Summary: Methods

WindowBackend

Kotlin |Java

public interface WindowBackend

androidx.window.WindowBackend

Known indirect subclasses

ExtensionWindowBackend Default implementation of WindowBackend that uses a combination of platform APIs and device-dependent OEM extensions.

Backing interface for WindowManager instances that server as the default information supplier. By default ExtensionWindowBackend implementation is used in WindowManager.WindowManager(Context, WindowBackend), but it can be replaced with a stub for testing.

Summary

Public methods
`abstract DeviceState`	`getDeviceState()` Get the current device state.
`abstract WindowLayoutInfo`	`getWindowLayoutInfo(Context context)` Get current window layout information for the provided `Context`.
`abstract void`	`registerDeviceStateChangeCallback(Executor executor, Consumer<DeviceState> callback)` Register a callback for device state changes.
`abstract void`	`registerLayoutChangeCallback(Context context, Executor executor, Consumer<WindowLayoutInfo> callback)` Register a callback for layout changes of the window of the current visual `Context`.
`abstract void`	`unregisterDeviceStateChangeCallback(Consumer<DeviceState> callback)` Unregister a callback for device state changes.
`abstract void`	`unregisterLayoutChangeCallback(Consumer<WindowLayoutInfo> callback)` Unregister a callback for window layout changes of the `Context` window.

Public methods

getDeviceState

public abstract DeviceState getDeviceState ()

Get the current device state.

Returns
`DeviceState`

getWindowLayoutInfo

public abstract WindowLayoutInfo getWindowLayoutInfo (Context context)

Get current window layout information for the provided Context. Must be called only after the it is attached to the window and the layout pass has happened.

Parameters
`context`	`Context`

Returns
`WindowLayoutInfo`

registerDeviceStateChangeCallback

public abstract void registerDeviceStateChangeCallback (Executor executor, 
                Consumer<DeviceState> callback)

Parameters
`executor`	`Executor`
`callback`	`Consumer`

registerLayoutChangeCallback

public abstract void registerLayoutChangeCallback (Context context, 
                Executor executor, 
                Consumer<WindowLayoutInfo> callback)

Register a callback for layout changes of the window of the current visual Context. Must be called only after the it is attached to the window.

Parameters
`context`	`Context`
`executor`	`Executor`
`callback`	`Consumer`

unregisterDeviceStateChangeCallback

public abstract void unregisterDeviceStateChangeCallback (Consumer<DeviceState> callback)

Unregister a callback for device state changes.

Parameters
`callback`	`Consumer`

unregisterLayoutChangeCallback

public abstract void unregisterLayoutChangeCallback (Consumer<WindowLayoutInfo> callback)

Unregister a callback for window layout changes of the Context window.

Parameters
`callback`	`Consumer`