KeyEvent.Callback

android.view.KeyEvent.Callback

Known Indirect Subclasses

AbsListView, AbsSeekBar, AbsSpinner, AbsoluteLayout, AbstractInputMethodService, Activity, ActivityGroup, AdapterView<T extends Adapter>, AlertDialog, AliasActivity, AnalogClock, AppWidgetHostView, AutoCompleteTextView, Button, CharacterPickerDialog, CheckBox, CheckedTextView, Chronometer, CompoundButton, DatePicker, DatePickerDialog, DialerFilter, Dialog, DigitalClock, EditText, ExpandableListActivity, ExpandableListView, ExtractEditText, FrameLayout, GLSurfaceView, Gallery, GestureOverlayView, GridView, HorizontalScrollView, ImageButton, ImageSwitcher, ImageView, InputMethodService, KeyboardView, LauncherActivity, LinearLayout, ListActivity, ListView, MediaController, MultiAutoCompleteTextView, PreferenceActivity, ProgressBar, ProgressDialog, RadioButton, RadioGroup, RatingBar, RelativeLayout, ScrollView, SeekBar, SlidingDrawer, Spinner, SurfaceView, TabActivity, TabHost, TabWidget, TableLayout, TableRow, TextSwitcher, TextView, TimePicker, TimePickerDialog, ToggleButton, TwoLineListItem, VideoView, View, ViewAnimator, ViewFlipper, ViewGroup, ViewStub, ViewSwitcher, WebView, ZoomButton, ZoomControls

AbsListView	Base class that can be used to implement virtualized lists of items.
AbsSeekBar
AbsSpinner	An abstract base class for spinner widgets.
AbsoluteLayout	This class is deprecated. Use FrameLayout, RelativeLayout or a custom layout instead.
AbstractInputMethodService	AbstractInputMethodService provides a abstract base class for input methods.
Activity	An activity is a single, focused thing that the user can do.
ActivityGroup	A screen that contains and runs multiple embedded activities.
AdapterView<T extends Adapter>	An AdapterView is a view whose children are determined by an Adapter.
AlertDialog	A subclass of Dialog that can display one, two or three buttons.
AliasActivity	Stub activity that launches another activity (and then finishes itself) based on information in its component's manifest meta-data.
AnalogClock	This widget display an analogic clock with two hands for hours and minutes.
AppWidgetHostView	Provides the glue to show AppWidget views.
AutoCompleteTextView	An editable text view that shows completion suggestions automatically while the user is typing.
Button	`Button` represents a push-button widget.
CharacterPickerDialog	Dialog for choosing accented characters related to a base character.
CheckBox	A checkbox is a specific type of two-states button that can be either checked or unchecked.
CheckedTextView	An extension to TextView that supports the Checkable interface.
Chronometer	Class that implements a simple timer.
CompoundButton	A button with two states, checked and unchecked.
DatePicker	A view for selecting a month / year / day based on a calendar like layout.
DatePickerDialog	A simple dialog containing an DatePicker.
DialerFilter
Dialog	Base class for Dialogs.
DigitalClock	Like AnalogClock, but digital.
EditText	EditText is a thin veneer over TextView that configures itself to be editable.
ExpandableListActivity	An activity that displays an expandable list of items by binding to a data source implementing the ExpandableListAdapter, and exposes event handlers when the user selects an item.
ExpandableListView	A view that shows items in a vertically scrolling two-level list.
ExtractEditText	Specialization of EditText for showing and interacting with the extracted text in a full-screen input method.
FrameLayout	FrameLayout is designed to block out an area on the screen to display a single item.
GLSurfaceView	An implementation of SurfaceView that uses the dedicated surface for displaying OpenGL rendering.
Gallery	A view that shows items in a center-locked, horizontally scrolling list.
GestureOverlayView	A transparent overlay for gesture input that can be placed on top of other widgets or contain other widgets.
GridView	A view that shows items in two-dimensional scrolling grid.
HorizontalScrollView	Layout container for a view hierarchy that can be scrolled by the user, allowing it to be larger than the physical display.
ImageButton	Displays a button with an image (instead of text) that can be pressed or clicked by the user.
ImageSwitcher
ImageView	Displays an arbitrary image, such as an icon.
InputMethodService	InputMethodService provides a standard implementation of an InputMethod, which final implementations can derive from and customize.
KeyboardView	A view that renders a virtual Keyboard.
LauncherActivity	Displays a list of all activities which can be performed for a given intent.
LinearLayout	A Layout that arranges its children in a single column or a single row.
ListActivity	An activity that displays a list of items by binding to a data source such as an array or Cursor, and exposes event handlers when the user selects an item.
ListView	A view that shows items in a vertically scrolling list.
MediaController	A view containing controls for a MediaPlayer.
MultiAutoCompleteTextView	An editable text view, extending AutoCompleteTextView, that can show completion suggestions for the substring of the text where the user is typing instead of necessarily for the entire thing.
PreferenceActivity	Shows a hierarchy of Preference objects as lists, possibly spanning multiple screens.
ProgressBar	Visual indicator of progress in some operation.
ProgressDialog	A dialog showing a progress indicator and an optional text message or view.
RadioButton	A radio button is a two-states button that can be either checked or unchecked.
RadioGroup	This class is used to create a multiple-exclusion scope for a set of radio buttons.
RatingBar	A RatingBar is an extension of SeekBar and ProgressBar that shows a rating in stars.
RelativeLayout	A Layout where the positions of the children can be described in relation to each other or to the parent.
ScrollView	Layout container for a view hierarchy that can be scrolled by the user, allowing it to be larger than the physical display.
SeekBar	A SeekBar is an extension of ProgressBar that adds a draggable thumb.
SlidingDrawer	SlidingDrawer hides content out of the screen and allows the user to drag a handle to bring the content on screen.
Spinner	A view that displays one child at a time and lets the user pick among them.
SurfaceView	Provides a dedicated drawing surface embedded inside of a view hierarchy.
TabActivity	An activity that contains and runs multiple embedded activities or views.
TabHost	Container for a tabbed window view.
TabWidget	Displays a list of tab labels representing each page in the parent's tab collection.
TableLayout	A layout that arranges its children into rows and columns.
TableRow	A layout that arranges its children horizontally.
TextSwitcher	Specialized ViewSwitcher that contains only children of type TextView.
TextView	Displays text to the user and optionally allows them to edit it.
TimePicker	A view for selecting the time of day, in either 24 hour or AM/PM mode.
TimePickerDialog	A dialog that prompts the user for the time of day using a TimePicker.
ToggleButton	Displays checked/unchecked states as a button with a "light" indicator and by default accompanied with the text "ON" or "OFF".
TwoLineListItem	A view group with two children, intended for use in ListViews.
VideoView	Displays a video file.
View	This class represents the basic building block for user interface components.
ViewAnimator	Base class for a FrameLayout container that will perform animations when switching between its views.
ViewFlipper	Simple ViewAnimator that will animate between two or more views that have been added to it.
ViewGroup	A `ViewGroup` is a special view that can contain other views (called children.) The view group is the base class for layouts and views containers.
ViewStub	A ViewStub is an invisible, zero-sized View that can be used to lazily inflate layout resources at runtime.
ViewSwitcher	ViewAnimator that switches between two views, and has a factory from which these views are created.
WebView	A View that displays web pages.
ZoomButton
ZoomControls	The `ZoomControls` class displays a simple set of controls used for zooming and provides callbacks to register for events.

