title: How to use Existing .so file in android application
body: <p>I was searching for library which should convert .doc/.docx to .pdf in android platform.</p>
  
  <p>I got PdFTron android sdk,in that they have given libPDFNetC.so file.</p>
  
  <p>For Conversion, there is class called Convert, inside that there is a method toPDF(),
  in that method they have internally called native method FileToPdf().I tried that code but unable to call that native method and was getting errors</p>
  
  <p>I want to know that if there is  existing .so file present with you and if you want to call native method which is present in .so file then is there need to use JNI?. i dont know much about JNI. any help.</p>