An application for using an external bluetooth GPS on Android devices.BlueGPS4Droid_1.2.0BlueGPS4Droid_1.0

The application starts a service, then connects to a Bluetooth device (NMEA GPS) and creates a mock GPS provider which can be used to replace the internal GPS.
It's also possible to log the external GPS NMEA data in a file on the device.

4 files changed, 1252 insertions, 0 deletions

diff --git a/src/org/broeuschmeul/android/gps/bluetooth/provider/BlueetoothGpsManager.java b/src/org/broeuschmeul/android/gps/bluetooth/provider/BlueetoothGpsManager.java
new file mode 100644
index 0000000..bd9464d
--- /dev/null
+++ b/src/org/broeuschmeul/android/gps/bluetooth/provider/BlueetoothGpsManager.java
@@ -0,0 +1,321 @@
+/*

+ * Copyright (C) 2010 Herbert von Broeuschmeul

+ * Copyright (C) 2010 BluetoothGPS4Droid Project

+ * 

+ * This file is part of BluetoothGPS4Droid.

+ *

+ * BluetoothGPS4Droid is free software: you can redistribute it and/or modify

+ * it under the terms of the GNU General Public License as published by

+ * the Free Software Foundation, either version 3 of the License, or

+ * (at your option) any later version.

+ * 

+ * BluetoothGPS4Droid is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU General Public License for more details.

+ * 

+ *  You should have received a copy of the GNU General Public License

+ *  along with BluetoothGPS4Droid. If not, see <http://www.gnu.org/licenses/>.

+ */

+

+package org.broeuschmeul.android.gps.bluetooth.provider;

+

+import java.io.BufferedReader;

+import java.io.IOException;

+import java.io.InputStream;

+import java.io.InputStreamReader;

+import java.io.OutputStream;

+import java.io.PrintStream;

+import java.util.Collections;

+import java.util.LinkedList;

+import java.util.List;

+import java.util.Locale;

+import java.util.UUID;

+import java.util.concurrent.ExecutorService;

+import java.util.concurrent.Executors;

+

+import org.broeuschmeul.android.gps.nmea.util.NmeaParser;

+

+import android.app.Service;

+import android.bluetooth.BluetoothAdapter;

+import android.bluetooth.BluetoothDevice;

+import android.bluetooth.BluetoothSocket;

+import android.content.Context;

+import android.location.Criteria;

+import android.location.LocationManager;

+import android.location.LocationProvider;

+import android.location.GpsStatus.NmeaListener;

+import android.util.Log;

+import android.util.PrintStreamPrinter;

+

+public class BlueetoothGpsManager {

+

+	private class ConnectedThread extends Thread {

+		    private final InputStream in;

+		    private final OutputStream out;

+		    private final PrintStream out2;

+	

+		    public ConnectedThread(BluetoothSocket socket) {

+		        InputStream tmpIn = null;

+		        OutputStream tmpOut = null;

+		        PrintStream tmpOut2 = null;

+		        try {

+		        	tmpIn = socket.getInputStream();

+		        	tmpOut = socket.getOutputStream();

+		        	if (tmpOut != null){

+		        		tmpOut2 = new PrintStream(tmpOut, false, "US-ASCII");

+		        	}

+		        } catch (IOException e) {

+		        	Log.e("BT test", "error while getting socket streams", e);

+		        }	

+		        in = tmpIn;

+		        out = tmpOut;

+		        out2 = tmpOut2;

+		    }

+	

+		    public void run() {

+		        try {

+		        	BufferedReader reader = new BufferedReader(new InputStreamReader(in,"US-ASCII"));

+		        	String s;

+					while((enabled && (s = reader.readLine()) != null)){

+						Log.e("BT test", "data: "+System.currentTimeMillis()+" "+s + "xxx");

+						notifyNmeaSentence(s+"\r\n");

+//						parser.parseNmeaSentence(s);

+//	//					writer.println(s);

+//						addNMEAString(s);

+//						nmeaSentenceHandler.ob

+					}

+				} catch (IOException e) {

+		        	Log.e("BT test", "error while getting data", e);

+				} finally {

+					disable();

+				}

+		    }

+

+	        /**

+	         * Write to the connected OutStream.

+	         * @param buffer  The bytes to write

+	         */

+	        public void write(byte[] buffer) {

+	            try {

+	                out.write(buffer);

+	            } catch (IOException e) {

+//	                Log.e(TAG, "Exception during write", e);

+	            }

+	        }

+	        /**

+	         * Write to the connected OutStream.

+	         * @param buffer  The data to write

+	         */

+	        public void write(String buffer) {

+	            try {

+	                out2.print(buffer);

+	                out.flush();

+	            } catch (IOException e) {

+//	                Log.e(TAG, "Exception during write", e);

+	            }

+	        }

+		}

+

+	private Service callingService;

+	private BluetoothDevice gpsDevice;

+	private BluetoothSocket gpsSocket;

+	private String gpsDeviceAddress;

+	private NmeaParser parser = new NmeaParser(10f);

+	private boolean enabled = false;

+	private ExecutorService notificationPool;

+	private List<NmeaListener> nmeaListeners = Collections.synchronizedList(new LinkedList<NmeaListener>()); 

+	private LocationManager locationManager;

+//	private boolean mockGpsEnabled = true;

+//	private String mockLocationProvider = LocationManager.GPS_PROVIDER;

+	private ConnectedThread connectedThread;

+

+//	private Handler nmeaSentenceHandler = new Handler();

+

+	

+	/**

+	 * @return true if the bluetooth GPS is enabled

+	 */

+	public boolean isEnabled() {

+		return enabled;

+	}

+

+	public BlueetoothGpsManager(Service callingService, String deviceAddress) {

+		this.gpsDeviceAddress = deviceAddress;

+		this.callingService = callingService;

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

+		parser.setLocationManager(locationManager);	

+	}

+

+	public synchronized void enable() {

+		if (! enabled){

+			this.enabled = true;

+			final BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

+	        if (bluetoothAdapter == null) {

+	            // Device does not support Bluetooth

+	        	Log.e("BT test", "Device does not support Bluetooth");

+	        } else if (!bluetoothAdapter.isEnabled()) {

+//	        	    Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);

+//	        	    startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);

+	        	Log.e("BT test", "Bluetooth is not enabled");

+	        } else {

+	    		BluetoothDevice gpsDevice = bluetoothAdapter.getRemoteDevice(gpsDeviceAddress);

+	    		if (gpsDevice == null){

+	    			Log.e("BT test", "GPS device not found");       	    	

+	    		} else {

+	    			Log.e("BT test", "current device: "+gpsDevice.getName() + " -- " + gpsDevice.getAddress());

