title: how to import ZXING library in android application?
body: <p>I need to implement ZXING QR code scanner in my application.
  I have complete source code for ZXING Android.
  Now, I want to use this in my application.
  my question is that should I copy all ZXING library code in my application including manifest,xml and java files or I can have a jar file which I need to just add in my application? 
  Can anybody tell me how to create jar file from android code, or is any ZXING jar already available which I can just include in my application? </p>