Hi all,
I need your help to have a clarification for the preferences framework of 
Android.

Accordingly to Google API Reference 
(http://developer.android.com/reference/android/preference/PreferenceActivity.html)
 
I created my app preferences section by extending the PreferenceActivity 
class and by creating (sub)fragment for each different sections. It seems 
works well, but here is the first question:
  1. Google API documentation talks about 2 "styles" for creating 
preference sections of an app: one "deprecated" old style, and one "newest" 
technique fragment-based. As per my understanding, with the first "old" 
method, all the settings belong to only one "screen", instead with the 
second it is possibile to create headers and subsection for grouping the 
settings. BTW, always for google gudelines, it is not a "best practice" to 
spread the setting into several section 
(http://developer.android.com/design/patterns/settings.html). So the 
question is, what of this two "techniques" is better to use? What is the 
criteria (for example number of settings...) to choose one or the other 
solution?

Then, assuming that i've choosen one of the technique and have implemented 
my preference section in my app, i know that all the settings are managed 
by Android with SharedPreference class. Now, I need to access to my 
settings outside the my PreferenceActivity class. I thought to work in this 
way: in my main Application class, I create a static method that, using the 
context of the app, accesses to the SharedPreferences object, retrive the 
setting I ask for, and return its value to the caller. But, the 
getSharedPreferences Context's method ask me for a "name" and a "mode". 
Accordingly to API reference "name" is "Desired preferences file" and 
"mode" is the "Operating mode". The question is:
  2. How can I know what is the preference file for my application, as was 
the Android framework that managed the preferences for me (within my 
PreferenceActivity class)?

Thanks a lot for all the clarification
Regards
Sergio

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