I just try to invoke the method and make sure their functions, so it's weird when I got null when invoked getDialog() I'll try as you said in inner screen later and post the result here. Thanks 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! > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