+	    			try {

+	    				gpsSocket = gpsDevice.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));

+	    			} catch (IOException e) {

+	    				Log.e("BT test", "Error during connection", e);

+	    			}

+	    			if (gpsSocket == null){

+	    				Log.e("BT test", "Error while establishing connection: no socket");

+	    			} else {

+////	    				mockGpsEnabled = locationManager.isProviderEnabled(mockLocationProvider);

+//	    				LocationProvider prov = locationManager.getProvider(mockLocationProvider);

+//	    				Log.e("BT test", "Mock power: "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+locationManager.isProviderEnabled(mockLocationProvider));

+//	    				locationManager.addTestProvider(mockLocationProvider, false, true,false, false, 

+//	    						true, true, true, Criteria.POWER_HIGH, Criteria.ACCURACY_FINE);

+////	    				locationManager.setTestProviderEnabled(mockLocationProvider, true);

+//	    				prov = locationManager.getProvider(mockLocationProvider);

+//	    				Log.e("BT test", "Mock power: "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+locationManager.isProviderEnabled(mockLocationProvider));

+

+	    				Runnable connectThread = new Runnable() {							

+							@Override

+							public void run() {

+								// Cancel discovery because it will slow down the connection

+								bluetoothAdapter.cancelDiscovery();

+						        try {

+						            // Connect the device through the socket. This will block

+						            // until it succeeds or throws an exception

+						        	gpsSocket.connect();

+				    				connectedThread = new ConnectedThread(gpsSocket);

+				    				connectedThread.start();

+//				    				String command = callingService.getString(R.string.sirf_gll_on);

+//				    				String sentence = String.format((Locale)null,"$%s*%X\r\n", command, parser.computeChecksum(command)); 

+//				    				String command1 = callingService.getString(R.string.sirf_gll_off);

+//				    				String sentence1 = String.format((Locale)null,"$%s*%X\r\n", command1, parser.computeChecksum(command1)); 

+//				    				String command2 = callingService.getString(R.string.sirf_vtg_off);

+//				    				String sentence2 = String.format((Locale)null,"$%s*%X\r\n", command2, parser.computeChecksum(command2)); 

+//				    				try {

+//										Thread.sleep(5000);

+//									} catch (InterruptedException e) {

+//										// TODO Auto-generated catch block

+//										e.printStackTrace();

+//									}

+//				    				Log.e("BT test", "sending NMEA sentence: "+"$PSRF105,1*3E\r\n");

+//				    				connectedThread.write("$PSRF105,1*3E\r\n");	    								    				

+//				    				Log.e("BT test", "sending NMEA sentence: "+sentence1);

+//				    				connectedThread.write(sentence1);	    								    				

+//				    				Log.e("BT test", "sending NMEA sentence: "+sentence2);

+//				    				connectedThread.write(sentence2);	    								    				

+						        } catch (IOException connectException) {

+						            // Unable to connect; close everything and get out

+						        	Log.e("BT test", "error while connecting to socket", connectException);

+									disable();

+//						        	callingService.stopSelf();

+						        }

+							}

+						};

+						notificationPool = Executors.newSingleThreadExecutor();

+						notificationPool.execute(connectThread);

+//						enableMockLocationProvider(LocationManager.GPS_PROVIDER);

+	    			}

+	    		}

+	        }

+		}

+	}

+	

+	public synchronized void disable() {

+		if (enabled){

+			enabled = false;

+			if (gpsSocket != null){

+		    	try {

+		    		gpsSocket.close();

+		    	} catch (IOException closeException) {

+		    		Log.e("BT test", "error while closing socket", closeException);

+		    	}

+			}

+			nmeaListeners.clear();

+			disableMockLocationProvider();

+			notificationPool.shutdown();

+////			locationManager.setTestProviderEnabled(mockLocationProvider, mockGpsEnabled);

+//			LocationProvider prov = locationManager.getProvider(mockLocationProvider);

+//			Log.e("BT test", "Mock power: "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+locationManager.isProviderEnabled(mockLocationProvider));

+//			locationManager.clearTestProviderEnabled(mockLocationProvider);

+//			prov = locationManager.getProvider(mockLocationProvider);

+//			Log.e("BT test", "Mock power: "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+locationManager.isProviderEnabled(mockLocationProvider));

+//			locationManager.clearTestProviderStatus(mockLocationProvider);

+//			locationManager.removeTestProvider(mockLocationProvider);

+//			prov = locationManager.getProvider(mockLocationProvider);

+//			Log.e("BT test", "Mock power: "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+locationManager.isProviderEnabled(mockLocationProvider));

+//			Log.e("BT test", "removed mock GPS");

+			

+			callingService.stopSelf();

+		}

+	}

+

+	

+	public void enableMockLocationProvider(String gpsName){

+		if (parser != null){

+			parser.enableMockLocationProvider(gpsName);

+		}

+	}

+	

+	public void disableMockLocationProvider(){

+		if (parser != null){

+			parser.disableMockLocationProvider();

+		}

+	}

+

+	/**

+	 * @return the mockGpsEnabled

+	 */

+	public boolean isMockGpsEnabled() {

+		boolean mockGpsEnabled = false;

+		if (parser != null){

+			mockGpsEnabled = parser.isMockGpsEnabled();

+		}

+		return mockGpsEnabled;

+	}

+	/**

+	 * @return the mockLocationProvider

+	 */

+	public String getMockLocationProvider() {

+		String  mockLocationProvider = null;

+		if (parser != null){

+			mockLocationProvider = parser.getMockLocationProvider();

+		}

+		return mockLocationProvider;

+	}

+	

+

+	public boolean addNmeaListener(NmeaListener listener){

+		if (!nmeaListeners.contains(listener)){

+			nmeaListeners.add(listener);

+		}

+		return true;

+	}

+	

+	public void removeNmeaListener(NmeaListener listener){

+			nmeaListeners.remove(listener);

+	}

+	

+	private void notifyNmeaSentence(final String nmeaSentence){

+		if (enabled){

+			parser.parseNmeaSentence(nmeaSentence);

+			final long timestamp = System.currentTimeMillis();

+			synchronized(nmeaListeners) {

+				for(final NmeaListener listener : nmeaListeners){

+					notificationPool.execute(new Runnable(){

+						@Override

+						public void run() {

+							listener.onNmeaReceived(timestamp, nmeaSentence);

+						}					 

+					});

