NewTextColorTransition.java

public class TextColorTransition extends Transition {
  ...
  private void captureValues(@NonNull TransitionValues transitionValues) {
        if (transitionValues.view instanceof TextView) {
            Bundle extraData = (Bundle)transitionValues.view.getTag(R.id.tag_transition_extra_properties);

            int color;
            if (extraData != null && extraData.containsKey(PROPNAME_TEXT_COLOR)) {
                color = extraData.getInt(PROPNAME_TEXT_COLOR);
            } else {
                color = ((TextView) transitionValues.view).getCurrentTextColor();
            }

            transitionValues.values.put(PROPNAME_TEXT_COLOR, color);
        }
    }
  ...
}