How to edit Google Android Code

I am new to google android will anyone please tell me how to edit google android code to develop my own applications?

From stackoverflow

• Use Android SDK

• I would start with The Developer's Guide:

  Welcome to the Android Dev Guide! The Dev Guide is a practical introduction to developing applications for Android. It explores the concepts behind Android, the framework for constructing an application, and the tools for developing, testing, and publishing software for the platform.

  Preet Sangha : Yes very good link I'd say!

• In Eclipse, with the Android SDK which is free at d.android.com

• It depends on your preferred programming language: the main language for Android is Java, but it also supports scripting languages like Python and Lua. For Java, you can download the Android SDK, which should have all you need to get started. Also, check out http://developer.android.com/ for tutorials, help, docs, etc.