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Added in API level 1

public class

AlphaAnimation

extends Animation

java.lang.Object
↳	android.view.animation.Animation
	↳	android.view.animation.AlphaAnimation

Class Overview

An animation that controls the alpha level of an object. Useful for fading things in and out. This animation ends up changing the alpha property of a Transformation

Summary

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Inherited XML Attributes

From class android.view.animation.Animation

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Inherited Constants

From class android.view.animation.Animation

int	ABSOLUTE	The specified dimension is an absolute number of pixels.
int	INFINITE	Repeat the animation indefinitely.
int	RELATIVE_TO_PARENT	The specified dimension holds a float and should be multiplied by the height or width of the parent of the object being animated.
int	RELATIVE_TO_SELF	The specified dimension holds a float and should be multiplied by the height or width of the object being animated.
int	RESTART	When the animation reaches the end and the repeat count is INFINTE_REPEAT or a positive value, the animation restarts from the beginning.
int	REVERSE	When the animation reaches the end and the repeat count is INFINTE_REPEAT or a positive value, the animation plays backward (and then forward again).
int	START_ON_FIRST_FRAME	Can be used as the start time to indicate the start time should be the current time when `getTransformation(long, Transformation)` is invoked for the first animation frame.
int	ZORDER_BOTTOM	Requests that the content being animated be forced under all other content for the duration of the animation.
int	ZORDER_NORMAL	Requests that the content being animated be kept in its current Z order.
int	ZORDER_TOP	Requests that the content being animated be forced on top of all other content for the duration of the animation.

Public Constructors
? Examples	AlphaAnimation( Context context, AttributeSet attrs) Constructor used when an AlphaAnimation is loaded from a resource.
? Examples	AlphaAnimation(float fromAlpha, float toAlpha) Constructor to use when building an AlphaAnimation from code

Public Methods
? Examples	boolean	willChangeBounds() Indicates whether or not this animation will affect the bounds of the animated view.
? Examples	boolean	willChangeTransformationMatrix() Indicates whether or not this animation will affect the transformation matrix.

Protected Methods
void	applyTransformation(float interpolatedTime, Transformation t) Changes the alpha property of the supplied `Transformation`

