VelocityTracker Class

Reference

Definition

Namespace:: Android.Views

Assembly:: Mono.Android.dll

Important

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Helper for tracking the velocity of motion events, for implementing flinging and other such gestures.

[Android.Runtime.Register("android/view/VelocityTracker", DoNotGenerateAcw=true)]
public sealed class VelocityTracker : Java.Lang.Object

[<Android.Runtime.Register("android/view/VelocityTracker", DoNotGenerateAcw=true)>]
type VelocityTracker = class
    inherit Object

Inheritance: Object

Object
VelocityTracker

Attributes: RegisterAttribute

Remarks

Helper for tracking the velocity of motion events, for implementing flinging and other such gestures.

Use #obtain to retrieve a new instance of the class when you are going to begin tracking. Put the motion events you receive into it with #addMovement(MotionEvent). When you want to determine the velocity, call #computeCurrentVelocity(int) and then call the velocity-getter methods like #getXVelocity(int), #getYVelocity(int), or #getAxisVelocity(int, int) to retrieve velocity for different axes and/or pointer IDs.

Java documentation for android.view.VelocityTracker.

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	Returns the runtime class of this `Object`. (Inherited from Object)
Handle	The handle to the underlying Android instance. (Inherited from Object)
JniIdentityHashCode	(Inherited from Object)
JniPeerMembers
PeerReference	(Inherited from Object)
ThresholdClass	This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. (Inherited from Object)
ThresholdType	This API supports the Mono for Android infrastructure and is not intended to be used directly from your code. (Inherited from Object)
XVelocity	Retrieve the last computed X velocity.
YVelocity	Retrieve the last computed Y velocity.

Methods

AddMovement(MotionEvent)	Add a user's movement to the tracker.
Clear()	Reset the velocity tracker back to its initial state.
Clone()	Creates and returns a copy of this object. (Inherited from Object)
ComputeCurrentVelocity(Int32, Single)	Compute the current velocity based on the points that have been collected.
ComputeCurrentVelocity(Int32)	Equivalent to invoking `#computeCurrentVelocity(int, float)` with a maximum velocity of Float.
Dispose()	(Inherited from Object)
Dispose(Boolean)	(Inherited from Object)
Equals(Object)	Indicates whether some other object is "equal to" this one. (Inherited from Object)
GetAxisVelocity(Axis, Int32)	Retrieve the last computed velocity for a given motion axis.
GetAxisVelocity(Axis)	Equivalent to calling `#getAxisVelocity(int, int)` for `axis` and the active pointer.
GetHashCode()	Returns a hash code value for the object. (Inherited from Object)
GetXVelocity(Int32)	Retrieve the last computed X velocity.
GetYVelocity(Int32)	Retrieve the last computed Y velocity.
IsAxisSupported(Axis)	Checks whether a given velocity-trackable `MotionEvent` axis is supported for velocity tracking by this `VelocityTracker` instance (refer to `#getAxisVelocity(int, int)` for a list of potentially velocity-trackable axes).
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)
Obtain()	Retrieve a new VelocityTracker object to watch the velocity of a motion.
Recycle()	Return a VelocityTracker object back to be re-used by others.
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 it is awakened, typically by being <em>notified</em> or <em>interrupted</em>. (Inherited from Object)
Wait(Int64, Int32)	Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object)
Wait(Int64)	Causes the current thread to wait until it is awakened, typically by being <em>notified</em> or <em>interrupted</em>, or until a certain amount of real time has elapsed. (Inherited from Object)

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)

Applies to

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