+				}

+			}

+		}

+	}		

+}

diff --git a/src/org/broeuschmeul/android/gps/bluetooth/provider/BluetoothGpsActivity.java b/src/org/broeuschmeul/android/gps/bluetooth/provider/BluetoothGpsActivity.java
new file mode 100644
index 0000000..8ce8e62
--- /dev/null
+++ b/src/org/broeuschmeul/android/gps/bluetooth/provider/BluetoothGpsActivity.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright (C) 2010 Herbert von Broeuschmeul
+ * Copyright (C) 2010 BluetoothGPS4Droid Project
+ * 
+ * This file is part of BluetoothGPS4Droid.
+ *
+ * BluetoothGPS4Droid is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * BluetoothGPS4Droid is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ *  You should have received a copy of the GNU General Public License
+ *  along with BluetoothGPS4Droid. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.broeuschmeul.android.gps.bluetooth.provider;
+
+import java.util.Set;
+import java.util.prefs.Preferences;
+import java.util.zip.CheckedInputStream;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
+import android.os.Bundle;
+import android.preference.CheckBoxPreference;
+import android.preference.ListPreference;
+import android.preference.Preference;
+import android.preference.PreferenceActivity;
+import android.preference.PreferenceManager;
+import android.preference.PreferenceScreen;
+import android.preference.Preference.OnPreferenceChangeListener;
+import android.util.Log;
+
+/**
+ * A PreferenceActivity Class used to configure, start and stop the NMEA tracker service.
+ * 
+ * @author Herbert von Broeuschmeul
+ *
+ */
+public class BluetoothGpsActivity extends PreferenceActivity implements OnPreferenceChangeListener, OnSharedPreferenceChangeListener {
+	private SharedPreferences sharedPref ;
+	private BluetoothAdapter bluetoothAdapter = null;
+	
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        addPreferencesFromResource(R.xml.pref);      
+        sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
+        sharedPref.registerOnSharedPreferenceChangeListener(this);
+        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+   }
+
+    /* (non-Javadoc)
+	 * @see android.app.Activity#onResume()
+	 */
+	@Override
+	protected void onResume() {
+		this.updateDevicePreferenceList();
+		super.onResume();
+	}
+
+	private void updateDevicePreferenceSummary(){
+        // update bluetooth device summary
+		String deviceName = "";
+        ListPreference prefDevices = (ListPreference)findPreference(BluetoothGpsProviderService.PREF_BLUETOOTH_DEVICE);
+        String deviceAddress = sharedPref.getString(BluetoothGpsProviderService.PREF_BLUETOOTH_DEVICE, null);
+        if (BluetoothAdapter.checkBluetoothAddress(deviceAddress)){
+        	deviceName = bluetoothAdapter.getRemoteDevice(deviceAddress).getName();
+        }
+        prefDevices.setSummary(getString(R.string.pref_bluetooth_device_summary, deviceName));
+    }   
+
+	private void updateDevicePreferenceList(){
+        // update bluetooth device summary
+		updateDevicePreferenceSummary();
+		// update bluetooth device list
+        ListPreference prefDevices = (ListPreference)findPreference(BluetoothGpsProviderService.PREF_BLUETOOTH_DEVICE);
+        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();        
+        String[] entryValues = new String[pairedDevices.size()];
+        String[] entries = new String[pairedDevices.size()];
+        int i = 0;
+    	    // Loop through paired devices
+        for (BluetoothDevice device : pairedDevices) {
+        	// Add the name and address to the ListPreference enties and entyValues
+        	Log.e("BT test", "device: "+device.getName() + " -- " + device.getAddress());
+        	entryValues[i] = device.getAddress();
+            entries[i] = device.getName();
+            i++;
+        }
+        prefDevices.setEntryValues(entryValues);
+        prefDevices.setEntries(entries);
+    }
+    
+	@Override
+	protected void onDestroy() {
+		super.onDestroy();
+		sharedPref.unregisterOnSharedPreferenceChangeListener(this);
+	}
+
+	@Override
+	public boolean onPreferenceChange(Preference preference, Object newValue) {
+		// TODO Auto-generated method stub
+		return false;
+	}
+
+	@Override
+	public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
+			String key) {
+		if (BluetoothGpsProviderService.PREF_START_GPS_PROVIDER.equals(key)){
+			boolean val = false;
+			if (val = sharedPreferences.getBoolean(key, false)){
+		        startService(new Intent(BluetoothGpsProviderService.ACTION_START_GPS_PROVIDER));
+			} else {
+				startService(new Intent(BluetoothGpsProviderService.ACTION_STOP_GPS_PROVIDER));
+			}
+			CheckBoxPreference pref = (CheckBoxPreference)findPreference(key);
+			if (pref.isChecked() != val){
+				pref.setChecked(val);
+			}
+		} else if (BluetoothGpsProviderService.PREF_TRACK_RECORDING.equals(key)){
+			boolean val = false;
+			if (val = sharedPreferences.getBoolean(key, false)){
+		        startService(new Intent(BluetoothGpsProviderService.ACTION_START_TRACK_RECORDING));
+			} else {
+				startService(new Intent(BluetoothGpsProviderService.ACTION_STOP_TRACK_RECORDING));
+			}
+			CheckBoxPreference pref = (CheckBoxPreference)findPreference(key);
+			if (pref.isChecked() != val){
+				pref.setChecked(val);
+			}
+		} else if (BluetoothGpsProviderService.PREF_BLUETOOTH_DEVICE.equals(key)){
+			updateDevicePreferenceSummary();
+		}	
+	}	
+}
\ No newline at end of file
diff --git a/src/org/broeuschmeul/android/gps/bluetooth/provider/BluetoothGpsProviderService.java b/src/org/broeuschmeul/android/gps/bluetooth/provider/BluetoothGpsProviderService.java
new file mode 100644
index 0000000..0ab972b
--- /dev/null
+++ b/src/org/broeuschmeul/android/gps/bluetooth/provider/BluetoothGpsProviderService.java
@@ -0,0 +1,304 @@
+/*

+ * Copyright (C) 2010 Herbert von Broeuschmeul

+ * Copyright (C) 2010 BluetoothGPS4Droid Project

+ * 

+ * This file is part of BluetoothGPS4Droid.

+ *

+ * BluetoothGPS4Droid is free software: you can redistribute it and/or modify

+ * it under the terms of the GNU General Public License as published by

+ * the Free Software Foundation, either version 3 of the License, or

+ * (at your option) any later version.

+ * 

+ * BluetoothGPS4Droid is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU General Public License for more details.

+ * 

+ *  You should have received a copy of the GNU General Public License

+ *  along with BluetoothGPS4Droid. If not, see <http://www.gnu.org/licenses/>.

