Here's the use case:
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 (http://appinventor.googlelabs.com/about/) or Corona (http://www.anscamobile.com/corona/). 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.
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?
Some have suggested using an apk decompiler, 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?
Or will we need to build 2 separate apps? :(
A project written in App Inventor cannot be exported into Eclipse.
The created .apk file is not a binary file. It is a ZIP archive of several files and folders, but none of them is java code.
What can be done to combine an App Inventor app with an app created with Android SDK is to make use of the ActivityStarter component inside App Inventor. Details on that are here: http://appinventor.googlelabs.com/learn/reference/other/activitystarter.html
Finally, keep in mind that App Inventor apps cannot be uploaded directly to the Market. However, some users have created a process that allows to do that, it is called Marketizer.
If you spend some time reading posts from this forum: programming-with-app-inventor (it is a Google Groups forum), you might get even better ideas.
You may consider building dependency Project A as a JAR and include that JAR-file to the build path of your dependent Project B.
To do that in Eclipse yo should click Export > Java > JAR > { Select project & unselect AndroidManifest.xml } > Finish
If you do not exclude AndroidManifest.xml from your Project A, you will get an issue saying there are duplicating manifest files described here.
Also you might get the following error:
conversion to dalvik format failed with error 1
To fix that just clean & rebuild your project
I tried that for two projects having reference for the same version of Android SDK and it worked. Note that if you need to run activity from the Project A you also need to declare it in the manifest of the Project B
来源：https://stackoverflow.com/questions/5367044/integrate-an-android-app-apk-into-an-existing-android-project