Unable to locate the android SDK tools error
its easy with the new versions of Android Studios(2.0 or higher), all you need is good internet connection.

First you will open the AVD manager, then you attempt to create a new device.
You will be diverted to new window where you will pick a hardware and navigate using a "next button" to a page where you will see all the API and you can download and install directly from there. Just click on Download and it will download and install automatically.