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ListView

public class ListView
extends AbsListView

java.lang.Object
   ↳ android.view.View
     ↳ android.view.ViewGroup
       ↳ android.widget.AdapterView<android.widget.ListAdapter>
         ↳ android.widget.AbsListView
           ↳ android.widget.ListView
Known Direct Subclasses


A view that shows items in a vertically scrolling list. The items come from the ListAdapter associated with this view.

See the List View guide.

Summary

Nested classes

class ListView.FixedViewInfo

A class that represents a fixed view in a list, for example a header at the top or a footer at the bottom. 

XML attributes

android:divider Drawable or color to draw between list items. 
android:divider Drawable or color to draw between list items. 
android:dividerHeight Height of the divider. 
android:entries Reference to an array resource that will populate the ListView. 
android:footerDividersEnabled When set to false, the ListView will not draw the divider before each footer view. 
android:headerDividersEnabled When set to false, the ListView will not draw the divider after each header view. 

Inherited XML attributes

From class android.widget.AbsListView
From class android.view.ViewGroup
From class android.view.View

Inherited constants

From class android.widget.AbsListView
From class android.widget.AdapterView
From class android.view.ViewGroup
From class android.view.View

Inherited fields

From class android.view.View

Public constructors

ListView(Context context)
ListView(Context context, AttributeSet attrs)
ListView(Context context, AttributeSet attrs, int defStyleAttr)
ListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)

Public methods

void addFooterView(View v, Object data, boolean isSelectable)

Add a fixed view to appear at the bottom of the list.

void addFooterView(View v)

Add a fixed view to appear at the bottom of the list.

void addHeaderView(View v, Object data, boolean isSelectable)

Add a fixed view to appear at the top of the list.

void addHeaderView(View v)

Add a fixed view to appear at the top of the list.

boolean areFooterDividersEnabled()
boolean areHeaderDividersEnabled()
boolean dispatchKeyEvent(KeyEvent event)

Dispatch a key event to the next view on the focus path.

CharSequence getAccessibilityClassName()

Return the class name of this object to be used for accessibility purposes.

ListAdapter getAdapter()

Returns the adapter currently in use in this ListView.

long[] getCheckItemIds()

This method was deprecated in API level 8. Use getCheckedItemIds() instead.

Drawable getDivider()

Returns the drawable that will be drawn between each item in the list.

int getDividerHeight()
int getFooterViewsCount()

Returns the number of footer views in the list.

int getHeaderViewsCount()

Returns the number of header views in the list.

boolean getItemsCanFocus()
int getMaxScrollAmount()
Drawable getOverscrollFooter()
Drawable getOverscrollHeader()
boolean isOpaque()

Indicates whether this View is opaque.

void onInitializeAccessibilityNodeInfoForItem(View view, int position, AccessibilityNodeInfo info)

Initializes an AccessibilityNodeInfo with information about a particular item in the list.

boolean onKeyDown(int keyCode, KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyDown(): perform press of the view when KEYCODE_DPAD_CENTER or KEYCODE_ENTER is released, if the view is enabled and clickable.

boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyMultiple(): always returns false (doesn't handle the event).

boolean onKeyUp(int keyCode, KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyUp(): perform clicking of the view when KEYCODE_DPAD_CENTER, KEYCODE_ENTER or KEYCODE_SPACE is released.

boolean removeFooterView(View v)

Removes a previously-added footer view.

boolean removeHeaderView(View v)

Removes a previously-added header view.

boolean requestChildRectangleOnScreen(View child, Rect rect, boolean immediate)

Called when a child of this group wants a particular rectangle to be positioned onto the screen.

void setAdapter(ListAdapter adapter)

Sets the data behind this ListView.

void setCacheColorHint(int color)

When set to a non-zero value, the cache color hint indicates that this list is always drawn on top of a solid, single-color, opaque background.

void setDivider(Drawable divider)

Sets the drawable that will be drawn between each item in the list.

void setDividerHeight(int height)

Sets the height of the divider that will be drawn between each item in the list.

void setFooterDividersEnabled(boolean footerDividersEnabled)

