Question

in the following code:

public class ApplicationContext extends Application
{

    private static ApplicationContext instance;

    public ApplicationContext()
    {
        instance = this;
        final String strID = Secure.getString(getContentResolver(), Secure.ANDROID_ID);
    }

    public static Context getContext()
    {
        return instance;
    }
}

getContentResolver() causes a NullPointerException. Why ?

I find this exception especially confusing because Google states “You get a ContentResolver by calling getContentResolver() from within the implementation of an Activity or other application component”

http://developer.android.com/guide/topics/providers/content-providers.html

Answer 1

Do this when overriding oncreate better than in your constructor. I guess your app doesn’t have a context yet.

Actually, here is what I did yesterday for some LVL code :

/** Called when the activity is first created. */

@Override
public void onCreate() {
    super.onCreate();
    LICENSED_APP_ID = Secure.getString(getContentResolver(), Secure.ANDROID_ID); 
}//cons

And it works like a charm…