Summary

Public Methods
abstract boolean	onKeyDown(int keyCode, KeyEvent event) Called when a key down event has occurred.
abstract boolean	onKeyMultiple(int keyCode, int count, KeyEvent event) Called when multiple down/up pairs of the same key have occurred in a row.
abstract boolean	onKeyUp(int keyCode, KeyEvent event) Called when a key up event has occurred.

Public Methods

public abstract boolean onKeyDown (int keyCode, KeyEvent event)

Since: API Level 1

Called when a key down event has occurred.

Parameters

keyCode	The value in event.getKeyCode().
event	Description of the key event.

Returns

If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

public abstract boolean onKeyMultiple (int keyCode, int count, KeyEvent event)

Since: API Level 1

Called when multiple down/up pairs of the same key have occurred in a row.

Parameters

keyCode	The value in event.getKeyCode().
count	Number of pairs as returned by event.getRepeatCount().
event	Description of the key event.

Returns

If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

public abstract boolean onKeyUp (int keyCode, KeyEvent event)

Since: API Level 1

Called when a key up event has occurred.

Parameters

keyCode	The value in event.getKeyCode().
event	Description of the key event.

Returns

If you handled the event, return true. If you want to allow the event to be handled by the next receiver, return false.

Interfaces

Classes

Enums

Exceptions

KeyEvent.Callback

Summary

Public Methods

public abstract boolean onKeyDown (int keyCode, KeyEvent event)

Parameters

Returns

public abstract boolean onKeyMultiple (int keyCode, int count, KeyEvent event)

Parameters

Returns

public abstract boolean onKeyUp (int keyCode, KeyEvent event)

Parameters

Returns