How to add a library to a project?

Question

Android

I add compile 'com.google.android.gms:play-services:8.1.0' dependencies and
click sync project with gradle files. There are no errors, but I can't work with the library either. What am I doing wrong?

Answer 1

Show the code.
import not forgotten I hope.
Look at the introduction, your question may disappear.
https://developers.google.com/android/guides/overview