How do I download Android source code and connect it in Eclipse?

I want to see the Android source code, but I don't know how to download it. I only find the address on Stack Overflow.

So my questions are:

1. How do I download the source code from the site https://android.googlesource.c开发者_如何学Goom/?
2. How do I install the source code in Eclipse?

You can use Git to download single projects, or you can get the whole tree by following the instructions posted here: https://source.android.com/source/downloading

If you have the full tree you can use the IDE support files located in development/ide/eclipse.

Warning: The full tree is big. Be sure you have plenty of time and available bandwidth quota, if applicable.