Android View与ViewGroup 关系
View派生出的直接子类有:AnalogClock,ImageView,KeyboardView, ProgressBar,SurfaceView,TextView,ViewGroup,ViewStub
View派生出的间接子类有:AbsListView,AbsSeekBar, AbsSpinner, AbsoluteLayout, AdapterView<T extends Adapter>,AdapterViewAnimator, AdapterViewFlipper, AppWidgetHostView, AutoCompleteTextView,Button,CalendarView, CheckBox, CheckedTextView, Chronometer, CompoundButton,
ViewGroup派生出的直接子类有:AbsoluteLayout,AdapterView<T extends Adapter>,FragmentBreadCrumbs,FrameLayout,LinearLayout,RelativeLayout,SlidingDrawer
ViewGroup派生出的间接子类有:AbsListView,AbsSpinner, AdapterViewAnimator, AdapterViewFlipper, AppWidgetHostView, CalendarView, DatePicker, DialerFilter, ExpandableListView, Gallery, GestureOverlayView,GridView,HorizontalScrollView, ImageSwitcher,ListView,