Proper use of these classes and their methods will improve your programs.
适当地使用这些类及其包含的方法能够改善程序。
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One of the most important classes to represent tree view information is a content Provider class, which is responsible for providing the proper content to the tree viewer.
Developers must use a proper packaging structure (such as custom namespace mapping while generating objects from WSDL) while creating these objects to avoid overwriting existing classes.