Develop Reference

Remove Location Listener

I want after open dialog and click on location button, detect user's location and show user's location and then user dismiss dialog, location listener removes and not get location from onLocationChanged, I try used locationManager.removeUpdate(locListener)on override dismiss but not any chance and location after dismiss again shows! why? How can i detect user's location after show dialog and after detect location, location listener remove? Thanks
EDIT:
public class DialogTest extends Dialog implements
android.view.View.OnClickListener {
Context context;
LocationManager locationManager;
LocationListener locationListener;
Location location;
public DialogTest(Context context) {
super(context);
// TODO Auto-generated constructor stub
requestWindowFeature(Window.FEATURE_NO_TITLE);
this.context = context;
setContentView(R.layout.profile_dialog);
getWindow().setBackgroundDrawableResource(R.drawable.background_dialog);
firstAccessLocation=true;
setCancelable(true);
initialize();
}
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
findAddress();
}
private void findAddress() {
// if (gpsCheckBox.isChecked()) {
locationManager = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
locationListener = new GPSLocationListener();
locationManager.requestLocationUpdates(locationManager.GPS_PROVIDER, 0,
0, locationListener);
locationManager.requestLocationUpdates(
locationManager.NETWORK_PROVIDER, 0, 0, locationListener);
// }
}
private void stopTracking(){
if(locationManager!=null){
locationManager.removeUpdates(locationListener);
}
}
#Override
public void dismiss() {
// TODO Auto-generated method stub
stopTracking();
gpsTurnOff();
super.dismiss();
}
public class GPSLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location loc) {
// TODO Auto-generated method stub
if(location!=null)
Log.e("location", location.getLatitude()+"");
location = loc;
if (location != null&& firstAccessLocation) {
setAddress(location.getLatitude(), location.getLongitude());
firstAccessLocation=false;
}
Toast.makeText(context, "changed", Toast.LENGTH_LONG).show();
Log.e("location", "changed");
}
#Override
public void onProviderDisabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String arg0) {
// TODO Auto-generated method stub
}
#Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
// TODO Auto-generated method stub
}
}
}

In new code you should use LocationClient rather then LocationManager. It's more efficient in getting the location with minimal energy(battery drain) with greater accuracy. Look here LocationClient vs LocationManager. With LocationClient established you can call getLastLocation() which provide you last location and doesn't start cyclic location updates.
If you want to stick with LocationManager use requestSingleUpdate (String provider, LocationListener listener, Looper looper) method to get only one newest location from it.

Arcgis : how to get device location

Hie i tried to implement this codes in my application but it doesnt work , i dont know where i went wrong.
basically, when i launch the sample of the device location. it doesnt show me where is my current location and i dont see any blue dots that resembles the current location i am at.
the only thing that i see is the map . just a plain zoom out map.
I would be really thankful if someone who could help me out on how to get the current location with the blue dots that is displayed on the map..
this is my MainActivity.class
public class HelloWorld extends Activity {
MapView mMapView = null;
ArcGISTiledMapServiceLayer tileLayer;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// Retrieve the map and initial extent from XML layout
mMapView = (MapView) findViewById(R.id.map);
mMapView.addLayer(new ArcGISTiledMapServiceLayer(
"http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"));
mMapView.setOnStatusChangedListener(new OnStatusChangedListener() {
public void onStatusChanged(Object source, STATUS status) {
if (source == mMapView && status == STATUS.INITIALIZED) {
LocationService ls = mMapView.getLocationService();
ls.setAutoPan(false);
ls.start();
}
}
});
}
protected void onPause() {
super.onPause();
mMapView.pause();
}
#Override
protected void onResume() {
super.onResume();
mMapView.unpause();
}
}

