Added in API level 1

AlphaAnimation

Kotlin |Java

public class AlphaAnimation
extends Animation

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

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

Inherited XML attributes

From class android.view.animation.Animation

`android:backdropColor`	Special option for window animations: whether the window's background should be used as a background to the animation.
`android:detachWallpaper`	Special option for window animations: if this window is on top of a wallpaper, don't animate the wallpaper with it.
`android:duration`	Amount of time (in milliseconds) for the animation to run.
`android:fillAfter`	When set to true, the animation transformation is applied after the animation is over.
`android:fillBefore`	When set to true or when fillEnabled is not set to true, the animation transformation is applied before the animation has started.
`android:fillEnabled`	When set to true, the value of fillBefore is taken into account.
`android:interpolator`	Defines the interpolator used to smooth the animation movement in time.
`android:repeatCount`	Defines how many times the animation should repeat.
`android:repeatMode`	Defines the animation behavior when it reaches the end and the repeat count is greater than 0 or infinite.
`android:showBackdrop`	Special option for window animations: whether to show a background behind the animating windows.
`android:startOffset`	Delay in milliseconds before the animation runs, once start time is reached.
`android:zAdjustment`	Allows for an adjustment of the Z ordering of the content being animated for the duration of the animation.

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, android.view.animation.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
`AlphaAnimation(Context context, AttributeSet attrs)` Constructor used when an AlphaAnimation is loaded from a resource.
`AlphaAnimation(float fromAlpha, float toAlpha)` Constructor to use when building an AlphaAnimation from code

Public methods
`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.

Public methods


      willChangeBounds()

Indicates whether or not this animation will affect the bounds of the animated view.


      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`

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()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`int`	`getBackdropColor()` Returns the background color to show behind the animating windows.
`int`	`getBackgroundColor()` This method was deprecated in API level 30. None of window animations are running with background color.
`boolean`	`getDetachWallpaper()` This method was deprecated in API level 29. All window animations are running with detached wallpaper.
`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`.
`boolean`	`getShowBackdrop()` If showBackdrop is `true` and this animation is applied on a window, then the windows in the animation will animate with the background associated with this window behind them.
`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`	`setBackdropColor(int backdropColor)` Set the color to use for the backdrop shown behind the animating windows.
`void`	`setBackgroundColor(int bg)` This method was deprecated in API level 30. None of window animations are running with background color.
`void`	`setDetachWallpaper(boolean detachWallpaper)` This method was deprecated in API level 29. All window animations are running with detached wallpaper.
`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(Interpolator i)` Sets the acceleration curve for this animation.
`void`	`setInterpolator(Context context, int resID)` 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`	`setShowBackdrop(boolean showBackdrop)` If showBackdrop is `true` and this animation is applied on a window, then the windows in the animation will animate with the background associated with this window behind them.
`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, android.view.animation.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 obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public constructors

AlphaAnimation

Added in API level 1

public AlphaAnimation (Context context, 
                AttributeSet attrs)

Constructor used when an AlphaAnimation is loaded from a resource.

Parameters
`context`	`Context`: Application context to use
`attrs`	`AttributeSet`: Attribute set from which to read values

AlphaAnimation

Added in API level 1

public AlphaAnimation (float fromAlpha, 
                float toAlpha)

Constructor to use when building an AlphaAnimation from code

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

Public methods

willChangeBounds

Added in API level 1

public boolean willChangeBounds ()

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
`boolean`	true if this animation will change the view's bounds

willChangeTransformationMatrix

Added in API level 1

public boolean willChangeTransformationMatrix ()

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
`boolean`	true if this animation will change the transformation matrix

Protected methods

applyTransformation

Added in API level 1

protected void applyTransformation (float interpolatedTime, 
                Transformation t)

Changes the alpha property of the supplied Transformation

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