public class QuarterMile extends Activity
{
    TextView display;
    TextView display2;

    double currentLon = 0;
    double currentLat = 0;
    double lastLon = 0;
    double lastLat = 0;
    double distanceMeters = 0;

    //the timer view
    private TextView textTimer;
    //the start finish buttons
    private Button startButton, resetButton, resetLocationButton;
    //the start time
    private long startTime = 0L;
    //create a handler
    private Handler myHandler = new Handler();
    //timing variables
    long timeInMillies = 0L, timeSwap = 0L, finalTime = 0L;

    LocationManager lm;
    Location loc;

    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.quarter_mile);

        display = (TextView) findViewById(R.id.textView1);
        display2 = (TextView) findViewById(R.id.textView2);

        //LocationManager
        lm = (LocationManager) getSystemService(LOCATION_SERVICE);
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0, Loclist);
        //Location
        loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        if(loc == null)
        {
            display.setText("No GPS location found");
            Intent i = new Intent(
                     android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            i.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
            startActivityForResult(i, 0);
            Toast.makeText(getApplicationContext(),
                    "Please set Mode to 'High accuracy' to enable GPS tracking " +
                    "and then go back to the 1/4-mile timer. Thank you.",
                     Toast.LENGTH_LONG).show();
        }
        else
        {
            //Set the last latitude and longitude
            currentLon = loc.getLongitude();
            currentLat = loc.getLatitude();
            lastLat = currentLat;
            lastLon = currentLon;
            String message = "Current Location \nLongitude: " + currentLon +
                    "\nLatitude: "+ currentLat +
                             "\nLast Location \nLongitude: " + lastLon +
                    "\nLatitude: "+ lastLat;
            Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
        }

        textTimer = (TextView) findViewById(R.id.textTimer);
        startButton = (Button) findViewById(R.id.startButton);
        resetButton = (Button) findViewById(R.id.resetButton);
        resetLocationButton = (Button) findViewById(R.id.resetLocationButton);

        resetLocationButton.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View view)
            {
                //LocationManager
                lm = (LocationManager) getSystemService(LOCATION_SERVICE);
                lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0, Loclist);
                //Location
                loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);

                if(loc != null)
                {
                    //Set the last latitude and longitude
                    currentLon = loc.getLongitude();
                    currentLat = loc.getLatitude();
                    lastLat = currentLat;
                    lastLon = currentLon;
                    String message = "Current Location \nLongitude: " + currentLon +
                        "\nLatitude: "+ currentLat +
                            "\nLast Location \nLongitude: " + lastLon +
                            "\nLatitude: "+ lastLat;
                    Toast.makeText(getApplicationContext(), message, Toast.LENGTH_LONG).show();
                }
            }
        });

        startButton.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View view)
            {
                startTime = SystemClock.uptimeMillis();
                myHandler.postDelayed(updateTimerMethod, 0);
            }
        });

        resetButton.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View view)
            {
                //reset the thread/runnable
                myHandler.removeCallbacks(updateTimerMethod);

                //reset the timer to 00:00:00
                int seconds = (int) (0);
                int minutes = seconds / 60;
                seconds = seconds % 60;
                int milliseconds = (int) (0);
                textTimer.setText("" + minutes + ":"
                        + String.format("%02d", seconds) + ":"
                                + String.format("%03d", milliseconds));
            }
        });
    }

    //start a thread to count the timer
    private Runnable updateTimerMethod = new Runnable()
    {
        public void run()
        {
            timeInMillies = SystemClock.uptimeMillis() - startTime;
            finalTime = timeSwap + timeInMillies;

            int seconds = (int) (finalTime / 1000);
            int minutes = seconds / 60;
            seconds = seconds % 60;
            int milliseconds = (int) (finalTime % 1000);
            textTimer.setText("" + minutes + ":"
                    + String.format("%02d", seconds) + ":"
                            + String.format("%03d", milliseconds));
            myHandler.postDelayed(this, 0);
            //if the distance travelled is 400 or more stop the timer
            if(distanceMeters >= 10)
            {
                timeSwap += timeInMillies;
                myHandler.removeCallbacks(updateTimerMethod);

                startTime = 0L;
                timeInMillies = 0L;
                timeSwap = 0L;
                finalTime = 0L;
            }
        }
    };

    LocationListener Loclist = new LocationListener()
    {
        @Override
        public void onLocationChanged(Location location)
        {
            //start location manager
            LocationManager lm = (LocationManager) getSystemService(LOCATION_SERVICE);
            //get last location
            Location loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            //request new location
            lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,0, Loclist);

            //get the current lat and long
            currentLat = loc.getLatitude();
            currentLon = loc.getLongitude();

            Location locationA = new Location("point A");
            locationA.setLatitude(lastLat);
            locationA.setLongitude(lastLon);

            Location locationB = new Location("point B");
            locationB.setLatitude(currentLat);
            locationB.setLongitude(currentLon);

            distanceMeters = locationA.distanceTo(locationB);
            double distanceKm = distanceMeters / 1000f;

            display.setText(String.format("%.2f Km", distanceKm));
            display2.setText("Distance is: " + distanceMeters);
        }


        /**--------------------------------------------NOT USED-----------------------------*/

        @Override
        public void onProviderDisabled(String provider)
        {
            // TODO Auto-generated method stub
        }

        @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
        }
    };
}