Android - An Open Handset Alliance Project

android.widget
public class

android.widget.TabHost

java.lang.Object
	android.view.View				Drawable.Callback KeyEvent.Callback
		android.view.ViewGroup			ViewManager ViewParent
			android.widget.FrameLayout
				android.widget.TabHost

Container for a tabbed window view. This object holds two children: a set of tab labels that the user clicks to select a specific tab, and a FrameLayout object that displays the contents of that page. The individual elements are typically controlled using this container object, rather than setting values on the child elements themselves.

Also see ViewGroup.LayoutParams for layout attributes.

Nested Classes

TabHost.OnTabChangeListener	Interface definition for a callback to be invoked when tab changed
TabHost.TabContentFactory	Makes the content of a tab when it is selected.
TabHost.TabSpec	A tab has a tab indictor, content, and a tag that is used to keep track of it.

Summary

XML Attributes inherited from class android.widget.FrameLayout

Attribute name	Related methods
android:foreground	setForeground(Drawable)
android:measureAllChildren	setMeasureAllChildren(boolean)	Determines whether to measure all children or just those in the VISIBLE or INVISIBLE state when measuring.

XML Attributes inherited from class android.view.ViewGroup

android:clipChildren, android:clipToPadding

Attribute name	Related methods
android:clipChildren	setClipChildren(boolean)	Defines whether a child is limited to draw inside of its bounds or not.
android:clipToPadding	setClipToPadding(boolean)	Defines whether the ViewGroup will clip its drawing surface so as to exclude the padding area.

XML Attributes inherited from class android.view.View

Attribute name	Related methods
android:background	setBackground(int)	A drawable to use as the background.
android:clickable	setClickable(boolean)	Defines whether this view reacts to click events.
android:drawingCacheQuality	setDrawingCacheQuality(int)	Defines the quality of translucent drawing caches.
android:fadingEdge	setVerticalFadingEdgeEnabled(boolean)	Defines which edges should be fadeded on scrolling.
android:fadingEdgeLength	getVerticalFadingEdgeLength()	Defines the length of the fading edges.
android:fitStatusBar		Boolean internal attribute to adjust view layout based on the status bar location.
android:focusType	setFocusType(int)	Sets the circumstances under which this view will take focus.
android:focusable	setFocusable(boolean)	Boolean that controls whether a view can take focus.
android:focusableInTouchMode	setFocusableInTouchMode(boolean)	Boolean that controls whether a view can take focus while in touch mode.
android:freezeDisabled	setFreezeDisabled(boolean)	If set, no icicle will be saved for this view when it is being frozen.
android:id	setId(int)	Supply an identifier name for this view, to later retrieve it with View.findViewById() or Activity.findViewById().
android:nextFocusDown		Defines the next view to give focus to when the next focus is FOCUS_DOWN If the reference refers to a view that does not exist or is part of a hierarchy that is invisible, a RuntimeException will result when the reference is accessed.
android:nextFocusLeft		Defines the next view to give focus to when the next focus is FOCUS_LEFT.
android:nextFocusRight		Defines the next view to give focus to when the next focus is FOCUS_RIGHT If the reference refers to a view that does not exist or is part of a hierarchy that is invisible, a RuntimeException will result when the reference is accessed.
android:nextFocusUp		Defines the next view to give focus to when the next focus is FOCUS_UP If the reference refers to a view that does not exist or is part of a hierarchy that is invisible, a RuntimeException will result when the reference is accessed.
android:padding	setPadding(int,int,int,int)	Sets the padding, in pixels, of all four edges.
android:paddingBottom	setPadding(int,int,int,int)	Sets the padding, in pixels, of the bottom edge; see padding.
android:paddingLeft	setPadding(int,int,int,int)	Sets the padding, in pixels, of the left edge; see padding.
android:paddingRight	setPadding(int,int,int,int)	Sets the padding, in pixels, of the right edge; see padding.
android:paddingTop	setPadding(int,int,int,int)	Sets the padding, in pixels, of the top edge; see padding.
android:scrollX		The initial horizontal scroll offset, in pixels.
android:scrollY		The initial vertical scroll offset, in pixels.
android:scrollbarDefaultDelayBeforeFade		Delay in milliseconds before the scrollbars disappear.
android:scrollbarFadeDuration		Duration in milliseconds of the fade when the scrollbars disappear.
android:scrollbarSize		Sets the width of vertical scrollbars and height of horizontal scrollbars.
android:scrollbarThumbHorizontal		Drawable for horizontal scrollbars' thumb.
android:scrollbarThumbVertical		Drawable for vertical scrollbars' thumb.
android:scrollbarTrackHorizontal		Drawable for horizontal scrollbars' track.
android:scrollbarTrackVertical		Drawable for vertical scrollbars' track.
android:scrollbars		Defines which scrollbars should be displayed on scrolling or not.
android:visibility	setVisibility(int)	Controls the initial visibility of the view.

