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I am using a PreferenceActivity to let the user set some values. I am feeding it the xml file with the defined preferences. I have set all the android:defaultValue="" for them. When I start my application, I need the preferences, or if they are not set yet manually, I want the default values: SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this); boolean value = prefs.getBoolean("key"), false); However, when android:defaultValue="true" I still get false . So, it looks like the defaultValues set in the XML are not used anywhere but when initializing the preferences

I am learning Java recently, and I came across the notion of package-private classes, which is the default if we don't specify anything. But then I realized: I seldom see the use of package-private class. Is there a reason for this, e.g., it has serious drawbacks, it is redundant, or simply I am not reading enough? Are there strong arguments for/against its usage? If it is really not useful in most cases, why would it be the default? In what situation should we use package-private in the real world? I.e., when would it become irreplaceable? In other words, what are the major pros and cons of

I am creating a form in the following manner: $form = $this->createFormBuilder($breed) ->add('species', 'entity', array( 'class' => 'BFPEduBundle:Item', 'property' => 'name', 'query_builder' => function(ItemRepository $er){ return $er->createQueryBuilder('i') ->where("i.type = 'species'") ->orderBy('i.name', 'ASC'); })) ->add('breed', 'text', array('required'=>true)) ->add('size', 'textarea', array('required' => false)) ->getForm() How can I set a default value for the species listbox? Thank you for your response, I apologise, I think I should rephrase my question. Once I have a value that I

This question already has an answer here: How do I expire a PHP session after 30 minutes? 13 answers Do PHP sessions timeout by default - ie without any coding on my part would a user eventually be "logged out" after some time of inactivity? Niet the Dark Absol It depends on the server configuration or the relevant directives session.gc_maxlifetime in php.ini . Typically the default is 24 minutes (1440 seconds), but your webhost may have altered the default to something else. You can change it in you php-configuration on your webserver. Search in php.ini for session.gc_maxlifetime() The value

Is it possible to have default arguments in Matlab? For instance, here: function wave(a, b, n, k, T, f, flag, fTrue=inline('0')) I would like to have the true solution be an optional argument to the wave function. If it is possible, can anyone demonstrate the proper way to do this? Currently, I am trying what I posted above and I get: ??? Error: File: wave.m Line: 1 Column: 37 The expression to the left of the equals sign is not a valid target for an assignment. simon There isn't a direct way to do this like you've attempted. The usual approach is to use "varargs" and check against the number

In one of my first code reviews (a while back), I was told that it's good practice to include a default clause in all switch statements. I recently remembered this advice but can't remember what the justification was. It sounds fairly odd to me now. Is there a sensible reason for always including a default statement? Is this language dependent? I don't remember what language I was using at the time - maybe this applies to some languages and not to others? Switch cases should almost always have a default case. Reasons to use a default 1.To 'catch' an unexpected value switch(type) { case 1: /