+ */

+

+/**

+ * 

+ */

+package org.broeuschmeul.android.gps.bluetooth.provider;

+

+import java.io.BufferedWriter;

+import java.io.File;

+import java.io.FileWriter;

+import java.io.IOException;

+import java.io.PrintWriter;

+import java.text.SimpleDateFormat;

+import java.util.Date;

+

+import android.app.Notification;

+import android.app.PendingIntent;

+import android.app.Service;

+import android.bluetooth.BluetoothAdapter;

+import android.content.Context;

+import android.content.Intent;

+import android.content.SharedPreferences;

+import android.location.Location;

+import android.location.LocationListener;

+import android.location.LocationManager;

+import android.location.GpsStatus.NmeaListener;

+import android.os.Bundle;

+import android.os.IBinder;

+import android.preference.PreferenceManager;

+import android.util.Config;

+import android.util.Log;

+import android.widget.Toast;

+

+/**

+ * A Service used to replace Android internal GPS with a bluetooth GPS and/or write GPS NMEA data in a File.

+ * 

+ * @author Herbert von Broeuschmeul

+ *

+ */

+public class BluetoothGpsProviderService extends Service implements NmeaListener, LocationListener {

+	

+	public static final String ACTION_START_TRACK_RECORDING = "org.broeuschmeul.android.gps.bluetooth.tracker.nmea.intent.action.START_TRACK_RECORDING";

+	public static final String ACTION_STOP_TRACK_RECORDING = "org.broeuschmeul.android.gps.bluetooth.tracker.nmea.intent.action.STOP_TRACK_RECORDING";

+	public static final String ACTION_START_GPS_PROVIDER = "org.broeuschmeul.android.gps.bluetooth.provider.nmea.intent.action.START_GPS_PROVIDER";

+	public static final String ACTION_STOP_GPS_PROVIDER = "org.broeuschmeul.android.gps.bluetooth.provider.nmea.intent.action.STOP_GPS_PROVIDER";

+	public static final String PREF_START_GPS_PROVIDER = "startGps";

+	public static final String PREF_TRACK_RECORDING = "trackRecording";

+	public static final String PREF_TRACK_MIN_DISTANCE = "trackMinDistance";

+	public static final String PREF_TRACK_MIN_TIME = "trackMinTime";

+	public static final String PREF_TRACK_FILE_DIR = "trackFileDirectory";

+	public static final String PREF_TRACK_FILE_PREFIX = "trackFilePrefix";

+	public static final String PREF_BLUETOOTH_DEVICE = "bluetoothDevice";

+

+	private LocationManager lm;

+    private BlueetoothGpsManager gpsManager = null;

+	private PrintWriter writer;

+	private File trackFile;

+	private boolean preludeWritten = false;

+	private Toast toast ;

+	

+	@Override

+	public void onCreate() {

+		super.onCreate();

+	    toast = Toast.makeText(getApplicationContext(), "NMEA track recording... on", Toast.LENGTH_SHORT);		

+        lm = (LocationManager)this.getSystemService(Context.LOCATION_SERVICE);

+	}

+

+	@Override

+	public void onStart(Intent intent, int startId) {

+//		super.onStart(intent, startId);

+		SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);

+		SharedPreferences.Editor edit = sharedPreferences.edit();

+//		long minTime = Long.parseLong(sharedPreferences.getString(PREF_TRACK_MIN_TIME, this.getString(R.string.defaultTrackMinTime)));

+//		float minDistance = Float.parseFloat(sharedPreferences.getString(PREF_TRACK_MIN_DISTANCE, this.getString(R.string.defaultTrackMinDistance)));

+		String deviceAddress = sharedPreferences.getString(PREF_BLUETOOTH_DEVICE, null);

+		if (Config.LOGD){

+//			Log.d(BluetoothGpsProviderService.class.getName(), "prefs minTime: "+minTime);

+//			Log.d(BluetoothGpsProviderService.class.getName(), "prefs minDistance: "+minDistance);

+			Log.d(BluetoothGpsProviderService.class.getName(), "prefs device addr: "+deviceAddress);

+		}

+		if (ACTION_START_GPS_PROVIDER.equals(intent.getAction())){

+			if (gpsManager == null){

+				Notification notification = new Notification(R.drawable.icon, this.getString(R.string.foreground_gps_provider_started_notification),  System.currentTimeMillis());

+				Intent myIntent = new Intent(this, BluetoothGpsActivity.class);

+				PendingIntent myPendingIntent = PendingIntent.getActivity(this, 0, myIntent, PendingIntent.FLAG_CANCEL_CURRENT);

+				notification.setLatestEventInfo(getApplicationContext(), this.getString(R.string.foreground_service_started_notification_title), this.getString(R.string.foreground_gps_provider_started_notification), myPendingIntent);

+				startForeground(R.string.foreground_gps_provider_started_notification, notification);

+				if (BluetoothAdapter.checkBluetoothAddress(deviceAddress)){

+					gpsManager = new BlueetoothGpsManager(this, deviceAddress);

+					gpsManager.enableMockLocationProvider(LocationManager.GPS_PROVIDER);

+					gpsManager.enable();

+					if (! sharedPreferences.getBoolean(PREF_START_GPS_PROVIDER, false)){

+						edit.putBoolean(PREF_START_GPS_PROVIDER,true);

+						edit.commit();

+					}

+					toast.setText(this.getString(R.string.msg_gps_provider_started));

+					toast.show();				

+				} else {

+//					if (! sharedPreferences.getBoolean(PREF_START_GPS_PROVIDER, true)){

+//						edit.putBoolean(PREF_START_GPS_PROVIDER,false);

+//						edit.commit();

+//					}

+//					toast.setText(this.getString(R.string.msg_invalid_device));

+//					toast.show();				

+					stopSelf();

+				}

+			} else {

+				toast.setText(this.getString(R.string.msg_gps_provider_already_started));

+				toast.show();

+			}

+		} else if (ACTION_START_TRACK_RECORDING.equals(intent.getAction())){

+			if (trackFile == null){

+				if (gpsManager != null){

+					beginTrack();

+					gpsManager.addNmeaListener(this);

+					if (! sharedPreferences.getBoolean(PREF_TRACK_RECORDING, false)){

+						edit.putBoolean(PREF_TRACK_RECORDING,true);

+						edit.commit();

+					}

+					toast.setText(this.getString(R.string.msg_nmea_recording_started));

+					toast.show();				

+				} else {

+					endTrack();

+					if ( sharedPreferences.getBoolean(PREF_TRACK_RECORDING, true)){

+						edit.putBoolean(PREF_TRACK_RECORDING,false);

+						edit.commit();

+					}

+//					toast.setText(this.getString(R.string.msg_device_not_started));

+//					toast.show();				

+				}

+			} else {

+				toast.setText(this.getString(R.string.msg_nmea_recording_already_started));

+				toast.show();

