Android Learning Note (i) interface programming for--android applications

1. Android provides a rich set of UI components, all of which are inherited from the view class , and the view component is very similar to the swing programming JPanel, which represents a blank rectangular area.

2. Android uses the "combo" design pattern to Design view and ViewGroup:ViewGroup is a subclass of view, so viewgroup can also be used as a view .

3. Instead of using Java code to develop the user interface, Android recommends using an XML layout file to define the user interface. using an XML layout file to control the view is not only straightforward, but it can also be used to separate logical views from Java code into XML files to better reflect the MVC principle .

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Android Learning Note (i) interface programming for--android applications