Yeah, it took me a LOOOONNNGGGG time to finally figure this out, even after reading much of the documentation. I’m assuming that this is only a problem for people who have never ever created a mobile application. Even after reading all of the documents about signing apks, I was still pretty unsure. Then I watched this quick video:
It basically covers the steps outlined in another link that was cited here ( http://developer.android.com/tools/publishing/app-signing.html#cert ) but I guess I’m the kind of person who needs to see someone do it first. I didn’t realize you had to access the keytool from the command line until I watched the video I linked to above.
Anyway, after I watched that basic video, and after I was able to reproduce it, and do the same thing, I was still unsure of what to do. Then I read the following post:
That post tells you how to alter the main SigningConfig.xml file. I did that in notepad. I then saved it to my project’s folder. Then, when I went to build the project for shipping, it finally worked!
However, even though I was finally able to upload my .apk to Google Play, I have not been able to figure out how to upload the .obb files. I was live-chatting with their help, and they were like, “when you upload your .apk, it will ask you to upload your extension files”, but I did that so many times, and have not yet seen anything asking me to upload the extension files. So, good luck with that.