Android Symbol can not be resolved in fullscreen Activity

Question

I am using fullscreen activity and i am trying to read all .mp3 songs in it. but when i importing :-

import com.google.android.gms.appindexing.Action;
import com.google.android.gms.appindexing.AppIndex;
import com.google.android.gms.common.api.GoogleApiClient;

then its giving error can't resolve symbol android.

Any help will be appreciated .