Constants inherited from class android.view.ViewGroup

FLAG_SUPPORT_STATIC_TRANSFORMATIONS, PERSISTENT_ALL_CACHES, PERSISTENT_ANIMATION_CACHE, PERSISTENT_NO_CACHE, PERSISTENT_SCROLLING_CACHE

			Value
int	FLAG_SUPPORT_STATIC_TRANSFORMATIONS	When set, this ViewGroup supports static transformations on children; this causes getChildStaticTransformation(View, android.view.animation.Transformation) to be invoked when a child is drawn.	2048	0x00000800
int	PERSISTENT_ALL_CACHES	Used to indicate that all drawing caches should be kept in memory.	3	0x00000003
int	PERSISTENT_ANIMATION_CACHE	Used to indicate that the animation drawing cache should be kept in memory.	1	0x00000001
int	PERSISTENT_NO_CACHE	Used to indicate that no drawing cache should be kept in memory.	0	0x00000000
int	PERSISTENT_SCROLLING_CACHE	Used to indicate that the scrolling drawing cache should be kept in memory.	2	0x00000002

Constants inherited from class android.view.View

DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_HIGH, DRAWING_CACHE_QUALITY_LOW, FOCUS_BACKWARD, FOCUS_DOWN, FOCUS_FORWARD, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_UP, GONE, INVISIBLE, NORMAL_FOCUS, NO_ID, VIEW_LOG_TAG, VISIBLE, WEAK_FOCUS

			Value
int	DRAWING_CACHE_QUALITY_AUTO	Enables automatic quality mode for the drawing cache.	0	0x00000000
int	DRAWING_CACHE_QUALITY_HIGH	Enables high quality mode for the drawing cache.	1048576	0x00100000
int	DRAWING_CACHE_QUALITY_LOW	Enables low quality mode for the drawing cache.	524288	0x00080000
int	FOCUS_BACKWARD	Use with focusSearch(int).	1	0x00000001
int	FOCUS_DOWN	Use with focusSearch(int).	130	0x00000082
int	FOCUS_FORWARD	Use with focusSearch(int).	2	0x00000002
int	FOCUS_LEFT	Use with focusSearch(int).	17	0x00000011
int	FOCUS_RIGHT	Use with focusSearch(int).	66	0x00000042
int	FOCUS_UP	Use with focusSearch(int).	33	0x00000021
int	GONE	This view is invisible, and it doesn't take any space for layout purposes.	8	0x00000008
int	INVISIBLE	This view is invisible, but it still takes up space for layout purposes.	4	0x00000004
int	NORMAL_FOCUS	This view wants keystrokes.	0	0x00000000
int	NO_ID	Used to mark a View that has no ID.	-1	0xffffffff
String	VIEW_LOG_TAG	The logging tag used by this class with android.util.Log.	"View"
int	VISIBLE	This view is visible.	0	0x00000000
int	WEAK_FOCUS	This view wants keystrokes, but only if none of its children has focus.	2	0x00000002

Fields

protected			int	mCurrentTab
protected			LocalActivityManager	mLocalActivityManager

