Is internship/training is must to get job as Android Developer?

To be an Android Developer, self study is the key. But android is a kind of niche and most of the time you need a good guidance. there are several institutes in India, offering such kind of training. To make Android applications you must first learn the Android SDK. Then look for a compiler that works for Android operating system. The following are the three important things mandatory to develop android application.

1. Latest SDK (Software Development Kit)
2. IDE (Integrated Development Environment ) like NetBeans or Eclipse (free)
3. Simulator to test the applications, usually comes with the SDK.

This is a good starting point -> http://developer.android.com/index.html

Your final step is to send the finished application to the Android app store. It will be checked over and you can specify a price. (There might be a small fee for the compiler and having it put in the app store. check the Google Android site for more information.)