Get current position with GPS AND WIFI

问题:

I'm currently using GPS only to get current location of the user to return certain results. As in Belgium, if you're inside, most of the time you can't get GPS-connection. So I want to get the current location with the wifi-connection.

I've found this example: get the current location (gps/wifi) But

I'm not sure which lines tell the device which connection to choose. I'm guessing it's this one: String provider = myLocationManager.getBestProvider(criteria,true); That I've to add to my code.

When I check what's inside of this, I always get a null-value, I don't quite understand why.

My code looks currently like this:

public void getOwnLngLat(){
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
final LocationListener locationListener = new LocationListener(){

public void onLocationChanged(Location location) {
    // TODO Auto-generated method stub
    longitude="" + location.getLongitude();
    latitude="" + location.getLatitude();
}

public void onProviderDisabled(String provider) {
    // TODO Auto-generated method stub

}

public void onProviderEnabled(String provider) {
    // TODO Auto-generated method stub

}

public void onStatusChanged(String provider, int status,
                Bundle extras) {
    // TODO Auto-generated method stub

   }        
};
locationManager.requestLocationUpdates(locationManager.getBestProvider(new Criteria(), true), 2000, 10, locationListener);
}

回答1:

you are using locationmanagers getbestprovider method which simply gets any location provider which most closely matches your criteria. if you want to get a specific location provider then use the getProvider method. the parameter should be one of the results of the getProviders method. some links: http://developer.android.com/guide/topics/location/obtaining-user-location.html http://developer.android.com/reference/android/location/LocationManager.html

回答2:

If you want to get updates from a specific provider you can use the requestLocationUpdates (String provider, long minTime, float minDistance, LocationListener listener) method of LocationManager. A list of available providers can be obtained using the getProviders(boolean enabledOnly) method.