Re: [android-developers] improving gps lock time
Looks like AGPS uses WIFI and cell-phone tower locations. The problem for my app is that I don't necessarily have access to data service - so AGPS will not work. Even though I want to do want AGPS does - i.e. provide a start location for getting satellite queries. But my understanding is that API is not available. The real problem I have is that I allow users to shut the screen off to save batteries and I stop the gps listeners. Then onResume(), I enable the listeners - and it's here where the lock time is too much. Option #2. How about I NOT disable the listeners on onPause() - but set the listener to every minute. I would think that would help maintain the lock. It would save the battery with the screen off. and maybe some batteries wiith the gps being queried less often now. not sure of the latter though. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [android-developers] improving gps lock time
AGPS does NOT use wifi and cell tower locations. http://en.wikipedia.org/wiki/Assisted_GPS On Sunday, March 10, 2013 8:33:05 AM UTC-4, dashman wrote: Looks like AGPS uses WIFI and cell-phone tower locations. The problem for my app is that I don't necessarily have access to data service - so AGPS will not work. Even though I want to do want AGPS does - i.e. provide a start location for getting satellite queries. But my understanding is that API is not available. The real problem I have is that I allow users to shut the screen off to save batteries and I stop the gps listeners. Then onResume(), I enable the listeners - and it's here where the lock time is too much. Option #2. How about I NOT disable the listeners on onPause() - but set the listener to every minute. I would think that would help maintain the lock. It would save the battery with the screen off. and maybe some batteries wiith the gps being queried less often now. not sure of the latter though. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [android-developers] improving gps lock time
If the GPS has been on and the user turns off the screen, there's nothing you can do to really get a better approximation to location. Let's be realistic here: how accurate does your signal need to be? If it's pinpoint accuracy (within 60-200 m) then you should be getting constant fixes anyway. If it's not, then why is fixing the results of the output so bad? If you want a good trade off, I'd say to set up an alarm manager that requests location fixes at a coarse interval. Kris On Sun, Mar 10, 2013 at 8:33 AM, dashman erjdri...@gmail.com wrote: Looks like AGPS uses WIFI and cell-phone tower locations. The problem for my app is that I don't necessarily have access to data service - so AGPS will not work. Even though I want to do want AGPS does - i.e. provide a start location for getting satellite queries. But my understanding is that API is not available. The real problem I have is that I allow users to shut the screen off to save batteries and I stop the gps listeners. Then onResume(), I enable the listeners - and it's here where the lock time is too much. Option #2. How about I NOT disable the listeners on onPause() - but set the listener to every minute. I would think that would help maintain the lock. It would save the battery with the screen off. and maybe some batteries wiith the gps being queried less often now. not sure of the latter though. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [android-developers] improving gps lock time
On Sat, Mar 9, 2013 at 12:28 PM, dashman erjdri...@gmail.com wrote: is there any way to initialize the LocationManager gps provider with a starting point for the lock - i.e. a lat/lon geo pos to start at. No, and that wouldn't speed things up anyway. There's nothing stopping you with starting your own app with some pre-determined Lat / Lon location and estimated accuracy while you wait for the actual lock. - TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [android-developers] improving gps lock time
Although having some idea of where the device is lowers cold start times, there's not a direct API for specifying where you think the user might be. Kris On Sat, Mar 9, 2013 at 2:29 PM, TreKing treking...@gmail.com wrote: On Sat, Mar 9, 2013 at 12:28 PM, dashman erjdri...@gmail.com wrote: is there any way to initialize the LocationManager gps provider with a starting point for the lock - i.e. a lat/lon geo pos to start at. No, and that wouldn't speed things up anyway. There's nothing stopping you with starting your own app with some pre-determined Lat / Lon location and estimated accuracy while you wait for the actual lock. - TreKing - Chicago transit tracking app for Android-powered devices -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [android-developers] improving gps lock time
ok - maybe there's other methods. i've seen apps decrease lock time by contacting NTP servers. Also apparently assisted gps helps - assisted gps just gets a wifi geo location - and just using that helps. i have a geo location also. i'm sure gps lock speeds can be decreased if you have an approx geo location...and maybe the precise time - i.e. know the sat positions etc. but maybe there's no public api for this - internally looks like android uses AGPS to speed up lock. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: [android-developers] improving gps lock time
AGPS doesn't use WiFi. It uses precomputed Almanac/Ephemeris data so the GPS receiver has a better idea which satellites to expect, and where. That data needs to be refreshed every x days (usually 3 to 7), and is injected into the GPS receiver management software. I don't think that software is exposed to Android. On Saturday, March 9, 2013 8:10:05 PM UTC-5, dashman wrote: ok - maybe there's other methods. i've seen apps decrease lock time by contacting NTP servers. Also apparently assisted gps helps - assisted gps just gets a wifi geo location - and just using that helps. i have a geo location also. i'm sure gps lock speeds can be decreased if you have an approx geo location...and maybe the precise time - i.e. know the sat positions etc. but maybe there's no public api for this - internally looks like android uses AGPS to speed up lock. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
RE: [android-developers] improving gps lock time
Using the AGPS (wifi rather than Sat) will speed up the process a lot but less accurate. In most cases if going off a home wifi it is pretty accurate for me. I also notice if the user is OUTSIDE and the phone is not in the pocket the speed for SAT is pretty good (expect on my 1st gen droid and some other offshoots of the Moto Droid) You could grab the AGPS location during a splash screen and query the accuracy. If it is over X amount ( X being what you determine for meters) then you can call up the SAT service for the user. From: android-developers@googlegroups.com [mailto:android-developers@googlegroups.com] On Behalf Of dashman Sent: Saturday, March 09, 2013 8:10 PM To: android-developers@googlegroups.com Subject: Re: [android-developers] improving gps lock time ok - maybe there's other methods. i've seen apps decrease lock time by contacting NTP servers. Also apparently assisted gps helps - assisted gps just gets a wifi geo location - and just using that helps. i have a geo location also. i'm sure gps lock speeds can be decreased if you have an approx geo location...and maybe the precise time - i.e. know the sat positions etc. but maybe there's no public api for this - internally looks like android uses AGPS to speed up lock. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out. -- -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en --- You received this message because you are subscribed to the Google Groups Android Developers group. To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
