Dialog
public
class
Dialog
extends Object
implements
DialogInterface,
KeyEvent.Callback,
View.OnCreateContextMenuListener,
Window.Callback
java.lang.Object | |
↳ | android.app.Dialog |
Base class for Dialogs.
Note: Activities provide a facility to manage the creation, saving and
restoring of dialogs. See Activity.onCreateDialog(int)
,
Activity.onPrepareDialog(int, Dialog)
,
Activity.showDialog(int)
, and Activity.dismissDialog(int)
. If
these methods are used, getOwnerActivity()
will return the Activity
that managed this dialog.
Often you will want to have a Dialog display on top of the current
input method, because there is no reason for it to accept text. You can
do this by setting the WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM
window flag (assuming
your Dialog takes input focus, as it the default) with the following code:
getWindow().setFlags(WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM, WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM);
Developer Guides
For more information about creating dialogs, read the Dialogs developer guide.
Summary
Inherited constants |
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Public constructors | |
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Dialog(Context context)
Creates a dialog window that uses the default dialog theme. |
|
Dialog(Context context, int themeResId)
Creates a dialog window that uses a custom dialog style. |
Protected constructors | |
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Dialog(Context context, boolean cancelable, DialogInterface.OnCancelListener cancelListener)
|
Public methods | |
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void
|
addContentView(View view, ViewGroup.LayoutParams params)
Add an additional content view to the screen. |
void
|
cancel()
Cancel the dialog. |
void
|
closeOptionsMenu()
|
void
|
create()
Forces immediate creation of the dialog. |
void
|
dismiss()
Dismiss this dialog, removing it from the screen. |
boolean
|
dispatchGenericMotionEvent(MotionEvent ev)
Called to process generic motion events. |
boolean
|
dispatchKeyEvent(KeyEvent event)
Called to process key events. |
boolean
|
dispatchKeyShortcutEvent(KeyEvent event)
Called to process a key shortcut event. |
boolean
|
dispatchPopulateAccessibilityEvent(AccessibilityEvent event)
Called to process population of |
boolean
|
dispatchTouchEvent(MotionEvent ev)
Called to process touch screen events. |
boolean
|
dispatchTrackballEvent(MotionEvent ev)
Called to process trackball events. |
<T extends View>
T
|
findViewById(int id)
Finds the first descendant view with the given ID or |
ActionBar
|
getActionBar()
Retrieve the |
final
Context
|
getContext()
Retrieve the Context this Dialog is running in. |
View
|
getCurrentFocus()
Call |
LayoutInflater
|
getLayoutInflater()
|
OnBackInvokedDispatcher
|
getOnBackInvokedDispatcher()
Returns the |
final
Activity
|
getOwnerActivity()
Returns the Activity that owns this Dialog. |
final
SearchEvent
|
getSearchEvent()
During the onSearchRequested() callbacks, this function will return the
|
final
int
|
getVolumeControlStream()
|
Window
|
getWindow()
Retrieve the current Window for the activity. |
void
|
hide()
Hide the dialog, but do not dismiss it. |
void
|
invalidateOptionsMenu()
|
boolean
|
isShowing()
|
void
|
onActionModeFinished(ActionMode mode)
Called when an action mode has been finished. Note that if you override this method you should always call through to the superclass implementation by calling super.onActionModeFinished(mode). |
void
|
onActionModeStarted(ActionMode mode)
Called when an action mode has been started. Note that if you override this method you should always call through to the superclass implementation by calling super.onActionModeStarted(mode). |
void
|
onAttachedToWindow()
Called when the window has been attached to the window manager. |
void
|
onBackPressed()
This method was deprecated
in API level 33.