+			}

+		} else if (ACTION_STOP_TRACK_RECORDING.equals(intent.getAction())){

+			if (gpsManager != null){

+				gpsManager.removeNmeaListener(this);

+				endTrack();

+				toast.setText(this.getString(R.string.msg_nmea_recording_stopped));

+				toast.show();

+			}

+			if (sharedPreferences.getBoolean(PREF_TRACK_RECORDING, true)){

+				edit.putBoolean(PREF_TRACK_RECORDING,false);

+				edit.commit();

+			}

+		} else if (ACTION_STOP_GPS_PROVIDER.equals(intent.getAction())){

+			if (sharedPreferences.getBoolean(PREF_START_GPS_PROVIDER, true)){

+				edit.putBoolean(PREF_START_GPS_PROVIDER,false);

+				edit.commit();

+			}

+			stopSelf();

+		}

+	}

+

+	/* (non-Javadoc)

+	 * @see android.app.Service#onStartCommand(android.content.Intent, int, int)

+	 */

+	@Override

+	public int onStartCommand(Intent intent, int flags, int startId) {

+		onStart(intent, startId);

+		return Service.START_NOT_STICKY;

+	}

+

+	@Override

+	public void onDestroy() {

+		BlueetoothGpsManager manager = gpsManager;

+		gpsManager  = null;

+		if (manager != null){

+			manager.removeNmeaListener(this);

+			manager.disableMockLocationProvider();

+			manager.disable();

+		}

+		endTrack();

+		SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);

+		SharedPreferences.Editor edit = sharedPreferences.edit();

+		if (sharedPreferences.getBoolean(PREF_TRACK_RECORDING, true)){

+			edit.putBoolean(PREF_TRACK_RECORDING,false);

+			edit.commit();

+		}

+		if (sharedPreferences.getBoolean(PREF_START_GPS_PROVIDER, true)){

+			edit.putBoolean(PREF_START_GPS_PROVIDER,false);

+			edit.commit();

+		}

+//		toast.setText(this.getString(R.string.msg_nmea_recording_stopped));

+//		toast.show();

+		toast.setText(this.getString(R.string.msg_gps_provider_stopped));

+		toast.show();

+		super.onDestroy();

+	}

+

+	private void beginTrack(){

+		SimpleDateFormat fmt = new SimpleDateFormat("_yyyy-MM-dd_HH-mm-ss'.nmea'");

+		SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);

+		String trackDirName = sharedPreferences.getString(PREF_TRACK_FILE_DIR, this.getString(R.string.defaultTrackFileDirectory));

+		String trackFilePrefix = sharedPreferences.getString(PREF_TRACK_FILE_PREFIX, this.getString(R.string.defaultTrackFilePrefix));

+		trackFile = new File(trackDirName,trackFilePrefix+fmt.format(new Date()));

+		Log.i(BluetoothGpsProviderService.class.getName(), "Writing the prelude of the NMEA file: "+trackFile.getAbsolutePath());

+		File trackDir = trackFile.getParentFile();

+		try {

+			if ((! trackDir.mkdirs()) && (! trackDir.isDirectory())){

+				Log.e(BluetoothGpsProviderService.class.getName(), "Error while creating parent dir of NMEA file: "+trackDir.getAbsolutePath());

+			}

+			writer = new PrintWriter(new BufferedWriter(new FileWriter(trackFile)));

+			preludeWritten = true;

+		} catch (IOException e) {

+			Log.e(BluetoothGpsProviderService.class.getName(), "Error while writing the prelude of the NMEA file: "+trackFile.getAbsolutePath(), e);

+			// there was an error while writing the prelude of the NMEA file, stopping the service...

+			stopSelf();

+//		} catch (SecurityException e) {

+//			Log.e(BluetoothGpsProviderService.class.getName(), "Error while writing the prelude of the NMEA file: "+trackFile.getAbsolutePath(), e);

+//			// there was an error while writing the prelude of the NMEA file, stopping the service...

+//			stopSelf();

+		}

+	}

+	private void endTrack(){

+		if (trackFile != null && writer != null){

+			Log.i(BluetoothGpsProviderService.class.getName(), "Ending the NMEA file: "+trackFile.getAbsolutePath());

+			preludeWritten = false;

+			writer.close();

+			trackFile = null;

+		}

+	}

+	private void addNMEAString(String data){

+		if (! preludeWritten){

+			beginTrack();

+		}

+		Log.d(BluetoothGpsProviderService.class.getName(), "Adding data in the NMEA file: "+ data);

+		if (trackFile != null && writer != null){

+			writer.print(data);

+		}

+	}

+	/* (non-Javadoc)

+	 * @see android.app.Service#onBind(android.content.Intent)

+	 */

+	@Override

+	public IBinder onBind(Intent intent) {

+		if (Config.LOGD){

+			Log.d(BluetoothGpsProviderService.class.getName(), "trying access IBinder");

+		}				

+		return null;

+	}

+

+	@Override

+	public void onLocationChanged(Location location) {

+		// TODO Auto-generated method stub

+	}

+

+	@Override

+	public void onProviderDisabled(String provider) {

+		Log.e(BluetoothGpsProviderService.class.getName(), "The GPS has been disabled.....stopping the NMEA tracker service.");

+		stopSelf();

+	}

+

+	@Override

+	public void onProviderEnabled(String provider) {

+		// TODO Auto-generated method stub

+	}

+

+	@Override

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

+		// TODO Auto-generated method stub		

+	}

+

+	@Override

+	public void onNmeaReceived(long timestamp, String data) {

+		addNMEAString(data);

+	}

+

+//	private void startBluetoothGps(String deviceAddress){

+//		Notification notification = new Notification(R.drawable.icon, this.getString(R.string.foreground_service_started_notification),  System.currentTimeMillis());

+//		Intent myIntent = new Intent(this, BluetoothGpsActivity.class);

+//		PendingIntent myPendingIntent = PendingIntent.getActivity(this, 0, myIntent, PendingIntent.FLAG_CANCEL_CURRENT);

+//		notification.setLatestEventInfo(getApplicationContext(), this.getString(R.string.foreground_service_started_notification_title), this.getString(R.string.foreground_service_started_notification), myPendingIntent);

+//		startForeground(R.string.foreground_service_started_notification, notification);

+//		if (BluetoothAdapter.checkBluetoothAddress(deviceAddress)){

+//			gpsManager = new BlueetoothGpsManager(this, deviceAddress);

+//			gpsManager.enable();

+//			gpsManager.enableMockLocationProvider(LocationManager.GPS_PROVIDER);

+//			toast.setText(this.getString(R.string.msg_started));

+//			toast.show();				

+////		} else {

+////			toast.setText(this.getString(R.string.msg_invalid_device));

+////			toast.show();				

+//		}

+//	}

+}

diff --git a/src/org/broeuschmeul/android/gps/nmea/util/NmeaParser.java b/src/org/broeuschmeul/android/gps/nmea/util/NmeaParser.java
new file mode 100644
index 0000000..be4e973
--- /dev/null
+++ b/src/org/broeuschmeul/android/gps/nmea/util/NmeaParser.java
@@ -0,0 +1,483 @@
+/*

+ * Copyright (C) 2010 Herbert von Broeuschmeul

+ * Copyright (C) 2010 BluetoothGPS4Droid Project

+ * 

+ * This file is part of BluetoothGPS4Droid.

