It will return the first it finds during a depth-first traversal of the hierarchy. The framework uses framework ids -- 0x01nnnnnn. It is up to you to generate unique id integers (if you aren't using @id/blah) however you would like, if needed. There is no requirement for ids to be unique in a view hierarchy -- for example items in a list view are from the same view hierarchy with the same ids, and this is fine even if they use a relative layout. On Dec 27, 2010 11:22 AM, "John Lussmyer" <[email protected]> wrote: > Well, things just aren't quite working that way. > I had 2 instances of my custom view (subclass of RelativeLayout) on screen. > Each of these did have a unique ID number. > When the children of my view all used the same set of ID numbers > (900,901,902 for the 3 children of the custom view), then when the main app > code called a custom.setValue() method - which just passed the given string > on to one of the children childTextView.setText() - it was updating the > WRONG instances child. (which seemed really weird, since I had the TextView > object reference directly from when I programmatically created it.) > I modified the code so that every instance used a different set of child ID > numbers, and this problem went away. > > I can hope that the numbers I chose won't conflict with some other custom > control someday, but if the main app calls findViewById(), and that id > occurs in both my custom control, and some view that the app defined in > their XML, which will it find? > > On Mon, Dec 27, 2010 at 9:49 AM, Bret Foreman <[email protected] >wrote: > >> The view ID is intended to be used inside the scope of an onClick() or >> some other onEvent() method. In that case, the onEvent method was set >> in the initialization for the widget, which will be unique to your >> widget. In other words, it's always one of your custom widgets. I >> wouldn't use a view ID outside that scope. >> >> > > -- > 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]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en
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