Android Open Source - NVS G P S Handler

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License

The source code is released under:
Apache License
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Java Source Code

package com.jmuenster.gps;
// w  w w.  j a va2 s  .  c o  m
import java.util.List;

import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.jmuenster.extras.Point;

public class GPSHandler {
  
//  private Context c;
  private LocationManager lm;
  
  public GPSHandler(Context c) {
//    this.c = c;
      lm = (LocationManager) c.getSystemService(Context.LOCATION_SERVICE);
  }
  
  public void checkGPSstatus() {
    
  }
  
  public Point getLastKnownLocation() {
    List<String> providers = lm.getProviders(true);
    Location loc = null;
        for (int i=providers.size()-1; i>=0; i--) {
          loc = lm.getLastKnownLocation(providers.get(i));
            if (loc != null) break;
        }
        GeoPoint geoPoint = new GeoPoint((int)(loc.getLatitude()*1E6), 
            (int)(loc.getLongitude()*1E6));
        
        Point point = new Point(geoPoint, loc.getAltitude());
        
    return point;
  }

  public LocationListener startLocationListener(MapView mv) {
    LocationListener locationListener = new MyLocationListener(mv);
    lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 10000, 30, locationListener);
    // every 35 seconds = 35000
    return locationListener;
  }
  
  public void stopLocationListener(LocationListener locationListener) {
    lm.removeUpdates(locationListener);
  }
  
  /**
   * This getGPS method reads in the application 
   * context and then determines the last known
   * location of the device.
   * 
   * @param c the application context
   * @return an array of doubles with the location information
   */
  @SuppressWarnings("static-access")
  public static double[] getLKGPS(Context c) {  
      LocationManager lm = (LocationManager) c.getSystemService(c.LOCATION_SERVICE);    
      List<String> providers = lm.getProviders(true);  
    
      /* Loop over the array backwards, and if you get an accurate location, then break out the loop*/  
      Location l = null;  
        
      for (int i=providers.size()-1; i>=0; i--) {  
          l = lm.getLastKnownLocation(providers.get(i));  
          if (l != null) break;  
      }  
        
      double[] gps = new double[3];  
      if (l != null) {  
          gps[0] = l.getLatitude();  
          gps[1] = l.getLongitude();
          gps[2] = l.getAltitude();
      }  
      return gps;  
  }

//  public boolean checkGPSonline() {
//      LocationManager lm = (LocationManager) this.getSystemService(MyMapView.LOCATION_SERVICE); 
//    if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){  
//            createGpsDisabledAlert();  
//      }
//    return true;
//  }
//  
//  private void openGPSsettings() {
//    Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
//    startActivityForResult(intent, Constants.REQUEST_CODE);
//  }
//  
//    protected void onActivityResult(int requestCode, int resultCode, Intent data){
//        if(requestCode == Constants.REQUEST_CODE && resultCode == 0){
//          LocationManager lm = (LocationManager) this.getSystemService(MyMapView.LOCATION_SERVICE); 
//        if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)){  
//                createGpsDisabledAlert();
//          }
//        }
//    }
//    
//    private void createGpsDisabledAlert(){  
//      AlertDialog.Builder builder = new AlertDialog.Builder(this);  
//      builder.setMessage("Your GPS is disabled! Would you like to enable it?")  
//           .setCancelable(false)  
//           .setPositiveButton("Enable GPS",  
//                new DialogInterface.OnClickListener(){  
//                public void onClick(DialogInterface dialog, int id){  
//                  openGPSsettings();
//                  dialog.dismiss();
//                }  
//           });  
//           builder.setNegativeButton("Quit Application",  
//                new DialogInterface.OnClickListener(){  
//                public void onClick(DialogInterface dialog, int id){  
//                     quitTheApp();
//                }  
//           });  
//      AlertDialog alert = builder.create();  
//      alert.show();  
//    } 
//    
//    private void quitTheApp() {
//      this.finish();
//    }
}
Java Source Code List
