Question

I’ve got an activity, where I initialize some static variable (Menu of the app). In another activity I use these variable in some if-clauses.

If I am in the 2nd activity and press “Home” button to get the app to the background and resume it after a few minutes or immediately the app will still work. If I wait for about 10 minutes before resumeing it crashs.

The smartphone I was using has got many widgets and apps, which will refresh automatically. Because of that I think the variable got deleted from the memory, because it gets full. If I resume the app will crash at a point, where I am just using an if-clause like:

if(couldBeTrue){
//do something
}

I can’t conceive to another idea which could cause this problem.

Do you think my assumption is correct? What is the best way to debug it?

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Edit:
I am sorry for the poor information. I give it another try.

I’ve got 3 Class:

OpenFeintApp extends Application:
starts everytime I start or resume the App (only contains variable and some code for OpenFeint)

MenuActivity extends Activity:
This activity is the launcher activity. Contains the needed static variable. Those variable are for settings. And there are some final static variable, which I change to be able to export different versions easily.

public final static boolean EXTRA_CONTENT_ONE = false;
public final static boolean EXTRA_CONTENT_TWO = true;
public final static boolean EXTRA_CONTENT_THREE = false;

public static int SETTINGS_ONE = 3;
public static int SETTINGS_TWO = 0;
public static int SETTINGS_THREE = 1;
public static int SETTINGS_FOR = 5;

(will not be called if I resume the app after I pause the app while playing in GameActivity)

GameActivity extends Activity (AdMob integrated):
Won’t crash after resume if I resume after a few minutes. (Galaxy S, which refresh pretty much things automatically) Will crash if I pause this activity and resume it after about 10 minutes. Before this activity resumes OpenFeintApp will be called.

I got a NullPointerException at this point:

if (MenuActivity.EXTRA_CONTENT_ONE) //This variable is false

Answer 1

Instead of using the public static of a member variable in your Activity you should consider the use of global variables. In this way your variables will remain as long as your application is alive.