Does all drawing in Android happen in a single thread?

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I have custom checkbox PNGs. I didn't create disabled images; instead, the custom drawable, when drawing a disabled checkbox, sets a "graying-out" color filter to the state-list drawable and then draws it. That worked quite well until version 4.4.4. Unfortunately, in Android L, once a disabled checkbox is drawn, this color filter is applied to all checkboxes as soon as they are redrawn.

I am wondering whether drawing in Android L happens in multiple threads. That's the only explanation I can find for this "propagation" of the color filter to the other checkboxes...

asked 57 secs ago

user1334767

58

Does all drawing in Android happen in a single thread?