How to get current location in android 7?

I'm trying to get current location in android and its OK when i'm using on android M or lower, But when i run my application on android N, location is null and when i want get latitude from it will returns 0. here is my code

 try {

            if (!isGPSEnabled && !isNetworkEnabled) {
             } else {
                this.canGetLocation = true;
                 if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }
                 if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

and its OK when i'm using on android M or lower

No, it is not. getLastKnownLocation() frequently returns null, on all versions of Android.

getLastKnownLocation() is an optimization. Use it, but be prepared to rely upon onLocationChanged() for when getLastKnownLocation() returns null or an out-of-date value.

This is covered in the documentation, as well as in books and courses on Android app development.