ViewTreeObserver.OnGlobalFocusChangeListener

Enclosing class:: ViewTreeObserver

Functional Interface:: This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface public static interface ViewTreeObserver.OnGlobalFocusChangeListener

Interface definition for a callback to be invoked when the focus state within the view tree changes.

Method Summary

Modifier and Type

Method

Description

void

onGlobalFocusChanged(View oldFocus, View newFocus)

Callback method to be invoked when the focus changes in the view tree.

Method Details
- onGlobalFocusChanged
  
  void onGlobalFocusChanged(@Nullable View oldFocus, @Nullable View newFocus)
  
  Callback method to be invoked when the focus changes in the view tree. When the view tree transitions from touch mode to non-touch mode, oldFocus is null. When the view tree transitions from non-touch mode to touch mode, newFocus is null. When focus changes in non-touch mode (without transition from or to touch mode) either oldFocus or newFocus can be null.
  
  Parameters:
  
  oldFocus - The previously focused view, if any.
  
  newFocus - The newly focused View, if any.