try usin the time tick event instead of systime... u cud keep track of the time ticks elapsed... since u said couple of minutes:
" I'm trying to check the age of a GPS fix, so that I can discard location fixes that are more than, say, a couple of minutes old - I need my fix to be very accurate. " have a look at this: http://developer.android.com/reference/android/content/Intent.html#ACTION_TIME_TICK this is jus a round abt method... hope it helps. cheers! On Tue, Jul 21, 2009 at 3:52 PM, Anna PS <[email protected]>wrote: > > Hi all > > Just updating this thread, which seems to be too old for me to post a > follow-up: > http://groups.google.com/group/android-developers/browse_thread/thread/df1e14fe4e9ad896/ > > I'm trying to check the age of a GPS fix, so that I can discard > location fixes that are more than, say, a couple of minutes old - I > need my fix to be very accurate. This is the code I use: > > long locationTime = location.getTime(); > long currentTime = System.currentTimeMillis > (); > timeDifference = (currentTime - > locationTime) / 1000; > if (timeDifference > 120) { > // warn the user > } > > However, this method is entirely dependent on the user having set > their system time correctly. If they are just a few minutes out (and > lots of people do like to keep their clocks a few minutes fast) then > they will only ever get warned. > > I don't know what to do - I can't accept location data that's > potentially out of date, nor can I rely on my users to have correct > system time within a couple of minutes. The problem is that there is > no way to check the age of the GPS data itself, just the time > (location.getTime() returns the UTC time, rather than the the age, of > the data). > > Is there any way around this? I guess I could check the locationTime a > few times in succession and see if it changes, and assume that if it > changes then it must be getting updated, but it feels kind of fiddly. > > Thanks > Anna > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
