Android lastKnownLocation returns null

问题

I've got this problem I don't see anything wrong in the code but getLastKnownLocation returns null every time . any ideas ?

public class LocationDemo2Activity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        EditText et1 = (EditText) findViewById(R.id.editText1);

        LocationManager manager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);
        Location location = manager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

        if(location != null)    et1.setText((int)location.getLatitude());
        else et1.setText("null");

    }
}

thanks

回答1:

getLastKnownLocation() will frequently return null, particularly if the location provider (e.g., GPS) has not been used recently. You only use getLastKnownLocation() in situations where you either do not really need a location (but would like to have one) or where you will use other techniques if getLastKnownLocation() returns null (e.g., request location updates).

来源：https://stackoverflow.com/questions/12238290/android-lastknownlocation-returns-null