gps not getting user location
<p>I am trying to get the current user location (latitude and longitude ) but <code>onLocationChanged</code> method is not getting called 
but other methods like public void onProviderDisabled(String provider). Please help, what can be the problem ? 
I have a class:</p>

<pre><code>package com.javacodegeeks.android.lbs;   

import android.app.Activity;   
import android.os.Bundle;   

 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.view.View;     

 import android.view.View.OnClickListener;     

 import android.widget.Button;     

 import android.widget.Toast;     



 public class LbsGeocodingActivity extends Activity {     



     private static final long MINIMUM_DISTANCE_CHANGE_FOR_UPDATES = 1; // in Meters     

     private static final long MINIMUM_TIME_BETWEEN_UPDATES = 1000; // in Milliseconds     



     protected LocationManager locationManager;     



     protected Button retrieveLocationButton;     



     @Override    

     public void onCreate(Bundle savedInstanceState) {     




     super.onCreate(savedInstanceState);     

     setContentView(R.layout.main);     



     retrieveLocationButton = (Button) findViewById(R.id.retrieve_location_button);     



     locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);     



     locationManager.requestLocationUpdates(     

             LocationManager.GPS_PROVIDER,      

             MINIMUM_TIME_BETWEEN_UPDATES,      

             MINIMUM_DISTANCE_CHANGE_FOR_UPDATES,     

             new MyLocationListener()     

     );     



 retrieveLocationButton.setOnClickListener(new OnClickListener() {     

         @Override    

         public void onClick(View v) {     

             showCurrentLocation();     

         }     

 });             



 }         



 protected void showCurrentLocation() {     



     Location location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);     



     if (location != null) {     

         String message = String.format(     

                 "Current Location \n Longitude: %1$s \n Latitude: %2$s",     

                 location.getLongitude(), location.getLatitude()     

         );     

         Toast.makeText(LbsGeocodingActivity.this, message,     

                 Toast.LENGTH_LONG).show();     

     }     



 }        



 private class MyLocationListener implements LocationListener {     



     public void onLocationChanged(Location location) {     

         String message = String.format(     

                 "New Location \n Longitude: %1$s \n Latitude: %2$s",     

                 location.getLongitude(), location.getLatitude()     

         );     

         Toast.makeText(LbsGeocodingActivity.this, message, Toast.LENGTH_LONG).show();     

     }     



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

         Toast.makeText(LbsGeocodingActivity.this, "Provider status changed",     

                 Toast.LENGTH_LONG).show();     

     }     



     public void onProviderDisabled(String s) {     
         Toast.makeText(LbsGeocodingActivity.this,     

                 "Provider disabled by the user. GPS turned off",     

                 Toast.LENGTH_LONG).show();     

     }     



     public void onProviderEnabled(String s) {     

         Toast.makeText(LbsGeocodingActivity.this,     

                 "Provider enabled by the user. GPS turned on",     

                 Toast.LENGTH_LONG).show();     

     }   
 }   
 }  
</code></pre>
