IT. Expert System.

public final class DisplayManager
extends Object

• Nested Class Summary

  Nested Classes

  Modifier and Type	Class and Description
  static interface	DisplayManager.DisplayListener Listens for changes in available display devices.

• Field Summary

  Fields

  Modifier and Type	Field and Description
  static String	ACTION_WIFI_DISPLAY_STATUS_CHANGED Broadcast receiver that indicates when the Wifi display status changes.
  static String	DISPLAY_CATEGORY_PRESENTATION Display category: Presentation displays.
  static String	EXTRA_WIFI_DISPLAY_STATUS Contains a WifiDisplayStatus object.

• Constructor Summary

  Constructors

  Constructor and Description
  DisplayManager(Context context)

• Method Summary

  Methods

  Modifier and Type	Method and Description
  void	connectWifiDisplay(String deviceAddress) Connects to a Wifi display.
  void	disconnectWifiDisplay() Disconnects from the current Wifi display.
  void	forgetWifiDisplay(String deviceAddress) Forgets a previously remembered Wifi display.
  Display	getDisplay(int displayId) Gets information about a logical display.
  Display[]	getDisplays() Gets all currently valid logical displays.
  Display[]	getDisplays(String category) Gets all currently valid logical displays of the specified category.
  WifiDisplayStatus	getWifiDisplayStatus() Gets the current Wifi display status.
  void	registerDisplayListener(DisplayManager.DisplayListener listener, Handler handler) Registers an display listener to receive notifications about when displays are added, removed or changed.
  void	renameWifiDisplay(String deviceAddress, String alias) Renames a Wifi display.
  void	scanWifiDisplays() Initiates a fresh scan of availble Wifi displays.
  void	unregisterDisplayListener(DisplayManager.DisplayListener listener) Unregisters an input device listener.

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Field Detail

  • ACTION_WIFI_DISPLAY_STATUS_CHANGED

    public static final String ACTION_WIFI_DISPLAY_STATUS_CHANGED

    Broadcast receiver that indicates when the Wifi display status changes.

    The status is provided as a WifiDisplayStatus object in the EXTRA_WIFI_DISPLAY_STATUS extra.

    This broadcast is only sent to registered receivers and can only be sent by the system.

    See Also:

    Constant Field Values

  • EXTRA_WIFI_DISPLAY_STATUS

    public static final String EXTRA_WIFI_DISPLAY_STATUS

    Contains a WifiDisplayStatus object.

    See Also:

    Constant Field Values

  • DISPLAY_CATEGORY_PRESENTATION

    public static final String DISPLAY_CATEGORY_PRESENTATION

    Display category: Presentation displays.

    This category can be used to identify secondary displays that are suitable for use as presentation displays.

    See Also:

    for information about presenting content on secondary displays., getDisplays(String), Constant Field Values

• Constructor Detail

  • DisplayManager

    public DisplayManager(Context context)

• Method Detail

  • getDisplay

    public Display getDisplay(int displayId)

    Gets information about a logical display. The display metrics may be adjusted to provide compatibility for legacy applications.

    Parameters:

    displayId - The logical display id.

    Returns:

    The display object, or null if there is no valid display with the given id.

  • getDisplays

    public Display[] getDisplays()

    Gets all currently valid logical displays.

    Returns:

    An array containing all displays.

  • getDisplays

    public Display[] getDisplays(String category)

    Gets all currently valid logical displays of the specified category.

    When there are multiple displays in a category the returned displays are sorted of preference. For example, if the requested category is DISPLAY_CATEGORY_PRESENTATION and there are multiple presentation displays then the displays are sorted so that the first display in the returned array is the most preferred presentation display. The application may simply use the first display or allow the user to choose.

    Parameters:

    category - The requested display category or null to return all displays.

    Returns:

    An array containing all displays sorted by order of preference.

    See Also:

    DISPLAY_CATEGORY_PRESENTATION

  • registerDisplayListener

    public void registerDisplayListener(DisplayManager.DisplayListener listener,
                               Handler handler)

    Registers an display listener to receive notifications about when displays are added, removed or changed.

    Parameters:

    listener - The listener to register.

    handler - The handler on which the listener should be invoked, or null if the listener should be invoked on the calling thread's looper.

    See Also:

    unregisterDisplayListener(android.hardware.display.DisplayManager.DisplayListener)

  • unregisterDisplayListener

    public void unregisterDisplayListener(DisplayManager.DisplayListener listener)

    Unregisters an input device listener.

    Parameters:

    listener - The listener to unregister.

    See Also:

    registerDisplayListener(android.hardware.display.DisplayManager.DisplayListener, android.os.Handler)

  • scanWifiDisplays

    public void scanWifiDisplays()

    Initiates a fresh scan of availble Wifi displays. The results are sent as a ACTION_WIFI_DISPLAY_STATUS_CHANGED broadcast.

  • connectWifiDisplay

    public void connectWifiDisplay(String deviceAddress)

    Connects to a Wifi display. The results are sent as a ACTION_WIFI_DISPLAY_STATUS_CHANGED broadcast.

    Automatically remembers the display after a successful connection, if not already remembered.

    Requires android.Manifest.permission#CONFIGURE_WIFI_DISPLAY to connect to unknown displays. No permissions are required to connect to already known displays.

    Parameters:

    deviceAddress - The MAC address of the device to which we should connect.

  • disconnectWifiDisplay

    public void disconnectWifiDisplay()

    Disconnects from the current Wifi display. The results are sent as a ACTION_WIFI_DISPLAY_STATUS_CHANGED broadcast.

  • renameWifiDisplay

    public void renameWifiDisplay(String deviceAddress,
                         String alias)

    Renames a Wifi display.

    The display must already be remembered for this call to succeed. In other words, we must already have successfully connected to the display at least once and then not forgotten it.

    Requires android.Manifest.permission#CONFIGURE_WIFI_DISPLAY.

    Parameters:

    deviceAddress - The MAC address of the device to rename.

    alias - The alias name by which to remember the device, or null or empty if no alias should be used.

  • forgetWifiDisplay

    public void forgetWifiDisplay(String deviceAddress)

    Forgets a previously remembered Wifi display.

    Automatically disconnects from the display if currently connected to it.

    Requires android.Manifest.permission#CONFIGURE_WIFI_DISPLAY.

    Parameters:

    deviceAddress - The MAC address of the device to forget.

  • getWifiDisplayStatus

    public WifiDisplayStatus getWifiDisplayStatus()

    Gets the current Wifi display status. Watch for changes in the status by registering a broadcast receiver for ACTION_WIFI_DISPLAY_STATUS_CHANGED.

    Returns:

    The current Wifi display status.