Android Symbol can not be resolved in fullscreen Activity - android

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 .

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Cannot resolve Symbol Context in import android.content.Context

import android.content.Context; Context appears in red. And on placing my mouse over it the error is Cannot resolve Symbol Context. It was working before but now something happened.

No proposals have been found to fix the unresolvable reference to 'com.google.android.gms.ads.AdView'

I dont know how it happend.Now in my code it says 'The import com.google.android.gms.ads cannot be resolved'.I have tried all the results in the answers here including this and this
I'm stuck with it.
It still exists. google play services is there. Im not sure about my attempts were in right path or not.So helpers pls describe it in step by step.thanks in advance.
import com.google.android.gms.ads.AdSize;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.analytics.GoogleAnalytics;
ERROR:
The import com.google.android.gms.ads cannot be resolved

Unable to import OpenCVLoader

Unable to import org.opencv.android.OpenCVLoader;
I'm new to Opencv.I was trying to load opencv libraries.
but I was unable to import "org.opencv.android.OpenCVLoader"
anything I need to download from SDK manager

Java error trying to add admob

It shows red errors and I followed the instruction in Google site. Only prob in Java
mAdView.loadAd(adRequest)
Unknown class:'adRequesr'
Cannot resolve symbol loadAd

maybe
You are using the wrong import for AdRequest
like this
import com.google.android.gms.ads.AdRequest;
instead of
import com.google.ads.AdRequest;
use this import hope it will help you.

You have defined or imported a class called adRequestr. There is no such class.
You should be importing com.google.android.gms.ads.AdRequest

Cant import OnStateLoadedListeer

I'm trying to implement Google Play Services. When I try to import the OnStateLoadedListener
import com.google.android.gms.appstate.OnStateLoadedListener;
AndroidStudio says "Cannot resolve Symbole OnStateLoadedListener"
How can I fix that?

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