Enables or disables the drawing of the divider for footer views.

void setHeaderDividersEnabled(boolean headerDividersEnabled)

Enables or disables the drawing of the divider for header views.

void setItemsCanFocus(boolean itemsCanFocus)

Indicates that the views created by the ListAdapter can contain focusable items.

void setOverscrollFooter(Drawable footer)

Sets the drawable that will be drawn below all other list content.

void setOverscrollHeader(Drawable header)

Sets the drawable that will be drawn above all other list content.

void setRemoteViewsAdapter(Intent intent)

Sets up this AbsListView to use a remote views adapter which connects to a RemoteViewsService through the specified intent.

void setSelection(int position)

Sets the currently selected item.

void setSelectionAfterHeaderView()

setSelectionAfterHeaderView set the selection to be the first list item after the header views.

void smoothScrollByOffset(int offset)

Smoothly scroll to the specified adapter position offset.

void smoothScrollToPosition(int position)

Smoothly scroll to the specified adapter position.

Protected methods

boolean canAnimate()

Indicates whether the view group has the ability to animate its children after the first layout.

void dispatchDraw(Canvas canvas)

Called by draw to draw the child views.

boolean drawChild(Canvas canvas, View child, long drawingTime)

Draw one child of this View Group.

View findViewTraversal(int id)

View findViewWithTagTraversal(Object tag)

void layoutChildren()

Subclasses must override this method to layout their children.

void onDetachedFromWindow()

This is called when the view is detached from a window.

void onFinishInflate()

Finalize inflating a view from XML.

void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect)

Called by the view system when the focus state of this view changes.

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.

Inherited methods

From class android.widget.AbsListView
From class android.widget.AdapterView
From class android.view.ViewGroup
From class android.view.View
From class java.lang.Object
From interface android.text.TextWatcher
From interface android.view.ViewTreeObserver.OnGlobalLayoutListener
From interface android.widget.Filter.FilterListener
From interface android.view.ViewTreeObserver.OnTouchModeChangeListener
From interface android.view.ViewParent
From interface android.view.ViewManager
From interface android.graphics.drawable.Drawable.Callback
From interface android.view.KeyEvent.Callback
From interface android.view.accessibility.AccessibilityEventSource

XML attributes

android:divider

Drawable or color to draw between list items.

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.

android:divider

Drawable or color to draw between list items.

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:dividerHeight

Height of the divider. Will use the intrinsic height of the divider if this is not specified.

Must be a dimension value, which is a floating point number appended with a unit such as "14.5sp". Available units are: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).

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 dividerHeight.

android:entries

Reference to an array resource that will populate the ListView. For static content, this is simpler than populating the ListView programmatically.

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 entries.

android:footerDividersEnabled

When set to false, the ListView will not draw the divider before each footer view. The default value is true.

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 footerDividersEnabled.

android:headerDividersEnabled

When set to false, the ListView will not draw the divider after each header view. The default value is true.

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 headerDividersEnabled.

Public constructors

ListView

Added in API level 1
ListView (Context context)

Parameters
context Context

ListView

Added in API level 1
ListView (Context context, 
                AttributeSet attrs)

Parameters
context Context
attrs AttributeSet

ListView

Added in API level 1
ListView (Context context, 
                AttributeSet attrs, 
                int defStyleAttr)

Parameters
context Context
attrs AttributeSet
defStyleAttr int

ListView

Added in API level 21
ListView (Context context, 
                AttributeSet attrs, 
                int defStyleAttr, 
                int defStyleRes)

Parameters
context Context
attrs AttributeSet
defStyleAttr int
defStyleRes int

Public methods

addFooterView

Added in API level 1
void addFooterView (View v, 
                Object data, 
                boolean isSelectable)

Add a fixed view to appear at the bottom of the list. If addFooterView is called more than once, the views will appear in the order they were added. Views added using this call can take focus if they want.

Note: When first introduced, this method could only be called before setting the adapter with setAdapter(ListAdapter). Starting with KITKAT, this method may be called at any time. If the ListView's adapter does not extend HeaderViewListAdapter, it will be wrapped with a supporting instance of WrapperListAdapter.

