isabellekim 36b760d220 Change ripples on MaterialButton to use the alphas provided in the ColorStateList.
RippleDrawable on different API levels will modulate the alphas differently
for the pressed / focused / hovered states. Therefore, in order to get the
desired alphas for pressed / focused / hovered states, we are using the
mtrl_(low|high)_ripple_(pressed|focused|hovered|default)_alpha values which have
been defined to account for the different implementations of RippleDrawable.

This will allow developers to specify different colors for focused vs. pressed if desired.

PiperOrigin-RevId: 255306749
2019-07-03 13:50:29 -04:00
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