Handler Class
Definition
Important
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A Handler allows you to send and process Message and Runnable
objects associated with a thread's MessageQueue.
[Android.Runtime.Register("android/os/Handler", DoNotGenerateAcw=true)]
public class Handler : Java.Lang.Object[<Android.Runtime.Register("android/os/Handler", DoNotGenerateAcw=true)>]
type Handler = class
inherit Object- Inheritance
- Derived
- Attributes
Remarks
Java documentation for android.os.Handler.
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.
Constructors
| Handler() |
Obsolete.
Default constructor associates this handler with the |
| Handler(Action<Message>) | |
| Handler(Handler+ICallback) |
Obsolete.
Constructor associates this handler with the Looper for the current thread and takes a callback interface in which you can handle messages. |
| Handler(IntPtr, JniHandleOwnership) |
A constructor used when creating managed representations of JNI objects; called by the runtime. |
| Handler(Looper) |
Use the provided |
| Handler(Looper, Handler+ICallback) |
Use the provided Looper instead of the default one and take a callback interface in which to handle messages. |
Properties
| Class |
Returns the runtime class of this |
| Handle |
The handle to the underlying Android instance. (Inherited from Object) |
| JniIdentityHashCode | (Inherited from Object) |
| JniPeerMembers | |
| Looper | |
| PeerReference | (Inherited from Object) |
| ThresholdClass |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. |
| ThresholdType |
This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. |
Methods
| Clone() |
Creates and returns a copy of this object. (Inherited from Object) |
| CreateAsync(Looper) |
Create a new Handler whose posted messages and runnables are not subject to synchronization barriers such as display vsync. |
| CreateAsync(Looper, Handler+ICallback) |
Create a new Handler whose posted messages and runnables are not subject to synchronization barriers such as display vsync. |
| DispatchMessage(Message) |
Handle system messages here. |
| Dispose() | (Inherited from Object) |
| Dispose(Boolean) | (Inherited from Object) |
| Dump(IPrinter, String) | |
| DumpAsync(IPrinter, String) | |
| Equals(Object) |
Indicates whether some other object is "equal to" this one. (Inherited from Object) |
| GetHashCode() |
Returns a hash code value for the object. (Inherited from Object) |
| GetMessageName(Message) |
Returns a string representing the name of the specified message. |
| HandleMessage(Message) |
Subclasses must implement this to receive messages. |
| HasCallbacks(IRunnable) |
Check if there are any pending posts of messages with callback r in the message queue. |
| HasMessages(Int32) |
Check if there are any pending posts of messages with code 'what' in the message queue. |
| HasMessages(Int32, Object) |
Check if there are any pending posts of messages with code 'what' and whose obj is 'object' in the message queue. |
| JavaFinalize() |
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (Inherited from Object) |
| Notify() |
Wakes up a single thread that is waiting on this object's monitor. (Inherited from Object) |
| NotifyAll() |
Wakes up all threads that are waiting on this object's monitor. (Inherited from Object) |
| ObtainMessage() |
Returns a new |
| ObtainMessage(Int32) |
Same as |
| ObtainMessage(Int32, Int32, Int32) |
Same as |
| ObtainMessage(Int32, Int32, Int32, Object) |
Same as |
| ObtainMessage(Int32, Object) |
Same as |
| Post(Action) | |
| Post(IRunnable) |
Causes the Runnable r to be added to the message queue. |
| PostAtFrontOfQueue(Action) | |
| PostAtFrontOfQueue(IRunnable) |
Posts a message to an object that implements Runnable. |
| PostAtTime(Action, Int64) | |
| PostAtTime(Action, Object, Int64) | |
| PostAtTime(IRunnable, Int64) |
Causes the Runnable r to be added to the message queue, to be run at a specific time given by <var>uptimeMillis</var>. |
| PostAtTime(IRunnable, Object, Int64) |
Causes the Runnable r to be added to the message queue, to be run at a specific time given by <var>uptimeMillis</var>. |
| PostDelayed(Action, Int64) | |
| PostDelayed(IRunnable, Int64) |
Causes the Runnable r to be added to the message queue, to be run after the specified amount of time elapses. |
| PostDelayed(IRunnable, Object, Int64) |
Causes the Runnable r to be added to the message queue, to be run after the specified amount of time elapses. |
| RemoveCallbacks(Action) | |
| RemoveCallbacks(Action, Object) | |
| RemoveCallbacks(IRunnable) |
Remove any pending posts of Runnable r that are in the message queue. |
| RemoveCallbacks(IRunnable, Object) |
Remove any pending posts of Runnable <var>r</var> with Object <var>token</var> that are in the message queue. |
| RemoveCallbacksAndMessages(Object) |
Remove any pending posts of callbacks and sent messages whose <var>obj</var> is <var>token</var>. |
| RemoveMessages(Int32) |
Remove any pending posts of messages with code 'what' that are in the message queue. |
| RemoveMessages(Int32, Object) |
Remove any pending posts of messages with code 'what' and whose obj is 'object' that are in the message queue. |
| SendEmptyMessage(Int32) |
Sends a Message containing only the what value. |
| SendEmptyMessageAtTime(Int32, Int64) |
Sends a Message containing only the what value, to be delivered at a specific time. |
| SendEmptyMessageDelayed(Int32, Int64) |
Sends a Message containing only the what value, to be delivered after the specified amount of time elapses. |
| SendMessage(Message) |
Pushes a message onto the end of the message queue after all pending messages before the current time. |
| SendMessageAtFrontOfQueue(Message) |
Enqueue a message at the front of the message queue, to be processed on the next iteration of the message loop. |
| SendMessageAtTime(Message, Int64) |
Enqueue a message into the message queue after all pending messages before the absolute time (in milliseconds) <var>uptimeMillis</var>. |
| SendMessageDelayed(Message, Int64) |
Enqueue a message into the message queue after all pending messages before (current time + delayMillis). |
| SetHandle(IntPtr, JniHandleOwnership) |
Sets the Handle property. (Inherited from Object) |
| ToArray<T>() | (Inherited from Object) |
| ToString() |
Returns a string representation of the object. (Inherited from Object) |
| UnregisterFromRuntime() | (Inherited from Object) |
| Wait() |
Causes the current thread to wait until another thread invokes the
|
| Wait(Int64) |
Causes the current thread to wait until either another thread invokes the
|
| Wait(Int64, Int32) |
Causes the current thread to wait until another thread invokes the
|
Explicit Interface Implementations
| IJavaPeerable.Disposed() | (Inherited from Object) |
| IJavaPeerable.DisposeUnlessReferenced() | (Inherited from Object) |
| IJavaPeerable.Finalized() | (Inherited from Object) |
| IJavaPeerable.JniManagedPeerState | (Inherited from Object) |
| IJavaPeerable.SetJniIdentityHashCode(Int32) | (Inherited from Object) |
| IJavaPeerable.SetJniManagedPeerState(JniManagedPeerStates) | (Inherited from Object) |
| IJavaPeerable.SetPeerReference(JniObjectReference) | (Inherited from Object) |
Extension Methods
| JavaCast<TResult>(IJavaObject) |
Performs an Android runtime-checked type conversion. |
| JavaCast<TResult>(IJavaObject) | |
| GetJniTypeName(IJavaPeerable) | |