ViewTreeObserver ViewTreeObserver Class

Definition

A view tree observer is used to register listeners that can be notified of global changes in the view tree.

[Android.Runtime.Register("android/view/ViewTreeObserver", ApiSince=1, DoNotGenerateAcw=true)]
public sealed class ViewTreeObserver : Java.Lang.Object
type ViewTreeObserver = class
    inherit Object
Inheritance
ViewTreeObserverViewTreeObserver
Derived
Attributes

Remarks

Android platform documentation

Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.

Properties

Class Class

Returns the unique instance of Class that represents this object's class.

(Inherited from Object)
Handle Handle

The handle to the underlying Android instance.

(Inherited from Object)
IJavaObjectEx.IsProxy IJavaObjectEx.IsProxy Inherited from Object
IJavaObjectEx.KeyHandle IJavaObjectEx.KeyHandle Inherited from Object
IJavaObjectEx.NeedsActivation IJavaObjectEx.NeedsActivation Inherited from Object
IJavaPeerable.JniManagedPeerState IJavaPeerable.JniManagedPeerState Inherited from Object
IsAlive IsAlive

Indicates whether this ViewTreeObserver is alive.

JniIdentityHashCode JniIdentityHashCode Inherited from Object
JniPeerMembers JniPeerMembers
PeerReference PeerReference Inherited from Object
ThresholdClass ThresholdClass

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.

(Inherited from Object)
ThresholdType ThresholdType

This API supports the Mono for Android infrastructure and is not intended to be used directly from your code.

(Inherited from Object)

Methods

AddOnDrawListener(ViewTreeObserver+IOnDrawListener) AddOnDrawListener(ViewTreeObserver+IOnDrawListener)
AddOnGlobalFocusChangeListener(ViewTreeObserver+IOnGlobalFocusChangeListener) AddOnGlobalFocusChangeListener(ViewTreeObserver+IOnGlobalFocusChangeListener)

Register a callback to be invoked when the focus state within the view tree changes.

AddOnGlobalLayoutListener(ViewTreeObserver+IOnGlobalLayoutListener) AddOnGlobalLayoutListener(ViewTreeObserver+IOnGlobalLayoutListener)

Register a callback to be invoked when the global layout state or the visibility of views within the view tree changes

AddOnPreDrawListener(ViewTreeObserver+IOnPreDrawListener) AddOnPreDrawListener(ViewTreeObserver+IOnPreDrawListener)

Register a callback to be invoked when the view tree is about to be drawn

AddOnScrollChangedListener(ViewTreeObserver+IOnScrollChangedListener) AddOnScrollChangedListener(ViewTreeObserver+IOnScrollChangedListener)

Register a callback to be invoked when a view has been scrolled.

AddOnTouchModeChangeListener(ViewTreeObserver+IOnTouchModeChangeListener) AddOnTouchModeChangeListener(ViewTreeObserver+IOnTouchModeChangeListener)

Register a callback to be invoked when the invoked when the touch mode changes.

AddOnWindowAttachListener(ViewTreeObserver+IOnWindowAttachListener) AddOnWindowAttachListener(ViewTreeObserver+IOnWindowAttachListener)

Register a callback to be invoked when the view hierarchy is attached to a window.

AddOnWindowFocusChangeListener(ViewTreeObserver+IOnWindowFocusChangeListener) AddOnWindowFocusChangeListener(ViewTreeObserver+IOnWindowFocusChangeListener)

Register a callback to be invoked when the window focus state within the view tree changes.

Clone() Clone()

Creates and returns a copy of this Object.

(Inherited from Object)
DispatchOnDraw() DispatchOnDraw()

Notifies registered listeners that the drawing pass is about to start.

DispatchOnGlobalLayout() DispatchOnGlobalLayout()

Notifies registered listeners that a global layout happened.

DispatchOnPreDraw() DispatchOnPreDraw()

Notifies registered listeners that the drawing pass is about to start.

Dispose() Dispose() Inherited from Object
Dispose(Boolean) Dispose(Boolean) Inherited from Object
Equals(Object) Equals(Object)

Compares this instance with the specified object and indicates if they are equal.

(Inherited from Object)
GetHashCode() GetHashCode()

Returns an integer hash code for this object.

(Inherited from Object)
JavaFinalize() JavaFinalize()

Invoked when the garbage collector has detected that this instance is no longer reachable.