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Inherited Methods

From class android.view.animation.Animation

void	applyTransformation(float interpolatedTime, Transformation t) Helper for getTransformation.
void	cancel() Cancel the animation.
Animation	clone() Creates and returns a copy of this `Object`.
long	computeDurationHint() Compute a hint at how long the entire animation may last, in milliseconds.
void	ensureInterpolator() Gurantees that this animation has an interpolator.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
int	getBackgroundColor() Returns the background color behind the animation.
boolean	getDetachWallpaper() Return value of `setDetachWallpaper(boolean)`.
long	getDuration() How long this animation should last
boolean	getFillAfter() If fillAfter is true, this animation will apply its transformation after the end time of the animation.
boolean	getFillBefore() If fillBefore is true, this animation will apply its transformation before the start time of the animation.
Interpolator	getInterpolator() Gets the acceleration curve type for this animation.
int	getRepeatCount() Defines how many times the animation should repeat.
int	getRepeatMode() Defines what this animation should do when it reaches the end.
float	getScaleFactor() The scale factor is set by the call to `getTransformation`.
long	getStartOffset() When this animation should start, relative to StartTime
long	getStartTime() When this animation should start.
boolean	getTransformation(long currentTime, Transformation outTransformation, float scale) Gets the transformation to apply at a specified point in time.
boolean	getTransformation(long currentTime, Transformation outTransformation) Gets the transformation to apply at a specified point in time.
int	getZAdjustment() Returns the Z ordering mode to use while running the animation as previously set by `setZAdjustment(int)`.
boolean	hasEnded() Indicates whether this animation has ended or not.
boolean	hasStarted() Indicates whether this animation has started or not.
void	initialize(int width, int height, int parentWidth, int parentHeight) Initialize this animation with the dimensions of the object being animated as well as the objects parents.
boolean	isFillEnabled() If fillEnabled is true, this animation will apply the value of fillBefore.
boolean	isInitialized() Whether or not the animation has been initialized.
void	reset() Reset the initialization state of this animation.
float	resolveSize(int type, float value, int size, int parentSize) Convert the information in the description of a size to an actual dimension
void	restrictDuration(long durationMillis) Ensure that the duration that this animation will run is not longer than `durationMillis`.
void	scaleCurrentDuration(float scale) How much to scale the duration by.
void	setAnimationListener( Animation.AnimationListener listener) Binds an animation listener to this animation.
void	setBackgroundColor(int bg) Set background behind animation.
void	setDetachWallpaper(boolean detachWallpaper) If detachWallpaper is true, and this is a window animation of a window that has a wallpaper background, then the window will be detached from the wallpaper while it runs.
void	setDuration(long durationMillis) How long this animation should last.
void	setFillAfter(boolean fillAfter) If fillAfter is true, the transformation that this animation performed will persist when it is finished.
void	setFillBefore(boolean fillBefore) If fillBefore is true, this animation will apply its transformation before the start time of the animation.
void	setFillEnabled(boolean fillEnabled) If fillEnabled is true, the animation will apply the value of fillBefore.
void	setInterpolator( Context context, int resID) Sets the acceleration curve for this animation.
void	setInterpolator( Interpolator i) Sets the acceleration curve for this animation.
void	setRepeatCount(int repeatCount) Sets how many times the animation should be repeated.
void	setRepeatMode(int repeatMode) Defines what this animation should do when it reaches the end.
void	setStartOffset(long startOffset) When this animation should start relative to the start time.
void	setStartTime(long startTimeMillis) When this animation should start.
void	setZAdjustment(int zAdjustment) Set the Z ordering mode to use while running the animation.
void	start() Convenience method to start the animation the first time `getTransformation(long, Transformation)` is invoked.
void	startNow() Convenience method to start the animation at the current time in milliseconds.
boolean	willChangeBounds() Indicates whether or not this animation will affect the bounds of the animated view.
boolean	willChangeTransformationMatrix() Indicates whether or not this animation will affect the transformation matrix.

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals( Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	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.
final void	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.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Public Constructors

public AlphaAnimation (Context context, AttributeSet attrs)

Added in API level 1

Constructor used when an AlphaAnimation is loaded from a resource.

Parameters

context	Application context to use
attrs	Attribute set from which to read values

public AlphaAnimation (float fromAlpha, float toAlpha)

Added in API level 1

Constructor to use when building an AlphaAnimation from code

Parameters

fromAlpha	Starting alpha value for the animation, where 1.0 means fully opaque and 0.0 means fully transparent.
toAlpha	Ending alpha value for the animation.

Public Methods

public boolean willChangeBounds ()

Added in API level 1

Indicates whether or not this animation will affect the bounds of the animated view. For instance, a fade animation will not affect the bounds whereas a 200% scale animation will.

Returns

true if this animation will change the view's bounds

public boolean willChangeTransformationMatrix ()

Added in API level 1

Indicates whether or not this animation will affect the transformation matrix. For instance, a fade animation will not affect the matrix whereas a scale animation will.

Returns

true if this animation will change the transformation matrix

Protected Methods

protected void applyTransformation (float interpolatedTime, Transformation t)

Added in API level 1

Changes the alpha property of the supplied Transformation

Parameters

interpolatedTime	The value of the normalized time (0.0 to 1.0) after it has been run through the interpolation function.
t	The Transformation object to fill in with the current transforms.

information

No examples for this method.

Frequently called with: [Clear]

This example was provided by APIMiner.

Portions of this page are reproduced from work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License. The original page is available here.

Results

Interfaces

Classes

AlphaAnimation

Class Overview

Summary

Public Constructors

public AlphaAnimation (Context context, AttributeSet attrs)

Parameters

public AlphaAnimation (float fromAlpha, float toAlpha)

Parameters

Public Methods

public boolean willChangeBounds ()

Returns

public boolean willChangeTransformationMatrix ()

Returns

Protected Methods

protected void applyTransformation (float interpolatedTime, Transformation t)

Parameters