Fields inherited from class android.widget.FrameLayout

Fields inherited from class android.view.ViewGroup

mDisappearingChildren, mGroupFlags, mOnHierarchyChangeListener, mPersistentDrawingCache

Fields inherited from class android.view.View

mBottom, mContext, mLayoutParams, mLeft, mLocation, mOnClickListener, mOnFocusChangeListener, mOnLongClickListener, mOnPopulateContextMenuListener, mPaddingBottom, mPaddingLeft, mPaddingRight, mPaddingTop, mParent, mRight, mScrollX, mScrollY, mTag, mTop

protected		int	mBottom	The distance in pixels from the top edge of this view's parent to the bottom edge of this view.
protected		Context	mContext	The application environment this view lives in.
protected		LayoutParams	mLayoutParams	The layout parameters associated with this view and used by the parent ViewGroup to determine how this view should be laid out.
protected		int	mLeft	The distance in pixels from the left edge of this view's parent to the left edge of this view.
protected	final	int[]	mLocation	Used to store a pair of coordinates, for instance returned values returned by getLocationInWindow(int[]).
protected		OnClickListener	mOnClickListener	Listener used to dispatch click events.
protected		OnFocusChangeListener	mOnFocusChangeListener	Listener used to dispatch focus change events.
protected		OnLongClickListener	mOnLongClickListener	Listener used to dispatch long click events.
protected		OnPopulateContextMenuListener	mOnPopulateContextMenuListener	Listener used to build the context menu.
protected		int	mPaddingBottom	The bottom padding in pixels, that is the distance in pixels between the bottom edge of this view and the bottom edge of its content.
protected		int	mPaddingLeft	The left padding in pixels, that is the distance in pixels between the left edge of this view and the left edge of its content.
protected		int	mPaddingRight	The right padding in pixels, that is the distance in pixels between the right edge of this view and the right edge of its content.
protected		int	mPaddingTop	The top padding in pixels, that is the distance in pixels between the top edge of this view and the top edge of its content.
protected		ViewParent	mParent	The parent this view is attached to.
protected		int	mRight	The distance in pixels from the left edge of this view's parent to the right edge of this view.
protected		int	mScrollX	The offset, in pixels, by which the content of this view is scrolled horizontally.
protected		int	mScrollY	The offset, in pixels, by which the content of this view is scrolled vertically.
protected		Object	mTag	The view's tag.
protected		int	mTop	The distance in pixels from the top edge of this view's parent to the top edge of this view.

Public Constructors

					TabHost(Context context)
					TabHost(Context context, AttributeSet attrs, Map inflateParams)

Public Methods

				void	addTab(TabSpec tabSpec)
				void	clearAllTabs(boolean clearContent)
					Removes all tabs from the tab widget associated with this tab host.
				boolean	dispatchUnhandledMove(View focused, int direction)
					This method is the last chance for the focused view and its ancestors to respond to an arrow key.
				int	getCurrentTab()
				String	getCurrentTabTag()
				View	getCurrentTabView()
				View	getCurrentView()
				FrameLayout	getTabContentView()
					Get the FrameLayout which holds tab content
				TabWidget	getTabWidget()
				TabSpec	newTabSpec(String tag)
					Get a new TabHost.TabSpec associated with this tab host.
				void	setCurrentTab(int index)
				void	setCurrentTabByTag(String tag)
				void	setOnTabChangedListener(OnTabChangeListener l)
					Register a callback to be invoked when the selected state of any of the items in this list changes
				void	setup()
					Call setup() before adding tabs if loading TabHost using findViewById().
				void	setup(LocalActivityManager activityGroup)

