Android button setColorFilter behaviour

Question

(I changed the question a bit, because the problem is a bit clearer now)

I have 4 buttons on my application, and when a user clickes certain button I change that but

Answer 1

You just need to mutate each drawable before setColorFilter.

Drawable d = findViewById(R.id.ans2).getBackground();

d = d.mutate();
d.setColorFilter