Q:

How can do Scrollable View and this get the position?

How can do a scrollable view, and this gets the position in the view and change the placeholder . The information in the view must be charged from the DataBase and it must change with the time. 

How can do the placeholder?
can i do that the Placeholder change if i use a horizontalscrollview , and the placeholder be independent ?
another idea to do this?

A:

This is exactly what you want. A viewpager indicator. Check it out - 
Jack Wharton's View Pager Indicator library

