how do i create the options menu for the child preference screen ? On Feb 10, 8:33 am, robert <[email protected]> wrote: > Dear Christoph > I got the non-null return from inner screen, just like you said, > thanks a lot for your help! > > On Feb 10, 10:27 am, Christoph Studer <[email protected]> wrote: > > > From the code > > here:http://android.git.kernel.org/?p=platform/frameworks/base.git;a=blob;... > > it looks like mDialog is only valid when that particular (inner) > > PreferenceScreen is shown, i.e. when you see the contents of that > > PreferenceScreen. So it the return value of getDialog() is depending > > on when exactly you call it. > > > What is it exactly you want to achieve after accessing the dialog? > > > On Tue, Feb 10, 2009 at 3:11 AM, robert <[email protected]> wrote: > > > > Dear Christoph > > > Thanks for ur reply:) > > > I've tried as you said and I got the concept of the structure.But > > > there is still a problem when I use the getDialog() method. > > > I found that the return of this method is null when using it in my > > > program but not null when I use ddms to debug and check the mDialog, > > > and the mDialog is just set null in onDismiss() method, but ddms can't > > > go into this method at running time, so I'm not sure whether this > > > mDialog is the reference of the inner PreferenceScreen and can we get > > > it by getDialog(), this is the annotation of getDialog() : ' Used to > > > get a handle to the dialog. This is useful for cases where we want to > > > manipulate the dialog as we would with any other activity or view.' > > > > On Feb 10, 9:53 am, Christoph Studer <[email protected]> wrote: > > >> When the PreferenceActivity encounters nested PreferenceScreens in the > > >> hierarchy, it will add the inner PreferenceScreen as a list entry > > >> (similar appearance as e.g. for a EditTextPreference) to the outer > > >> PreferenceScreen. When the user clicks on this list entry, the > > >> contents of the inner PreferenceScreen will be shown. > > > >> If this explanation does not make sense to you, just open Settings on > > >> your phone. You can imagine all the entries shown on that screen > > >> ("Wireless controls", "Call settings" etc.) being inner > > >> PreferenceScreens of the main PreferenceScreen. When you click on an > > >> entry, the contents of that particular inner PreferenceScreen will be > > >> shown. > > > >> I think the "Dialog" refers to the new - automatically generated - > > >> screen that is shown when you click on the list entry and drill down > > >> into the inner PreferenceScreen. It doesn't really look like a dialog, > > >> but that's probably what it is. (As an alternative, the inner > > >> PreferenceScreen could specify an activity intent that is fired when > > >> the user clicks on its list entry.) > > > >> Christoph > > > >> On Tue, Feb 10, 2009 at 2:00 AM, robert <[email protected]> wrote: > > > >> > Hi All: > > >> > When I see the doc of Preference Screen, there is one paragraph > > >> > about the sub-preference screen related to dialog, the doc is as > > >> > follow: > > >> > ---> When it appears inside another preference hierarchy, it is > > >> > shown and serves as the gateway to another screen of > > >> > preferences (either by showing another screen of preferences as a > > >> > Dialog or via a Context.startActivity(android.content.Intent) from the > > >> > Preference.getIntent()). The children of this PreferenceScreen are > > >> > NOT shown in the screen that this PreferenceScreen is shown in. > > >> > Instead, a separate screen will be shown when this preference is > > >> > clicked. > > >> > But in Android Api Demo, the Preference from code, I find nothing > > >> > related to Dialog when using PreferenceScreen as the base element of > > >> > preference, and I have no idea about 'showing another screen of > > >> > preferences as a Dialog', what does it mean? Is there a pop-dialog > > >> > when we click anywhere in Preference Screen? But the Preference Screen > > >> > is invisible. So I wanna know if there is any suggestion about my > > >> > question, and thanks in advance!
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