尝试获取当前位置时，FusedLocationProviderAPI始终返回null

Question

无数个小时，我一直试图在启动我的应用时获取用户的当前位置，但之后我尝试的每个方法都返回了null。

我对GoogleApiClient的实例化发生在＆＃34; onCreate＆＃34;

＆＃13;

＆＃13;

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        EventBus.getDefault().register(this);
        FirebaseMessagingHelper.registerDevice(this, FirebaseInstanceId.getInstance().getToken());

        activity = this;

        //xaxaxa

        driverMapView = (MapView) findViewById(R.id.googleMapObject);
        driverMapView.onCreate(savedInstanceState);
        driverMapView.getMapAsync(this);

        getUserToEnableCameraUsage();

        if (googleApiClient == null)
        {
            googleApiClient = new GoogleApiClient.Builder(this)
                    .addConnectionCallbacks(this)
                    .addOnConnectionFailedListener(this)
                    .addApi(LocationServices.API)
                    .build();
        }
        googleApiClient.connect();

＆＃13;

＆＃13;

＆＃13;

这是我项目中的代码（非常类似于api教程中提供的代码：

＆＃13;

＆＃13;

@Override
    public void onConnected(@Nullable Bundle bundle)
    {
        int LOCATION_ALLOWED = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION);
        if (LOCATION_ALLOWED != PackageManager.PERMISSION_GRANTED)
        {
            lastLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
            if (lastLocation != null)
            {
                driverGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude()), 16));
                testHelper.setDriverLatLngLocation(new LatLng(lastLocation.getLatitude(), lastLocation.getLongitude()));

            }
        }
    }

    protected void createLocationRequest()
    {
        locationRequest = new LocationRequest();
        locationRequest.setInterval(1000);
        locationRequest.setFastestInterval(500);
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        LocationSettingsRequest.Builder locationSettingsRequestBuilder = new LocationSettingsRequest.Builder()
                .addLocationRequest(locationRequest);

        PendingResult<LocationSettingsResult> pendingResult = LocationServices
                .SettingsApi
                .checkLocationSettings(googleApiClient, locationSettingsRequestBuilder.build());

        pendingResult.setResultCallback(new ResultCallback<LocationSettingsResult>() {
            @Override
            public void onResult(@NonNull LocationSettingsResult locationSettingsResult)
            {
                Status result = locationSettingsResult.getStatus();
                if (result.getStatusCode() == LocationSettingsStatusCodes.SUCCESS)
                {
                    requestingLocationUpdates = true;
                    startLocationUpdates();
                    Toast.makeText(MainActivity.this, "Gucci", Toast.LENGTH_SHORT).show();
                }

                if (result.getStatusCode() == LocationSettingsStatusCodes.RESOLUTION_REQUIRED)
                {
                    requestingLocationUpdates = false;
                    Toast.makeText(MainActivity.this, "Please enable location services", Toast.LENGTH_SHORT).show();
                }
                if (result.getStatusCode() == LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE)
                {
                    requestingLocationUpdates = false;
                    Toast.makeText(MainActivity.this, "App cannot access settings", Toast.LENGTH_SHORT).show();
                }

            }
        });
    }

    protected void startLocationUpdates()
    {
        int LOCATION_ALLOWED = ContextCompat.checkSelfPermission(getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION);
        if (LOCATION_ALLOWED != PackageManager.PERMISSION_GRANTED)
        {
            LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
        }

    }

    @Override
    public void onConnectionSuspended(int i) {

    }

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

    }

    @Override
    public void onLocationChanged(Location location)
    {
        driverGoogleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()), 16));
        testHelper.setDriverLatLngLocation(new LatLng(location.getLatitude(), location.getLongitude()));
        Toast.makeText(MainActivity.this, "It's working", Toast.LENGTH_SHORT).show();

    }
    protected void stopLocationUpdates()
    {
        LocationServices.FusedLocationApi.removeLocationUpdates(
                googleApiClient, this);
        requestingLocationUpdates = false;
    }

＆＃13;

＆＃13;

＆＃13;

我在这里实例化＆＃34; createLocationRequest：

＆＃13;

＆＃13;

public void onMapReady(GoogleMap googleMap)
    {
        //Setting map starts here
        int LOCATION_ALLOWED = ContextCompat.checkSelfPermission(this.getApplicationContext(), Manifest.permission.ACCESS_COARSE_LOCATION);
        if (LOCATION_ALLOWED == PackageManager.PERMISSION_GRANTED)
        {
            googleMap.setMyLocationEnabled(true);
        }
        createLocationRequest();

＆＃13;

＆＃13;

＆＃13;

＆＃34; createLocationRequest（）＆＃34;的实例化发生在需要它的代码块之前，它是否为空？

我已经查看了多个解决方案，但他们都没有帮助我。我希望也许有人可以帮助我，因为这一直困扰着我并且停止了我的应用程序的开发。