cómo mostrar el tiempo de viaje entre dos ubicaciones en Google Map Android API V2, en mi programa i usando JSONParse para mostrar la distancia de conducción, pero no puedo mostrar el tiempo de viaje de la pantalla.

public class DirectionActivity extends FragmentActivity implements OnMyLocationChangeListener{

private LatLng          start;
private LatLng          end;
private String          nama;
private final String    URL = "http://maps.googleapis.com/maps/api/directions/json?";
private GoogleMap       map;
private JSONHelper      json;
private ProgressDialog  pDialog;
private List<LatLng>    listDirections;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_direction);
    json = new JSONHelper();
    setupMapIfNeeded();

    Bundle b = getIntent().getExtras();
    if (b != null)
    {
        start = new LatLng(b.getDouble(MainActivity.KEY_LAT_ASAL), b.getDouble(MainActivity.KEY_LNG_ASAL));
        end = new LatLng(b.getDouble(MainActivity.KEY_LAT_TUJUAN), b.getDouble(MainActivity.KEY_LNG_TUJUAN));
        nama = b.getString(MainActivity.KEY_NAMA);
    }

    new AsyncTaskDirection().execute();
}

private void setupMapIfNeeded()
{
    if (map == null)
    {
        FragmentManager fragmentManager = getSupportFragmentManager();
        SupportMapFragment supportMapFragment = (SupportMapFragment) fragmentManager
                .findFragmentById(R.id.mapsdirections);
        map = supportMapFragment.getMap();

        if (map != null)
        {
            setupMap();
        }
    }

}

private void setupMap()
{
    map.setMyLocationEnabled(true);
    map.setOnMyLocationChangeListener(this);
    moveToMyLocation();
}

private void moveToMyLocation()
{
    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();

    Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
    if (location != null)
    {
        map.animateCamera(CameraUpdateFactory.newLatLngZoom(
                new LatLng(location.getLatitude(), location.getLongitude()), 13));
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
protected void onResume()
{
    // TODO Auto-generated method stub
    super.onResume();
    int resCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
    if (resCode != ConnectionResult.SUCCESS)
    {
        GooglePlayServicesUtil.getErrorDialog(resCode, this, 1);
    }
}

private class AsyncTaskDirection extends AsyncTask<Void, Void, Void>
{
    @Override
    protected Void doInBackground(Void... params)
    {
        String uri = URL
                + "origin=" + start.latitude + "," + start.longitude
                + "&destination=" + end.latitude + "," + end.longitude
                + "&sensor=true&units=metric";

        JSONObject jObject = json.getJSONFromURL(uri);
        listDirections = json.getDirection(jObject);

        return null;
    }

    @Override
    protected void onPreExecute()
    {
        // TODO Auto-generated method stub
        super.onPreExecute();
        pDialog = new ProgressDialog(DirectionActivity.this);
        pDialog.setMessage("Loading....");
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @Override
    protected void onPostExecute(Void result)
    {
        // TODO Auto-generated method stub
        super.onPostExecute(result);
        pDialog.dismiss();
        gambarDirection();
    }

}

public void gambarDirection()
{
    PolylineOptions line = new PolylineOptions().width(3).color(Color.BLUE);
    for (int i = 0; i < listDirections.size(); i++)
    {
        line.add(listDirections.get(i));
    }
    map.addPolyline(line);

    // tambah marker di posisi end
    map.addMarker(new MarkerOptions()
            .position(end)
            .title(nama));
}

@Override
public void onMyLocationChange(Location location)
{
    Toast.makeText(this, "Lokasi berubah ke " + location.getLatitude() + "," + location.getLongitude(),
            Toast.LENGTH_SHORT).show();