Methods inherited from class android.widget.FrameLayout

				void	draw(Canvas canvas)
					Manually render this view (and all of its children) to the given Canvas.
				void	drawableStateChanged()
					This function is called whenever the state of the view changes in such a way that it impacts the state of drawables being shown.
				boolean	gatherTransparentRegion(Region region)
					This is used by the RootView to perform an optimization when the view hierarchy contains one or several SurfaceView.
				boolean	getConsiderGoneChildrenWhenMeasuring()
					Determines whether to measure all children or just those in the VISIBLE or INVISIBLE state when measuring.
				Drawable	getForeground()
				void	onLayout(boolean changed, int l, int t, int r, int b)
					Called from layout when this view should assign a size and position to each of its children.
				void	onMeasure(int widthMeasureSpec, int heightMeasureSpec)
					Measure the view and its content to determine the measured width and the measured height.
				void	onSizeChanged(int w, int h, int oldw, int oldh)
					This is called during layout when the size of this view has changed.
				void	setForeground(Drawable drawable)
					Supply a Drawable that is to be rendered on top of all of the child views in the frame layout.
				void	setMeasureAllChildren(boolean measureAll)
					Determines whether to measure all children or just those in the VISIBLE or INVISIBLE state when measuring.
				boolean	verifyDrawable(Drawable who)
					If your view subclass is displaying its own Drawable objects, it should override this function and return true for any Drawable it is displaying.

Methods inherited from class android.view.ViewGroup

addView, addView, addView, addView, addViewInLayout, addViewInLayout, addsStatesFromChildren, attachLayoutAnimationParameters, attachViewToParent, bringChildToFront, canAnimate, checkLayoutParams, childDrawableStateChanged, cleanupLayoutState, clearChildFocus, clearDisappearingChildren, clearFocus, debug, detachAllViewsFromParent, detachViewFromParent, detachViewFromParent, dispatchDraw, dispatchFreeze, dispatchFreezeSelfOnly, dispatchKeyEvent, dispatchThaw, dispatchThawSelfOnly, dispatchTouchEvent, dispatchTrackballEvent, dispatchUnhandledMove, dispatchWindowFocusChanged, dispatchWindowVisibilityChanged, findFocus, focusSearch, focusableViewAvailable, gatherTransparentRegion, generateLayoutParams, getChildAt, getChildCount, getChildMeasureSpec, getChildStaticTransformation, getChildVisibleRect, getFocusedChild, getLayoutAnimation, getLayoutAnimationListener, getPeristentDrawingCache, hasFocus, indexOfChild, invalidateChild, invalidateChildInParent, isAlwaysDrawnWithCacheEnabled, isAnimationCacheEnabled, isChildrenDrawnWithCacheEnabled, isKeepAnimations, measureChild, measureChildWithMargins, measureChildren, offsetDescendantRectToMyCoords, offsetRectIntoDescendantCoords, onCreateDrawableState, onInterceptTouchEvent, onLayout, removeAllViews, removeAllViewsInLayout, removeDetachedView, removeView, removeViewAt, removeViewInLayout, requestChildFocus, requestChildRectangleOnScreen, requestFocus, requestTransparentRegion, scheduleLayoutAnimation, setAddsStatesFromChildren, setAlwaysDrawnWithCacheEnabled, setAnimationCacheEnabled, setChildrenDrawingCacheEnabled, setChildrenDrawnWithCacheEnabled, setClipChildren, setClipToPadding, setKeepAnimations, setLayoutAnimation, setLayoutAnimationListener, setOnHierarchyChangeListener, setPadding, setPersistentDrawingCache, setSelected, showContextMenuForChild, startLayoutAnimation, updateViewLayout

		void	addView(View child, int index)
			Adds a child view that already has layout parameters set on it.
		void	addView(View child, int index, LayoutParams params)
			Adds a child view with the specified layout parameters.
		void	addView(View child, LayoutParams params)
			Adds a child view with the specified layout parameters.
		void	addView(View child)
			Adds a child view that already has layout parameters set on it.
		boolean	addViewInLayout(View child, int index, LayoutParams params)
			Adds a view during layout.
		boolean	addViewInLayout(View child, int index, LayoutParams params, boolean preventRequestLayout)
			Adds a view during layout.
		boolean	addsStatesFromChildren()
			Returns whether this ViewGroup's drawable states also include its children's drawable states.
		void	attachLayoutAnimationParameters(View child, LayoutParams params, int index, int count)
			Subclasses should override this method to set layout animation parameters on the supplied child.
		void	attachViewToParent(View child, int index, LayoutParams params)
			Attaches a view to this view group.
		void	bringChildToFront(View child)
			Change the z order of the child so it's on top of all other children
		boolean	canAnimate()
			Indicates whether the view group has the ability to animate its children after the first layout.
		boolean	checkLayoutParams(LayoutParams p)