Use
Starting from Android 13 (API level 33), back event handling is
moving to an ahead-of-time model and |
void
|
onContentChanged()
This hook is called whenever the content view of the screen changes
(due to a call to
|
boolean
|
onContextItemSelected(MenuItem item)
|
void
|
onContextMenuClosed(Menu menu)
|
void
|
onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
Called when the context menu for this view is being built. |
boolean
|
onCreateOptionsMenu(Menu menu)
It is usually safe to proxy this call to the owner activity's
|
boolean
|
onCreatePanelMenu(int featureId, Menu menu)
Initialize the contents of the menu for panel 'featureId'. |
View
|
onCreatePanelView(int featureId)
Instantiate the view to display in the panel for 'featureId'. |
void
|
onDetachedFromWindow()
Called when the window has been detached from the window manager. |
boolean
|
onGenericMotionEvent(MotionEvent event)
Called when a generic motion event was not handled by any of the views inside of the dialog. |
boolean
|
onKeyDown(int keyCode, KeyEvent event)
A key was pressed down. |
boolean
|
onKeyLongPress(int keyCode, KeyEvent event)
Default implementation of |
boolean
|
onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
Default implementation of |
boolean
|
onKeyShortcut(int keyCode, KeyEvent event)
Called when a key shortcut event is not handled by any of the views in the Dialog. |
boolean
|
onKeyUp(int keyCode, KeyEvent event)
A key was released. |
boolean
|
onMenuItemSelected(int featureId, MenuItem item)
Called when a panel's menu item has been selected by the user. |
boolean
|
onMenuOpened(int featureId, Menu menu)
Called when a panel's menu is opened by the user. |
boolean
|
onOptionsItemSelected(MenuItem item)
|
void
|
onOptionsMenuClosed(Menu menu)
|
void
|
onPanelClosed(int featureId, Menu menu)
Called when a panel is being closed. |
boolean
|
onPrepareOptionsMenu(Menu menu)
It is usually safe to proxy this call to the owner activity's
|
boolean
|
onPreparePanel(int featureId, View view, Menu menu)
Prepare a panel to be displayed. |
void
|
onRestoreInstanceState(Bundle savedInstanceState)
Restore the state of the dialog from a previously saved bundle. |
Bundle
|
onSaveInstanceState()
Saves the state of the dialog into a bundle. |
boolean
|
onSearchRequested(SearchEvent searchEvent)
This hook is called when the user signals the desire to start a search. |
boolean
|
onSearchRequested()
This hook is called when the user signals the desire to start a search. |
boolean
|
onTouchEvent(MotionEvent event)
Called when a touch screen event was not handled by any of the views under it. |
boolean
|
onTrackballEvent(MotionEvent event)
Called when the trackball was moved and not handled by any of the views inside of the activity. |
void
|
onWindowAttributesChanged(WindowManager.LayoutParams params)
This is called whenever the current window attributes change. |
void
|
onWindowFocusChanged(boolean hasFocus)
This hook is called whenever the window focus changes. |
ActionMode
|
onWindowStartingActionMode(ActionMode.Callback callback)
Called when an action mode is being started for this window. |
ActionMode
|
onWindowStartingActionMode(ActionMode.Callback callback, int type)
Called when an action mode is being started for this window. |
void
|
openContextMenu(View view)
|
void
|
openOptionsMenu()
|
void
|
registerForContextMenu(View view)
|
final
boolean
|
requestWindowFeature(int featureId)
Enable extended window features. |
final
<T extends View>
T
|
requireViewById(int id)
Finds the first descendant view with the given ID or throws an IllegalArgumentException if
the ID is invalid (< 0), there is no matching view in the hierarchy, or the dialog has not
yet been fully created (for example, via |
void
|
setCancelMessage(Message msg)
Set a message to be sent when the dialog is canceled. |
void
|
setCancelable(boolean flag)
Sets whether this dialog is cancelable with the
|
void
|
setCanceledOnTouchOutside(boolean cancel)
Sets whether this dialog is canceled when touched outside the window's bounds. |
void
|
setContentView(int layoutResID)
Set the screen content from a layout resource. |
void
|
setContentView(View view, ViewGroup.LayoutParams params)
Set the screen content to an explicit view. |
void
|
setContentView(View view)
Set the screen content to an explicit view. |
void
|
setDismissMessage(Message msg)
Set a message to be sent when the dialog is dismissed. |
final
void
|
setFeatureDrawable(int featureId, Drawable drawable)
Convenience for calling
|
final
void
|
setFeatureDrawableAlpha(int featureId, int alpha)
Convenience for calling
|
final
void
|
setFeatureDrawableResource(int featureId, int resId)
Convenience for calling
|
final
void
|
setFeatureDrawableUri(int featureId, Uri uri)
Convenience for calling
|
void
|
setOnCancelListener(DialogInterface.OnCancelListener listener)
Set a listener to be invoked when the dialog is canceled. |
void
|
setOnDismissListener(DialogInterface.OnDismissListener listener)
Set a listener to be invoked when the dialog is dismissed. |
void
|
setOnKeyListener(DialogInterface.OnKeyListener onKeyListener)
Sets the callback that will be called if a key is dispatched to the dialog. |
void
|
setOnShowListener(DialogInterface.OnShowListener listener)
Sets a listener to be invoked when the dialog is shown. |
final
void
|
setOwnerActivity(Activity activity)
Sets the Activity that owns this dialog. |
void
|
setTitle(CharSequence title)
Set the title text for this dialog's window. |
void
|
setTitle(int titleId)
Set the title text for this dialog's window. |
final
void
|
setVolumeControlStream(int streamType)
By default, this will use the owner Activity's suggested stream type. |
void
|
show()
Start the dialog and display it on screen. |
void
|
takeKeyEvents(boolean get)
Request that key events come to this dialog. |
void
|
unregisterForContextMenu(View view)
|
Protected methods | |
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void
|
onCreate(Bundle savedInstanceState)
Similar to |
void
|
onStart()
Called when the dialog is starting. |
void
|
onStop()
Called to tell you that you're stopping. |
Inherited methods | |
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Public constructors
Dialog
public Dialog (Context context)
Creates a dialog window that uses the default dialog theme.