}

}

JSONHelper.java

public class JSONHelper
{
private InputStream     is              = null;
private JSONObject      jsonObject      = null;
private String          json            = "";

private final String    TAG_TEMPATMAKAN = "tempatmakan";
private final String    TAG_ID          = "id";
private final String    TAG_NAMA        = "nama";
private final String    TAG_ALAMAT      = "alamat";
private final String    TAG_LAT         = "lat";
private final String    TAG_LNG         = "lng";
private final String    TAG_ROUTES      = "routes";
private final String    TAG_LEGS        = "legs";
private final String    TAG_STEPS       = "steps";
private final String    TAG_POLYLINE    = "polyline";
private final String    TAG_POINTS      = "points";
private final String    TAG_START       = "start_location";
private final String    TAG_END         = "end_location";

public JSONObject getJSONFromURL(String url)
{
    try
    {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet httpGet = new HttpGet(url);

        HttpResponse httpResponse = httpClient.execute(httpGet);
        HttpEntity httpEntity = httpResponse.getEntity();
        is = httpEntity.getContent();
    } catch (UnsupportedEncodingException e)
    {
        e.printStackTrace();
    } catch (ClientProtocolException e)
    {
        e.printStackTrace();
    } catch (IOException e)
    {
        e.printStackTrace();
    }

    try
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                is, "iso-8859-1"), 8);

        StringBuilder sb = new StringBuilder();
        String line = null;

        while ((line = reader.readLine()) != null)
        {
            sb.append(line + "\n");
        }

        is.close();
        json = sb.toString();
    } catch (Exception e)
    {
        // TODO: handle exception
    }

    try
    {
        jsonObject = new JSONObject(json);

    } catch (JSONException e)
    {
        // TODO: handle exception
    }

    return jsonObject;
}

public ArrayList<TempatMakan> getTempatMakanAll(JSONObject jobj)
{
    ArrayList<TempatMakan> listTempatMakan = new ArrayList<TempatMakan>();

    try
    {
        JSONArray arrayTempatMakan = jobj.getJSONArray(TAG_TEMPATMAKAN);

        for (int i = 0; i < arrayTempatMakan.length(); i++)
        {
            JSONObject jobject = arrayTempatMakan.getJSONObject(i);

            Log.d("log", "muter ke " + i);
            listTempatMakan.add(new TempatMakan(jobject.getInt(TAG_ID), jobject.getString(TAG_NAMA), jobject
                    .getString(TAG_ALAMAT), jobject
                    .getDouble(TAG_LAT), jobject.getDouble(TAG_LNG)));

        }
    } catch (JSONException e)
    {
        e.printStackTrace();
    }
    return listTempatMakan;
}

/*
 * Untuk decode Polyline
 * 
 * @params String
 * 
 * @return List<LatLng>
 */
private List<LatLng> decodePoly(String encoded)
{
    List<LatLng> poly = new ArrayList<LatLng>();
    int index = 0, len = encoded.length();
    int lat = 0, lng = 0;
    while (index < len)
    {
        int b, shift = 0, result = 0;
        do
        {
            b = encoded.charAt(index++) - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        } while (b >= 0x20);
        int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
        lat += dlat;
        shift = 0;
        result = 0;
        do
        {
            b = encoded.charAt(index++) - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        } while (b >= 0x20);
        int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
        lng += dlng;

        LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
        poly.add(position);
    }
    return poly;

}

/*
 * Untuk mendapatkan direction
 * 
 * @params JSONObject
 * 
 * @return List<LatLng>
 */
public List<LatLng> getDirection(JSONObject jObj)
{

    List<LatLng> directions = new ArrayList<LatLng>();

    try
    {
        JSONObject objRoute = jObj.getJSONArray(TAG_ROUTES).getJSONObject(0);
        JSONObject objLegs = objRoute.getJSONArray(TAG_LEGS).getJSONObject(0);
        JSONArray arraySteps = objLegs.getJSONArray(TAG_STEPS);
        for (int wi2t = 0; wi2t < arraySteps.length(); wi2t++)
        {
            JSONObject step = arraySteps.getJSONObject(wi2t);
            JSONObject objStart = step.getJSONObject(TAG_START);
            JSONObject objEnd = step.getJSONObject(TAG_END);
            double latStart = objStart.getDouble(TAG_LAT);
            double lngStart = objStart.getDouble(TAG_LNG);

            directions.add(new LatLng(latStart, lngStart));

