프래그먼트에 현재 위치를 띄우는 작업중 오류가 발생합니다 ㅠ

Question

public class MapsFragment extends Fragment
        implements OnMapReadyCallback ,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener
{
    private static final LatLng DEFAULT_LOCATION = new LatLng(36.109, 126.975);
    private static final String TAG = "googlemap_example";
    private static final int GPS_ENABLE_REQUEST_CODE = 2001;
    private static final int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 2002;
    private static final int UPDATE_INTERVAL_MS = 15000;
    private static final int FASTEST_UPDATE_INTERVAL_MS = 15000;

    private GoogleMap googleMap = null;
    private MapView mapView = null;
    private GoogleApiClient googleApiClient = null;
    private Marker currentMarker = null;
    private FusedLocationProviderClient mFusedLocationClient;

    public MapsFragment()
    {
        
    }

    public void setCurrentLocation(Location location, String markerTitle, String markerSnippet) {
        if ( currentMarker != null ) currentMarker.remove();

        if ( location != null) {
          
            LatLng currentLocation = new LatLng( location.getLatitude(), location.getLongitude());

            MarkerOptions markerOptions = new MarkerOptions();
            markerOptions.position(currentLocation);
            markerOptions.title(markerTitle);
            markerOptions.snippet(markerSnippet);
            markerOptions.draggable(true);
            markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_BLUE));
            currentMarker = this.googleMap.addMarker(markerOptions);

            this.googleMap.moveCamera(CameraUpdateFactory.newLatLng(currentLocation));
            return;
        }

        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(DEFAULT_LOCATION);
        markerOptions.title(markerTitle);
        markerOptions.snippet(markerSnippet);
        markerOptions.draggable(true);
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
        currentMarker = this.googleMap.addMarker(markerOptions);

        this.googleMap.moveCamera(CameraUpdateFactory.newLatLng(DEFAULT_LOCATION));
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(getActivity());

    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View layout = inflater.inflate(R.layout.fragment_map, container, false);

        mapView = (MapView)layout.findViewById(R.id.map);
        mapView.getMapAsync(this);

        return layout;
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mapView.onSaveInstanceState(outState);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

   
        MapsInitializer.initialize(getActivity().getApplicationContext());

        if(mapView != null)
        {
            mapView.onCreate(savedInstanceState);
        }
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        // OnMapReadyCallback implements 해야 mapView.getMapAsync(this); 사용가능. this 가 OnMapReadyCallback

        this.googleMap = googleMap;

        //런타임 퍼미션 요청 대화상자나 GPS 활성 요청 대화상자 보이기전에 지도의 초기위치를 서울로 이동
        setCurrentLocation(null, "위치정보 가져올 수 없음", "위치 퍼미션과 GPS 활성 여부 확인");

     
        googleMap.getUiSettings().setCompassEnabled(true);
       
        googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));

    
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                // 사용권한체크
                int hasFineLocationPermission = ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION);

                if (hasFineLocationPermission == PackageManager.PERMISSION_DENIED) {
                    
                    ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
                } else {
                
                    if (googleApiClient == null) {
                        buildGoogleApiClient();
                    }

                    if (ActivityCompat.checkSelfPermission(getActivity(), Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                        googleMap.setMyLocationEnabled(true);
                    }
                }
            } else {

                if (googleApiClient == null) {
                    buildGoogleApiClient();
                }

                googleMap.setMyLocationEnabled(true);
            }

    }
int check = 0;
    private void buildGoogleApiClient() {

        if (googleApiClient != null) googleApiClient.disconnect();

            googleApiClient = new GoogleApiClient.Builder(getActivity())
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .addApi(Places.GEO_DATA_API)
                    .addApi(Places.PLACE_DETECTION_API)
                    .enableAutoManage(getActivity(), this)
                    .build();


        googleApiClient.connect();

    }

}

처음에 프래그먼트를 작동시키면 잘되는데

다른프래그먼트를 띄웠다가 다시 맵을 띄우면 에러가 납니다.

이게 에러 메세지 입니다. 코드는 8000자 이내라 잘라서 올리겠습니다. 마지막 부분이 에러가 나는 부분 입니다.

 java.lang.IllegalStateException: Already managing a GoogleApiClient with id 0
        at com.google.android.gms.common.internal.Preconditions.checkState(Unknown Source:29)
        at com.google.android.gms.common.api.internal.zaj.zaa(Unknown Source:14)
        at com.google.android.gms.common.api.GoogleApiClient$Builder.build(Unknown Source:135)
      ->  at com.example.ddareureung.MapsFragment.buildGoogleApiClient(MapsFragment.java:275)
      -> at com.example.ddareureung.MapsFragment.onMapReady(MapsFragment.java:231)

 googleApiClient가 null이 아닐때 build하지 않으면 된다고는 하는데 어떻게 해야 할지 감이 안잡히네여