The supplied context
is used to obtain the window manager and
base theme used to present the dialog.
Parameters | |
---|---|
context |
Context : the context in which the dialog should run
This value cannot be null . |
See also:
Dialog
public Dialog (Context context, int themeResId)
Creates a dialog window that uses a custom dialog style.
The supplied context
is used to obtain the window manager and
base theme used to present the dialog.
The supplied theme
is applied on top of the context's theme. See
Style and Theme Resources for more information about defining and
using styles.
Parameters | |
---|---|
context |
Context : the context in which the dialog should run
This value cannot be null . |
themeResId |
int : a style resource describing the theme to use for the
window, or 0 to use the default dialog theme |
Protected constructors
Dialog
protected Dialog (Context context, boolean cancelable, DialogInterface.OnCancelListener cancelListener)
Parameters | |
---|---|
context |
Context : This value cannot be null . |
cancelable |
boolean |
cancelListener |
DialogInterface.OnCancelListener : This value may be null . |
Public methods
addContentView
public void addContentView (View view, ViewGroup.LayoutParams params)
Add an additional content view to the screen. Added after any existing ones in the screen -- existing views are NOT removed.
Parameters | |
---|---|
view |
View : The desired content to display.
This value cannot be null . |
params |
ViewGroup.LayoutParams : Layout parameters for the view.
This value may be null . |
cancel
public void cancel ()
Cancel the dialog. This is essentially the same as calling dismiss()
, but it will
also call your DialogInterface.OnCancelListener
(if registered).
create
public void create ()
Forces immediate creation of the dialog.
Note that you should not override this method to perform dialog creation.
Rather, override onCreate(android.os.Bundle)
.
dismiss
public void dismiss ()
Dismiss this dialog, removing it from the screen. This method can be
invoked safely from any thread. Note that you should not override this
method to do cleanup when the dialog is dismissed, instead implement
that in onStop()
.
dispatchGenericMotionEvent
public boolean dispatchGenericMotionEvent (MotionEvent ev)
Called to process generic motion events. You can override this to intercept all generic motion events before they are dispatched to the window. Be sure to call this implementation for generic motion events that should be handled normally.
Parameters | |
---|---|
ev |
MotionEvent : The generic motion event.
This value cannot be null . |
Returns | |
---|---|
boolean |
boolean Return true if this event was consumed. |
dispatchKeyEvent
public boolean dispatchKeyEvent (KeyEvent event)
Called to process key events. You can override this to intercept all key events before they are dispatched to the window. Be sure to call this implementation for key events that should be handled normally.
Parameters | |
---|---|
event |
KeyEvent : The key event.
This value cannot be null . |
Returns | |
---|---|
boolean |
boolean Return true if this event was consumed. |
dispatchKeyShortcutEvent
public boolean dispatchKeyShortcutEvent (KeyEvent event)
Called to process a key shortcut event. You can override this to intercept all key shortcut events before they are dispatched to the window. Be sure to call this implementation for key shortcut events that should be handled normally.
Parameters | |
---|---|
event |
KeyEvent : The key shortcut event.
This value cannot be null . |
Returns | |
---|---|
boolean |
True if this event was consumed. |
dispatchPopulateAccessibilityEvent
public boolean dispatchPopulateAccessibilityEvent (AccessibilityEvent event)
Called to process population of AccessibilityEvent
s.
Parameters | |
---|---|
event |
AccessibilityEvent : This value cannot be null . |
Returns | |
---|---|
boolean |
boolean Return true if event population was completed. |
dispatchTouchEvent
public boolean dispatchTouchEvent (MotionEvent ev)
Called to process touch screen events. You can override this to intercept all touch screen events before they are dispatched to the window. Be sure to call this implementation for touch screen events that should be handled normally.
Parameters | |
---|---|
ev |
MotionEvent : The touch screen event.
This value cannot be null . |
Returns | |
---|---|
boolean |
boolean Return true if this event was consumed. |
dispatchTrackballEvent
public boolean dispatchTrackballEvent (MotionEvent ev)
Called to process trackball events. You can override this to intercept all trackball events before they are dispatched to the window. Be sure to call this implementation for trackball events that should be handled normally.
Parameters | |
---|---|
ev |
MotionEvent : The trackball event.
This value cannot be null . |
Returns | |
---|---|
boolean |
boolean Return true if this event was consumed. |
findViewById
public T findViewById (int id)
Finds the first descendant view with the given ID or null
if the
ID is invalid (< 0), there is no matching view in the hierarchy, or the
dialog has not yet been fully created (for example, via show()
or create()
).
