No one using App Inventor can change the Text or background color. Sorry.
Regards,
Steve
TimAI2
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Feb 1, 2018, 6:47:11 PM2/1/18
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to MIT App Inventor Forum
As a workaround, add a button, set the click action to call the spinner. Resize the spinner to 1px by 1px (it must be visible otherwise it doesn't work!)
Set colour of button to colour of your choosing :)