getLastKnownLocation returns null

user_2724715 0
Viewed 88515

I've read some questions about this, but I didn't quite find an answer that I needed.

So, the case is that I have my map set up, and I want to grab my current gps location. I have checked that my variables is not NULL but yet my result from:

getLastKnownLocation(provider, false);

Gives me null though, so this is where I need help. I have added permissions for COARSE + FINE location. But I usually have all kinds of network data disabled for my phone, because I'm not very happy about unpredictable dataflow expenses in my phone bill. So I have only WiFi enabled and connected for this test.

Is there anything more I NEED to enable in order for this to be possible? I would think WiFi should be sufficient?

location google-maps android
9 Answers

Try this it works good for me :-

LocationManager mLocationManager;
Location myLocation = getLastKnownLocation();

        private Location getLastKnownLocation() {
            Location oldLoc;
            while (true){
                oldLoc = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                if (oldLoc == null){
                    continue;
                }
                else {
                    break;
                }
            }
            return oldLoc;
        }

You can use NETWORK_PROVIDER in place of GPS_PROVIDER for faster results..

user_94094600 
private void getLastLocation()
{
    LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);


    LocationListener locationListener = new LocationListener() {
        public void onLocationChanged(Location location) {
            Log.e("location",location.getLatitude()+"");

        }

        public void onStatusChanged(String provider, int status, Bundle extras) {}

        public void onProviderEnabled(String provider) {}

        public void onProviderDisabled(String provider) {}
    };

    locationManager.requestSingleUpdate(LocationManager.NETWORK_PROVIDER,locationListener,null);

}

// This will help you for fetching location after gps enable

locationManager.requestSingleUpdate(LocationManager.NETWORK_PROVIDER,locationListener,null);

user_31642270

I had this problem in Xamarin.Android.

Location location = locationManager.GetLastKnownLocation(provider); was returning null value. I checked my code and got to know that I had just requested permission for ACCESS_COARSE_LOCATION. I added code to request permission for ACCESS_FINE_LOCATION and now it was not returning null. Here is my code:

void AskPermissions()
{
    if (CheckSelfPermission(Manifest.Permission.AccessCoarseLocation) != (int)Permission.Granted ||
            CheckSelfPermission(Manifest.Permission.AccessFineLocation) != (int)Permission.Granted)
        RequestPermissions(new string[] { Manifest.Permission.AccessCoarseLocation, Manifest.Permission.AccessFineLocation }, 0);
    else
        GetLocation();
}

public override void OnRequestPermissionsResult(int requestCode, string[] permissions, [GeneratedEnum] Android.Content.PM.Permission[] grantResults)
{
    if (CheckSelfPermission(Manifest.Permission.AccessCoarseLocation) == (int)Permission.Granted &&
            CheckSelfPermission(Manifest.Permission.AccessFineLocation) == (int)Permission.Granted)
        GetLocation();
    else
        Log.Info(tag, "Permission not Granted: Please enter desired Location manually.");
}

void GetLocation()
{
    locationManager = (LocationManager)GetSystemService(LocationService);
    provider = locationManager.GetBestProvider(new Criteria(), false);
    Location location = locationManager.GetLastKnownLocation(provider);
    if (location != null)
        Log.Info(tag, "Location Lat: " + location.Latitude + " Lon: " + location.Longitude);
    else
        Log.Info(tag, "Location is null");
}

In case anyone coming from Xamarin.Android (C#) would find it useful. For Java or Android Studio the code would be similar withs some minor Syntax changes like GetLastKnownLocation() will be getLastKnownLocation() as method names in Java start with lowercase letters while in C# method names start with Uppercase letters.

user_83041760

I liked this solution to update location:

Update location

In resume, add the condition:

Location myLocation = getLastKnownLocation();
if (myLocation == null) {
      locationManager.requestLocationUpdates(
      LocationManager.PASSIVE_PROVIDER,
      MIN_TIME_BW_UPDATES,
      MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
      Log.d("GPS", "GPS Enabled");
 }

And maybe is some basic, but check that GPS is ON.

user_87108840
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