Note: In most cases -- depending on compiler support -- the resulting view is automatically cast to the target class type. If the target class type is unconstrained, an explicit cast may be necessary.
Parameters | |
---|---|
id |
int : the ID to search for |
Returns | |
---|---|
T |
a view with given ID if found, or null otherwise |
getActionBar
public ActionBar getActionBar ()
Retrieve the ActionBar
attached to this dialog, if present.
Returns | |
---|---|
ActionBar |
The ActionBar attached to the dialog or null if no ActionBar is present. |
getContext
public final Context getContext ()
Retrieve the Context this Dialog is running in.
Returns | |
---|---|
Context |
Context The Context used by the Dialog.
This value cannot be null . |
getCurrentFocus
public View getCurrentFocus ()
Call Window.getCurrentFocus()
on the
Window if this Activity to return the currently focused view.
Returns | |
---|---|
View |
View The current View with focus or null. |
See also:
getLayoutInflater
public LayoutInflater getLayoutInflater ()
Returns | |
---|---|
LayoutInflater |
This value cannot be null . |
getOnBackInvokedDispatcher
public OnBackInvokedDispatcher getOnBackInvokedDispatcher ()
Returns the OnBackInvokedDispatcher
instance associated with the window that this
dialog is attached to.
Returns | |
---|---|
OnBackInvokedDispatcher |
This value cannot be null . |
getOwnerActivity
public final Activity getOwnerActivity ()
Returns the Activity that owns this Dialog. For example, if
Activity.showDialog(int)
is used to show this Dialog, that
Activity will be the owner (by default). Depending on how this dialog was
created, this may return null.
Returns | |
---|---|
Activity |
The Activity that owns this Dialog. |
getSearchEvent
public final SearchEvent getSearchEvent ()
During the onSearchRequested() callbacks, this function will return the
SearchEvent
that triggered the callback, if it exists.
Returns | |
---|---|
SearchEvent |
SearchEvent The SearchEvent that triggered the onSearchRequested() callback.
This value may be null . |
getVolumeControlStream
public final int getVolumeControlStream ()
Returns | |
---|---|
int |
See also:
getWindow
public Window getWindow ()
Retrieve the current Window for the activity. This can be used to directly access parts of the Window API that are not available through Activity/Screen.
Returns | |
---|---|
Window |
Window The current window, or null if the activity is not visual. |
isShowing
public boolean isShowing ()
Returns | |
---|---|
boolean |
Whether the dialog is currently showing. |
onActionModeFinished
public void onActionModeFinished (ActionMode mode)
Called when an action mode has been finished. The appropriate mode callback
method will have already been invoked.
Note that if you override this method you should always call through
to the superclass implementation by calling super.onActionModeFinished(mode).
If you override this method you must call through to the
superclass implementation.
Parameters | |
---|---|
mode |
ActionMode : The mode that was just finished. |
onActionModeStarted
public void onActionModeStarted (ActionMode mode)
Called when an action mode has been started. The appropriate mode callback
method will have already been invoked.
Note that if you override this method you should always call through
to the superclass implementation by calling super.onActionModeStarted(mode).
If you override this method you must call through to the
superclass implementation.
Parameters | |
---|---|
mode |
ActionMode : The new mode that has just been started. |
onAttachedToWindow
public void onAttachedToWindow ()
Called when the window has been attached to the window manager.
See View.onAttachedToWindow()
for more information.
onBackPressed
public void onBackPressed ()
This method was deprecated
in API level 33.
Use OnBackInvokedCallback
or
androidx.activity.OnBackPressedCallback
to handle back navigation instead.
Starting from Android 13 (API level 33), back event handling is
moving to an ahead-of-time model and onBackPressed()
and
KeyEvent.KEYCODE_BACK
should not be used to handle back events (back gesture or
back button click). Instead, an OnBackInvokedCallback
should be registered using
Dialog.getOnBackInvokedDispatcher()
.registerOnBackInvokedCallback(priority, callback)
.
Called when the dialog has detected the user's press of the back key. The default implementation simply cancels the dialog (only if it is cancelable), but you can override this to do whatever you want.
If you target version Build.VERSION_CODES.TIRAMISU
or later, you
should not use this method but register an OnBackInvokedCallback
on an
OnBackInvokedDispatcher
that you can retrieve using
getOnBackInvokedDispatcher()
. You should also set
android:enableOnBackInvokedCallback="true"
in the application manifest.
