Blackberry Storm GPS

gistfile1.java

import java.util.Timer;
import java.util.TimerTask;

import javax.microedition.location.Criteria;
import javax.microedition.location.Location;
import javax.microedition.location.LocationException;
import javax.microedition.location.LocationListener;
import javax.microedition.location.LocationProvider;
import javax.microedition.location.QualifiedCoordinates;

import net.rim.device.api.system.Application;
import net.rim.device.api.system.Bitmap;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.Manager;
import net.rim.device.api.ui.Screen;
import net.rim.device.api.ui.Ui;
import net.rim.device.api.ui.UiEngine;
import net.rim.device.api.ui.component.ButtonField;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.LabelField;
import net.rim.device.api.ui.component.RichTextField;
import net.rim.device.api.ui.container.MainScreen;
import bbtracker.uitl.BBTHTTPClient;

public class BBTMainScreen extends MainScreen {
	public final static String LOCATION_URL = "YOUR SCRIPT LOCATION";

	private RichTextField logField;
	private String log;
	private long lastGPSRead;

	public BBTMainScreen() {
		log = "";
		setTitle(new LabelField("BBTracker GPS Fix", LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH));

		ButtonField btn = new ButtonField("follow logs", ButtonField.CONSUME_CLICK);
		btn.setChangeListener(new ButtonListener());
		this.add(btn);
		
		logField = new RichTextField("asdf");
		this.add(logField);
		
		lastGPSRead = System.currentTimeMillis();
		
		new LocationTracker();
	}
	
	public boolean onClose() {
		Application.getApplication().requestBackground();
		
		return false;
	}
	
	final class ButtonListener implements FieldChangeListener {
		public void fieldChanged(Field field, int context) {
			UiEngine ui = Ui.getUiEngine();
			Screen screen = new Dialog(Dialog.D_OK, BBTMainScreen.this.log, Dialog.OK,
			Bitmap.getPredefinedBitmap(Bitmap.EXCLAMATION), Manager.VERTICAL_SCROLL);
			ui.queueStatus(screen, 1, true);
		}
	}
	
	class LocationTracker extends TimerTask {
		private double longitude, latitude;
		private Timer timer;
		private LocationProvider provider;
		
		public LocationTracker() {
			timer = new Timer();
			
			resetGPS();
			
			timer.schedule(this, 0, 60000);
		}
		
		public void resetGPS() {
			try {
				if(provider != null) {
					provider.setLocationListener(null, 0, 0, 0);
					provider.reset();
					provider = null;
				}
				
				Criteria criteria = new Criteria();
				
				criteria.setHorizontalAccuracy(1000);
				criteria.setVerticalAccuracy(1000);
				criteria.setCostAllowed(false);
			  
//				criteria.setAltitudeRequired(false);
//				criteria.setSpeedAndCourseRequired(false);
//				criteria.setAddressInfoRequired(false);
				criteria.setPreferredPowerConsumption(Criteria.POWER_USAGE_LOW);
				
				provider = LocationProvider.getInstance(criteria);
				provider.setLocationListener(new MyLocationListener(), 10, -1, -1);
				
				// reset the gps counter so we wait another 5 mins before a reset
				lastGPSRead = System.currentTimeMillis();
			} catch(Exception e) { log = e.toString() + log; }
			
			log = "reset gps\n" + log;
		}
		
		public void run() {
			if(log.length() > 3000) {
				log = log.substring(log.length() - 3000);
			}
			
			if(System.currentTimeMillis() - lastGPSRead > 300000) {
				BBTHTTPClient.getPage(LOCATION_URL + "?longitude=-1&latitude=-1");
				resetGPS();
				BBTHTTPClient.getPage(LOCATION_URL + "?longitude=-2&latitude=-2");
			}
			
			log = longitude + "," + latitude + "\n" + log;
			
			BBTMainScreen.this.logField.setText(longitude + "," + latitude + "\n");
			
			log = BBTHTTPClient.getPage(LOCATION_URL + "?longitude=" + longitude + "&latitude=" + latitude).trim() + log;
		}
		
		private class MyLocationListener implements LocationListener {
			public void locationUpdated(LocationProvider provider, Location location)
			{
				if(location != null && location.isValid())
				{
					log = "got valid coords\n" + log;
					
					QualifiedCoordinates qc = location.getQualifiedCoordinates();

					try {
						// TODO: not thread safe (assignment should be done at one time)
						LocationTracker.this.longitude = qc.getLongitude();
						LocationTracker.this.latitude = qc.getLatitude();
						
						lastGPSRead = System.currentTimeMillis();
					} catch(Exception e) { log = e.toString() + log; }
				}
				else
				{
					log = "location is not valid..\n" + log;
				}
			}

			public void providerStateChanged(LocationProvider provider, int newState) {
				// TODO: if provider was disabled, then disable reporting
				log = "state changed: " + newState + "\n" + log;
				
				LocationTracker.this.resetGPS();
				
//				try {
//					provider.setLocationListener(null, 0, 0, 0);
//					provider.reset();
//					provider = null;
//					provider = LocationProvider.getInstance(new Criteria());
//					provider.setLocationListener(new MyLocationListener(), 10, -1, -1);
//				} catch(Exception e) { log = e.toString() + log; }
			}
		}
	}
}