WindowId

Kotlin |Java

open class WindowId : Parcelable

kotlin.Any
↳	android.view.WindowId

Safe identifier for a window. This currently allows you to retrieve and observe the input focus state of the window. Most applications will not use this, instead relying on the simpler (and more efficient) methods available on View. This classes is useful when window input interactions need to be done across processes: the class itself is a Parcelable that can be passed to other processes for them to interact with your window, and it provides a limited safe API that doesn't allow the other process to negatively harm your window.

Summary

Nested classes
abstract	`FocusObserver` Subclass for observing changes to the focus state of an `WindowId`.

Inherited constants

From class Parcelable

Int

CONTENTS_FILE_DESCRIPTOR

Descriptor bit used with describeContents(): indicates that the Parcelable object's flattened representation includes a file descriptor.

Int

PARCELABLE_WRITE_RETURN_VALUE

Flag for use with writeToParcel: the object being written is a return value, that is the result of a function such as "Parcelable someFunction()", "void someFunction(out Parcelable)", or "void someFunction(inout Parcelable)". Some implementations may want to release resources at this point.

Public methods
open Int	`describeContents()`
open Boolean	`equals(other: Any?)` Comparison operator on two IntentSender objects, such that true is returned then they both represent the same operation from the same package.
open Int	`hashCode()`
open Boolean	`isFocused()` Retrieve the current focus state of the associated window.
open Unit	`registerFocusObserver(observer: WindowId.FocusObserver!)` Start monitoring for changes in the focus state of the window.
open String	`toString()`
open Unit	`unregisterFocusObserver(observer: WindowId.FocusObserver!)` Stop monitoring changes in the focus state of the window.
open Unit	`writeToParcel(out: Parcel, flags: Int)`

Properties
static Parcelable.Creator<WindowId!>	`CREATOR`

Public methods

describeContents

Added in API level 18

open fun describeContents(): Int

Return
`Int`	a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either `0` or `android.os.Parcelable#CONTENTS_FILE_DESCRIPTOR`

equals

Added in API level 18

open fun equals(other: Any?): Boolean

Comparison operator on two IntentSender objects, such that true is returned then they both represent the same operation from the same package.

Parameters
`obj`	the reference object with which to compare.
`otherObj`	This value may be `null`.

Return
`Boolean`	`true` if this object is the same as the obj argument; `false` otherwise.

hashCode

Added in API level 18

open fun hashCode(): Int

Return
`Int`	a hash code value for this object.

isFocused

Added in API level 18

open fun isFocused(): Boolean

Retrieve the current focus state of the associated window.

registerFocusObserver

Added in API level 18

open fun registerFocusObserver(observer: WindowId.FocusObserver!): Unit

Start monitoring for changes in the focus state of the window.

toString

Added in API level 18

open fun toString(): String

Return
`String`	a string representation of the object.

unregisterFocusObserver

Added in API level 18

open fun unregisterFocusObserver(observer: WindowId.FocusObserver!): Unit

Stop monitoring changes in the focus state of the window.

writeToParcel

Added in API level 18

open fun writeToParcel(
    out: Parcel, 
    flags: Int
): Unit

Parameters
`dest`	The Parcel in which the object should be written. This value cannot be `null`.
`flags`	Int: Additional flags about how the object should be written. May be 0 or `PARCELABLE_WRITE_RETURN_VALUE`. Value is either `0` or a combination of `android.os.Parcelable#PARCELABLE_WRITE_RETURN_VALUE`, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES

Properties

CREATOR

Added in API level 18

static val CREATOR: Parcelable.Creator<WindowId!>