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WindowId.FocusObserver
public
static
abstract
class
WindowId.FocusObserver
extends Object
Subclass for observing changes to the focus state of an WindowId.
You should use the same instance of this class for observing multiple
WindowId objects, since this class is fairly heavy-weight -- the
base class includes all of the mechanisms for connecting to and receiving updates
from the window.
Summary
Public methods |
|---|
abstract
void
|
onFocusGained(WindowId token)
Called when one of the monitored windows gains input focus.
|
abstract
void
|
onFocusLost(WindowId token)
Called when one of the monitored windows loses input focus.
|
Inherited methods |
|---|
From class
java.lang.Object
Object
|
clone()
Creates and returns a copy of this object.
|
boolean
|
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
void
|
finalize()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
final
Class<?>
|
getClass()
Returns the runtime class of this Object.
|
int
|
hashCode()
Returns a hash code value for the object.
|
final
void
|
notify()
Wakes up a single thread that is waiting on this object's
monitor.
|
final
void
|
notifyAll()
Wakes up all threads that are waiting on this object's monitor.
|
String
|
toString()
Returns a string representation of the object.
|
final
void
|
wait(long timeoutMillis, int nanos)
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted, or until a
certain amount of real time has elapsed.
|
final
void
|
wait(long timeoutMillis)
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted, or until a
certain amount of real time has elapsed.
|
final
void
|
wait()
Causes the current thread to wait until it is awakened, typically
by being notified or interrupted.
|
|
Public constructors
FocusObserver
public FocusObserver ()
Construct a new observer. This observer will be configured so that all
of its callbacks are dispatched on the current calling thread.
Public methods
onFocusGained
public abstract void onFocusGained (WindowId token)
Called when one of the monitored windows gains input focus.
| Parameters |
|---|
token |
WindowId |
onFocusLost
public abstract void onFocusLost (WindowId token)
Called when one of the monitored windows loses input focus.
| Parameters |
|---|
token |
WindowId |
Content and code samples on this page are subject to the licenses described in the Content License. Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
Last updated 2025-02-10 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-02-10 UTC."],[],[],null,["# WindowId.FocusObserver\n\nAdded in [API level 18](/guide/topics/manifest/uses-sdk-element#ApiLevels) \nSummary: [Ctors](#pubctors) \\| [Methods](#pubmethods) \\| [Inherited Methods](#inhmethods) \n\nWindowId.FocusObserver\n======================\n\n*** ** * ** ***\n\n[Kotlin](/reference/kotlin/android/view/WindowId.FocusObserver \"View this page in Kotlin\") \\|Java\n\n\n`\npublic\nstatic\n\nabstract\nclass\nWindowId.FocusObserver\n`\n\n\n`\n\nextends `[Object](/reference/java/lang/Object)`\n\n\n`\n\n`\n\n\n`\n\n|---|-------------------------------------|\n| [java.lang.Object](/reference/java/lang/Object) ||\n| ↳ | android.view.WindowId.FocusObserver |\n\n\u003cbr /\u003e\n\n*** ** * ** ***\n\nSubclass for observing changes to the focus state of an [WindowId](/reference/android/view/WindowId).\nYou should use the same instance of this class for observing multiple\n[WindowId](/reference/android/view/WindowId) objects, since this class is fairly heavy-weight -- the\nbase class includes all of the mechanisms for connecting to and receiving updates\nfrom the window.\n\nSummary\n-------\n\n| ### Public constructors ||\n|-------------------------------------------------------------------------------------------------------------------|---|\n| ` `[FocusObserver](/reference/android/view/WindowId.FocusObserver#FocusObserver())`() ` Construct a new observer. |\n\n| ### Public methods ||\n|------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| ` abstract void` | ` `[onFocusGained](/reference/android/view/WindowId.FocusObserver#onFocusGained(android.view.WindowId))`(`[WindowId](/reference/android/view/WindowId)` token) ` Called when one of the monitored windows gains input focus. |\n| ` abstract void` | ` `[onFocusLost](/reference/android/view/WindowId.FocusObserver#onFocusLost(android.view.WindowId))`(`[WindowId](/reference/android/view/WindowId)` token) ` Called when one of the monitored windows loses input focus. |\n\n| ### Inherited methods |\n|-----------------------|---|\n| From class ` `[java.lang.Object](/reference/java/lang/Object)` ` |---------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[Object](/reference/java/lang/Object) | ` `[clone](/reference/java/lang/Object#clone())`() ` Creates and returns a copy of this object. | | ` boolean` | ` `[equals](/reference/java/lang/Object#equals(java.lang.Object))`(`[Object](/reference/java/lang/Object)` obj) ` Indicates whether some other object is \"equal to\" this one. | | ` void` | ` `[finalize](/reference/java/lang/Object#finalize())`() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final `[Class](/reference/java/lang/Class)`\u003c?\u003e` | ` `[getClass](/reference/java/lang/Object#getClass())`() ` Returns the runtime class of this `Object`. | | ` int` | ` `[hashCode](/reference/java/lang/Object#hashCode())`() ` Returns a hash code value for the object. | | ` final void` | ` `[notify](/reference/java/lang/Object#notify())`() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` `[notifyAll](/reference/java/lang/Object#notifyAll())`() ` Wakes up all threads that are waiting on this object's monitor. | | ` `[String](/reference/java/lang/String) | ` `[toString](/reference/java/lang/Object#toString())`() ` Returns a string representation of the object. | | ` final void` | ` `[wait](/reference/java/lang/Object#wait(long,%20int))`(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](/reference/java/lang/Object#wait(long))`(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](/reference/java/lang/Object#wait())`() ` Causes the current thread to wait until it is awakened, typically by being *notified* or *interrupted*. | ||\n\nPublic constructors\n-------------------\n\n### FocusObserver\n\nAdded in [API level 18](/guide/topics/manifest/uses-sdk-element#ApiLevels) \n\n```\npublic FocusObserver ()\n```\n\nConstruct a new observer. This observer will be configured so that all\nof its callbacks are dispatched on the current calling thread.\n\n\u003cbr /\u003e\n\nPublic methods\n--------------\n\n### onFocusGained\n\nAdded in [API level 18](/guide/topics/manifest/uses-sdk-element#ApiLevels) \n\n```\npublic abstract void onFocusGained (WindowId token)\n```\n\nCalled when one of the monitored windows gains input focus.\n\n\u003cbr /\u003e\n\n| Parameters ||\n|---------|-------------------|\n| `token` | `WindowId` \u003cbr /\u003e |\n\n### onFocusLost\n\nAdded in [API level 18](/guide/topics/manifest/uses-sdk-element#ApiLevels) \n\n```\npublic abstract void onFocusLost (WindowId token)\n```\n\nCalled when one of the monitored windows loses input focus.\n\n\u003cbr /\u003e\n\n| Parameters ||\n|---------|-------------------|\n| `token` | `WindowId` \u003cbr /\u003e |"]]
