How to Get Current Location

http://www.vogella.com/articles/AndroidLocationAPI/article.html
package com.example.currentlocationdemo;


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

public class MainActivity extends Activity implements LocationListener {
  private TextView latitudeField;
  private TextView longitudeField;
  private LocationManager locationManager;
  private String provider;
  private double latitude,longitude;


/** Called when the activity is first created. */

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    latitudeField = (TextView) findViewById(R.id.latituteField);
    longitudeField = (TextView) findViewById(R.id.longitudeField);

    // Get the location manager
    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    // Define the criteria how to select the locatioin provider -> use
    // default
    Criteria criteria = new Criteria();
    provider = locationManager.getBestProvider(criteria, false);
    Location location = locationManager.getLastKnownLocation(provider);

    // Initialize the location fields
    if (location != null) {
        System.out.println("Provider " + provider + " has been selected.");
       // Toast.makeText(context, text, duration)
        onLocationChanged(location);
    } else {
    latitudeField.setText("Location not available");
      longitudeField.setText("Location not available");
    }
  }

  /* Request updates at startup */
  @Override
  protected void onResume() {
    super.onResume();
    locationManager.requestLocationUpdates(provider, 400, 1, this);
  }

  /* Remove the locationlistener updates when Activity is paused */
  @Override
  protected void onPause() {
    super.onPause();
    locationManager.removeUpdates(this);
  }

  @Override
  public void onLocationChanged(Location location) {
    latitude = (double) (location.getLatitude());
    longitude = (double) (location.getLongitude());
    latitudeField.setText(String.valueOf(latitude));
    longitudeField.setText(String.valueOf(longitude));
  }

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

  }

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

  @Override
  public void onProviderDisabled(String provider) {
    Toast.makeText(this, "Disabled provider " + provider,
        Toast.LENGTH_SHORT).show();
  }
}