Alternatively, you
can use androidx.activity.ComponentDialog#getOnBackPressedDispatcher()
for backward compatibility.
onContentChanged
public void onContentChanged ()
This hook is called whenever the content view of the screen changes
(due to a call to
Window.setContentView
or
Window.addContentView
).
onContextItemSelected
public boolean onContextItemSelected (MenuItem item)
Parameters | |
---|---|
item |
MenuItem : This value cannot be null . |
Returns | |
---|---|
boolean |
See also:
onContextMenuClosed
public void onContextMenuClosed (Menu menu)
Parameters | |
---|---|
menu |
Menu : This value cannot be null . |
See also:
onCreateContextMenu
public void onCreateContextMenu (ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo)
Called when the context menu for this view is being built. It is not safe to hold onto the menu after this method returns.
Parameters | |
---|---|
menu |
ContextMenu : The context menu that is being built |
v |
View : The view for which the context menu is being built |
menuInfo |
ContextMenu.ContextMenuInfo : Extra information about the item for which the
context menu should be shown. This information will vary
depending on the class of v. |
onCreateOptionsMenu
public boolean onCreateOptionsMenu (Menu menu)
It is usually safe to proxy this call to the owner activity's
Activity.onCreateOptionsMenu(Menu)
if the client desires the same
menu for this Dialog.
Parameters | |
---|---|
menu |
Menu : This value cannot be null . |
Returns | |
---|---|
boolean |
onCreatePanelMenu
public boolean onCreatePanelMenu (int featureId, Menu menu)
Initialize the contents of the menu for panel 'featureId'. This is called if onCreatePanelView() returns null, giving you a standard menu in which you can place your items. It is only called once for the panel, the first time it is shown.
You can safely hold on to menu (and any items created from it), making modifications to it as desired, until the next time onCreatePanelMenu() is called for this feature.
Parameters | |
---|---|
featureId |
int : The panel being created. |
menu |
Menu : This value cannot be null . |
Returns | |
---|---|
boolean |
boolean You must return true for the panel to be displayed; if you return false it will not be shown. |
See also:
onCreatePanelView
public View onCreatePanelView (int featureId)
Instantiate the view to display in the panel for 'featureId'. You can return null, in which case the default content (typically a menu) will be created for you.
Parameters | |
---|---|
featureId |
int : Which panel is being created. |
Returns | |
---|---|
View |
view The top-level view to place in the panel. |
See also:
onDetachedFromWindow
public void onDetachedFromWindow ()
Called when the window has been detached from the window manager.
See View.onDetachedFromWindow()
for more information.
onGenericMotionEvent
public boolean onGenericMotionEvent (MotionEvent event)
Called when a generic motion event was not handled by any of the views inside of the dialog.
Generic motion events describe joystick movements, mouse hovers, track pad
touches, scroll wheel movements and other input events. The
source
of the motion event specifies
the class of input that was received. Implementations of this method
must examine the bits in the source before processing the event.
The following code example shows how this is done.
Generic motion events with source class
InputDevice.SOURCE_CLASS_POINTER
are delivered to the view under the pointer. All other generic motion events are
delivered to the focused view.
See View.onGenericMotionEvent(MotionEvent)
for an example of how to
handle this event.
Parameters | |
---|---|
event |
MotionEvent : The generic motion event being processed.
This value cannot be null . |
Returns | |
---|---|
boolean |
Return true if you have consumed the event, false if you haven't. The default implementation always returns false. |
onKeyDown
public boolean onKeyDown (int keyCode, KeyEvent event)
A key was pressed down.
If the focused view didn't want this event, this method is called.
Default implementation consumes KEYCODE_BACK
and, as of P
, KEYCODE_ESCAPE
to later handle them in onKeyUp(int, KeyEvent)
.
Parameters | |
---|---|
keyCode |
int : The value in event.getKeyCode(). |
event |
KeyEvent : This value cannot be null . |
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. |
See also:
onKeyLongPress
public boolean onKeyLongPress (int keyCode, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyLongPress()
: always returns false (doesn't handle
the event).
Parameters | |
---|---|
keyCode |
int : The value in event.getKeyCode(). |
event |
KeyEvent : This value cannot be null . |
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
public boolean onKeyMultiple (int keyCode, int repeatCount, KeyEvent event)
Default implementation of KeyEvent.Callback.onKeyMultiple()
: always returns false (doesn't handle
the event).
Parameters | |
---|---|
keyCode |
int : The value in event.getKeyCode(). |
repeatCount |
int : Number of pairs as returned by event.getRepeatCount(). |
event |
KeyEvent : This value cannot be null . |
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. |
onKeyShortcut
public boolean onKeyShortcut (int keyCode, KeyEvent event)
Called when a key shortcut event is not handled by any of the views in the Dialog.
Override this method to implement global key shortcuts for the Dialog.
Key shortcuts can also be implemented by setting the
shortcut
property of menu items.
Parameters | |
---|---|
keyCode |
int : The value in event.getKeyCode(). |
event |
KeyEvent : Description of the key event.
