Stu wrote:
> Hi, I seem to be struggling with the concept of Context in Android
> when dealing with the application preferences.
>
> I have an application with a few different classes. I need to be able
> to get the value of one of the preferences from a class that is not my
> main class, but I can't seem to get it working at all.
>
> I get a NullPointerException with the following (as well as about a
> hundred other variations):
>
> final SharedPreferences prefs =
> PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
> final boolean increasing = prefs.getBoolean("preference_name",
> false);
>
> Am I doing something completely stupid?
Activity is a Context.
Service is a Context.
Anything on which you can call getApplicationContext() is a Context.
Hence, get rid of your call to getApplicationContext() and replace it
with "this" (minus the quotes).
Only use getApplicationContext() when you specifically and absolutely
need an Application object.
> Is there an example app
> that anyone can think of that might be helpful?
For SharedPreferences, try:
http://github.com/commonsguy/cw-android/tree/master/Prefs/Dialogs/
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
_The Busy Coder's Guide to Android Development_ Version 3.0
Available!
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