Parameters
v View: The view to add.
data Object: Data to associate with this view
isSelectable boolean: true if the footer view can be selected

addFooterView

Added in API level 1
void addFooterView (View v)

Add a fixed view to appear at the bottom of the list. If addFooterView is called more than once, the views will appear in the order they were added. Views added using this call can take focus if they want.

Note: When first introduced, this method could only be called before setting the adapter with setAdapter(ListAdapter). Starting with KITKAT, this method may be called at any time. If the ListView's adapter does not extend HeaderViewListAdapter, it will be wrapped with a supporting instance of WrapperListAdapter.

Parameters
v View: The view to add.

addHeaderView

Added in API level 1
void addHeaderView (View v, 
                Object data, 
                boolean isSelectable)

Add a fixed view to appear at the top of the list. If this method is called more than once, the views will appear in the order they were added. Views added using this call can take focus if they want.

Note: When first introduced, this method could only be called before setting the adapter with setAdapter(ListAdapter). Starting with KITKAT, this method may be called at any time. If the ListView's adapter does not extend HeaderViewListAdapter, it will be wrapped with a supporting instance of WrapperListAdapter.

Parameters
v View: The view to add.
data Object: Data to associate with this view
isSelectable boolean: whether the item is selectable

addHeaderView

Added in API level 1
void addHeaderView (View v)

Add a fixed view to appear at the top of the list. If addHeaderView is called more than once, the views will appear in the order they were added. Views added using this call can take focus if they want.

Note: When first introduced, this method could only be called before setting the adapter with setAdapter(ListAdapter). Starting with KITKAT, this method may be called at any time. If the ListView's adapter does not extend HeaderViewListAdapter, it will be wrapped with a supporting instance of WrapperListAdapter.

Parameters
v View: The view to add.

areFooterDividersEnabled

Added in API level 19
boolean areFooterDividersEnabled ()

Returns
boolean Whether the drawing of the divider for footer views is enabled

See also:

areHeaderDividersEnabled

Added in API level 19
boolean areHeaderDividersEnabled ()

Returns
boolean Whether the drawing of the divider for header views is enabled

See also:

dispatchKeyEvent

Added in API level 1
boolean dispatchKeyEvent (KeyEvent event)

Dispatch a key event to the next view on the focus path. This path runs from the top of the view tree down to the currently focused view. If this view has focus, it will dispatch to itself. Otherwise it will dispatch the next node down the focus path. This method also fires any key listeners.

Parameters
event KeyEvent: The key event to be dispatched.
Returns
boolean True if the event was handled, false otherwise.

getAccessibilityClassName

Added in API level 23
CharSequence getAccessibilityClassName ()

Return the class name of this object to be used for accessibility purposes. Subclasses should only override this if they are implementing something that should be seen as a completely new class of view when used by accessibility, unrelated to the class it is deriving from. This is used to fill in AccessibilityNodeInfo.setClassName.

Returns
CharSequence

getAdapter

Added in API level 1
ListAdapter getAdapter ()

Returns the adapter currently in use in this ListView. The returned adapter might not be the same adapter passed to setAdapter(ListAdapter) but might be a WrapperListAdapter.

Returns
ListAdapter The adapter currently used to display data in this ListView.

See also:

getCheckItemIds

Added in API level 4
long[] getCheckItemIds ()

This method was deprecated in API level 8.
Use getCheckedItemIds() instead.

Returns the set of checked items ids. The result is only valid if the choice mode has not been set to CHOICE_MODE_NONE.

Returns
long[] A new array which contains the id of each checked item in the list.

getDivider

Added in API level 1
Drawable getDivider ()

Returns the drawable that will be drawn between each item in the list.

Related XML Attributes:

Returns
Drawable the current drawable drawn between list elements

getDividerHeight

Added in API level 1
int getDividerHeight ()

Returns
int Returns the height of the divider that will be drawn between each item in the list.

getFooterViewsCount

Added in API level 1
int getFooterViewsCount ()

Returns the number of footer views in the list. Footer views are special views at the bottom of the list that should not be recycled during a layout.

