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Android APIs
public class

ViewPropertyAnimator

extends Object
java.lang.Object
   ↳ android.view.ViewPropertyAnimator

Class Overview

This class enables automatic and optimized animation of select properties on View objects. If only one or two properties on a View object are being animated, then using an ObjectAnimator is fine; the property setters called by ObjectAnimator are well equipped to do the right thing to set the property and invalidate the view appropriately. But if several properties are animated simultaneously, or if you just want a more convenient syntax to animate a specific property, then ViewPropertyAnimator might be more well-suited to the task.

This class may provide better performance for several simultaneous animations, because it will optimize invalidate calls to take place only once for several properties instead of each animated property independently causing its own invalidation. Also, the syntax of using this class could be easier to use because the caller need only tell the View object which property to animate, and the value to animate either to or by, and this class handles the details of configuring the underlying Animator class and starting it.

This class is not constructed by the caller, but rather by the View whose properties it will animate. Calls to animate() will return a reference to the appropriate ViewPropertyAnimator object for that View.

Summary

Public Methods
ViewPropertyAnimator alpha (float value)
This method will cause the View's alpha property to be animated to the specified value.
ViewPropertyAnimator alphaBy (float value)
This method will cause the View's alpha property to be animated by the specified value.
void cancel ()
Cancels all property animations that are currently running or pending.
long getDuration ()
Returns the current duration of property animations.
TimeInterpolator getInterpolator ()
Returns the timing interpolator that this animation uses.
long getStartDelay ()
Returns the current startDelay of property animations.
ViewPropertyAnimator rotation (float value)
This method will cause the View's rotation property to be animated to the specified value.
ViewPropertyAnimator rotationBy (float value)
This method will cause the View's rotation property to be animated by the specified value.
ViewPropertyAnimator rotationX (float value)
This method will cause the View's rotationX property to be animated to the specified value.
ViewPropertyAnimator rotationXBy (float value)
This method will cause the View's rotationX property to be animated by the specified value.
ViewPropertyAnimator rotationY (float value)
This method will cause the View's rotationY property to be animated to the specified value.
ViewPropertyAnimator rotationYBy (float value)
This method will cause the View's rotationY property to be animated by the specified value.
ViewPropertyAnimator scaleX (float value)
This method will cause the View's scaleX property to be animated to the specified value.
ViewPropertyAnimator scaleXBy (float value)
This method will cause the View's scaleX property to be animated by the specified value.
ViewPropertyAnimator scaleY (float value)
This method will cause the View's scaleY property to be animated to the specified value.
ViewPropertyAnimator scaleYBy (float value)
This method will cause the View's scaleY property to be animated by the specified value.
ViewPropertyAnimator setDuration (long duration)
Sets the duration for the underlying animator that animates the requested properties.
ViewPropertyAnimator setInterpolator ( TimeInterpolator interpolator)
Sets the interpolator for the underlying animator that animates the requested properties.
ViewPropertyAnimator setListener ( Animator.AnimatorListener listener)
Sets a listener for events in the underlying Animators that run the property animations.
ViewPropertyAnimator setStartDelay (long startDelay)
Sets the startDelay for the underlying animator that animates the requested properties.
ViewPropertyAnimator setUpdateListener ( ValueAnimator.AnimatorUpdateListener listener)
Sets a listener for update events in the underlying ValueAnimator that runs the property animations.
void start ()
Starts the currently pending property animations immediately.
ViewPropertyAnimator translationX (float value)
This method will cause the View's translationX property to be animated to the specified value.
ViewPropertyAnimator translationXBy (float value)
This method will cause the View's translationX property to be animated by the specified value.
ViewPropertyAnimator translationY (float value)
This method will cause the View's translationY property to be animated to the specified value.
ViewPropertyAnimator translationYBy (float value)
This method will cause the View's translationY property to be animated by the specified value.
ViewPropertyAnimator withEndAction ( Runnable runnable)
Specifies an action to take place when the next animation ends.
ViewPropertyAnimator withLayer ()
The View associated with this ViewPropertyAnimator will have its layer type set to LAYER_TYPE_HARDWARE for the duration of the next animation.
ViewPropertyAnimator withStartAction ( Runnable runnable)
Specifies an action to take place when the next animation runs.
ViewPropertyAnimator x (float value)
This method will cause the View's x property to be animated to the specified value.
ViewPropertyAnimator xBy (float value)
This method will cause the View's x property to be animated by the specified value.
ViewPropertyAnimator y (float value)
This method will cause the View's y property to be animated to the specified value.
ViewPropertyAnimator yBy (float value)
This method will cause the View's y property to be animated by the specified value.
[Expand]
Inherited Methods
From class java.lang.Object

Public Methods

public ViewPropertyAnimator alpha (float value)

This method will cause the View's alpha property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator alphaBy (float value)

This method will cause the View's alpha property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public void cancel ()

Cancels all property animations that are currently running or pending.

public long getDuration ()

Returns the current duration of property animations. If the duration was set on this object, that value is returned. Otherwise, the default value of the underlying Animator is returned.

Returns
  • The duration of animations, in milliseconds.
See Also

public TimeInterpolator getInterpolator ()

Returns the timing interpolator that this animation uses.

Returns
  • The timing interpolator for this animation.

public long getStartDelay ()

Returns the current startDelay of property animations. If the startDelay was set on this object, that value is returned. Otherwise, the default value of the underlying Animator is returned.