This value cannot be null . |
Returns | |
---|---|
boolean |
True if the key shortcut was handled. |
onKeyUp
public boolean onKeyUp (int keyCode, KeyEvent event)
A key was released.
Default implementation consumes KEYCODE_BACK
and, as of P
, KEYCODE_ESCAPE
to close the dialog.
Parameters | |
---|---|
keyCode |
int : The value in event.getKeyCode(). |
event |
KeyEvent : This value cannot be null . |
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. |
See also:
onMenuItemSelected
public boolean onMenuItemSelected (int featureId, MenuItem item)
Called when a panel's menu item has been selected by the user.
Parameters | |
---|---|
featureId |
int : The panel that the menu is in. |
item |
MenuItem : This value cannot be null . |
Returns | |
---|---|
boolean |
boolean Return true to finish processing of selection, or false to perform the normal menu handling (calling its Runnable or sending a Message to its target Handler). |
onMenuOpened
public boolean onMenuOpened (int featureId, Menu menu)
Called when a panel's menu is opened by the user. This may also be called when the menu is changing from one type to another (for example, from the icon menu to the expanded menu).
Parameters | |
---|---|
featureId |
int : The panel that the menu is in. |
menu |
Menu : This value cannot be null . |
Returns | |
---|---|
boolean |
Return true to allow the menu to open, or false to prevent the menu from opening. |
See also:
onOptionsItemSelected
public boolean onOptionsItemSelected (MenuItem item)
Parameters | |
---|---|
item |
MenuItem : This value cannot be null . |
Returns | |
---|---|
boolean |
See also:
onOptionsMenuClosed
public void onOptionsMenuClosed (Menu menu)
Parameters | |
---|---|
menu |
Menu : This value cannot be null . |
See also:
onPanelClosed
public void onPanelClosed (int featureId, Menu menu)
Called when a panel is being closed. If another logical subsequent panel is being opened (and this panel is being closed to make room for the subsequent panel), this method will NOT be called.
Parameters | |
---|---|
featureId |
int : The panel that is being displayed. |
menu |
Menu : This value cannot be null . |
See also:
onPrepareOptionsMenu
public boolean onPrepareOptionsMenu (Menu menu)
It is usually safe to proxy this call to the owner activity's
Activity.onPrepareOptionsMenu(Menu)
if the client desires the
same menu for this Dialog.
Parameters | |
---|---|
menu |
Menu : This value cannot be null . |
Returns | |
---|---|
boolean |
onPreparePanel
public boolean onPreparePanel (int featureId, View view, Menu menu)
Prepare a panel to be displayed. This is called right before the panel window is shown, every time it is shown.
Parameters | |
---|---|
featureId |
int : The panel that is being displayed. |
view |
View : This value may be null . |
menu |
Menu : This value cannot be null . |
Returns | |
---|---|
boolean |
boolean You must return true for the panel to be displayed; if you return false it will not be shown. |
See also:
onRestoreInstanceState
public void onRestoreInstanceState (Bundle savedInstanceState)
Restore the state of the dialog from a previously saved bundle.
The default implementation restores the state of the dialog's view
hierarchy that was saved in the default implementation of onSaveInstanceState()
,
so be sure to call through to super when overriding unless you want to
do all restoring of state yourself.
Parameters | |
---|---|
savedInstanceState |
Bundle : The state of the dialog previously saved by
onSaveInstanceState() .
This value cannot be null . |
onSaveInstanceState
public Bundle onSaveInstanceState ()
Saves the state of the dialog into a bundle. The default implementation saves the state of its view hierarchy, so you'll likely want to call through to super if you override this to save additional state.
Returns | |
---|---|
Bundle |
A bundle with the state of the dialog.
This value cannot be null . |
onSearchRequested
public boolean onSearchRequested (SearchEvent searchEvent)
This hook is called when the user signals the desire to start a search.
Parameters | |
---|---|
searchEvent |
SearchEvent : This value cannot be null . |
Returns | |
---|---|
boolean |
true if search launched, false if activity refuses (blocks) |
onSearchRequested
public boolean onSearchRequested ()
This hook is called when the user signals the desire to start a search.
Returns | |
---|---|
boolean |
true if search launched, false if activity refuses (blocks) |
onTouchEvent
public boolean onTouchEvent (MotionEvent event)
Called when a touch screen event was not handled by any of the views under it. This is most useful to process touch events that happen outside of your window bounds, where there is no view to receive it.
Parameters | |
---|---|
event |
MotionEvent : The touch screen event being processed.
