如何在Android中获取当前的GPS位置？

Question

I have problem, I have one button and when I press button -> button.setOnclickListener -> I wil get the current GPS location . But when I don't press button and I want get location when my application is running, it false. I don't understand. This is code for button

btn.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
    // TODO Auto-generated method stub
    getAdd();
}

});

public void getAdd()
{
    Location currentLocation = mLocationClient.getLastLocation();

           Geocoder geocoder = new Geocoder(context, Locale.getDefault());
        //  Location location = params[0];
            List<Address> addresses = null;
            try {
                addresses = geocoder.getFromLocation(currentLocation.getLatitude(),
                        currentLocation.getLongitude(), 1);
            } catch (IOException exception1) {
                exception1.printStackTrace();
            } catch (IllegalArgumentException exception2) {
                exception2.printStackTrace();
            }
            if (addresses != null && addresses.size() > 0) {
                Address address = addresses.get(0);
                String addressText = context.getString(
                        R.string.address_output_string,
                        address.getMaxAddressLineIndex() > 0 ? address
                                .getAddressLine(0) : "",
                        address.getLocality(),
                        address.getCountryName());
                mAddress.setText(addressText);
            }
}

It true. But when i call getAdd() function when my application running. Textview mAddress.setText(addressText) false. If I press button , it will true.what can I do for get my address when application is running first time?

Answer 1

If I got it right, you wan the address to be displayed the first time you run the application, correct? One way to do that is to call the getAdd() function you created in your onCreate() function, in that way, when your application runs, the address will already be displayed in your textView.

Answer 2

public class MyLocationListener implements LocationListener {
        public void onLocationChanged(Location location) {
            mMap.clear();
            if(!mProgress.isShowing())
            {
            mProgress.show();
            }
            LatLng lat=new LatLng(location.getLatitude(), location.getLongitude());
            mopt.position(lat);
            mopt.title("Loading...").snippet("").icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN));
            mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(lat,14.0f));
            myMarker=mMap.addMarker(mopt);
            myMarker.showInfoWindow();

         new ReverseAddress(getBaseContext()).execute(lat);

        }
        public void onStatusChanged(String s, int i, Bundle b) {            
        }
        public void onProviderDisabled(String s) {
        }
        public void onProviderEnabled(String s) {            
        }
    }

Use this method to get the current location also get changed current location. To use this code use

//     Location Manager   
     locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

                    locationManager.requestLocationUpdates(
                                    LocationManager.GPS_PROVIDER, 
                                    MINIMUM_TIME_BETWEEN_UPDATE, 
                                    MINIMUM_DISTANCECHANGE_FOR_UPDATE,
                                    new MyLocationListener()
                    );