Getting Started with Android (17) Preferences 17.3 Modifying the default name of a preference file

On my device, the default preference name is Net.manoel.UsingPreferences_preferences.xml, which is prefixed with the name of the package. However, it is also useful to define a special name for a preference item. You can do this in the following way.

public class Apppreferenceactivity extends Preferenceactivity {     
    @Override public 
    void OnCreate (Bundle Savedinstancestate) {     
        super.oncreate (savedinstancestate);     
                 
        Preferencemanager prefmgr = Getpreferencemanager ();     
        Prefmgr.setsharedpreferencesname ("apppreferences");     
         
        ---Load the preferences from a XML file---     
        addpreferencesfromresource (r.xml.myapppreferences);     
    }     
}

Here, we use the Preferencemanager class to set the preference file's name as Apppreferences.xml.

At the same time, modify Usingpreferencesactivity.java this class.

The public class Usingpreferencesactivity extends activity {/** called the "when" is the "     
        @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);     
    Setcontentview (R.layout.main); public void Onclickload (view view) {Intent i = new Intent ("Net.manoel.AppPreferenceActi     
        Vity ");     
    StartActivity (i);     
                public void Onclickdisplay (view view) {/* Sharedpreferences appprefs = Getsharedpreferences ("Net.manoel.UsingPreferences_preferences", mode_private     
        );     
         
        * * Sharedpreferences appprefs = getsharedpreferences ("apppreferences", mode_private);     
    DisplayText (appprefs.getstring ("Edittextpref", ""));     
        public void onclickmodify (view view) {/* Sharedpreferences appprefs = getsharedpreferences ("Net.manoel.UsingPreferences_prefere    
        NCEs ", mode_private);     
                 
        * * Sharedpreferences appprefs = getsharedpreferences ("apppreferences", mode_private);     
        Sharedpreferences.editor prefseditor = Appprefs.edit (); Prefseditor.putstring ("Edittextpref", (edittext) Findviewbyid (r.id.txtstring)). GetText (). ToString ()     
        );     
    Prefseditor.commit (); } private void DisplayText (String str) {Toast.maketext (Getbasecontext (), str, toast.lengt     
    H_long). Show (); }     
         
}

When we return to the application and modify the preferences, we see that the Apppreferences.xml file has been created.