public class

TabWidget

extends LinearLayout
implements View.OnFocusChangeListener
java.lang.Object
   ↳ android.view.View
     ↳ android.view.ViewGroup
       ↳ android.widget.LinearLayout
         ↳ android.widget.TabWidget

Class Overview

Displays a list of tab labels representing each page in the parent's tab collection. The container object for this widget is TabHost. When the user selects a tab, this object sends a message to the parent container, TabHost, to tell it to switch the displayed page. You typically won't use many methods directly on this object. The container TabHost is used to add labels, add the callback handler, and manage callbacks. You might call this object to iterate the list of tabs, or to tweak the layout of the tab list, but most methods should be called on the containing TabHost object.

Summary

XML Attributes
Attribute Name Related Method Description
android:divider Drawable used to draw the divider between tabs. 
android:tabStripEnabled Determines whether the strip under the tab indicators is drawn or not. 
android:tabStripLeft Drawable used to draw the left part of the strip underneath the tabs. 
android:tabStripRight Drawable used to draw the right part of the strip underneath the tabs. 
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Inherited XML Attributes
From class android.widget.LinearLayout
From class android.view.ViewGroup
From class android.view.View
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Inherited Constants
From class android.widget.LinearLayout
From class android.view.ViewGroup
From class android.view.View
Public Constructors
TabWidget(Context context)
TabWidget(Context context, AttributeSet attrs)
TabWidget(Context context, AttributeSet attrs, int defStyle)
Public Methods
void addView(View child)
Adds a child view.
void childDrawableStateChanged(View child)
If {link #addStatesFromChildren} is true, refreshes this group's drawable state (to include the states from its children).
void dispatchDraw(Canvas canvas)
Called by draw to draw the child views.
void focusCurrentTab(int index)
Sets the current tab and focuses the UI on it.
View getChildTabViewAt(int index)
Returns the tab indicator view at the given index.
int getTabCount()
Returns the number of tab indicator views.
boolean isStripEnabled()
Indicates whether the bottom strips on the tab indicators are drawn or not.
void onFocusChange(View v, boolean hasFocus)
Called when the focus state of a view has changed.
void setCurrentTab(int index)
Sets the current tab.
void setDividerDrawable(Drawable drawable)
Sets the drawable to use as a divider between the tab indicators.
void setDividerDrawable(int resId)
Sets the drawable to use as a divider between the tab indicators.
void setEnabled(boolean enabled)
Set the enabled state of this view.
void setLeftStripDrawable(int resId)
Sets the drawable to use as the left part of the strip below the tab indicators.
void setLeftStripDrawable(Drawable drawable)
Sets the drawable to use as the left part of the strip below the tab indicators.
void setRightStripDrawable(int resId)
Sets the drawable to use as the right part of the strip below the tab indicators.
void setRightStripDrawable(Drawable drawable)
Sets the drawable to use as the right part of the strip below the tab indicators.
void setStripEnabled(boolean stripEnabled)
Controls whether the bottom strips on the tab indicators are drawn or not.
Protected Methods
int getChildDrawingOrder(int childCount, int i)
Returns the index of the child to draw for this iteration.
void onSizeChanged(int w, int h, int oldw, int oldh)
This is called during layout when the size of this view has changed.
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Inherited Methods
From class android.widget.LinearLayout
From class android.view.ViewGroup
From class android.view.View
From class java.lang.Object
From interface android.graphics.drawable.Drawable.Callback
From interface android.view.KeyEvent.Callback
From interface android.view.View.OnFocusChangeListener
From interface android.view.ViewManager
From interface android.view.ViewParent
From interface android.view.accessibility.AccessibilityEventSource

XML Attributes

android:divider

Since: API Level

Drawable used to draw the divider between tabs.

May be a reference to another resource, in the form "@[+][package:]type:name" or to a theme attribute in the form "?[package:][type:]name".

May be a color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".

This corresponds to the global attribute resource symbol divider.

Related Methods

android:tabStripEnabled

Since: API Level

Determines whether the strip under the tab indicators is drawn or not.

Must be a boolean value, either "true" or "false".

This may also be a reference to a resource (in the form "@[package:]type:name") or theme attribute (in the form "?[package:][type:]name") containing a value of this type.

This corresponds to the global attribute resource symbol tabStripEnabled.

Related Methods

android:tabStripLeft

Since: API Level

Drawable used to draw the left part of the strip underneath the tabs.

Must be a reference to another resource, in the form "@[+][package:]type:name" or to a theme attribute in the form "?[package:][type:]name".

This corresponds to the global attribute resource symbol tabStripLeft.

Related Methods

android:tabStripRight

Since: API Level

Drawable used to draw the right part of the strip underneath the tabs.

Must be a reference to another resource, in the form "@[+][package:]type:name" or to a theme attribute in the form "?[package:][type:]name".

This corresponds to the global attribute resource symbol tabStripRight.