+ *

+ * BluetoothGPS4Droid is free software: you can redistribute it and/or modify

+ * it under the terms of the GNU General Public License as published by

+ * the Free Software Foundation, either version 3 of the License, or

+ * (at your option) any later version.

+ * 

+ * BluetoothGPS4Droid is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU General Public License for more details.

+ * 

+ *  You should have received a copy of the GNU General Public License

+ *  along with BluetoothGPS4Droid. If not, see <http://www.gnu.org/licenses/>.

+ */

+

+package org.broeuschmeul.android.gps.nmea.util;

+

+import java.text.ParseException;

+import java.text.SimpleDateFormat;

+import java.util.TimeZone;

+import java.util.regex.Matcher;

+import java.util.regex.Pattern;

+

+import android.location.Criteria;

+import android.location.Location;

+import android.location.LocationManager;

+import android.location.LocationProvider;

+import android.os.Bundle;

+import android.text.TextUtils;

+import android.text.TextUtils.SimpleStringSplitter;

+import android.util.Log;

+

+public class NmeaParser {

+	private String fixTime;

+	private long fixTimestamp;

+

+	private boolean hasGGA = false;

+	private boolean hasRMC = false;

+	private LocationManager lm;

+	private float precision = 10f;

+	private boolean mockGpsEnabled = false;

+	private String mockLocationProvider = null;

+	

+	private Location fix = new Location(mockLocationProvider);

+	

+	public NmeaParser(){

+		this(5f);

+	}

+	public NmeaParser(float precision){

+		this.precision = precision;

+	}

+	

+	public void setLocationManager(LocationManager lm){

+		this.lm = lm;

+	}

+	 

+	public void enableMockLocationProvider(String gpsName){

+		LocationProvider prov;

+		if (gpsName != null && gpsName != "" ){

+			if (! gpsName.equals(mockLocationProvider)){

+				disableMockLocationProvider();

+				mockLocationProvider = gpsName;

+			}

+			if (! mockGpsEnabled){

+				prov = lm.getProvider(mockLocationProvider);

+				if (prov != null){

+					Log.e("BT test", "Mock provider: "+prov.getName()+" "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+lm.isProviderEnabled(mockLocationProvider));

+				}

+				lm.addTestProvider(mockLocationProvider, false, true,false, false, true, true, true, Criteria.POWER_HIGH, Criteria.ACCURACY_FINE);

+				if (! LocationManager.GPS_PROVIDER.equals(mockLocationProvider)){

+					// mockGpsEnabled = locationManager.isProviderEnabled(mockLocationProvider);

+					lm.setTestProviderEnabled(mockLocationProvider, true);

+				}

+				mockGpsEnabled = true;

+			} else {

+				Log.e("BT test", "Mock provider already enabled: "+mockLocationProvider);

+			}

+			prov = lm.getProvider(mockLocationProvider);

+			if (prov != null){

+				Log.e("BT test", "Mock provider: "+prov.getName()+" "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+lm.isProviderEnabled(mockLocationProvider));

+			}

+		}

+	}

+	

+	public void disableMockLocationProvider(){

+		LocationProvider prov;

+		if (mockLocationProvider != null && mockLocationProvider != "" && mockGpsEnabled){

+			prov = lm.getProvider(mockLocationProvider);

+			if (prov != null){

+				Log.e("BT test", "Mock provider: "+prov.getName()+" "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+lm.isProviderEnabled(mockLocationProvider));

+			}

+			mockGpsEnabled = false;

+			if (! LocationManager.GPS_PROVIDER.equals(mockLocationProvider)){

+				// mockGpsEnabled = locationManager.isProviderEnabled(mockLocationProvider);

+				lm.setTestProviderEnabled(mockLocationProvider, false);

+			}

+			// locationManager.setTestProviderEnabled(mockLocationProvider, mockGpsEnabled);

+			prov = lm.getProvider(mockLocationProvider);

+			if (prov != null){

+				Log.e("BT test", "Mock provider: "+prov.getName()+" "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+lm.isProviderEnabled(mockLocationProvider));

+			}

+			lm.clearTestProviderEnabled(mockLocationProvider);

+			prov = lm.getProvider(mockLocationProvider);

+			if (prov != null){

+				Log.e("BT test", "Mock provider: "+prov.getName()+" "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+lm.isProviderEnabled(mockLocationProvider));

+			}

+			lm.clearTestProviderStatus(mockLocationProvider);

+			lm.removeTestProvider(mockLocationProvider);

+			prov = lm.getProvider(mockLocationProvider);

+			if (prov != null){

+				Log.e("BT test", "Mock provider: "+prov.getName()+" "+prov.getPowerRequirement()+" "+prov.getAccuracy()+" "+lm.isProviderEnabled(mockLocationProvider));

+			}

+			Log.e("BT test", "removed mock GPS");

+		} else {

+			Log.e("BT test", "Mock provider already disabled: "+mockLocationProvider);			

+		}

+		mockLocationProvider = null;

+		mockGpsEnabled = false;

+	}

+

+	/**

+	 * @return the mockGpsEnabled

+	 */

+	public boolean isMockGpsEnabled() {

+		return mockGpsEnabled;

+	}

+	

+	/**

+	 * @return the mockLocationProvider

+	 */

+	public String getMockLocationProvider() {

+		return mockLocationProvider;

+	}

+	

+	private void notifyFix(Location fix){

+		//R.drawable.stat

+		fixTime = null;

+		hasGGA = false;

+		hasRMC=false;

+		if (fix != null){

+			Log.e(this.getClass().getSimpleName(), "New Fix: "+System.currentTimeMillis()+" "+fix);

+			if (lm != null && mockGpsEnabled){

+				lm.setTestProviderLocation(mockLocationProvider, fix);

+				Log.e(this.getClass().getSimpleName(), "New Fix notified to Location Manager: "+mockLocationProvider);

+			}

+			this.fix = null;

