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/**
	 * Calculate distance between two gps points based in Haversine formula: http://en.wikipedia.org/wiki/Haversine_formula
	 * 
	 * @param latitude1 GPS point 1 Latitude
	 * @param longitude1 GPS point 1 Longitude
	 * @param latitude2 GPS point 2 Latitude
	 * @param longitude2 GPS point 1 Longitude
	 * @return Distance in kilometers (km)
	 */
	static double haversineDistance(float latitude1, float longitude1, float latitude2, float longitude2)

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/**
	 * Convert an unsigned integer to signed (keeping binary value)
	 * 
	 * @param binary Integer whose binary value need to convert
	 * @return A byte with same binary than income integer
	 */
	private static byte fromBinaryToByte(int binary)
	{
		byte result = -1;

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/**
	 * Converts a latitude/longitude in NMEA format to grades (4322.0399N to 43.36715)
	 * @param lat_or_long latitude/longitude in NMEA format
	 * @return GPS latitude/longitude in grades
	 */
	public static float convertLatLon(String lat_or_long)
	{
		int number_of_decimals = 4; // Número de decimales de los grados

		String minute = lat_or_long.substring(lat_or_long.length() - (4 + number_of_decimals), lat_or_long.length() - 1);

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final static DateFormat DATE_FORMAT = DateFormat.getDateTimeInstance(DateFormat.SHORT, DateFormat.SHORT, Locale.getDefault());
DATE_FORMAT.format(new Date());

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/**
	 * Converts an object to a byte array
	 * 
	 * @param object Object to convert (must implement Serializable)
	 * @return The object in byte[]
	 */
	public static byte[] objectToByte(Object object)
	{
		byte[] result = null;

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/**
	 * Converts an object in byte[] to Object
	 * 
	 * @param object Object in byte[]
	 * @return The original Object
	 */
	public static Object byteToObject(byte[] object)
	{
		Object result = null;

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String convertTime(long start_time, long end_time)
{
  String result = "00:00:00";
  
  if (end_time > start_time)
  {
    long time = end_time - start_time;
  
    long time_hour = TimeUnit.MILLISECONDS.toHours(time);
    time -= TimeUnit.HOURS.toMillis(time_hour);

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ScheduledExecutorService mScheduledExecutorService = Executors.newScheduledThreadPool(1);;
Future<?> mFuture = mScheduledExecutorService.scheduleAtFixedRate(new Runnable()
{
	public void run()
	{
		// Task to do periodically
	}
}, 0L, updateTime, TimeUnit.SECONDS);

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private class MyTask extends AsyncTask<Void, String, Boolean>
	{
		private ProgessDialog mProgressDialog;

		public MyTask()
		{
			mProgressDialog = new ProgressDialog(mActivity);
			mProgressDialog.setTitle("ProgressDialog title");
			mProgressDialog.setMessage("ProgressDialog message...");
		}

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// Save to storage/folder/
File fileDir = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/folder/");
fileDir.mkdirs();

String name = "file.txt";
File mFile = new File(fileDir, name);

BufferedWriter writer = null;
try
{