Related Methods

Public Constructors

public TabWidget (Context context)

Since: API Level 1

public TabWidget (Context context, AttributeSet attrs)

Since: API Level 1

public TabWidget (Context context, AttributeSet attrs, int defStyle)

Since: API Level 1

Public Methods

public void addView (View child)

Since: API Level 1

Adds a child view. If no layout parameters are already set on the child, the default parameters for this ViewGroup are set on the child.

Parameters
child the child view to add

public void childDrawableStateChanged (View child)

Since: API Level 1

If {link #addStatesFromChildren} is true, refreshes this group's drawable state (to include the states from its children).

Parameters
child The child whose drawable state has changed.

public void dispatchDraw (Canvas canvas)

Since: API Level 1

Called by draw to draw the child views. This may be overridden by derived classes to gain control just before its children are drawn (but after its own view has been drawn).

Parameters
canvas the canvas on which to draw the view

public void focusCurrentTab (int index)

Since: API Level 1

Sets the current tab and focuses the UI on it. This method makes sure that the focused tab matches the selected tab, normally at setCurrentTab(int). Normally this would not be an issue if we go through the UI, since the UI is responsible for calling TabWidget.onFocusChanged(), but in the case where we are selecting the tab programmatically, we'll need to make sure focus keeps up.

Parameters
index The tab that you want focused (highlighted in orange) and selected (tab brought to the front of the widget)

public View getChildTabViewAt (int index)

Since: API Level 4

Returns the tab indicator view at the given index.

Parameters
index the zero-based index of the tab indicator view to return
Returns
  • the tab indicator view at the given index

public int getTabCount ()

Since: API Level 4

Returns the number of tab indicator views.

Returns
  • the number of tab indicator views.

public boolean isStripEnabled ()

Since: API Level 8

Indicates whether the bottom strips on the tab indicators are drawn or not.

public void onFocusChange (View v, boolean hasFocus)

Since: API Level 1

Called when the focus state of a view has changed.

Parameters
v The view whose state has changed.
hasFocus The new focus state of v.

public void setCurrentTab (int index)

Since: API Level 1

Sets the current tab. This method is used to bring a tab to the front of the Widget, and is used to post to the rest of the UI that a different tab has been brought to the foreground. Note, this is separate from the traditional "focus" that is employed from the view logic. For instance, if we have a list in a tabbed view, a user may be navigating up and down the list, moving the UI focus (orange highlighting) through the list items. The cursor movement does not effect the "selected" tab though, because what is being scrolled through is all on the same tab. The selected tab only changes when we navigate between tabs (moving from the list view to the next tabbed view, in this example). To move both the focus AND the selected tab at once, please use setCurrentTab(int). Normally, the view logic takes care of adjusting the focus, so unless you're circumventing the UI, you'll probably just focus your interest here.

Parameters
index The tab that you want to indicate as the selected tab (tab brought to the front of the widget)

public void setDividerDrawable (Drawable drawable)

Since: API Level 4

Sets the drawable to use as a divider between the tab indicators.

Parameters
drawable the divider drawable

public void setDividerDrawable (int resId)

Since: API Level 4

Sets the drawable to use as a divider between the tab indicators.

Parameters
resId the resource identifier of the drawable to use as a divider.

public void setEnabled (boolean enabled)

Since: API Level 1

Set the enabled state of this view. The interpretation of the enabled state varies by subclass.

Parameters
enabled True if this view is enabled, false otherwise.

public void setLeftStripDrawable (int resId)

Since: API Level 8

Sets the drawable to use as the left part of the strip below the tab indicators.

Parameters
resId the resource identifier of the drawable to use as the left strip drawable

public void setLeftStripDrawable (Drawable drawable)

Since: API Level 8

Sets the drawable to use as the left part of the strip below the tab indicators.

Parameters
drawable the left strip drawable

public void setRightStripDrawable (int resId)

Since: API Level 8

Sets the drawable to use as the right part of the strip below the tab indicators.

Parameters
resId the resource identifier of the drawable to use as the right strip drawable

public void setRightStripDrawable (Drawable drawable)

Since: API Level 8

Sets the drawable to use as the right part of the strip below the tab indicators.

Parameters
drawable the right strip drawable

public void setStripEnabled (boolean stripEnabled)

Since: API Level 8

Controls whether the bottom strips on the tab indicators are drawn or not. The default is to draw them. If the user specifies a custom view for the tab indicators, then the TabHost class calls this method to disable drawing of the bottom strips.

Parameters
stripEnabled true if the bottom strips should be drawn.

Protected Methods

protected int getChildDrawingOrder (int childCount, int i)

Since: API Level 1

Returns the index of the child to draw for this iteration. Override this if you want to change the drawing order of children. By default, it returns i.

NOTE: In order for this method to be called, you must enable child ordering first by calling setChildrenDrawingOrderEnabled(boolean).

Parameters
i The current iteration.
Returns
  • The index of the child to draw this iteration.

protected void onSizeChanged (int w, int h, int oldw, int oldh)

Since: API Level 1

This is called during layout when the size of this view has changed. If you were just added to the view hierarchy, you're called with the old values of 0.

Parameters
w Current width of this view.
h Current height of this view.
oldw Old width of this view.
oldh Old height of this view.