Firebase Login using GoogleSign

I'm trying to login to the application on Firebase through GoogleSign this way:

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Toast;

import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.OptionalPendingResult;
import com.google.android.gms.common.api.ResultCallback;

/**
 * A login screen that offers login via email/password.
 */
public class LoginActivity extends AppCompatActivity  implements GoogleApiClient.OnConnectionFailedListener{


    private static final String TAG = "LoginActivity";
    private final int RC_SIGN_IN = 21212;
    private GoogleApiClient mGoogleApiClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        SignInButton mSignIn = (SignInButton) findViewById(R.id.sign_in_button);
        mSignIn.setSize(SignInButton.SIZE_WIDE);
        mSignIn.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                attemptLogin();
            }
        });

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail().requestIdToken(getString(R.string.api_key))
                .build();


        mGoogleApiClient = new GoogleApiClient.Builder(getApplicationContext()).enableAutoManage(this, this).addApi(Auth.GOOGLE_SIGN_IN_API).build();

    }


    @Override
    protected void onStart() {
        super.onStart();

        OptionalPendingResult<GoogleSignInResult> opr = Auth.GoogleSignInApi.silentSignIn(mGoogleApiClient);
        if(opr.isDone()){
            Log.d(TAG, "Got cached sign-in");
            GoogleSignInResult result = opr.get();
            handleSignInResult(result);
        }else{

            opr.setResultCallback(new ResultCallback<GoogleSignInResult>() {
                @Override
                public void onResult(@NonNull GoogleSignInResult googleSignInResult) {
                    handleSignInResult(googleSignInResult);
                }
            });
        }
    }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            final GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            handleSignInResult(result);
        }
    }
    private void handleSignInResult(GoogleSignInResult result) {
        if (result.isSuccess()) {
            // Signed in successfully, show authenticated UI.
            GoogleSignInAccount acct = result.getSignInAccount();
            final String token = acct.getIdToken();
            final String name = acct.getDisplayName();
            final String serverAuth = acct.getServerAuthCode();
            Toast.makeText(getApplicationContext(), token, Toast.LENGTH_SHORT).show();
        }else{
            Toast.makeText(getApplicationContext(), R.string.no_login, Toast.LENGTH_SHORT).show();
        }
    }
    private void attemptLogin() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);


    }
    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }
}

My problem is that it always returns null in method handleSignInResult !

I created this project through Firebase, I added the google-services.json file in the app folder and added the permission of Internet !

My question is if you need to release something on console.developer.google.com"> console.developer.google.com or when you enable this option on console.firebase.google.com already fvaz this whole process?