            JSONObject poly = step.getJSONObject(TAG_POLYLINE);
            String encodedPoly = poly.getString(TAG_POINTS);

            List<LatLng> decodedPoly = decodePoly(encodedPoly);
            for (int eka = 0; eka < decodedPoly.size(); eka++)
            {
                directions.add(new LatLng(decodedPoly.get(eka).latitude, decodedPoly.get(eka).longitude));
            }

            double latEnd = objEnd.getDouble(TAG_LAT);
            double lngEnd = objEnd.getDouble(TAG_LNG);
            directions.add(new LatLng(latEnd, lngEnd));

        }
    } catch (JSONException e)
    {
        // TODO: handle exception
    }

    return directions;
}
}

MainActivity.java

public class MainActivity extends FragmentActivity implements OnInfoWindowClickListener
{
private GoogleMap           map;
private JSONHelper          json;
private ProgressDialog      pDialog;
private Button      btnGetDirection;

private List<TempatMakan>   listTempatMakan;
private final String        URL_API     = "http://lhocation1203.hostzi.com/dataapi/tempatmakan.php";

public static final String  KEY_NAMA    = "nama";
public static final String  KEY_ALAMAT  = "alamat";
public static final String  KEY_LAT_TUJUAN  = "lat_tujuan";
public static final String  KEY_LNG_TUJUAN  = "lng_tujuan";
public static final String  KEY_LAT_ASAL    = "lat_asal";
public static final String  KEY_LNG_ASAL    = "lng_asal";

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    json = new JSONHelper();

    new AsynTaskMain().execute();

    setupMapIfNeeded();
}

private void setupMapIfNeeded()
{
    if (map == null)
    {
        FragmentManager fragmentManager = getSupportFragmentManager();
        SupportMapFragment supportMapFragment = (SupportMapFragment) fragmentManager.findFragmentById(R.id.maps);
        map = supportMapFragment.getMap();

        if (map != null)
        {
            setupMap();
        }
    }

}

private void setupMap()
{
    map.setMyLocationEnabled(true);
    map.setOnInfoWindowClickListener(this);
    moveToMyLocation();
}

private void moveToMyLocation()
{
    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    Criteria criteria = new Criteria();

    Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
    if (location != null)
    {
        map.animateCamera(CameraUpdateFactory.newLatLngZoom(
                new LatLng(location.getLatitude(), location.getLongitude()), 13));
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
protected void onResume()
{
    // TODO Auto-generated method stub
    super.onResume();

    int resCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
    if (resCode != ConnectionResult.SUCCESS)
    {
        GooglePlayServicesUtil.getErrorDialog(resCode, this, 1);
    }
}

private class AsynTaskMain extends AsyncTask<Void, Void, Void>
{

    @Override
    protected void onPostExecute(Void result)
    {
        // TODO Auto-generated method stub
        pDialog.dismiss();
        runOnUiThread(new Runnable()
        {

            @Override
            public void run()
            {
                // TODO Auto-generated method stub
                for (int i = 0; i < listTempatMakan.size(); i++)
                {

                    map.addMarker(new MarkerOptions()
                            .position(new LatLng(listTempatMakan.get(i).getLat(),
                                    listTempatMakan.get(i).getLng()))
                            .title(listTempatMakan.get(i).getNama())
                            .snippet(listTempatMakan.get(i).getAlamat()));

                }
            }
        });

        super.onPostExecute(result);
    }

    @Override
    protected void onPreExecute()
    {
        // TODO Auto-generated method stub
        super.onPreExecute();
        pDialog = new ProgressDialog(MainActivity.this);
        pDialog.setMessage("Loading....");
        pDialog.setCancelable(true);
        pDialog.show();
    }

    @Override
    protected Void doInBackground(Void... params)
    {
        // TODO Auto-generated method stub

        JSONObject jObject = json.getJSONFromURL(URL_API);
        listTempatMakan = json.getTempatMakanAll(jObject);
        return null;
    }
}

@Override
public void onInfoWindowClick(Marker marker)
{
    // marker id -> m0, m1, m2 dst..
    String id = marker.getId();
    id = id.substring(1);