this is a code that draws my location every 1 second via provider and GPS .
let's first declare variables :
private GraphicsLayer myGraphicalLayer;
MapView mMapView;
ArcGISLocalTiledLayer baseLayer;
private LocationManager mlocManager;
private LocationListener mlocListener;
in onCreate function WE CALL LocationListener:
mlocManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
mlocListener = new MyLocationListener();
mlocManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, mlocListener);
mlocManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 1000, 0, mlocListener);
// loading the map
mMapView = (MapView) findViewById(R.id.localMap);
baseLayer = new ArcGISLocalTiledLayer(basemapurl);
mMapView.addLayer(baseLayer);
// defining my position layer
myGraphicalLayer = new GraphicsLayer();
then a function to draw my location :
private void SetMyLocationPoint(final double x, final double y) {
PictureMarkerSymbol myPin = new PictureMarkerSymbol(getResources().getDrawable(
R.drawable.mylocation_icon));
Point wgspoint = new Point(x, y);
Point mapPoint = (Point) GeometryEngine.project(wgspoint, SpatialReference.create(4326),
mMapView.getSpatialReference());
Graphic myPinGraphic = new Graphic(mapPoint, myPin);
try {
myGraphicalLayer.removeAll();
} catch (Exception e) {
e.printStackTrace();
}
myGraphicalLayer.addGraphic(myPinGraphic);
myGraphicalLayer.setVisible(true);
mMapView.addLayer(myGraphicalLayer);
}
make internal class that implements MyLocationListener to get you instant location, and let it call the function named SetMyLocationPoint like this way :
public class MyLocationListener implements LocationListener {
#Override
public void onLocationChanged(Location loc) {
SetMyLocationPoint(loc.getLongitude(), loc.getLatitude());
}
#Override
public void onProviderDisabled(String provider) {
Toast.makeText(getApplicationContext(), "provider enabled", Toast.LENGTH_SHORT)
.show();
}
#Override
public void onProviderEnabled(String provider) {
Toast.makeText(getApplicationContext(), "provider disabled", Toast.LENGTH_SHORT)
.show();
}
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
}

You need to use your own location manager or the location client to get the device's current location and then you will have to add that point on the map.
Your map should be in a MapFragment.
Get the googleMap object from the fragment and then add your custom blue dot on it.
LocationManager locationManager = (LocationManager) getApplicationContext()
.getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
5000, 5, listener);
}
private LocationListener listener = new LocationListener() {
#Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
Log.e("Google", "Location Changed");
if (location == null)
return;
Log.e("latitude", location.getLatitude() + "");
Log.e("longitude", location.getLongitude() + "");
}
}
#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
}
};
The above code gets you the location in onLocationChanged method.
Note: i have used GPS_PROVIDER to get the location.
There are other ways to get the current location too.

OnPause to stop GPS

UPDATE #2. My initial question was solved by the kindness of the two who answered. Apparently I need to start a new question for the fact that the resulting code, while it runs, does not stop the GPS. But there are no errors now so I would mark this as solved if I knew how :-)
UPDATE.
I have "working" code thanks to comments the only problem is that it doesn't do what it is supposed to do. It is working in that there are no errors.
To make it work, I added this globally at the top of the activity.
protected LocationListener ll;
protected LocationManager lm;
And used this OnPause code
#Override
protected void onPause() {
if(lm != null) {
lm.removeUpdates(ll);
}
ll = null;
lm = null;
super.onPause();
}
Everything compiles and runs on a phone. I get GPS locations displayed. Trouble is that the goal is to get the GPS to turn off so that the battery doesn't go dead after leaving the application. But the GPS stays on. I see this is a common complaint and have not seen an answer. I thought lm.removeUpdates(ll) was the solution but it isn't working.
--------------- original post -------------------------
I want to add some OnPause code to stop my GPS updates. I have tired at least a dozen examples of code from stackoverflow both questions and answers and all give errors in Eclipse.
My GPS code is here (it works fine):
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textLat = (TextView)findViewById(R.id.textLat);
textLong = (TextView)findViewById(R.id.textLong);
textTimex = (TextView)findViewById(R.id.textTimex);
LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
LocationListener ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
}
class mylocationlistener implements LocationListener{
#Override
public void onLocationChanged(Location location) {
if (location != null)
{
double pLat = location.getLatitude();
double pLong = location.getLongitude();
long pTime = location.getTime();
DecimalFormat df = new DecimalFormat("#.######");
textLat.setText(df.format(pLat));
textLong.setText(df.format(pLong));
textTimex.setText(Long.toString(pTime));
//textTimex.setText(Long.toString(pTime));
//textTimex.setText(df.format(pLong));
}
}
#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
}
}
I am taking code from examples on the web and none of them work. Here is one
#Override
public void onPause() {
lm.removeUpdates(locationListener);
super.onPause();
}
It really doesn't matter what I call lm, it gives an error that it cannot resolve it. It doesn't matter which example code I use, none of them are error free.
I must be doing something very simply stupid...