+		}

+	}

+	

+	// parse NMEA Sentence 

+	public void parseNmeaSentence(String gpsSentence){

+		Log.e("BT test", "data: "+System.currentTimeMillis()+" "+gpsSentence);

+		Pattern xx = Pattern.compile("\\$([^*$]*)\\*([0-9A-F][0-9A-F])?\r\n");

+		Matcher m = xx.matcher(gpsSentence);

+		if (m.matches()){

+			String sentence = m.group(1);

+			String checkSum = m.group(2);

+			Log.e("BT test", "data: "+System.currentTimeMillis()+" "+sentence+" cheksum; "+checkSum +" control: "+String.format("%X",computeChecksum(sentence)));

+			SimpleStringSplitter splitter = new TextUtils.SimpleStringSplitter(',');

+			splitter.setString(sentence);

+			String command = splitter.next();

+			if (command.equals("GPGGA")){

+				/* $GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47

+					

+					Where:

+					     GGA          Global Positioning System Fix Data

+					     123519       Fix taken at 12:35:19 UTC

+					     4807.038,N   Latitude 48 deg 07.038' N

+					     01131.000,E  Longitude 11 deg 31.000' E

+					     1            Fix quality: 0 = invalid

+					                               1 = GPS fix (SPS)

+					                               2 = DGPS fix

+					                               3 = PPS fix

+											       4 = Real Time Kinematic

+											       5 = Float RTK

+					                               6 = estimated (dead reckoning) (2.3 feature)

+											       7 = Manual input mode

+											       8 = Simulation mode

+					     08           Number of satellites being tracked

+					     0.9          Horizontal dilution of position

+					     545.4,M      Altitude, Meters, above mean sea level

+					     46.9,M       Height of geoid (mean sea level) above WGS84

+					                      ellipsoid

+					     (empty field) time in seconds since last DGPS update

+					     (empty field) DGPS station ID number

+					     *47          the checksum data, always begins with *

+				 */

+				// UTC time of fix HHmmss.S

+				String time = splitter.next();

+				// latitude ddmm.M

+				String lat = splitter.next();

+				// direction (N/S)

+				String latDir = splitter.next();

+				// longitude dddmm.M

+				String lon = splitter.next();

+				// direction (E/W)

+				String lonDir = splitter.next();

+				/* fix quality: 

+				  	0= invalid

+					1 = GPS fix (SPS)

+					2 = DGPS fix

+					3 = PPS fix

+					4 = Real Time Kinematic

+					5 = Float RTK

+					6 = estimated (dead reckoning) (2.3 feature)

+					7 = Manual input mode

+					8 = Simulation mode

+				 */			 

+				String quality = splitter.next();

+				// Number of satellites being tracked

+				String nbSat = splitter.next();

+				// Horizontal dilution of position (float)

+				String hdop = splitter.next();

+				// Altitude, Meters, above mean sea level

+				String alt = splitter.next();

+				// Height of geoid (mean sea level) above WGS84 ellipsoid

+				String geoAlt = splitter.next();

+				// time in seconds since last DGPS update

+				// DGPS station ID number

+				if (quality != null && !quality.equals("") && !quality.equals("0") ){

+					if (! time.equals(fixTime)){

+						notifyFix(fix);

+						fix = new Location(mockLocationProvider);

+						fixTime = time;

+						fixTimestamp = parseNmeaTime(time);

+						fix.setTime(fixTimestamp);				

+						Log.e(this.getClass().getSimpleName(), "Fix: "+fix);

+					}

+					if (lat != null && !lat.equals("")){

+						fix.setLatitude(parseNmeaLatitude(lat,latDir));

+					}

+					if (lon != null && !lon.equals("")){

+						fix.setLongitude(parseNmeaLongitude(lon,lonDir));

+					}

+					if (hdop != null && !hdop.equals("")){

+						fix.setAccuracy(Float.parseFloat(hdop)*precision);

+					}

+					if (alt != null && !alt.equals("")){

+						fix.setAltitude(Double.parseDouble(alt));

+					}

+					if (nbSat != null && !nbSat.equals("")){

+						Bundle extras = new Bundle();

+						extras.putInt("satellites", Integer.parseInt(nbSat));

+						fix.setExtras(extras);

+					}

+					Log.e(this.getClass().getSimpleName(), "Fix: "+System.currentTimeMillis()+" "+fix);

+					hasGGA = true;

+					if (hasGGA && hasRMC){

+						notifyFix(fix);

+					}

+				}		

+			} else if (command.equals("GPRMC")){

+				/* $GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A

+	

+				   Where:

+				     RMC          Recommended Minimum sentence C

+				     123519       Fix taken at 12:35:19 UTC

+				     A            Status A=active or V=Void.

+				     4807.038,N   Latitude 48 deg 07.038' N

+				     01131.000,E  Longitude 11 deg 31.000' E

+				     022.4        Speed over the ground in knots

+				     084.4        Track angle in degrees True

+				     230394       Date - 23rd of March 1994

+				     003.1,W      Magnetic Variation

+				     *6A          The checksum data, always begins with *

+				*/

+				// UTC time of fix HHmmss.S

+				String time = splitter.next();

+				// fix status (A/V)

+				String status = splitter.next();

+				// latitude ddmm.M

+				String lat = splitter.next();

+				// direction (N/S)

+				String latDir = splitter.next();

+				// longitude dddmm.M

+				String lon = splitter.next();

+				// direction (E/W)

+				String lonDir = splitter.next();

+				// Speed over the ground in knots		 

+				String speed = splitter.next();

+				// Track angle in degrees True

+				String bearing = splitter.next();

+				// UTC date of fix DDMMYY

+				String date = splitter.next();

+				// Magnetic Variation ddd.D

+				String magn = splitter.next();

+				// Magnetic variation direction (E/W)

+				String magnDir = splitter.next();

+				// for NMEA 0183 version 3.00 active the Mode indicator field is added

+				// Mode indicator, (A=autonomous, D=differential, E=Estimated, N=not valid, S=Simulator )

+				if (status != null && !status.equals("") && status.equals("A") ){

+					if (! time.equals(fixTime)){

+						notifyFix(fix);

+						fix = new Location(mockLocationProvider);

+						fixTime = time;

+						fixTimestamp = parseNmeaTime(time);

+						fix.setTime(fixTimestamp);					

+						Log.e(this.getClass().getSimpleName(), "Fix: "+fix);

+					} 

+					if (lat != null && !lat.equals("")){

+						fix.setLatitude(parseNmeaLatitude(lat,latDir));

+					}

+					if (lon != null && !lon.equals("")){

+						fix.setLongitude(parseNmeaLongitude(lon,lonDir));

+					}

+					if (speed != null && !speed.equals("")){

+						fix.setSpeed(parseNmeaSpeed(speed, "N"));

