<Android gradient drawable not showing on button> ...

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Android gradient drawable not showing on button
I am rather new to StackOverFlow - so if you have problems with this question, please tell me in the comments.
I'm creating a basic Android app with a material button with a background set to a gradient drawable like so:





MainActivity:





The problem is - this used to work, but I returned to the project 2 days later and the gradient is nowhere to be seen:

enter image description here▾

Although the...