(Inherited from Object)
Notify() Notify()

Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.

(Inherited from Object)
NotifyAll() NotifyAll()

Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.

(Inherited from Object)
RemoveGlobalOnLayoutListener(ViewTreeObserver+IOnGlobalLayoutListener) RemoveGlobalOnLayoutListener(ViewTreeObserver+IOnGlobalLayoutListener)

Remove a previously installed global layout callback

RemoveOnDrawListener(ViewTreeObserver+IOnDrawListener) RemoveOnDrawListener(ViewTreeObserver+IOnDrawListener)
RemoveOnGlobalFocusChangeListener(ViewTreeObserver+IOnGlobalFocusChangeListener) RemoveOnGlobalFocusChangeListener(ViewTreeObserver+IOnGlobalFocusChangeListener)

Remove a previously installed focus change callback.

RemoveOnGlobalLayoutListener(ViewTreeObserver+IOnGlobalLayoutListener) RemoveOnGlobalLayoutListener(ViewTreeObserver+IOnGlobalLayoutListener)

Remove a previously installed global layout callback

RemoveOnPreDrawListener(ViewTreeObserver+IOnPreDrawListener) RemoveOnPreDrawListener(ViewTreeObserver+IOnPreDrawListener)

Remove a previously installed pre-draw callback

RemoveOnScrollChangedListener(ViewTreeObserver+IOnScrollChangedListener) RemoveOnScrollChangedListener(ViewTreeObserver+IOnScrollChangedListener)

Remove a previously installed scroll-changed callback

RemoveOnTouchModeChangeListener(ViewTreeObserver+IOnTouchModeChangeListener) RemoveOnTouchModeChangeListener(ViewTreeObserver+IOnTouchModeChangeListener)

Remove a previously installed touch mode change callback

RemoveOnWindowAttachListener(ViewTreeObserver+IOnWindowAttachListener) RemoveOnWindowAttachListener(ViewTreeObserver+IOnWindowAttachListener)

Remove a previously installed window attach callback.

RemoveOnWindowFocusChangeListener(ViewTreeObserver+IOnWindowFocusChangeListener) RemoveOnWindowFocusChangeListener(ViewTreeObserver+IOnWindowFocusChangeListener)

Remove a previously installed window focus change callback.

SetHandle(IntPtr, JniHandleOwnership) SetHandle(IntPtr, JniHandleOwnership)

Sets the Handle property.

(Inherited from Object)
ToArray<T>() ToArray<T>() Inherited from Object
ToString() ToString()

Returns a string containing a concise, human-readable description of this object.

(Inherited from Object)
UnregisterFromRuntime() UnregisterFromRuntime() Inherited from Object
Wait() Wait()

Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

(Inherited from Object)
Wait(Int64) Wait(Int64)

Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.

(Inherited from Object)
Wait(Int64, Int32) Wait(Int64, Int32)

Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.

(Inherited from Object)

Events

Draw Draw
GlobalFocusChange GlobalFocusChange
GlobalLayout GlobalLayout
PreDraw PreDraw
ScrollChanged ScrollChanged
TouchModeChange TouchModeChange
WindowAttached WindowAttached
WindowDetached WindowDetached
WindowFocusChange WindowFocusChange

Explicit Interface Implementations

IJavaObjectEx.ToLocalJniHandle() IJavaObjectEx.ToLocalJniHandle() Inherited from Object
IJavaPeerable.Disposed() IJavaPeerable.Disposed() Inherited from Object
IJavaPeerable.DisposeUnlessReferenced() IJavaPeerable.DisposeUnlessReferenced() Inherited from Object
IJavaPeerable.Finalized() IJavaPeerable.Finalized() Inherited from Object
IJavaPeerable.SetJniIdentityHashCode(Int32) IJavaPeerable.SetJniIdentityHashCode(Int32) Inherited from Object
IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) Inherited from Object
IJavaPeerable.SetPeerReference(JniObjectReference) IJavaPeerable.SetPeerReference(JniObjectReference) Inherited from Object

Extension Methods

JavaCast<TResult>(IJavaObject) JavaCast<TResult>(IJavaObject)

Performs an Android runtime-checked type conversion.

JavaCast<TResult>(IJavaObject) JavaCast<TResult>(IJavaObject)
GetJniTypeName(IJavaPeerable) GetJniTypeName(IJavaPeerable)

Applies to