Added in API level 14

ActionProvider


abstract class ActionProvider
kotlin.Any
   ↳ android.view.ActionProvider

An ActionProvider defines rich menu interaction in a single component. ActionProvider can generate action views for use in the action bar, dynamically populate submenus of a MenuItem, and handle default menu item invocations.

An ActionProvider can be optionally specified for a MenuItem and will be responsible for creating the action view that appears in the android.app.ActionBar in place of a simple button in the bar. When the menu item is presented in a way that does not allow custom action views, (e.g. in an overflow menu,) the ActionProvider can perform a default action.

There are two ways to use an action provider:

  • Set the action provider on a MenuItem directly by calling MenuItem#setActionProvider(ActionProvider).
  • Declare the action provider in an XML menu resource. For example:
    <code>
        &lt;item android:id="@+id/my_menu_item"
          android:title="Title"
          android:icon="@drawable/my_menu_item_icon"
          android:showAsAction="ifRoom"
          android:actionProviderClass="foo.bar.SomeActionProvider" /&gt;
      </code>

Summary

Nested classes
abstract

Listens to changes in visibility as reported by ActionProvider#refreshVisibility().

Public constructors

Creates a new instance.

Public methods
open Boolean

Determines if this ActionProvider has a submenu associated with it.

open Boolean

If overridesItemVisibility() returns true, the return value of this method will help determine the visibility of the MenuItem this ActionProvider is bound to.

abstract View

Factory method called by the Android framework to create new action views.

open View

Factory method called by the Android framework to create new action views.

open Boolean

Performs an optional default action.

open Unit

Called to prepare an associated submenu for the menu item backed by this ActionProvider.

open Boolean

The result of this method determines whether or not isVisible() will be used by the MenuItem this ActionProvider is bound to help determine its visibility.

open Unit

If this ActionProvider is associated with an item in a menu, refresh the visibility of the item based on overridesItemVisibility() and isVisible().

open Unit

Set a listener to be notified when this ActionProvider's overridden visibility changes.

Public constructors

ActionProvider

Added in API level 14
ActionProvider(context: Context)

Creates a new instance. ActionProvider classes should always implement a constructor that takes a single Context parameter for inflating from menu XML.

Parameters
context Context: Context for accessing resources. This value cannot be null.

Public methods

hasSubMenu

Added in API level 14
open fun hasSubMenu(): Boolean

Determines if this ActionProvider has a submenu associated with it.

Associated submenus will be shown when an action view is not. This provider instance will receive a call to onPrepareSubMenu(android.view.SubMenu) after the call to onPerformDefaultAction() and before a submenu is displayed to the user.

Return
Boolean true if the item backed by this provider should have an associated submenu

isVisible

Added in API level 16
open fun isVisible(): Boolean

If overridesItemVisibility() returns true, the return value of this method will help determine the visibility of the MenuItem this ActionProvider is bound to.

If the MenuItem's visibility is explicitly set to false by the application, the MenuItem will not be shown, even if this method returns true.

Return
Boolean true if the MenuItem this ActionProvider is bound to is visible, false if it is invisible. The default implementation returns true.

onCreateActionView

Added in API level 14
Deprecated in API level 16
abstract fun onCreateActionView(): View

Deprecated: use onCreateActionView(android.view.MenuItem)

Factory method called by the Android framework to create new action views.

This method has been deprecated in favor of onCreateActionView(android.view.MenuItem). Newer apps that wish to support platform versions prior to API 16 should also implement this method to return a valid action view.

Return
View A new action view. This value cannot be null.

onCreateActionView

Added in API level 16
open fun onCreateActionView(forItem: MenuItem): View

Factory method called by the Android framework to create new action views. This method returns a new action view for the given MenuItem.

If your ActionProvider implementation overrides the deprecated no-argument overload onCreateActionView(), overriding this method for devices running API 16 or later is recommended but optional. The default implementation calls onCreateActionView() for compatibility with applications written for older platform versions.

Parameters
forItem MenuItem: MenuItem to create the action view for This value cannot be null.
Return
View the new action view This value cannot be null.

onPerformDefaultAction

Added in API level 14
open fun onPerformDefaultAction(): Boolean

Performs an optional default action.

For the case of an action provider placed in a menu item not shown as an action this method is invoked if previous callbacks for processing menu selection has handled the event.

A menu item selection is processed in the following order:

The default implementation does not perform any action and returns false.

onPrepareSubMenu

Added in API level 14
open fun onPrepareSubMenu(subMenu: SubMenu): Unit

Called to prepare an associated submenu for the menu item backed by this ActionProvider.

if hasSubMenu() returns true, this method will be called when the menu item is selected to prepare the submenu for presentation to the user. Apps may use this to create or alter submenu content right before display.

Parameters
subMenu SubMenu: Submenu that will be displayed This value cannot be null.

overridesItemVisibility

Added in API level 16
open fun overridesItemVisibility(): Boolean

The result of this method determines whether or not isVisible() will be used by the MenuItem this ActionProvider is bound to help determine its visibility.

Return
Boolean true if this ActionProvider overrides the visibility of the MenuItem it is bound to, false otherwise. The default implementation returns false.

See Also

refreshVisibility

Added in API level 16
open fun refreshVisibility(): Unit

If this ActionProvider is associated with an item in a menu, refresh the visibility of the item based on overridesItemVisibility() and isVisible(). If overridesItemVisibility() returns false, this call will have no effect.

setVisibilityListener

Added in API level 16
open fun setVisibilityListener(listener: ActionProvider.VisibilityListener?): Unit

Set a listener to be notified when this ActionProvider's overridden visibility changes. This should only be used by MenuItem implementations.

Parameters
listener ActionProvider.VisibilityListener?: listener to set This value may be null.