Returns
int The number of footer views, 0 in the default implementation.

getHeaderViewsCount

Added in API level 1
int getHeaderViewsCount ()

Returns the number of header views in the list. Header views are special views at the top of the list that should not be recycled during a layout.

Returns
int The number of header views, 0 in the default implementation.

getItemsCanFocus

Added in API level 1
boolean getItemsCanFocus ()

Returns
boolean Whether the views created by the ListAdapter can contain focusable items.

getMaxScrollAmount

Added in API level 1
int getMaxScrollAmount ()

Returns
int The maximum amount a list view will scroll in response to an arrow event.

getOverscrollFooter

Added in API level 9
Drawable getOverscrollFooter ()

Returns
Drawable The drawable that will be drawn below all other list content

getOverscrollHeader

Added in API level 9
Drawable getOverscrollHeader ()

Returns
Drawable The drawable that will be drawn above all other list content

isOpaque

Added in API level 7
boolean isOpaque ()

Indicates whether this View is opaque. An opaque View guarantees that it will draw all the pixels overlapping its bounds using a fully opaque color. Subclasses of View should override this method whenever possible to indicate whether an instance is opaque. Opaque Views are treated in a special way by the View hierarchy, possibly allowing it to perform optimizations during invalidate/draw passes.

Returns
boolean True if this View is guaranteed to be fully opaque, false otherwise.

onInitializeAccessibilityNodeInfoForItem

Added in API level 19
void onInitializeAccessibilityNodeInfoForItem (View view, 
                int position, 
                AccessibilityNodeInfo info)

Initializes an AccessibilityNodeInfo with information about a particular item in the list.

Parameters
view View: View representing the list item.
position int: Position of the list item within the adapter.
info AccessibilityNodeInfo: Node info to populate.

onKeyDown

Added in API level 1
boolean onKeyDown (int keyCode, 
                KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyDown(): perform press of the view when KEYCODE_DPAD_CENTER or KEYCODE_ENTER is released, if the view is enabled and clickable.

Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.

Parameters
keyCode int: a key code that represents the button pressed, from KeyEvent
event KeyEvent: the KeyEvent object that defines the button action
Returns
boolean If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

onKeyMultiple

Added in API level 1
boolean onKeyMultiple (int keyCode, 
                int repeatCount, 
                KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyMultiple(): always returns false (doesn't handle the event).

Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.

Parameters
keyCode int: A key code that represents the button pressed, from KeyEvent.
repeatCount int: The number of times the action was made.
event KeyEvent: The KeyEvent object that defines the button action.
Returns
boolean If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

onKeyUp

Added in API level 1
boolean onKeyUp (int keyCode, 
                KeyEvent event)

Default implementation of KeyEvent.Callback.onKeyUp(): perform clicking of the view when KEYCODE_DPAD_CENTER, KEYCODE_ENTER or KEYCODE_SPACE is released.

Key presses in software keyboards will generally NOT trigger this listener, although some may elect to do so in some situations. Do not rely on this to catch software key presses.

Parameters
keyCode int: A key code that represents the button pressed, from KeyEvent.
event KeyEvent: The KeyEvent object that defines the button action.
Returns
boolean If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

removeFooterView

Added in API level 1
boolean removeFooterView (View v)

Removes a previously-added footer view.

Parameters
v View: The view to remove
Returns
boolean true if the view was removed, false if the view was not a footer view

removeHeaderView

Added in API level 1
boolean removeHeaderView (View v)

Removes a previously-added header view.

