Added in API level 18
FocusObserver
abstract class FocusObserver
| kotlin.Any | |
| ↳ | 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 | |
|---|---|
|
Construct a new observer. |
|
| Public methods | |
|---|---|
| abstract Unit |
onFocusGained(token: WindowId!)Called when one of the monitored windows gains input focus. |
| abstract Unit |
onFocusLost(token: WindowId!)Called when one of the monitored windows loses input focus. |
Public constructors
FocusObserver
Added in API level 18
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
abstract fun onFocusGained(token: WindowId!): Unit
Called when one of the monitored windows gains input focus.
onFocusLost
Added in API level 18
abstract fun onFocusLost(token: WindowId!): Unit
Called when one of the monitored windows loses input focus.