This value cannot be null . |
Returns | |
---|---|
boolean |
Return true if you have consumed the event, false if you haven't. The default implementation will cancel the dialog when a touch happens outside of the window bounds. |
onTrackballEvent
public boolean onTrackballEvent (MotionEvent event)
Called when the trackball was moved and not handled by any of the views inside of the activity. So, for example, if the trackball moves while focus is on a button, you will receive a call here because buttons do not normally do anything with trackball events. The call here happens before trackball movements are converted to DPAD key events, which then get sent back to the view hierarchy, and will be processed at the point for things like focus navigation.
Parameters | |
---|---|
event |
MotionEvent : The trackball event being processed.
This value cannot be null . |
Returns | |
---|---|
boolean |
Return true if you have consumed the event, false if you haven't. The default implementation always returns false. |
onWindowAttributesChanged
public void onWindowAttributesChanged (WindowManager.LayoutParams params)
This is called whenever the current window attributes change.
Parameters | |
---|---|
params |
WindowManager.LayoutParams |
onWindowFocusChanged
public void onWindowFocusChanged (boolean hasFocus)
This hook is called whenever the window focus changes. See
View.onWindowFocusChangedNotLocked(boolean)
for more information.
Parameters | |
---|---|
hasFocus |
boolean : Whether the window now has focus. |
onWindowStartingActionMode
public ActionMode onWindowStartingActionMode (ActionMode.Callback callback)
Called when an action mode is being started for this window. Gives the
callback an opportunity to handle the action mode in its own unique and
beautiful way. If this method returns null the system can choose a way
to present the mode or choose not to start the mode at all. This is equivalent
to onWindowStartingActionMode(android.view.ActionMode.Callback, int)
with type ActionMode.TYPE_PRIMARY
.
Parameters | |
---|---|
callback |
ActionMode.Callback : Callback to control the lifecycle of this action mode |
Returns | |
---|---|
ActionMode |
The ActionMode that was started, or null if the system should present it |
onWindowStartingActionMode
public ActionMode onWindowStartingActionMode (ActionMode.Callback callback, int type)
Called when an action mode is being started for this window. Gives the callback an opportunity to handle the action mode in its own unique and beautiful way. If this method returns null the system can choose a way to present the mode or choose not to start the mode at all.
Parameters | |
---|---|
callback |
ActionMode.Callback : Callback to control the lifecycle of this action mode |
type |
int : One of ActionMode.TYPE_PRIMARY or ActionMode.TYPE_FLOATING . |
Returns | |
---|---|
ActionMode |
The ActionMode that was started, or null if the system should present it |
openContextMenu
public void openContextMenu (View view)
Parameters | |
---|---|
view |
View : This value cannot be null . |
See also:
registerForContextMenu
public void registerForContextMenu (View view)
Parameters | |
---|---|
view |
View : This value cannot be null . |
See also:
requestWindowFeature
public final boolean requestWindowFeature (int featureId)
Enable extended window features. This is a convenience for calling
getWindow().requestFeature()
.
Parameters | |
---|---|
featureId |
int : The desired feature as defined in
Window . |
Returns | |
---|---|
boolean |
Returns true if the requested feature is supported and now enabled. |
See also:
requireViewById
public final T requireViewById (int id)
Finds the first descendant view with the given ID or throws an IllegalArgumentException if
the ID is invalid (< 0), there is no matching view in the hierarchy, or the dialog has not
yet been fully created (for example, via show()
or create()
).
Note: In most cases -- depending on compiler support -- the resulting view is automatically cast to the target class type. If the target class type is unconstrained, an explicit cast may be necessary.
Parameters | |
---|---|
id |
int : the ID to search for |
Returns | |
---|---|
T |
a view with given ID
This value cannot be null . |
setCancelMessage
public void setCancelMessage (Message msg)
Set a message to be sent when the dialog is canceled.
Parameters | |
---|---|
msg |
Message : The msg to send when the dialog is canceled.
This value may be null . |
setCancelable
public void setCancelable (boolean flag)
Sets whether this dialog is cancelable with the
BACK
key.
Parameters | |
---|---|
flag |
boolean |
setCanceledOnTouchOutside
public void setCanceledOnTouchOutside (boolean cancel)
Sets whether this dialog is canceled when touched outside the window's bounds. If setting to true, the dialog is set to be cancelable if not already set.
Parameters | |
---|---|
cancel |
boolean : Whether the dialog should be canceled when touched outside
the window. |
setContentView
public void setContentView (int layoutResID)
Set the screen content from a layout resource. The resource will be inflated, adding all top-level views to the screen.
Parameters | |
---|---|
layoutResID |
int : Resource ID to be inflated. |
setContentView
public void setContentView (View view, ViewGroup.LayoutParams params)
Set the screen content to an explicit view. This view is placed directly into the screen's view hierarchy. It can itself be a complex view hierarchy.
Parameters | |
---|---|
view |
View : The desired content to display.
This value cannot be null . |
params |
ViewGroup.LayoutParams : Layout parameters for the view.
