title: Having .apk can extract its source code. Does Android app is secure?
body: <p>I develop Android app and some of the codes are very private and confidential. I make encryption algorithm into my code to increase the safety. </p>
  
  <p>But recently I read, when people having an .apk file, they can extract the java source code with 100% correct <a href="http://www.coders-hub.com/2013/04/how-to-convert-apk-file-into-source.html#.WHBLRlV9600" rel="nofollow noreferrer">Source</a>.</p>
  
  <p>Not just that, people also can get .apk from Google Play Store <a href="http://www.technotraps.com/how-to-download-apk-files-directly-from-play-store/" rel="nofollow noreferrer">Source</a> </p>
  
  <p>Does it means people who has my .apk can view all my source code(java, .xml layout, library)? If yes, all my hard work to have a secure app is not achieved. </p>