DisplayManager

DISPLAY_CATEGORY_PRESENTATION

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 such as HDMI or Wireless displays. Applications may automatically project their content to presentation displays to provide richer second screen experiences.

Constant Value: "android.hardware.display.category.PRESENTATION"

VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR

int VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR

Virtual display flag: Allows content to be mirrored on private displays when no content is being shown.

This flag is mutually exclusive with VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY. If both flags are specified then the own-content only behavior will be applied.

The behavior of this flag is implied whenever VIRTUAL_DISPLAY_FLAG_PUBLIC is set and VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY has not been set. This flag is only required to override the default behavior when creating a private display.

Creating an auto-mirroing virtual display requires the CAPTURE_VIDEO_OUTPUT or CAPTURE_SECURE_VIDEO_OUTPUT permission. These permissions are reserved for use by system components and are not available to third-party applications. Alternatively, an appropriate MediaProjection may be used to create an auto-mirroring virtual display.

Constant Value: 16 (0x00000010)

VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY

int VIRTUAL_DISPLAY_FLAG_OWN_CONTENT_ONLY

Virtual display flag: Only show this display's own content; do not mirror the content of another display.

This flag is used in conjunction with VIRTUAL_DISPLAY_FLAG_PUBLIC. Ordinarily public virtual displays will automatically mirror the content of the default display if they have no windows of their own. When this flag is specified, the virtual display will only ever show its own content and will be blanked instead if it has no windows.

This flag is mutually exclusive with VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR. If both flags are specified then the own-content only behavior will be applied.

This behavior of this flag is implied whenever neither VIRTUAL_DISPLAY_FLAG_PUBLIC nor VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR have been set. This flag is only required to override the default behavior when creating a public display.

Constant Value: 8 (0x00000008)

VIRTUAL_DISPLAY_FLAG_PRESENTATION

int VIRTUAL_DISPLAY_FLAG_PRESENTATION

Virtual display flag: Create a presentation display.

Presentation virtual displays

When this flag is set, the virtual display is registered as a presentation display in the presentation display category. Applications may automatically project their content to presentation displays to provide richer second screen experiences.

Non-presentation virtual displays

When this flag is not set, the virtual display is not registered as a presentation display. Applications can still project their content on the display but they will typically not do so automatically. This option is appropriate for more special-purpose displays.

Constant Value: 2 (0x00000002)

VIRTUAL_DISPLAY_FLAG_PUBLIC

int VIRTUAL_DISPLAY_FLAG_PUBLIC

Virtual display flag: Create a public display.

Public virtual displays

When this flag is set, the virtual display is public.

A public virtual display behaves just like most any other display that is connected to the system such as an HDMI or Wireless display. Applications can open windows on the display and the system may mirror the contents of other displays onto it.

Creating a public virtual display that isn't restricted to own-content only implicitly creates an auto-mirroring display. See VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR for restrictions on who is allowed to create an auto-mirroring display.

Private virtual displays

When this flag is not set, the virtual display is private as defined by the FLAG_PRIVATE display flag.

A private virtual display belongs to the application that created it. Only the a owner of a private virtual display is allowed to place windows upon it. The private virtual display also does not participate in display mirroring: it will neither receive mirrored content from another display nor allow its own content to be mirrored elsewhere. More precisely, the only processes that are allowed to enumerate or interact with the private display are those that have the same UID as the application that originally created the private virtual display.

Constant Value: 1 (0x00000001)

VIRTUAL_DISPLAY_FLAG_SECURE

int VIRTUAL_DISPLAY_FLAG_SECURE

Virtual display flag: Create a secure display.

Secure virtual displays

When this flag is set, the virtual display is considered secure as defined by the FLAG_SECURE display flag. The caller promises to take reasonable measures, such as over-the-air encryption, to prevent the contents of the display from being intercepted or recorded on a persistent medium.

Creating a secure virtual display requires the CAPTURE_SECURE_VIDEO_OUTPUT permission. This permission is reserved for use by system components and is not available to third-party applications.

Non-secure virtual displays

When this flag is not set, the virtual display is considered unsecure. The content of secure windows will be blanked if shown on this display.

Constant Value: 4 (0x00000004)

createVirtualDisplay

VirtualDisplay createVirtualDisplay (String name, 
                int width, 
                int height, 
                int densityDpi, 
                Surface surface, 
                int flags)

Creates a virtual display.

createVirtualDisplay

VirtualDisplay createVirtualDisplay (String name, 
                int width, 
                int height, 
                int densityDpi, 
                Surface surface, 
                int flags, 
                VirtualDisplay.Callback callback, 
                Handler handler)

Creates a virtual display.

The content of a virtual display is rendered to a Surface provided by the application.

The virtual display should be released when no longer needed. Because a virtual display renders to a surface provided by the application, it will be released automatically when the process terminates and all remaining windows on it will be forcibly removed.

The behavior of the virtual display depends on the flags that are provided to this method. By default, virtual displays are created to be private, non-presentation and unsecure. Permissions may be required to use certain flags.

As of KITKAT_WATCH, the surface may be attached or detached dynamically using setSurface(Surface). Previously, the surface had to be non-null when createVirtualDisplay(String, int, int, int, Surface, int) was called and could not be changed for the lifetime of the display.

Detaching the surface that backs a virtual display has a similar effect to turning off the screen.

getDisplay

Display getDisplay (int displayId)

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

getDisplays

Display[] getDisplays ()

Gets all currently valid logical displays.

getDisplays

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.

registerDisplayListener

void registerDisplayListener (DisplayManager.DisplayListener listener, 
                Handler handler)

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

unregisterDisplayListener

void unregisterDisplayListener (DisplayManager.DisplayListener listener)

Unregisters a display listener.