TOPIC:

I am sorry Mr.,
How to set margin in every page?
like reader in google play book.

Dear user,
this should work only in the "single page" modes:
you can achieve this by varying the value of m_page_gap, inside PDFLayout.java

You can also use two set methods, to do it programmatically:
or
If you want to change the color of the background below, just edit the value of Global.readerViewBgColor

Thanks Mr, I will try it.