nothing of earth shattering here. I agree with most of the comments. Kreci- I don't mind marketing the ebook at the end. The problem is if you write something so little people will doubt about the content of the ebook too.
anyone can google "how to write android app" or "how to become an android developer". There would be tons of useful links relative links. What you can/should do is make your article unique. Some of the ideas are a) what are the steps involved in developing, submitting and marketing an android app, b) steps in developing android apps for novice developers (google dev site can be overwhelming for newbies). Just some thoughts :-)