Android Studio

Setting up an Environment:

1. Download Android Studio.
2. Download the latest SDK tools and platforms using the SDK Manager.

License clauses:

"You will protect the privacy and legal rights of those users.
If the users provide you with user names, passwords, or other login information or personal information, you must make the users aware that the information will be available to your application, and you must provide legally adequate privacy notice and protection for those users.


If your application stores personal or sensitive information provided by users, it must do so securely

If the user provides your application with Google Account information, your application may only use that information to access the user's Google Account when, and for the limited purposes for which, the user has given you permission to do so.

You acknowledge that your use of such third party applications, data, content, or resources may be subject to separate terms between you and the relevant third party."


References:
http://developer.android.com/training/basics/firstapp/index.html