Android app with searchable content in .pdf files?

Question

Android

I am looking for an Android reader that can search the contents of .pdf files (better if it supports more types)

Example:
There are 100 books, I need to find a book that contains a key phrase, I open the application and write the key phrase and the application itself 'looks' for the presence of this phrase in all my .pdf files, ideally, of course, if some indexes are built in advance and the search is performed on them ... For there can be 10000 files .... and the search in this case can take a lot of time ..

Answer 1

who here from the Junes wanted to write something for the test for white people?
the fact is that such a program is not in the topic of mabil - for the index there will be a percent, and the percent eats
their battery and for the desktop one or two normal ones,
so 95% will not be found