LayoutInflater.Factory的妙用

自定义实现个Factory，可以用来解析自定义的属性。
public interface Factory {
        /**
         * Hook you can supply that is called when inflating from a LayoutInflater.
         * You can use this to customize the tag names available in your XML
         * layout files.
         * 
         * <p>
         * Note that it is good practice to prefix these custom names with your
         * package (i.e., com.coolcompany.apps) to avoid conflicts with system
         * names.
         * 
         * @param name Tag name to be inflated.
         * @param context The context the view is being created in.
         * @param attrs Inflation attributes as specified in XML file.
         * 
         * @return View Newly created view. Return null for the default
         *         behavior.如果返回一个view， 那么就会直接加入到原有View树中去。 如果返回null，则会走原来类似于onCreate的方法。
         */
        public View onCreateView(String name, Context context, AttributeSet attrs);
    }