Manually install Gradle and use it in Android Studio

I'm using Android Studio. How can I manually install and use Gradle within Android Studio.

I've downloaded Gradle from http://www.gradle.org/downloads version gradle-2.1-all.zip.

When I open the zipped file I can see bin, docs etc, but I don't know where to copy it. And even after copying how to use it within Android..

Do I need to install Gradle for Android Studio?

Android Studio comes with a working installation of Gradle, so you don't need to install Gradle separately in that case. In order to create a new build or add a Wrapper to an existing build, you will need to install Gradle according to these instructions.

https://services.gradle.org/distributions/

Download The Latest Gradle Distribution File and Extract It, Then Copy all Files and Paste it Under:

C:\Users\{USERNAME}\.gradle\wrapper\dists\