The Android SDK contains all the required command line tools for building an Android application. It has versions for Windows, Mac, and GNU/Linux operating systems.
Android Studio is now the only officially supported IDE; nevertheless, Cocos2d-x 3.4 provides only out-of-the-box support for Eclipse, which was the former official IDE for Android development. It is no longer available for downloading, since it is not in active development any more, but you may download Eclipse manually and install the Android Development Tools (ADT) by following the steps below.
You can download Android SDK from the link: http://developer.android.com/sdk. At the bottom of the page, under Other Download Options