title: Integrate an Android app (.apk) into an existing Android project
body: <p>Here's the use case:</p>
  
  <p>A friend and I are building an Android app and along with it want to integrate a game.  The core of the app has been built in Eclipse but we are looking into building the game with an app building tool like Google AppInventer (<a href="http://appinventor.googlelabs.com/about/" rel="noreferrer">http://appinventor.googlelabs.com/about/</a>) or Corona (<a href="http://www.anscamobile.com/corona/" rel="noreferrer">http://www.anscamobile.com/corona/</a>).  We'd like the existing app we've built to have a button like "Play Game" which will launch the game we build using one of these utilities.</p>
  
  <p>However when I messed around with Google App Inventor I noticed that I could only export the project as a .apk, which are binary files.  Ideally, I'd build the app in AppInventor, export the source code and add the package to our existing project in Eclipse.  Well, it's not that easy since we only have access to a .apk file.  So my question is can this be done?  How?</p>
  
  <p>Some have suggested using an <strong>apk decompiler</strong>, but would this even be worth it?  Are there any good apk decompilers that will give us access to some source code (java files, xml files, resources) without too big of a headache?  Is there another tool out there that can export source code?  Any other way to integrate 2 separate .apks?</p>
  
  <p>Or will we need to build 2 separate apps? :(</p>