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.
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