MainActivity.java

package net.learn2develop.lbsgps;

import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {
    LocationManager lm;
    LocationListener locationListener;

    private class MyLocationListener implements LocationListener
    {
        @Override
        public void onLocationChanged(Location loc) {
            if (loc != null) {
                Toast.makeText(getBaseContext(),
                        "Location changed : Lat: " + loc.getLatitude() +
                        " Lng: " + loc.getLongitude(),
                        Toast.LENGTH_SHORT).show();
            }
        }

        @Override
        public void onProviderDisabled(String provider) {
            Toast.makeText(getBaseContext(),
                    "Provider: " + provider + " disabled",
                    Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onProviderEnabled(String provider) {
            Toast.makeText(getBaseContext(),
                    "Provider: " + provider + " enabled",
                    Toast.LENGTH_SHORT).show();
        }

        @Override
        public void onStatusChanged(String provider, int status,
                Bundle extras) {
            String statusString = "";            
            switch (status) {
                case android.location.LocationProvider.AVAILABLE:
                    statusString = "available";
                case android.location.LocationProvider.OUT_OF_SERVICE:
                    statusString = "out of service";
                case 
                    android.location.LocationProvider.TEMPORARILY_UNAVAILABLE:
                    statusString = "temporarily unavailable";
            }            
            Toast.makeText(getBaseContext(),
                    provider + " " + statusString,
                    Toast.LENGTH_SHORT).show();          
        }
    }    

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //---use the LocationManager class to obtain locations data---
        lm = (LocationManager)
                getSystemService(Context.LOCATION_SERVICE);
        locationListener = new MyLocationListener();
    }
    
    @Override
    public void onResume() {
        super.onResume();

        //---request for location updates using WiFi and Cellular 
        // triangulations---
        lm.requestLocationUpdates(
                LocationManager.NETWORK_PROVIDER,
                0,
                0,
                locationListener);

    }    

    @Override
    public void onDestroy() {
        super.onDestroy();

        //---remove the location listener---
        lm.removeUpdates(locationListener);
    }

    
}