    LatLng myLocation = new LatLng(map.getMyLocation().getLatitude(), map.getMyLocation().getLongitude());

    if (myLocation != null)
    {
        Bundle bundle = new Bundle();
        bundle.putString(KEY_NAMA, listTempatMakan.get(Integer.parseInt(id)).getNama());
        bundle.putString(KEY_ALAMAT, listTempatMakan.get(Integer.parseInt(id)).getAlamat());
        bundle.putDouble(KEY_LAT_TUJUAN, marker.getPosition().latitude);
        bundle.putDouble(KEY_LNG_TUJUAN, marker.getPosition().longitude);
        bundle.putDouble(KEY_LAT_ASAL, myLocation.latitude);
        bundle.putDouble(KEY_LNG_ASAL, myLocation.longitude);

        Intent i = new Intent(MainActivity.this, InfoTempatMakanActivity.class);
        i.putExtras(bundle);
        startActivity(i);

    } else
    {
        Toast.makeText(this, "Tidak dapat menemukan lokasi anda ", Toast.LENGTH_LONG).show();
    }
}
}

InfoTempatMakanActivity.java

public class InfoTempatMakanActivity extends Activity implements OnClickListener
{

private TextView    tvNama;
private TextView    tvAlamat;
private Button      btnGetDirection;

private LatLng      lokasiTujuan;
private LatLng      lokasiAwal;
private String      nama;
private String      alamat;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_info_tempat_makan);

    initialize();

    Bundle bundle = getIntent().getExtras();
    if (bundle != null)
    {
        nama = bundle.getString(MainActivity.KEY_NAMA);
        alamat = bundle.getString(MainActivity.KEY_ALAMAT);
        lokasiTujuan = new LatLng(bundle.getDouble(MainActivity.KEY_LAT_TUJUAN),
                bundle.getDouble(MainActivity.KEY_LNG_TUJUAN));
        lokasiAwal = new LatLng(bundle.getDouble(MainActivity.KEY_LAT_ASAL),
                bundle.getDouble(MainActivity.KEY_LNG_ASAL));
    }

    setTeksView();

}

private void setTeksView()
{
    tvNama.setText(nama);
    tvAlamat.setText(alamat);
}

private void initialize()
{
    tvAlamat = (TextView) findViewById(R.id.alamatTempatMakan);
    tvNama = (TextView) findViewById(R.id.namaTempatMakan);
    btnGetDirection = (Button) findViewById(R.id.btnDirection);
    btnGetDirection.setOnClickListener(this);
}

@Override
public void onClick(View v)
{
    Bundle bundle = new Bundle();
    bundle.putDouble(MainActivity.KEY_LAT_ASAL, lokasiAwal.latitude);
    bundle.putDouble(MainActivity.KEY_LNG_ASAL, lokasiAwal.longitude);
    bundle.putDouble(MainActivity.KEY_LAT_TUJUAN, lokasiTujuan.latitude);
    bundle.putDouble(MainActivity.KEY_LNG_TUJUAN, lokasiTujuan.longitude);
    bundle.putString(MainActivity.KEY_NAMA, nama);

    Intent intent = new Intent(this, DirectionActivity.class);
    intent.putExtras(bundle);

    startActivity(intent);
}

}

TempatMakan.java

public class TempatMakan
{
private int id;
private String  nama;
private String  alamat;
private double  lat;
private double  lng;

public TempatMakan()
{
    // TODO Auto-generated constructor stub
}

public TempatMakan(int id, String nama, String alamat, double lat, double lng)
{
    super();
            this.id = id;
    this.nama = nama;
    this.alamat = alamat;
    this.lat = lat;
    this.lng = lng;
}

public String getNama()
{
    return nama;
}

public void setNama(String nama)
{
    this.nama = nama;
}

public String getAlamat()
{
    return alamat;
}

public void setAlamat(String alamat)
{
    this.alamat = alamat;
}

public double getLat()
{
    return lat;
}

public void setLat(double lat)
{
    this.lat = lat;
}

public double getLng()
{
    return lng;
}

public void setLng(double lng)
{
    this.lng = lng;
}

}