		void	childDrawableStateChanged(View child)
			If {link #addsStatesFromChildren} is true, refreshes this group's drawable state (to include the states from its children).
		void	cleanupLayoutState(View child)
			Prevents the specified child to be laid out during the next layout pass.
		void	clearChildFocus(View child)
			Called when a child of this parent is giving up focus
		void	clearDisappearingChildren()
			Removes any pending animations for views that have been removed.
		void	clearFocus()
			Called when this view wants to give up focus.
		void	debug(int depth)
			Prints information about this view in the log output, with the tag VIEW_LOG_TAG.
		void	detachAllViewsFromParent()
			Detaches all views from theparent.
		void	detachViewFromParent(View child)
			Detaches a view from its parent.
		void	detachViewFromParent(int index)
			Detaches a view from its parent.
		void	dispatchDraw(Canvas canvas)
			Called by draw to draw the child views.
		void	dispatchFreeze(SparseArray container)
			Called by freeze(SparseArray) to store the icicles for this view and its children.
		void	dispatchFreezeSelfOnly(SparseArray container)
			Perform dispatching of a freeze() to only this view, not to its children.
		boolean	dispatchKeyEvent(KeyEvent event)
			Dispatch a key event to the next view on the focus path.
		void	dispatchThaw(SparseArray container)
			Called by thaw(SparseArray) to retrieve the icicles for this view and its children.
		void	dispatchThawSelfOnly(SparseArray container)
			Perform dispatching of a thaw() to only this view, not to its children.
		boolean	dispatchTouchEvent(MotionEvent ev)
			Pass the touch screen motion event down to the target view, or this view if it is the target.
		boolean	dispatchTrackballEvent(MotionEvent event)
			Pass a trackball motion event down to the focused view.
		boolean	dispatchUnhandledMove(View focused, int direction)
			This method is the last chance for the focused view and its ancestors to respond to an arrow key.
		void	dispatchWindowFocusChanged(boolean hasFocus)
			Called when the window containing this view gains or loses window focus.
		void	dispatchWindowVisibilityChanged(int visibility)
			Dispatch a window visibility change down the view hierarchy.
		View	findFocus()
			Find the view in the hierarchy rooted at this view that currently has focus.
		View	focusSearch(View v, int direction)
			Find the nearest view in the specified direction that wants to take focus.
		void	focusableViewAvailable(View v)
			Tells the parent that a new focusable view has become available.
		boolean	gatherTransparentRegion(Region region)
			This is used by the RootView to perform an optimization when the view hierarchy contains one or several SurfaceView.
		LayoutParams	generateLayoutParams(AttributeSet attrs)

		View	getChildAt(int index)
			Returns the view at the specified position in the group.
		int	getChildCount()
			Returns the number of children in the group.
	static	int	getChildMeasureSpec(int spec, int padding, int childDimension)
			Does the hard part of measureChildren: figuring out the MeasureSpec to pass to a particular child.
		boolean	getChildStaticTransformation(View child, Transformation t)

		boolean	getChildVisibleRect(View child, Rect r, Point offset)

		View	getFocusedChild()
			Returns the focused child of this view, if any.
		LayoutAnimationController	getLayoutAnimation()
			Returns the layout animation controller used to animate the group's children.
		AnimationListener	getLayoutAnimationListener()
			Returns the animation listener to which layout animation events are sent.
		int	getPeristentDrawingCache()
			Returns an integer indicating what types of drawing caches are kept in memory.
		boolean	hasFocus()
			Returns true if this view has or contains focus
		int	indexOfChild(View child)
			Returns the position in the group of the specified child view.
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