Returns
  • The startDelay of animations, in milliseconds.
See Also

public ViewPropertyAnimator rotation (float value)

This method will cause the View's rotation property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator rotationBy (float value)

This method will cause the View's rotation property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator rotationX (float value)

This method will cause the View's rotationX property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator rotationXBy (float value)

This method will cause the View's rotationX property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator rotationY (float value)

This method will cause the View's rotationY property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator rotationYBy (float value)

This method will cause the View's rotationY property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator scaleX (float value)

This method will cause the View's scaleX property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator scaleXBy (float value)

This method will cause the View's scaleX property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator scaleY (float value)

This method will cause the View's scaleY property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator scaleYBy (float value)

This method will cause the View's scaleY property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator setDuration (long duration)

Sets the duration for the underlying animator that animates the requested properties. By default, the animator uses the default value for ValueAnimator. Calling this method will cause the declared value to be used instead.

Parameters
duration The length of ensuing property animations, in milliseconds. The value cannot be negative.
Returns
  • This object, allowing calls to methods in this class to be chained.

public ViewPropertyAnimator setInterpolator ( TimeInterpolator interpolator)

Sets the interpolator for the underlying animator that animates the requested properties. By default, the animator uses the default interpolator for ValueAnimator. Calling this method will cause the declared object to be used instead.

Parameters
interpolator The TimeInterpolator to be used for ensuing property animations.
Returns
  • This object, allowing calls to methods in this class to be chained.

public ViewPropertyAnimator setListener ( Animator.AnimatorListener listener)

Sets a listener for events in the underlying Animators that run the property animations.

Parameters
listener The listener to be called with AnimatorListener events. A value of null removes any existing listener.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator setStartDelay (long startDelay)

Sets the startDelay for the underlying animator that animates the requested properties. By default, the animator uses the default value for ValueAnimator. Calling this method will cause the declared value to be used instead.

Parameters
startDelay The delay of ensuing property animations, in milliseconds. The value cannot be negative.
Returns
  • This object, allowing calls to methods in this class to be chained.

public ViewPropertyAnimator setUpdateListener ( ValueAnimator.AnimatorUpdateListener listener)

Sets a listener for update events in the underlying ValueAnimator that runs the property animations. Note that the underlying animator is animating between 0 and 1 (these values are then turned into the actual property values internally by ViewPropertyAnimator). So the animator cannot give information on the current values of the properties being animated by this ViewPropertyAnimator, although the view object itself can be queried to get the current values.

Parameters
listener The listener to be called with update events. A value of null removes any existing listener.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public void start ()

Starts the currently pending property animations immediately. Calling start() is optional because all animations start automatically at the next opportunity. However, if the animations are needed to start immediately and synchronously (not at the time when the next event is processed by the hierarchy, which is when the animations would begin otherwise), then this method can be used.

public ViewPropertyAnimator translationX (float value)

This method will cause the View's translationX property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator translationXBy (float value)

This method will cause the View's translationX property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator translationY (float value)

This method will cause the View's translationY property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator translationYBy (float value)

This method will cause the View's translationY property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator withEndAction ( Runnable runnable)

Specifies an action to take place when the next animation ends. The action is only run if the animation ends normally; if the ViewPropertyAnimator is canceled during that animation, the runnable will not run. This method, along with withStartAction(Runnable) , is intended to help facilitate choreographing ViewPropertyAnimator animations with other animations or actions in the application.

For example, the following code animates a view to x=200 and then back to 0: 

         Runnable endAction = new Runnable() {
         public void run() {
             view.animate().x(0);
         }
     };
     view.animate().x(200).withEndAction(endAction);
Parameters
runnable The action to run when the next animation ends.
Returns
  • This object, allowing calls to methods in this class to be chained.

public ViewPropertyAnimator withLayer ()

The View associated with this ViewPropertyAnimator will have its layer type set to LAYER_TYPE_HARDWARE for the duration of the next animation. As stated in the documentation for LAYER_TYPE_HARDWARE , the actual type of layer used internally depends on the runtime situation of the view. If the activity and this view are hardware-accelerated, then the layer will be accelerated as well. If the activity or the view is not accelerated, then the layer will effectively be the same as LAYER_TYPE_SOFTWARE .

This state is not persistent, either on the View or on this ViewPropertyAnimator: the layer type of the View will be restored when the animation ends to what it was when this method was called, and this setting on ViewPropertyAnimator is only valid for the next animation. Note that calling this method and then independently setting the layer type of the View (by a direct call to setLayerType(int, android.graphics.Paint) ) will result in some inconsistency, including having the layer type restored to its pre-withLayer() value when the animation ends.

Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator withStartAction ( Runnable runnable)

Specifies an action to take place when the next animation runs. If there is a startDelay set on this ViewPropertyAnimator, then the action will run after that startDelay expires, when the actual animation begins. This method, along with withEndAction(Runnable) , is intended to help facilitate choreographing ViewPropertyAnimator animations with other animations or actions in the application.

Parameters
runnable The action to run when the next animation starts.
Returns
  • This object, allowing calls to methods in this class to be chained.

public ViewPropertyAnimator x (float value)

This method will cause the View's x property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator xBy (float value)

This method will cause the View's x property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator y (float value)

This method will cause the View's y property to be animated to the specified value. Animations already running on the property will be canceled.

Parameters
value The value to be animated to.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also

public ViewPropertyAnimator yBy (float value)

This method will cause the View's y property to be animated by the specified value. Animations already running on the property will be canceled.

Parameters
value The amount to be animated by, as an offset from the current value.
Returns
  • This object, allowing calls to methods in this class to be chained.
See Also