title: Displaying PDF file in fragments
body: <p>I have to display a PDF file that has about 15 pages. I need to display the PDF file in a fragment and change pages every few seconds. I have several questions: 1)what do I use to display the PDF file (PDFTron, MuPDF or AndroidPDF), 2)is it free to use the PDF tools and 3) how do I implement changing pages? Still quite new to Android development and have a difficult task ahead.</p>