This is a question which has been asked numerous times but I could not find a solution that always works.
I am developing an application using the Fused location provider.
In the onConnected()
method, I am requesting for location updates and the application logic will be initiated once a location fix is generated and onLocationChanged()
is called. (Please refer to my code below).
Problem onLocationChanged()
method is never called on some devices. I use a Samsung Tab 2 and a Samsung Galaxy Grand for testing. This code works perfectly fine on the Tab 2 but does not work on Grand. By does not work, I mean that locationClient
gets connected but onLocationChanged()
is never called.
Earlier, I used the location manager for getting location and in that implementation, the same problem occurred. So, I tried implementing the fused location provider but I still get the same problem.
Can anyone help me out with this issue? Is there something I am missing here?
public class MainActivity extends Activity implements GooglePlayServicesClient.ConnectionCallbacks, OnConnectionFailedListener, LocationListener {
LocationClient locationclient;
LocationRequest lr;
Location loc1;
static String address;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
locationclient = new LocationClient(this,this,this);
locationclient.connect();
}
@Override
public void onConnected(Bundle arg0) {
// TODO Auto-generated method stub
lr=LocationRequest.create();
lr.setInterval(100);
locationclient.requestLocationUpdates(lr, this);
Log.d("LocationClient","On Connected");
}
@Override
public void onDisconnected() {
// TODO Auto-generated method stub
locationclient.disconnect();
}
@Override
public void onConnectionFailed(ConnectionResult arg0) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location loc) {
// TODO Auto-generated method stub
// Application Logic
Log.d("LocationClient","Last Known Location LC:" + loc.getLatitude() + "," + loc.getLongitude());
}
}
I observed same behavior on Galaxy Nexus and recognized two things causing onLocationChanged()
to not being called. There are
Corresponding location source is not enabled in System Settings. For
PRIORITY_HIGH_ACCURACY
the GPS satellites must be enabled, forPRIORITY_BALANCED_POWER_ACCURACY
Wi-Fi & mobile network location must be enabled.Even for the enabled location sources there can be no valid location information available. For instance,
PRIORITY_HIGH_ACCURACY
source is enabled, but there is no (or not good) GPS reception (e.g. device is inside a building). OrPRIORITY_BALANCED_POWER_ACCURACY
source is enabled, but both Wi-Fi and mobile data are switched off. In those cases location cannot be detected andonLocationChanged()
will not be called.
To fix #1 I had to check whether required location sources are enabled even before connecting to Google Services API and if they are switched off, then I notified a user asked him/her to allow location access.
To solve #2 I decided to use LocationRequest.setExpirationDuration()
. I set timeout at about 10 seconds, and immediately after calling requestLocationUpdates()
I post a callback delayed by same 10 seconds. If delayed callback is called before requestLocationUpdates()
, this means location cannot be detected due to reason #2. I do three retries and then show user an error message.
Android documentation is not great at this place, that's why I hope this helps.
lr.setInterval(100);
with it your interval is 0,1 second so it very hard for gps chipset to detect location. Your interval should be > 1 second.(with me it is > 10)
locationRequest it should be set:
setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
because PRIORITY_BALANCED_POWER_ACCURACY
in outdoor it doesn't get location . Code will look like :
lr=LocationRequest.create();
lr.setInterval(5 * 1000);// 5s
lr.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationclient.requestLocationUpdates(lr, this);
Hope this help.
See if you're getting a passed location by testing for if (loc == null). Even though it's the same provider, maybe one device is coming back null and bombing out, resulting in a look like it's not firing.
This maybe non-sense but I have faced this problem before, someone suggested that you should create your own LocationListener
instead of letting your MainActivity
implements LocationListener
. Basically this:
locationclient.requestLocationUpdates(lr, your_location_listener);
Hope this helps.
I solved this by setting both parameters, minimum distance and minimum time between updates to 0. As per what I have tested on 2 devices, now onLocationChanged() is being called regularly after requesting for updates.
try to remove and reinstall "google play services
". Install it from google market link bellow,
google play services
Here Check this code out...
public class MyActivity extends Activity implements LocationListener {
double destLat, destLong;
LocationManager locationManager;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
destLat = location.getLatitude();
destLong = 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
}
来源:https://stackoverflow.com/questions/18109542/onlocationchanged-not-called-on-some-devices