This value may be null . |
setContentView
public void setContentView (View view)
Set the screen content to an explicit view. This view is placed directly into the screen's view hierarchy. It can itself be a complex view hierarchy.
Parameters | |
---|---|
view |
View : The desired content to display.
This value cannot be null . |
setDismissMessage
public void setDismissMessage (Message msg)
Set a message to be sent when the dialog is dismissed.
Parameters | |
---|---|
msg |
Message : The msg to send when the dialog is dismissed.
This value may be null . |
setFeatureDrawable
public final void setFeatureDrawable (int featureId, Drawable drawable)
Convenience for calling
Window.setFeatureDrawable(int, Drawable)
.
Parameters | |
---|---|
featureId |
int |
drawable |
Drawable : This value may be null . |
setFeatureDrawableAlpha
public final void setFeatureDrawableAlpha (int featureId, int alpha)
Convenience for calling
Window.setFeatureDrawableAlpha(int, int)
.
Parameters | |
---|---|
featureId |
int |
alpha |
int |
setFeatureDrawableResource
public final void setFeatureDrawableResource (int featureId, int resId)
Convenience for calling
Window.setFeatureDrawableResource(int, int)
.
Parameters | |
---|---|
featureId |
int |
resId |
int |
setFeatureDrawableUri
public final void setFeatureDrawableUri (int featureId, Uri uri)
Convenience for calling
Window.setFeatureDrawableUri(int, Uri)
.
Parameters | |
---|---|
featureId |
int |
uri |
Uri : This value may be null . |
setOnCancelListener
public void setOnCancelListener (DialogInterface.OnCancelListener listener)
Set a listener to be invoked when the dialog is canceled.
This will only be invoked when the dialog is canceled.
Cancel events alone will not capture all ways that
the dialog might be dismissed. If the creator needs
to know when a dialog is dismissed in general, use
setOnDismissListener(OnDismissListener)
.
Parameters | |
---|---|
listener |
DialogInterface.OnCancelListener : The DialogInterface.OnCancelListener to use.
This value may be null . |
setOnDismissListener
public void setOnDismissListener (DialogInterface.OnDismissListener listener)
Set a listener to be invoked when the dialog is dismissed.
Parameters | |
---|---|
listener |
DialogInterface.OnDismissListener : The DialogInterface.OnDismissListener to use.
This value may be null . |
setOnKeyListener
public void setOnKeyListener (DialogInterface.OnKeyListener onKeyListener)
Sets the callback that will be called if a key is dispatched to the dialog.
Parameters | |
---|---|
onKeyListener |
DialogInterface.OnKeyListener : This value may be null . |
setOnShowListener
public void setOnShowListener (DialogInterface.OnShowListener listener)
Sets a listener to be invoked when the dialog is shown.
Parameters | |
---|---|
listener |
DialogInterface.OnShowListener : The DialogInterface.OnShowListener to use.
This value may be null . |
setOwnerActivity
public final void setOwnerActivity (Activity activity)
Sets the Activity that owns this dialog. An example use: This Dialog will use the suggested volume control stream of the Activity.
Parameters | |
---|---|
activity |
Activity : The Activity that owns this dialog.
This value cannot be null . |
setTitle
public void setTitle (CharSequence title)
Set the title text for this dialog's window.
Parameters | |
---|---|
title |
CharSequence : The new text to display in the title.
This value may be null . |
setTitle
public void setTitle (int titleId)
Set the title text for this dialog's window. The text is retrieved from the resources with the supplied identifier.
Parameters | |
---|---|
titleId |
int : the title's text resource identifier |
setVolumeControlStream
public final void setVolumeControlStream (int streamType)
By default, this will use the owner Activity's suggested stream type.
Parameters | |
---|---|
streamType |
int |
show
public void show ()
Start the dialog and display it on screen. The window is placed in the
application layer and opaque. Note that you should not override this
method to do initialization when the dialog is shown, instead implement
that in onStart()
.
takeKeyEvents
public void takeKeyEvents (boolean get)
Request that key events come to this dialog. Use this if your dialog has no views with focus, but the dialog still wants a chance to process key events.
Parameters | |
---|---|
get |
boolean : true if the dialog should receive key events, false otherwise |
See also:
unregisterForContextMenu
public void unregisterForContextMenu (View view)
Parameters | |
---|---|
view |
View : This value cannot be null . |
See also:
Protected methods
onCreate
protected void onCreate (Bundle savedInstanceState)
Similar to Activity.onCreate
, you should initialize your dialog
in this method, including calling setContentView(View)
.
Parameters | |
---|---|
savedInstanceState |
Bundle : If this dialog is being reinitialized after a
the hosting activity was previously shut down, holds the result from
the most recent call to onSaveInstanceState() , or null if this
is the first time. |