[android-developers] Re: Can GPS work without internet access in Android phone?

Hi, Kristopher,

Thank you for your reply.
Yes, I waited it more than 15 minutes.
And following is my code, I have no idea where's wrong,
please feel free to have a look, and
If you don't mind, please give me some hints
Thank you!

package com.lyodssoft.android.project.gps;

import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Binder;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;

public class GPSService extends Service implements LocationListener {

private Handler requestLocUpdateHandler = new Handler();
private LocationManager locationMgr;
private static int locUpdateTime = 30000;

// Bind for Service Connection
class GPSServiceBinder extends Binder {
GPSService getService() {
return GPSService.this;
}
}

// define ACTION
public static final String ACTION = "GPS Service Broadcast";

@Override
public void onCreate() {
super.onCreate();

locationMgr = (LocationManager)
getSystemService(LOCATION_SERVICE);
requestLocUpdateHandler.postDelayed(requestLocUpdateTask, 1000);
}

private void updateLocStatus(Location loc) {
if (loc != null) {
double latitude = loc.getLatitude();
double longitude = loc.getLongitude();
long locTime = loc.getTime();
String dateTime = Utils.dateFormat.format(locTime);

Log.w("Location Info", loc.getAccuracy() + " | " +
loc.getProvider());
Log.w("GPS", "Time: " + dateTime + " | Lat: " + latitude + " |
Long: " + longitude);
}
}

private Runnable requestLocUpdateTask = new Runnable() {
@Override
public void run() {
requestLocUpdate();
requestLocUpdateHandler.postDelayed(requestLocUpdateTask,
locUpdateTime);
}
};

private void requestLocUpdate() {
locationMgr.removeUpdates(this);
locationMgr.requestLocationUpdates(LocationManager.GPS_PROVIDER,
3000, 0, this);
}

@Override
public IBinder onBind(Intent arg0) {
return new GPSServiceBinder();
}

@Override
public void onRebind(Intent intent) {
}

@Override
public boolean onUnbind(Intent intent) {
return true;
}

@Override
public void onLocationChanged(Location location) {
updateLocStatus(location);
}

@Override
public void onProviderDisabled(String provider) {
}

@Override
public void onProviderEnabled(String provider) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle
extras) {
}

@Override
public void onDestroy() {
super.onDestroy();
locationMgr.removeUpdates(this);
}

@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
}
}

Thanks and Regards,
Kenneth Won

On 10月31日, 上午11時22分, Kristopher Micinski <krismicin...@gmail.com>
wrote:
> Cold starts can take up to 15 minutes...
>
> Did you wait 15 minutes...
>
>
>
>
>
>
>
> On Sun, Oct 30, 2011 at 11:17 PM, Kenneth WON <kenneth...@gmail.com> wrote:
> > Hi, lbendlin,
>
> > Thank you for your reply.
> > I am really facing this issue.
> > When I turn off the Network (WiFi and/or cell network), the app cannot
> > obtain (GPS / A-GPS) position.
> > Then I turn the network on, it can get the (GPS / A-GPS) position
> > successfully.
> > What's wrong?
>
> > Thanks and Regards,
> > Kenneth Won
>
> > On 10月31日, 上午8時30分, lbendlin <l...@bendlin.us> wrote:
> >> GPS can work very well without internet access - after it got the first
> >> fix.  The internet access is used to download satellite position data to
> >> the GPS receiver which speeds up the TTFF (time to first fix).  Without the
> >> extra help the first fix can take quite some time, especially when you are
> >> already moving.
>
> >> Go to a location with unobstructed sky view and let the GPS receiver get a
> >> fix. Then check how it performs on subsequent fixes.
>
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