> > The original question was regarding AlertDialog.show() vs. AlertDialog.showDialog(), and not involving Activity.showDialog()
which has no corresponding .show(). I think it was AlertDialog.show() vs Activity.showDialog(int), since he says: If you don't call .show and use showDialog from the activity ... Plus, there is no AlertDialog.showDialog() ... > this seems to imply that the answer to his original question is that it's *never* safe to call AlertDialog.show() because you can never be sure that the user won't change orientation while the dialog is shown. It is safe to use AlertDialog.show() if you're keeping a reference to the dialog and will take care of dismissing it / re-showing it as necessary when the Activity is destroyed / restarted. This is essentially what the Activity does for you. Unless you have a good reason not to, just stick with showDialog(int) and let it do the work for you. ------------------------------------------------------------------------------------------------- TreKing - Chicago transit tracking app for Android-powered devices http://sites.google.com/site/rezmobileapps/treking On Sat, Jan 9, 2010 at 2:20 PM, Coco <[email protected]> wrote: > Great answer, Sean. Thanks. > The original question was regarding AlertDialog.show() vs. > AlertDialog.showDialog(), and not involving Activity.showDialog() > which has no corresponding .show(). Assuming that these services share > implementations, this seems to imply that the answer to his original > question is that it's *never* safe to call AlertDialog.show() because > you can never be sure that the user won't change orientation while the > dialog is shown. More likely is that I'm just missing something here > but I just spend a few hours struggling with alert dialogs so it sure > would be great to see a good simple example of how to safely use them. > > -Melinda > > On Jan 8, 9:55 am, Sean Hodges <[email protected]> wrote: > > When you use Activity.showDialog() you are telling the parent activity > > to manage the dialog that you create. > > > > From the API docs ( > http://developer.android.com/intl/fr/reference/android/app/Activity.h...) > > ): > > "A call to onCreateDialog(int) will be made with the same id the first > > time this is called for a given id. From thereafter, the dialog will > > be automatically saved and restored." > > > > When you rotate the phone, your parent activity is closed and > > re-created. The showDialog() method tells the activity to > > automatically re-create the AlertDialog as well. > > > > When you use AlertDialog.show(), you are effectively managing the > > dialog yourself. This means that when the activity is closed and > > re-created, you would have to make sure the dialog is dismissed and > > displayed correspondingly; otherwise the activity *may* be destroyed > > before the dialog has chance to close, and the internal reference to > > it will be flagged as leaked. > > > > On Fri, Jan 8, 2010 at 5:15 PM, Michael Dorin <[email protected]> > wrote: > > > When creating an AlertDialog...I have noticed in some cases, if you > > > invoke .show directly, you > > > get a leaked dialog error when you rotate the phone. > > > In other cases you don't. > > > > > If you don't call .show and use showDialog from the activity you don't > > > see the leaked dialogs. > > > Are there some cases when you can use .show? > > > > > Or is it just dumb luck if you don't see a problem? > > > > > -Mike > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Beginners" group. > > > > > NEW! Try asking and tagging your question on Stack Overflow at > > >http://stackoverflow.com/questions/tagged/android > > > > > To unsubscribe from this group, send email to > > > [email protected]<android-beginners%[email protected]> > > > For more options, visit this group at > > >http://groups.google.com/group/android-beginners?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Beginners" group. > > NEW! Try asking and tagging your question on Stack Overflow at > http://stackoverflow.com/questions/tagged/android > > To unsubscribe from this group, send email to > [email protected]<android-beginners%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-beginners?hl=en > >
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