Leafster

This application uses the Google Books api to enable you to search through its millions of books directly from your Android phone or tablet.

This is the only Android app that also allows you to see Google Books limited previews on your phone or tablet and to download public domain books from the Google Books repository in pdf or epub format for free*.

You can also purchase available books in electronic form from the Google eBooks store.

Search results can be sorted according to relevance or publication date. The option to select your own language is also available.

* To read books in pdf or epub formats you will need to download and install a pdf or epub reader on your phone.

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As featured on XDA (26 December 2019):

"Leafster is a powerful search tool for the Google Books database"

https://www.xda-developers.com/leafster-search-tool-google-books-database/