution https://stackoverflow.com/questions/12692851/why-does-right-clicking-create-an-orange-dot-in-the-center-of-the-circle

So is there a better way to stop the random red dots that won't break spinners in Android?

 

On Tue, Dec 13, 2022 at 11:18 AM MrBillium <bilm...@gmail.com> wrote:

I have a basic  spinner in a screen to choose theme colors. It works fine in Windows.

I click the spinner widget and on release, the other spinner options are displayed. I can then click & choose any of the options to hide the rest.

 

It works fine in Windows.

 

But, when running the app in Android, touching the spinner and releasing displays the option list just for a split-second ( one frame perhaps?). There are no  errors and I see nothing in logcat.

Any ideas what might be happening?

 

from kivy.uix.spinner import Spinner

class ThemeSpinner(Spinner):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.app = MDApp.get_running_app()
        self.values = ['Red', 'Pink', 'Purple', 'DeepPurple']
        self.text = 'Choose Theme'
        self.bind(text=self.choose)
    
    def choose(self, obj, txt):
        logger.debug(f'spinner text = {txt}')
        self.app.theme_cls.primary_palette = txt

 

 

 

 

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[Robert]

I do the same thing as Elliot (geez I hate that red dot), but never do it on Android or iOS (where the red dot does not appear).
For example (some other functionality here too):
https://github.com/Android-for-Python/c4k_photo_example/blob/main/main.py#L14-L34

[Bill Marriott]

I had not realized the dots were:

a)  a simulation

b) only happened  on my development machine.

I am quite surprised this  was enabled in the first place and cannot think of any other sw that enables testmodes or simulations by default!

Anyway the solution to disable using 'if platform' makes perfect sense and will allow me to cross this off my list of weird bugs ( down to only 2 now).

Thanks

To view this discussion on the web visit https://groups.google.com/d/msgid/kivy-users/df8dbc4f-bf6c-4845-9889-9ce00888007dn%40googlegroups.com.

[Robert]

Absolutely, grrrrr.