[]Geolocation.watchPosition

Geolocation.enableHighAccuracy = true;
this.gps_handler = Handler.create(this, this.update_gps);
this.failed_handler = Handler.create(this, this.gps_failed);
this.watch_id = Geolocation.watchPosition(this.gps_handler, this.failed_handler);
this.gps_handler 只会回调一次吗