Custom indicator

Hi,

for larger number of slides (>20) I think it would be better to change indicator from dot or rect to number format: "actual / total" e.g. 1/20. Is there any way to achieve this with your library?
Something like using onPageSelected() from OnPageChangeListener to get current position. Total slide count is not a problem, I know how many images are in slider. And finally display this instead of default indicator...

Thanks in advance