Question

i have some code :

manifest

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

activity fields

 private LocationManager locationManager;
 private LocationListener mlocListener;

onCreate initialization

locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
locationManager.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, mlocListener);

class MyLocationListener

    public class MyLocationListener implements LocationListener{

        @Override
        public void onLocationChanged(Location loc){
        }


        @Override

        public void onProviderDisabled(String provider){
            Toast.makeText( getApplicationContext(), "Gps Disabled", Toast.LENGTH_SHORT ).show();
        }

        @Override
        public void onProviderEnabled(String provider){
            Toast.makeText( getApplicationContext(),"Gps Enabled",Toast.LENGTH_SHORT).show();
        }


        @Override

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

    }

and i have button, onclick = getting users gps location

public void getUserLocation(View v){
    boolean enabled = locationManager
            .isProviderEnabled(LocationManager.GPS_PROVIDER);

    if (!enabled) {
          Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
              startActivity(intent);
    } else {
            Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            Toast.makeText(getApplicationContext(), String.valueOf(location.getLatitude()) + " " + String.valueOf(location.getLongitude()), Toast.LENGTH_SHORT).show();
    }
}

on getLastKnownLocation i have error. how can i check that locationManager has getLastKnownLocation ?? requestLocationUpdates automatic has to get location, hasnt it ??

And im interesting, which parametrs in requestLocationUpdates (minTime and minDistance) should better to use ?? i dont want eat users battery too much

Answer 1

how can i check that locationManager has getLastKnownLocation ??

Just a null check will do the required

requestLocationUpdates automatic has to get location, hasnt it ??

As soon you request either from network or from Gps. It start looking for location updates.
but it can take times.

Gps updates are more slower to come. Need open sky but are more accurate.

network update are more faster to come. but are less accurate as compare to GPS.
Incase of wifi network accuracy comes around 50-100 which is good for most of the scnario.

And im interesting, which parametrs in requestLocationUpdates (minTime and minDistance)
should better to use ?? i dont want eat users battery too much

use 0,0
as soon you get a update of desired accuracy unregister from listening location updates.