Summary: Methods | [Expand All]
public static interface

Window.Callback

android.view.Window.Callback
Known Indirect Subclasses

Class Overview

API from a Window back to its caller. This allows the client to intercept key dispatching, panels and menus, etc.

Summary

Public Methods
abstract boolean dispatchKeyEvent(KeyEvent event)
Called to process key events.
abstract boolean dispatchTouchEvent(MotionEvent event)
Called to process touch screen events.
abstract boolean dispatchTrackballEvent(MotionEvent event)
Called to process trackball events.
abstract void onContentChanged()
This hook is called whenever the content view of the screen changes (due to a call to Window.setContentView or Window.addContentView).
abstract boolean onCreatePanelMenu(int featureId, Menu menu)
Initialize the contents of the menu for panel 'featureId'.
abstract View onCreatePanelView(int featureId)
Instantiate the view to display in the panel for 'featureId'.
abstract boolean onMenuItemSelected(int featureId, MenuItem item)
Called when a panel's menu item has been selected by the user.
abstract boolean onMenuOpened(int featureId, Menu menu)
Called when a panel's menu is opened by the user.
abstract void onPanelClosed(int featureId, Menu menu)
Called when a panel is being closed.
abstract boolean onPreparePanel(int featureId, View view, Menu menu)
Prepare a panel to be displayed.
abstract boolean onSearchRequested()
Called when the user signals the desire to start a search.
abstract void onWindowAttributesChanged(WindowManager.LayoutParams attrs)
This is called whenever the current window attributes change.
abstract void onWindowFocusChanged(boolean hasFocus)
This hook is called whenever the window focus changes.

Public Methods

public abstract boolean dispatchKeyEvent (KeyEvent event)

Called to process key events. At the very least your implementation must call superDispatchKeyEvent(KeyEvent) to do the standard key processing.

Parameters
event The key event.
Returns
  • boolean Return true if this event was consumed.

public abstract boolean dispatchTouchEvent (MotionEvent event)

Called to process touch screen events. At the very least your implementation must call superDispatchTouchEvent(MotionEvent) to do the standard touch screen processing.

Parameters
event The touch screen event.
Returns
  • boolean Return true if this event was consumed.

public abstract boolean dispatchTrackballEvent (MotionEvent event)

Called to process trackball events. At the very least your implementation must call superDispatchTrackballEvent(MotionEvent) to do the standard trackball processing.

Parameters
event The trackball event.
Returns
  • boolean Return true if this event was consumed.

public abstract void onContentChanged ()

This hook is called whenever the content view of the screen changes (due to a call to Window.setContentView or Window.addContentView).

public abstract 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 The panel being created.
menu The menu inside the panel.
Returns
  • boolean You must return true for the panel to be displayed; if you return false it will not be shown.

public abstract 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 Which panel is being created.
Returns
  • view The top-level view to place in the panel.
See Also

public abstract boolean onMenuItemSelected (int featureId, MenuItem item)

Called when a panel's menu item has been selected by the user.

Parameters
featureId The panel that the menu is in.
item The menu item that was selected.
Returns
  • 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).

public abstract 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 The panel that the menu is in.
menu The menu that is opened.
Returns
  • Return true to allow the menu to open, or false to prevent the menu from opening.

public abstract 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 The panel that is being displayed.
menu If onCreatePanelView() returned null, this is the Menu being displayed in the panel.

public abstract 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 The panel that is being displayed.
view The View that was returned by onCreatePanelView().
menu If onCreatePanelView() returned null, this is the Menu being displayed in the panel.
Returns
  • boolean You must return true for the panel to be displayed; if you return false it will not be shown.
See Also

public abstract boolean onSearchRequested ()

Called when the user signals the desire to start a search.

Returns
  • true if search launched, false if activity refuses (blocks)
See Also

public abstract void onWindowAttributesChanged (WindowManager.LayoutParams attrs)

This is called whenever the current window attributes change.

public abstract void onWindowFocusChanged (boolean hasFocus)

This hook is called whenever the window focus changes.

Parameters
hasFocus Whether the window now has focus.