我正在尝试获取纬度，经度，当前地址，当前速度并每隔5分钟发送到服务器。我可以得到lat，long，地址。但我无法从location.getSpeed（）获得当前速度。 在此我附上了我的全部代码。请查看并向我提出解决问题的宝贵建议
public class MainActivity extends FragmentActivity implements LocationListener {
private GoogleMap googleMap;
private LocationManager locationManager;
private String provider;
Location location;
UserSessionManager session;
private Handler customHandler = new Handler();
String currentdatetime_tosend, latitude_tosend, logitude_tosend,
address_tosend, speed_tosend, username_tosend, startTime_tosend;
Boolean isInternetAvail = false;
ConnectionCheck conChk;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle(GlobalConstants.loginDriverName);
System.out.println("GlobalConstants.loginDriverName==> "+GlobalConstants.loginDriverName);
session = new UserSessionManager(getApplicationContext());
try {
initilizeMap();
googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
googleMap.setMyLocationEnabled(true);
googleMap.getUiSettings().setZoomControlsEnabled(false);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
googleMap.getUiSettings().setCompassEnabled(true);
googleMap.getUiSettings().setRotateGesturesEnabled(true);
googleMap.getUiSettings().setZoomGesturesEnabled(true);
conChk = new ConnectionCheck(getApplicationContext());
GetLocaion();
} catch (Exception e) {
e.printStackTrace();
}
}
private void AddMarker(double latitude, double longitude, String driverName) {
googleMap.clear();
MarkerOptions marker = new MarkerOptions().position(
new LatLng(latitude, longitude)).title(driverName);
marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.driver_car));
googleMap.addMarker(marker);
CameraPosition cameraPosition = new CameraPosition.Builder()
.target(new LatLng(latitude, longitude)).zoom(15).build();
googleMap.animateCamera(CameraUpdateFactory
.newCameraPosition(cameraPosition));
}
@Override
public void onLocationChanged(Location location) {
if (location != null) {
Double lat = (Double) (location.getLatitude());
Double lng = (Double) (location.getLongitude());
speed_tosend = Float.toString(location.getSpeed());
Toast.makeText(getApplicationContext(),
"Speed==> " + speed_tosend.toString() + "",
Toast.LENGTH_SHORT).show();
latitude_tosend = lat.toString();
logitude_tosend = lng.toString();
getAddress();
AddMarker(lat, lng, GlobalConstants.loginDriverName);
if (conChk.isConnectingToInternet())
new SendDetailsInBackground().execute();
} else
Toast.makeText(getApplicationContext(),
"Getting Location.. Please Wait..", Toast.LENGTH_SHORT)
.show();
}
private void BackgroundProcess() {
customHandler.postDelayed(updateTimerThread, 0);
}
private Runnable updateTimerThread = new Runnable() {
public void run() {
GetLocaion();
customHandler.postDelayed(this, 30000);
}
};
private void StartTheProcess() {
BackgroundProcess();
}
private void StopGetingLocation() {
customHandler.removeCallbacks(updateTimerThread);
}
@Override
protected void onResume() {
super.onResume();
initilizeMap();
}
private void GetLocaion() {
try {
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
location = locationManager.getLastKnownLocation(provider);
if (location != null) {
onLocationChanged(location);
Toast.makeText(getApplicationContext(), "Location Activated",
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getApplicationContext(),
"No location found..!!", Toast.LENGTH_SHORT).show();
}
Toast.makeText(getApplicationContext(), "GPS IS Ennabled..!!",
Toast.LENGTH_SHORT).show();
} catch (Exception ex) {
ex.printStackTrace();
}
}
private void initilizeMap() {
if (googleMap == null) {
googleMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
if (googleMap == null) {
Toast.makeText(getApplicationContext(),
"Sorry! unable to create maps", Toast.LENGTH_SHORT)
.show();
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.startGettingLocation) {
startTime_tosend = getDateTime();
StartTheProcess();
return true;
}
if (id == R.id.stopGetingLocation) {
StopGetingLocation();
return true;
}
if (id == R.id.logout) {
exit();
}
return super.onOptionsItemSelected(item);
}
private String getDateTime() {
SimpleDateFormat dateFormat = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss", Locale.getDefault());
Date date = new Date();
return dateFormat.format(date);
}
class SendDetailsInBackground extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
}
protected String doInBackground(String... args) {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("currentdatetime",
startTime_tosend));
params.add(new BasicNameValuePair("driver_mobile",
GlobalConstants.loginDriverNumber));
params.add(new BasicNameValuePair("username",
GlobalConstants.loginDriverName));
params.add(new BasicNameValuePair("lattitude", latitude_tosend));
params.add(new BasicNameValuePair("longtitude", logitude_tosend));
params.add(new BasicNameValuePair("currentaddress", address_tosend));
params.add(new BasicNameValuePair("currentspeed", speed_tosend));
String json = sendToServer(GlobalConstants.url_pass_tripdetail,
params);
Log.d("Create Response", json.toString());
return null;
}
protected void onPostExecute(String file_url) {
}
}
public String sendToServer(String url, List<NameValuePair> params) {
String TAG = "";
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
String response = EntityUtils.toString(httpEntity);
System.out.println("Response==> " + response);
TAG = response;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return TAG;
}
private void getAddress() {
Geocoder geocoder = new Geocoder(this, Locale.getDefault());
try {
List<Address> addresses = geocoder.getFromLocation(
Double.parseDouble(latitude_tosend),
Double.parseDouble(logitude_tosend), 1);
StringBuilder sb = new StringBuilder();
if (addresses.size() > 0) {
Address address = addresses.get(0);
for (int i = 0; i < address.getMaxAddressLineIndex(); i++)
sb.append(address.getAddressLine(i) + ",");
Toast.makeText(getApplicationContext(), "Address Found..!!!",
Toast.LENGTH_LONG).show();
address_tosend = sb.toString();
} else {
Toast.makeText(getApplicationContext(), "Address is empty!",
Toast.LENGTH_SHORT).show();
}
} catch (IOException e) {
Toast.makeText(getApplicationContext(), "No Address returned!",
Toast.LENGTH_SHORT).show();
}
}
public void exit() {
new AlertDialog.Builder(this)
.setIcon(android.R.drawable.ic_dialog_alert)
.setTitle("Logout")
.setMessage("Are you sure you want to Logout?")
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
session.logoutUser();
StopGetingLocation();
finish();
}
}).setNegativeButton("No", null).show();
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}