title: Change background color and text color of a PDFView in Android Studio
body: <p>It is my first question in here, so please tell me if you need more context. 
  I am using a PDFView in my app by compiling this : compile 'com.github.barteksc:android-pdf-viewer:2.6.1'. </p>
  
  <p>I am capable of showing up my black and white PDF in my app ( I placed them in assets folder and I only call them by their name in my program ; for example : "file.pdf" ). Now I just need to change the colors of the background and the text.</p>
  
  <p>Can someone help me get through it please ? </p>