Copyright infringement issue google play (An android app)

Today I received a mail from Google which state that your app has been removed from Google play due to copyright infringement. The person who register this copyright issue is a person who run his non registered company. I was working with him a year back. A year ago I made an app for him. The app was not complete at the time of I left the company.

Because of some salary issue I left that company and his project a year ago. After that I worked in another company, and I learned a lot from my second company. So I thought that I should make the app that I left a year ago. Then I started work on the project from scratch, Every single line of code is written by me, I spent my 4 months and many sleep less night on that project.

Now when I published my app he report the copyright issue and my app is now removed from Google play. He is saying that you steal my code and Your app do the same things which my app do.

He also steal ideas from another apps, and there are hundreds of app of apps which does the same things. If this was his app then he should publish his app in Google play a year ago, but he does not publish with in a year.

How to react in this situation ? what should I do now? The app is the source of my income and I want my app back in the market.

Copyright does not protect ideas, but rather expressions. In your question, it sounds like the code or design of your app. You can visually compare your app to what is claimed to be protected (registered). Even if it is not an exact duplicate, you may have an issue. You may want to trace the origin of your code. You might want to request clarification from the copyright owner what is registered, and what he believes is infringing.

If the allegation is broader than copying code or visual design of the app, then maybe there is some question about a patent or trade secret. You can ask what trade secret or patent is being asserted.

You might want to speak with an attorney, especially since you rely on income from the app. An attorney will be able to determine the seriousness of the allegation and clear up any misunderstanding. It is probably the fastest route to getting the app back online if the allegation of infringement is incorrect. Good luck.