Romain Guy wrote: >> When you open the AlertDialog, the row in the ListActivity is no longer >> selected. I'd argue this is a bug -- opening a dialog should not affect >> the state of the underlying activity -- but there might be a good reason >> the Android team did it this way. > > It is not a bug. There is only one selection/focused widget on screen > at a time. Opening a dialog makes the underlying window loses the > focus, and when a window doesn't have focus, it does not contain any > selection or focused widget.
The problem, though, isn't so much that "it does not contain any selection", is that you positively get rid of the selection, thereby changing the state. For example: -- Have a ListActivity with an option menu choice that displays a dialog -- User selects a row in the list -- User opens and closes the option menu -- the row is still selected -- User opens the option menu and chooses the option that displays a dialog, then cancels out of the dialog, with no code that modifies the list contents -- the row selection is gone By doing this, you're delegating the Principle of Least Surprise to the developer, since the user would not expect, for a no-change set of actions, to have to re-select the row. And the developer's own Principle of Least Surprise has failed, as the activity loses just as much focus when the option menu is displayed as when the dialog is displayed, yet the results differ -- in one case, UI state remains intact; in another case, UI state is altered. Moreover, onSaveInstanceState() is not called before a dialog is popped over the activity, meaning we have to roll our own state-saving logic to deal with any state the act of popping a dialog will reset. Are you *sure* this is the correct behavior? -- Mark Murphy (a Commons Guy) http://commonsware.com Warescription: All titles, revisions, & ebook formats, just $35/year --~--~---------~--~----~------------~-------~--~----~ 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] Announcing the new Android 0.9 SDK beta! http://android-developers.blogspot.com/2008/08/announcing-beta-release-of-android-sdk.html For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
