This can be done in two ways- 1] Download any PDF to Text converter from Play Store and then convert your file. 2] Using Extract Pdf Pages reader open your PDF file and copy your text from it and paste the text in a doc file or notes app on android. Hope this helps.
Please Note: 1. This is a basic extract of how to convert PDF files in Text format. You can convert PDF files in all other formats, but it is not required. 2.