I've never tried java.util.Preferences on Android, but android.content.SharedPreferences has been working great. The official example uses Boolean, but it supports Long as well: http://developer.android.com/intl/fr/guide/topics/data/data-storage.html#pref
On Sep 25, 6:10 am, leden <[email protected]> wrote: > Hi all! > My app needs to save its state before being killed, and since that > state is really small (one Long), I've decided to use > java.util.Preferences. I use it like the way I would be using in any > Java application (and never had problems), though I am not sure this > is the correct way here on Android platform: > private static final Preferences prefs = Preferences.userNodeForPackage > (WordChoice.class); > > I update preferences in onPause() method, to ensure that data is > always persisted no matter how my app ends: > Here is that fragment of code: > protected void onPause() { > super.onPause(); > prefs.putLong("currIndex", somePositiveValue); > > } > > Everything works perfectly on emulator, but when I install my app onto > my g1 phone, the preferences doesn't work the way they are supposed to > work - it seems that SOMETHING clears them every time my application > is killed. > Here is the example of output of my application: > (FIRST STARTUP) > no entry found for currIndex > (STOPPED) > (STARTUP) > currIndex = 25 > (STOPPED) > (STARTUP) > currIndex = 83 > (KILLED i.e. from ASTRO or via terminal-emulator or killed by system) > (STARTUP) > no entry found for currIndex <-- what the ...?? > > I really don't understand this behavior. I also tried flushing the > preferences but doesn't help. > Then I changed the code in onPause() method so that it first persists > data then calls super.onPause() but then the even worse scenario > occurs - preferences are cleared on random (about 50% to be cleared) > no matter how my app ends. > > Please help me by giving, I have already spend a few hours struggling > with this issue with no success. > I would be grateful if someone posted an example of how to permanently > store that a single "Long" and how retrieve it, so that it works when > an application is killed. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
