Android APIs
public class

WindowId

extends Object
implements Parcelable
java.lang.Object
   ↳ android.view.WindowId

Class Overview

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
class WindowId.FocusObserver Subclass for observing changes to the focus state of an WindowId
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Inherited Constants
From interface android.os.Parcelable
Fields
public static final Creator<WindowId> CREATOR
Public Methods
int describeContents()
Describe the kinds of special objects contained in this Parcelable's marshalled representation.
boolean equals(Object otherObj)
Comparison operator on two IntentSender objects, such that true is returned then they both represent the same operation from the same package.
int hashCode()
Returns an integer hash code for this object.
boolean isFocused()
Retrieve the current focus state of the associated window.
void registerFocusObserver(WindowId.FocusObserver observer)
Start monitoring for changes in the focus state of the window.
String toString()
Returns a string containing a concise, human-readable description of this object.
void unregisterFocusObserver(WindowId.FocusObserver observer)
Stop monitoring changes in the focus state of the window.
void writeToParcel(Parcel out, int flags)
Flatten this object in to a Parcel.
[Expand]
Inherited Methods
From class java.lang.Object
From interface android.os.Parcelable

Fields

public static final Creator<WindowId> CREATOR

Added in API level 18

Public Methods

public int describeContents ()

Added in API level 18

Describe the kinds of special objects contained in this Parcelable's marshalled representation.

Returns
int a bitmask indicating the set of special object types marshalled by the Parcelable.

public boolean equals (Object otherObj)

Added in API level 18

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

Parameters
otherObj Object: the object to compare this instance with.
Returns
boolean true if the specified object is equal to this Object; false otherwise.

public int hashCode ()

Added in API level 18

Returns an integer hash code for this object. By contract, any two objects for which equals(Object) returns true must return the same hash code value. This means that subclasses of Object usually override both methods or neither method.

Note that hash values must not change over time unless information used in equals comparisons also changes.

See Writing a correct hashCode method if you intend implementing your own hashCode method.

Returns
int this object's hash code.

public boolean isFocused ()

Added in API level 18

Retrieve the current focus state of the associated window.

Returns
boolean

public void registerFocusObserver (WindowId.FocusObserver observer)

Added in API level 18

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

Parameters
observer WindowId.FocusObserver

public String toString ()

Added in API level 18

Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression:

   getClass().getName() + '@' + Integer.toHexString(hashCode())

See Writing a useful toString method if you intend implementing your own toString method.

Returns
String a printable representation of this object.

public void unregisterFocusObserver (WindowId.FocusObserver observer)

Added in API level 18

Stop monitoring changes in the focus state of the window.

Parameters
observer WindowId.FocusObserver

public void writeToParcel (Parcel out, int flags)

Added in API level 18

Flatten this object in to a Parcel.

Parameters
out Parcel: The Parcel in which the object should be written.
flags int: Additional flags about how the object should be written. May be 0 or PARCELABLE_WRITE_RETURN_VALUE.