On Wednesday, July 4, 2012 2:29:56 AM UTC-7, Alex Belyaev wrote: > > I have encountered several issues while extending ListView widget. > According to the sources, we have the following inheritance chain: > > CustomListView<-ListView<-AbsListView<-ViewGroup... > > I'm trying to override layoutChildren() method and here comes the first > issue. After calling super.layoutChildren() program execution comes to > the point, where obtainView() method of the > AbsListView.java<http://grepcode.com/file_/repository.grepcode.com/java/ext/com.google.android/android/2.3.7_r1/android/widget/AbsListView.java/?v=source>abstract > class should be called from > ListView.java<http://grepcode.com/file_/repository.grepcode.com/java/ext/com.google.android/android/4.0.3_r1/android/widget/ListView.java/?v=source>class. > > obtainView() method has default access modifier, as a result, I should > not have an ability to override it in my CustomListView class, since > AbsListView belongs to the different package. But, if I place > obtainView()method in > CustomListView class, it works! So my first question is, why does this > happen? > I think you are mistaken in your understanding of what happens when you define obtainView in the subclass. You, absolutely can create a method with that name. The new method does not override the the base class method, it hides it. The base class method is not visible from the subclass: super.obtainView is a compile error from the new class. Using the @Override tag will help identify problems like this.
> The second question is very similar to the first one. We have two methods ( > attachViewToParent() and addViewInLayout()) in the ViewGroup class. Both > of them have protected access modifier, thus, it is possible to override > them. But if I place this methods in CustomListView class, this doesn't > work for me. > > So the question is, why? > This one I don't understand. That seems like it should work. Can you give more details. G. Blake Meike Marakana The second edition of Programming Android is now on-line: http://shop.oreilly.com/product/0636920023005.do -- 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
