问题:

I am new into Android world. I was just referring this tutorial from Google: http://developer.android.com/training/location/retrieve-current.html

Program compiles fine and launches application on emulator, but when I try to find mLocationClient.getLastLocation() it returns null, ALWAYS

I searched for almost a day and ahve already tried sending parameter from DDMS, telnet, switching google MAPs but still no success.

Please help me out.

回答1:

What eventually worked for me was setting a location (I use Genymotion, so the "GPS widget" in the upper right corner), then starting Google Maps, and then running my app.

My guess is that my app wasn't actually setting the current location (which I thought connecting my locationClient would do automatically) - Google Maps checks and sets the location, so getLastLocation actually has something to return.

回答2:

I think the emulator sometimes has its own bugs and issues. maybe that's one of them.

try the next things:

use the latest version of Android for the emulator. also update the ADT & SDK to the latest versions.
use alternative emulators
use real devices
use fake-gps-apps (location mocking) which make the OS think that your device is in some position
make sure that in the OS settings, mocking of gps locations is enabled