如何开发Piechart

A well-designed custom view is much like any other well-designed class. It encapsulates a specific set of functionality with an easy to use interface, it uses CPU and memory efficiently, and so forth. In addition to being a well-designed class, though, a custom view should: Conform to Android standards Provide custom styleable attributes that work with Android XML layouts Send accessibility events Be compatible with multiple Android platforms. The Android framework provides a set of base classes and XML tags to help you create a view that meets all of these requirements. This lesson discusses how to use the Android framework to create the core functionality of a view class.