eehouse wrote: > Are there any scenarios on Android where a process can be instantiated > (classes loaded, etc.) and a non-main activity launched without going > through the main activity?
Sure. The process may have been terminated to reclaim memory, then reconstituted when the user, say, BACK-buttons to the activity. Mutable static data members should be avoided where possible, used in a very transient fashion if needed, or at most used as a non-essential cache. > Background: my app has a single main activity > (android:name="android.intent.action.MAIN" and > android:name="android.intent.category.LAUNCHER"), some secondary > activities, and a preferences class providing static methods meant to > be called from anywhere. These static methods' implementations > require a Context, and so the class has a static Context member > s_context; the static methods assert that s_context is non-null before > using it. That is supremely dangerous, as you can introduce a substantial memory leak. Not to mention it is causing the problem you are experiencing. Please just pass in a Context to the static helper methods. > The very first thing I do in my main activity's onCreate() > method is pass getApplicationContext() into the preferences class so > it can set s_context. See above, plus there is no need to use getApplicationContext() ever, hardly. An Activity is a Context. A Service is a Context. > The main activity launches a secondary activity that calls the > preference class's static methods. Sometimes -- never in an emulator, > and only after my app's been running for a while and moved to the > background several times -- those asserts fail. This is not surprising. Please just pass in a Context to your static helper methods. -- Mark Murphy (a Commons Guy) http://commonsware.com | http://github.com/commonsguy http://commonsware.com/blog | http://twitter.com/commonsguy Android Online Training: 21-25 June 2010: http://onlc.com -- 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
