 information necessary to run
  your application on a device or emulator, such as compiled <code>.dex</code> files (<code>.class</code> files
  converted to Dalvik byte code), a binary version of the <code>AndroidManifest.xml</code> file, compiled
  resources (<code>resources.arsc</code>) and uncompiled resource files for your application.</p>

  <p>If you are developing in Eclipse, the ADT plugin incrementally builds your project as you
  make changes to the source code. Eclipse outputs an <code>.apk</code