Parameters
v View: The view to remove
Returns
boolean true if the view was removed, false if the view was not a header view

requestChildRectangleOnScreen

Added in API level 1
boolean requestChildRectangleOnScreen (View child, 
                Rect rect, 
                boolean immediate)

Called when a child of this group wants a particular rectangle to be positioned onto the screen. ViewGroups overriding this can trust that:

  • child will be a direct child of this group
  • rectangle will be in the child's content coordinates

ViewGroups overriding this should uphold the contract:

  • nothing will change if the rectangle is already visible
  • the view port will be scrolled only just enough to make the rectangle visible
    • Parameters
      child View: The direct child making the request.
      rect Rect: The rectangle in the child's coordinates the child wishes to be on the screen.
      immediate boolean: True to forbid animated or delayed scrolling, false otherwise
      Returns
      boolean Whether the group scrolled to handle the operation

setAdapter

Added in API level 1
void setAdapter (ListAdapter adapter)

Sets the data behind this ListView. The adapter passed to this method may be wrapped by a WrapperListAdapter, depending on the ListView features currently in use. For instance, adding headers and/or footers will cause the adapter to be wrapped.

Parameters
adapter ListAdapter: The ListAdapter which is responsible for maintaining the data backing this list and for producing a view to represent an item in that data set.

See also:

setCacheColorHint

Added in API level 1
void setCacheColorHint (int color)

When set to a non-zero value, the cache color hint indicates that this list is always drawn on top of a solid, single-color, opaque background. Zero means that what's behind this object is translucent (non solid) or is not made of a single color. This hint will not affect any existing background drawable set on this view ( typically set via setBackgroundDrawable(Drawable)).

Parameters
color int: The background color

setDivider

Added in API level 1
void setDivider (Drawable divider)

Sets the drawable that will be drawn between each item in the list.

Note: If the drawable does not have an intrinsic height, you should also call setDividerHeight(int).

Related XML Attributes:

Parameters
divider Drawable: the drawable to use

setDividerHeight

Added in API level 1
void setDividerHeight (int height)

Sets the height of the divider that will be drawn between each item in the list. Calling this will override the intrinsic height as set by setDivider(Drawable)

Parameters
height int: The new height of the divider in pixels.

setFooterDividersEnabled

Added in API level 3
void setFooterDividersEnabled (boolean footerDividersEnabled)

Enables or disables the drawing of the divider for footer views.

Parameters
footerDividersEnabled boolean: True to draw the footers, false otherwise.

See also:

setHeaderDividersEnabled

Added in API level 3
void setHeaderDividersEnabled (boolean headerDividersEnabled)

Enables or disables the drawing of the divider for header views.

Parameters
headerDividersEnabled boolean: True to draw the headers, false otherwise.

See also:

setItemsCanFocus

Added in API level 1
void setItemsCanFocus (boolean itemsCanFocus)

Indicates that the views created by the ListAdapter can contain focusable items.

Parameters
itemsCanFocus boolean: true if items can get focus, false otherwise

setOverscrollFooter

Added in API level 9
void setOverscrollFooter (Drawable footer)

Sets the drawable that will be drawn below all other list content. This area can become visible when the user overscrolls the list, or when the list's content does not fully fill the container area.

Parameters
footer Drawable: The drawable to use

setOverscrollHeader

Added in API level 9
void setOverscrollHeader (Drawable header)

Sets the drawable that will be drawn above all other list content. This area can become visible when the user overscrolls the list.

Parameters
header Drawable: The drawable to use

setRemoteViewsAdapter

Added in API level 11
void setRemoteViewsAdapter (Intent intent)

Sets up this AbsListView to use a remote views adapter which connects to a RemoteViewsService through the specified intent.

Parameters
intent Intent: the intent used to identify the RemoteViewsService for the adapter to connect to.

setSelection

Added in API level 1
void setSelection (int position)

Sets the currently selected item. If in touch mode, the item will not be selected but it will still be positioned appropriately. If the specified selection position is less than 0, then the item at position 0 will be selected.

Parameters
position int: Index (starting at 0) of the data item to be selected.

setSelectionAfterHeaderView

Added in API level 1
void setSelectionAfterHeaderView ()

setSelectionAfterHeaderView set the selection to be the first list item after the header views.

smoothScrollByOffset

Added in API level 11
void smoothScrollByOffset (int offset)

Smoothly scroll to the specified adapter position offset. The view will scroll such that the indicated position is displayed.

