问题
i need to get my current coordinates. i try next, but it is does not get result.
public class FragmentNear extends SherlockFragment implements
android.location.LocationListener {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
locationManager = (LocationManager) getActivity().getSystemService(
Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 0, 0, this);
v = inflater.inflate(R.layout.fragment_near, null);
DownloadWebPageTask dw = new DownloadWebPageTask();
dw.execute("");
return v;
}
@Override
public void onLocationChanged(Location loc) {
if (showMFD == 0) {
Log.d("myLogs", "-------- onLoChanged " + myLat + " " + myLong);
myLat = loc.getLatitude();
myLong = loc.getLongitude();
Log.d("myLogs", "-------- onLoChangedEnd " + myLat + " " + myLong);
}
}
public void showMFD() {
showMFD++;
//my Tasks
}
private class DownloadWebPageTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... urls) {
Log.d("myLogs", "Background");
while (myLat==0)
{
}
showMFD();
return "";
}
@Override
protected void onPreExecute()
{
super.onPreExecute();
pb = new ProgressDialog(getActivity());
pb.setMessage("Получение данных GPS...");
pb.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pb.show();
}
@Override
protected void onPostExecute(String result) {
pb.dismiss();
}
}
My logic is in the picture
回答1:
An example of tracker class to use wifi or classic gps (3g, h+, gprs...)
public class GPSTracker extends Service implements android.location.LocationListener {
/**
* ATTRIBUTES
*/
private static final String TAG = GPSTracker.class.getSimpleName();
private Context _context;
private static GPSTracker _instance;
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 0; // meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 30 * 1; // minute
// Declaring a Location Manager
protected LocationManager _locationManager;
/**
* PUBLIC ATTRIBUTES
*/
boolean _isGPSEnabled = false;
boolean _isNetworkEnabled = false;
boolean _canGetLocation = false;
public Location _location;
double _latitude;
double _longitude;
public GPSTracker() {
_context = null;
}
public static GPSTracker getInstance() {
if (_instance == null) {
_instance = new GPSTracker();
}
return _instance;
}
public void set_context(Context context) {
this._context = context;
}
public Location getLocation(Context context) {
_context = context;
try {
_locationManager = (LocationManager) _context.getSystemService(LOCATION_SERVICE);
_isGPSEnabled = _locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
_isNetworkEnabled = _locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!_isGPSEnabled && !_isNetworkEnabled) {
// no network provider is enabled
}
else {
this._canGetLocation = true;
if (_isNetworkEnabled) {
_locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (_locationManager != null) {
_location = _locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (_location != null) {
_latitude = _location.getLatitude();
_longitude = _location.getLongitude();
}
}
}
// if GPS Enabled get lat/long using GPS Services
if (_isGPSEnabled) {
if (_location == null) {
_locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (_locationManager != null) {
_location = _locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (_location != null) {
_latitude = _location.getLatitude();
_longitude = _location.getLongitude();
}
}
}
}
}
}
catch (Exception e) {
// do nothing
}
return _location;
}
public void stopUsingGPS() {
if (_locationManager != null) {
_locationManager.removeUpdates(GPSTracker.this);
}
}
public double getLatitude() {
if (_location != null) {
_latitude = _location.getLatitude();
}
return _latitude;
}
public double getLongitude() {
if (_location != null) {
_longitude = _location.getLongitude();
}
return _longitude;
}
public boolean canGetLocation() {
return this._canGetLocation;
}
/**
* Function to show settings alert dialog On pressing Settings button will lauch Settings Options
*/
public void showSettingsAlert(String title, String msg) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(_context);
alertDialog.setTitle(title);
alertDialog.setMessage(msg);
// Settings button
alertDialog.setPositiveButton("Paramètres", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
_context.startActivity(intent);
}
});
// cancel button
alertDialog.setNegativeButton("Annuler", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// show
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
It is as fast as the network/gps/phone (thanks android) you just need to create GPSTracker.java then an object :
//create an instance singleton
GPSTracker tracker = GPSTracker.getInstance();
// you can use this in "if" to test if location is updated ok
gpsTracker.canGetLocation()
//update the location as much as you want with this method
tracker.getLocation(this);
//retreive the location when you need it
Location location = EtablissementApplication._gpsTracker._location
In onDestroy() or when you don't want to use the gps anymore don't forget :
if (tracker != null) {
tracker.stopUsingGPS();
}
来源：https://stackoverflow.com/questions/18446619/get-gps-coordinates-with-asynctask