无法在Android移动设备上获取位置

Question

Actually my problem is sometimes i can get the location and sometimes i can't get the location on Android real device. I used following code for getting the location,

LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(false);
criteria.setBearingRequired(false);
criteria.setPowerRequirement(Criteria.POWER_LOW);
String provider = locationManager.getBestProvider(criteria, true);
Location location = locationManager.getLastKnownLocation(provider);

I need to get the location when my application starts up. I don't know why sometimes it fails. How to resolve this issue?

Answer 1

@jsmith commented on my quesion,

Increase your power requirements and make sure you test where you can get a network or gps signal. If that helps, then it's simply a case of the sensors not getting enough reception to know the location.

This is the right answer for my question. Now its working fine.

Answer 2

You forgot to request for 'Location Updates', use this function after declaring the LocationManager :

locationManager.requestLocationUpdates(provider, 0, 0, this);

and you have to let the class implements LocationListener then add this function:

public void onLocationChanged(Location location) {
//get the location here
}

If you don't want to get the location repeatedly, after you get the location you have to stop the 'Location Updates' this way:

locationManager.removeUpdates(this);

in case you want the application always listen for the 'Location Updates', you better request for updates in onResume() and remove the updates in onPause() & onDestroy()

Good Luck