declare locationListener globally(outside from onCreate method of Activity) as:
LocationListener ll;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
////your code...
ll = new mylocationlistener();
////your code..
}
#Override protected void onPause()
{
super.onPause();
// TODO Auto-generated method stub
System.out.println("a intrat in onPause()");
if(lm != null) {
lm.removeUpdates(ll);
}
ll = null;
lm = null;
}

The variables you are trying to use are just visible in the scope of onCreate. You need to use a member variable.
You need into your class a:
protected LocationListener ll;
protected LocationManager lm;
Then you just need to remove the LocationListener before your ll and use ll into your onPause code. And the same for lm and the type LocationManager.
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textLat = (TextView)findViewById(R.id.textLat);
textLong = (TextView)findViewById(R.id.textLong);
textTimex = (TextView)findViewById(R.id.textTimex);
lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE);
ll = new mylocationlistener();
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, ll);
}

Sending location to emulator

I am testing the option to send coordinates to the Android Emulator using the Built in Eclipse tool.But it doesn't seem to receive them.I have this simple code:
public class Main extends MapActivity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MapView view = (MapView) findViewById(R.id.themap);
view.setBuiltInZoomControls(true);
final MapController mp = view.getController();
LocationManager manager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
LocationListener listener = new LocationListener() {
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
public void onLocationChanged(final Location location) {
// TODO Auto-generated method stub
mp.setCenter(new GeoPoint((int)location.getLatitude(), (int)location.getLongitude()));
}
};
manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, listener);
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
I have the permissions for ACCESS_FINE_LOCATION and INTERNET in the Manifest.
If someone has any explanation I would be grateful.

Did you add
<uses-library android:name="com.google.android.maps" />
to the application tag in the manifest?
You also need a MD5 Fingerprint of the SDK Debug Certificate from Google to receive Google Maps data. You can get it here.
Try to put a breakpoint inside the onLocationChanged method and see if it stops when sending the location command to the emulator. this should also work when you don't have a certificate yet.

This works for me.
Listener implementation...
public class MyLocationListener implements LocationListener {
public static final String TAG = "MyLocationListener";
private Context context;
public MyLocationListener(Context c) {
this.context = c;
}
public void onLocationChanged(android.location.Location location) {
Log.d(TAG,"LocationChanged: Lat: "+location.getLatitude()+" Lng: "+location.getLongitude());
}
}
Usage...
MyLocationListener locationListener = new MyLocationListener(this);
// Acquire a reference to the system Location Manager
LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
// Register the listener with the Location Manager to receive location updates
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,locationListener);

Android Location in background

i'm new in java/android app and i'm creating an app that uses user-location. I want the location to be updated at the begining of the app.
The problem is that my location class is an activity and i don't want to show another contentview for this class.
Actually, i want the location thing to be done in background, without changing the UI, in a separated class.
Is it possible? How?
Thanks :P

There is no need to put the location in a different activity, the LocationManager already does it in the background:
public void getLocation(){
lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
gpsLocationListener = new LocationListener() {
#Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
#Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
#Override
public void onLocationChanged(Location location) {
//do something with the new location
if (location != null)
gpsLocation = location;
}
};
gpsLocation = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1, 0, gpsLocationListener);
}

Using the LocationManager you should be able to use what ever kind of activity (or service) you want.