List of indirect viewgroup subclasses of Android (for future reference)

Abslistview	Basic classes that can be used to implement the virtualization project list
Absspinner	Abstract base class for fine-tuned Widgets
Adapterviewanimator	It uses adapterview as the base class to implement animations during switching between views.
Adapterviewflipper	It is a simple implementation of view animation. You can execute an animation between views added to it.
Appwidgethostview	Provide a display space for the display appwidget window
Calendarview	This class is a calendar Control for displaying and selecting dates.
Datepicker	This class is a window control for date selection.
Dialerfilter
Expandablelistview	The view control of the project is displayed in the vertical scroll list.
Fragmenttabhost	Fragmenttabhost version that can be used with the platform's fragment API
Gallery	This class is discarded in API level 16. This widget is no longer supported. Other widgets that support horizontal scrolling in the Class Library include horzontalscrollview and viewpager.
Gestureoverlayview	A transparent overlayer for gesture input. It can be placed on other widgets or contain other widgets)
Gridview	Display the view control of a project in a two-dimensional rolling Grid
Horizontalscrollview	You can horizontally scroll the view structure to layout the container, allowing it to be larger than the physical display size.
Imageswitcher
Listview	Display the view control of the project in the vertical scroll list
Mediacontroller	View Control for mediaplayer Control
Numberpicker	Allows users to select visual controls for numbers from a predefined range
Pagertabstrip	This class is used to indicate the interaction between the current page, next page, and previous page of The viewpager control.
Radiogroup	This class is used to create a group of radio buttons
Scrollview	You can scroll the view structure to layout the container, allowing it to be larger than the physical display size.
Searchview	This visual control provides users with an interface for entering query characters and submits query requests to the search provider.
Spinner	The drop-down list control displays the project selected from the list each time.
Stackview
Tabhost	Container of the tab window
Tabwidget	Displays the option tag list. Each option tag represents a page in the parent option set.
Tablelayout	A Layout class for arranging container neutron views in the format of rows and columns
Tablerow	A Layout class for horizontal arrangement of container neutron View
Textswitcher	Viewswitcher is dedicated to view controls that contain textview types.
Timepicker	A View control used to select time, which can be 24 hours or am/PM mode.
Twolinelistitem	This class is deprecated in API Level 17. This class can be easily implemented for the relativelayout or linearlayout layout of the application.
Viewanimator	The base class used for framelayout containers. It performs an animation during view switching.
Viewflipper	A simple implementation of the viewanimator class, which performs an animation between views added to it.
Viewswitcher	A subclass of the viewanimator class that switches between two views, and a factory that creates these views.
Webview	Displays the view control of a webpage.
Zoomcontrols	The zomcontrols class displays a simple set of controls for scaling and provides callback for event registration.