+					} 

+					if (bearing != null && !bearing.equals("")){

+						fix.setBearing(Float.parseFloat(bearing));

+					}

+					Log.e(this.getClass().getSimpleName(), "Fix: "+System.currentTimeMillis()+" "+fix);

+					hasRMC = true;

+					if (hasGGA && hasRMC){

+						notifyFix(fix);

+					}

+				}		

+			} else if (command.equals("GPGSA")){

+				/*  $GPGSA,A,3,04,05,,09,12,,,24,,,,,2.5,1.3,2.1*39

+	

+					Where:

+					     GSA      Satellite status

+					     A        Auto selection of 2D or 3D fix (M = manual) 

+					     3        3D fix - values include: 1 = no fix

+					                                       2 = 2D fix

+					                                       3 = 3D fix

+					     04,05... PRNs of satellites used for fix (space for 12) 

+					     2.5      PDOP (Position dilution of precision) 

+					     1.3      Horizontal dilution of precision (HDOP) 

+					     2.1      Vertical dilution of precision (VDOP)

+					     *39      the checksum data, always begins with *

+				 */

+				// mode : A Auto selection of 2D or 3D fix / M = manual

+				String mode = splitter.next();

+				// fix type  : 1 - no fix / 2 - 2D / 3 - 3D

+				String fixType = splitter.next();

+				// discard PRNs of satellites used for fix (space for 12) 

+				for (int i=0 ; ((i<12)&&(! "1".equals(fixType)))  ; i++){

+					splitter.next();

+				}

+				// Position dilution of precision (float)

+				String pdop = splitter.next();

+				// Horizontal dilution of precision (float)

+				String hdop = splitter.next();

+				// Vertical dilution of precision (float)

+				String vdop = splitter.next();			

+			} else if (command.equals("GPVTG")){

+				/*  $GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*48

+					

+					where:

+					        VTG          Track made good and ground speed

+					        054.7,T      True track made good (degrees)

+					        034.4,M      Magnetic track made good

+					        005.5,N      Ground speed, knots

+					        010.2,K      Ground speed, Kilometers per hour

+					        *48          Checksum

+				 */

+				// Track angle in degrees True

+				String bearing = splitter.next();

+				// T

+				splitter.next();

+				// Magnetic track made good

+				String magn = splitter.next();

+				// M

+				splitter.next();

+				// Speed over the ground in knots		 

+				String speedKnots = splitter.next();

+				// N

+				splitter.next();

+				// Speed over the ground in Kilometers per hour		 

+				String speedKm = splitter.next();

+				// K

+				splitter.next();

+				// for NMEA 0183 version 3.00 active the Mode indicator field is added

+				// Mode indicator, (A=autonomous, D=differential, E=Estimated, N=not valid, S=Simulator )

+			} else if (command.equals("GPGLL")){

+				/*  $GPGLL,4916.45,N,12311.12,W,225444,A,*1D

+					

+					Where:

+					     GLL          Geographic position, Latitude and Longitude

+					     4916.46,N    Latitude 49 deg. 16.45 min. North

+					     12311.12,W   Longitude 123 deg. 11.12 min. West

+					     225444       Fix taken at 22:54:44 UTC

+					     A            Data Active or V (void)

+					     *iD          checksum data

+				 */

+				// latitude ddmm.M

+				String lat = splitter.next();

+				// direction (N/S)

+				String latDir = splitter.next();

+				// longitude dddmm.M

+				String lon = splitter.next();

+				// direction (E/W)

+				String lonDir = splitter.next();

+				// UTC time of fix HHmmss.S

+				String time = splitter.next();

+				// fix status (A/V)

+				String status = splitter.next();

+				// for NMEA 0183 version 3.00 active the Mode indicator field is added

+				// Mode indicator, (A=autonomous, D=differential, E=Estimated, N=not valid, S=Simulator )

+			}

+		}

+	}

+

+	public double parseNmeaLatitude(String lat,String orientation){

+		double latitude = 0.0;

+		if (lat != null && orientation != null && !lat.equals("") && !orientation.equals("")){

+			double temp1 = Double.parseDouble(lat);

+			double temp2 = Math.floor(temp1/100); 

+			double temp3 = (temp1/100 - temp2)/0.6;

+			if (orientation.equals("S")){

+				latitude = -(temp2+temp3);

+			} else if (orientation.equals("N")){

+				latitude = (temp2+temp3);

+			}

+		}

+		return latitude;

+	}

+	public double parseNmeaLongitude(String lon,String orientation){

+		double longitude = 0.0;

+		if (lon != null && orientation != null && !lon.equals("") && !orientation.equals("")){

+			double temp1 = Double.parseDouble(lon);

+			double temp2 = Math.floor(temp1/100); 

+			double temp3 = (temp1/100 - temp2)/0.6;

+			if (orientation.equals("W")){

+				longitude = -(temp2+temp3);

+			} else if (orientation.equals("E")){

+				longitude = (temp2+temp3);

+			}

+		}

+		return longitude;

+	}

+	public float parseNmeaSpeed(String speed,String metric){

+		float meterSpeed = 0.0f;

+		if (speed != null && metric != null && !speed.equals("") && !metric.equals("")){

+			float temp1 = Float.parseFloat(speed)/3.6f;

+			if (metric.equals("K")){

+				meterSpeed = temp1;

+			} else if (metric.equals("N")){

+				meterSpeed = temp1*1.852f;

+			}

+		}

+		return meterSpeed;

+	}

+	public long parseNmeaTime(String time){

+		long timestamp = 0;

+		SimpleDateFormat fmt = new SimpleDateFormat("HHmmss.S");

+		fmt.setTimeZone(TimeZone.getTimeZone("GMT"));

+		try {

+			if (time != null && time != null){

+				long now = System.currentTimeMillis();

+				long today = now - (now %86400000L);

+				long temp1;

+				temp1 = fmt.parse(time).getTime();

+				long temp2 = today+temp1;

+				// 

+				if (temp2 - now > 43200000L) {

+					timestamp  = temp2 - 86400000L;

+				} else if (now - temp2 > 43200000L){

+					timestamp  = temp2 + 86400000L;

+				} else {

+					timestamp  = temp2;

+				}

+			}

+		} catch (ParseException e) {

+			// TODO Auto-generated catch block

+			Log.e(this.getClass().getSimpleName(), "Error while parsing NMEA time", e);

+		}

+		return timestamp;

+	}

+	public byte computeChecksum(String s){

+		byte checksum = 0;

+		for (char c : s.toCharArray()){

+			checksum ^= (byte)c;			

+		}

+		return checksum;

+	}

+}