WindowId.FocusObserver

Kotlin |Java

public static abstract class WindowId.FocusObserver
extends Object

java.lang.Object
↳	android.view.WindowId.FocusObserver

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 constructors
`FocusObserver()` Construct a new observer.

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

Added in API level 18

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

Added in API level 18

public abstract void onFocusGained (WindowId token)

Called when one of the monitored windows gains input focus.

Parameters
`token`	`WindowId`

onFocusLost

Added in API level 18

public abstract void onFocusLost (WindowId token)

Called when one of the monitored windows loses input focus.

Parameters
`token`	`WindowId`