public void setDefaultIndicatorColor(int selectedColor,int unselectedColor){
        if(mUserSetSelectedIndicatorResId == 0){
            mSelectedGradientDrawable.setColor(selectedColor);
        }
        if(mUserSetUnSelectedIndicatorResId == 0){
            mUnSelectedGradientDrawable.setColor(unselectedColor);
        }
        resetDrawable();
    }
if you are using the default indicator , this method will help you to set the selected status and
the unselected status color.
@param selectedColor
@param unselectedColor
library/src/main/java/com/daimajia/slider/library/Indicators/PagerIndicator.java