Parameters
offset int: The amount to offset from the adapter position to scroll to.

smoothScrollToPosition

Added in API level 8
void smoothScrollToPosition (int position)

Smoothly scroll to the specified adapter position. The view will scroll such that the indicated position is displayed.

Parameters
position int: Scroll to this adapter position.

Protected methods

canAnimate

Added in API level 1
boolean canAnimate ()

Indicates whether the view group has the ability to animate its children after the first layout.

Returns
boolean true if the children can be animated, false otherwise

dispatchDraw

Added in API level 1
void dispatchDraw (Canvas canvas)

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 Canvas: the canvas on which to draw the view

drawChild

Added in API level 1
boolean drawChild (Canvas canvas, 
                View child, 
                long drawingTime)

Draw one child of this View Group. This method is responsible for getting the canvas in the right state. This includes clipping, translating so that the child's scrolled origin is at 0, 0, and applying any animation transformations.

Parameters
canvas Canvas: The canvas on which to draw the child
child View: Who to draw
drawingTime long: The time at which draw is occurring
Returns
boolean True if an invalidate() was issued

findViewTraversal

Added in API level 1
View findViewTraversal (int id)

Parameters
id int: the id of the view to be found
Returns
View the view of the specified id, null if cannot be found

findViewWithTagTraversal

Added in API level 1
View findViewWithTagTraversal (Object tag)

Parameters
tag Object: the tag of the view to be found
Returns
View the view of specified tag, null if cannot be found

layoutChildren

Added in API level 1
void layoutChildren ()

Subclasses must override this method to layout their children.

onDetachedFromWindow

Added in API level 1
void onDetachedFromWindow ()

This is called when the view is detached from a window. At this point it no longer has a surface for drawing.

onFinishInflate

Added in API level 1
void onFinishInflate ()

Finalize inflating a view from XML. This is called as the last phase of inflation, after all child views have been added.

Even if the subclass overrides onFinishInflate, they should always be sure to call the super method, so that we get called.

onFocusChanged

Added in API level 1
void onFocusChanged (boolean gainFocus, 
                int direction, 
                Rect previouslyFocusedRect)

Called by the view system when the focus state of this view changes. When the focus change event is caused by directional navigation, direction and previouslyFocusedRect provide insight into where the focus is coming from. When overriding, be sure to call up through to the super class so that the standard focus handling will occur.

Parameters
gainFocus boolean: True if the View has focus; false otherwise.
direction int: The direction focus has moved when requestFocus() is called to give this view focus. Values are FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, or FOCUS_BACKWARD. It may not always apply, in which case use the default.
previouslyFocusedRect Rect: The rectangle, in this view's coordinate system, of the previously focused view. If applicable, this will be passed in as finer grained information about where the focus is coming from (in addition to direction). Will be null otherwise.

onMeasure

Added in API level 1
void onMeasure (int widthMeasureSpec, 
                int heightMeasureSpec)

Measure the view and its content to determine the measured width and the measured height. This method is invoked by measure(int, int) and should be overridden by subclasses to provide accurate and efficient measurement of their contents.

CONTRACT: When overriding this method, you must call setMeasuredDimension(int, int) to store the measured width and height of this view. Failure to do so will trigger an IllegalStateException, thrown by measure(int, int). Calling the superclass' onMeasure(int, int) is a valid use.

The base class implementation of measure defaults to the background size, unless a larger size is allowed by the MeasureSpec. Subclasses should override onMeasure(int, int) to provide better measurements of their content.

If this method is overridden, it is the subclass's responsibility to make sure the measured height and width are at least the view's minimum height and width (getSuggestedMinimumHeight() and getSuggestedMinimumWidth()).

Parameters
widthMeasureSpec int: horizontal space requirements as imposed by the parent. The requirements are encoded with View.MeasureSpec.
heightMeasureSpec int: vertical space requirements as imposed by the parent. The requirements are encoded with View.MeasureSpec.

onSizeChanged

Added in API level 1
void onSizeChanged (int w, 
                int h, 
                int oldw, 
                int oldh)

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 int: Current width of this view.
h int: Current height of this view.
oldw int: Old width of this view.
oldh int: Old height of this view.
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