Hi, i want to start developing app for the andriod paltform and i want to know how to start.
i have knowlegded in C#.

For android app development, you have knowledge of Java. Further you can find help Click Here

You can develop Native applications using HTML and Java Script that can be used in windows.

As a developer, you know that the first impression of a development framework is how easy it is to write "Hello, World." Well, on Android, it's pretty easy. It's particularly easy if you're using Eclipse as your IDE, because we've provided a great plugin that handles your project creation and management to greatly speed up your development cycles.