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This has been fixed in Opera Safari Full support 4. WebView Android Full support 2. Edge Mobile Full support Yes. Opera Android Full support Yes. Safari iOS Full support Yes. The ValueAnimator encapsulates a TimeInterpolator , which defines animation interpolation, and a TypeEvaluator , which defines how to calculate values for the property being animated.

To start an animation, create a ValueAnimator and give it the starting and ending values for the property that you want to animate, along with the duration of the animation. When you call start the animation begins. During the whole animation, the ValueAnimator calculates an elapsed fraction between 0 and 1, based on the duration of the animation and how much time has elapsed. When the ValueAnimator is done calculating an elapsed fraction, it calls the TimeInterpolator that is currently set, to calculate an interpolated fraction.

An interpolated fraction maps the elapsed fraction to a new fraction that takes into account the time interpolation that is set. For example, in Figure 2, because the animation slowly accelerates, the interpolated fraction, about. In Figure 1, the interpolated fraction is always the same as the elapsed fraction. When the interpolated fraction is calculated, ValueAnimator calls the appropriate TypeEvaluator , to calculate the value of the property that you are animating, based on the interpolated fraction, the starting value, and the ending value of the animation.

For example, in Figure 2, the interpolated fraction was.

Android Quick Tip

The view animation system provides the capability to only animate View objects, so if you wanted to animate non- View objects, you have to implement your own code to do so. The view animation system is also constrained in the fact that it only exposes a few aspects of a View object to animate, such as the scaling and rotation of a View but not the background color, for instance.

Another disadvantage of the view animation system is that it only modified where the View was drawn, and not the actual View itself. For instance, if you animated a button to move across the screen, the button draws correctly, but the actual location where you can click the button does not change, so you have to implement your own logic to handle this.

With the property animation system, these constraints are completely removed, and you can animate any property of any object Views and non-Views and the object itself is actually modified. The property animation system is also more robust in the way it carries out animation. At a high level, you assign animators to the properties that you want to animate, such as color, position, or size and can define aspects of the animation such as interpolation and synchronization of multiple animators. The view animation system, however, takes less time to setup and requires less code to write.

If view animation accomplishes everything that you need to do, or if your existing code already works the way you want, there is no need to use the property animation system. It also might make sense to use both animation systems for different situations if the use case arises. You can find most of the property animation system's APIs in android. Because the view animation system already defines many interpolators in android.

The following tables describe the main components of the property animation system. The Animator class provides the basic structure for creating animations. You normally do not use this class directly as it only provides minimal functionality that must be extended to fully support animating values.

The following subclasses extend Animator:.

Your Answer

Evaluators tell the property animation system how to calculate values for a given property. They take the timing data that is provided by an Animator class, the animation's start and end value, and calculate the animated values of the property based on this data. The property animation system provides the following evaluators:. A time interpolator defines how specific values in an animation are calculated as a function of time.

For example, you can specify animations to happen linearly across the whole animation, meaning the animation moves evenly the entire time, or you can specify animations to use non-linear time, for example, accelerating at the beginning and decelerating at the end of the animation. Table 3 describes the interpolators that are contained in android. If none of the provided interpolators suits your needs, implement the TimeInterpolator interface and create your own.

See Using interpolators for more information on how to write a custom interpolator. The ValueAnimator class lets you animate values of some type for the duration of an animation by specifying a set of int , float , or color values to animate through.


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You obtain a ValueAnimator by calling one of its factory methods: For example:. In this code, the ValueAnimator starts calculating the values of the animation, between 0 and , for a duration of ms, when the start method runs. In this code, the ValueAnimator starts calculating the values of the animation, between startPropertyValue and endPropertyValue using the logic supplied by MyTypeEvaluator for a duration of ms, when the start method runs. You can use the values of the animation by adding an AnimatorUpdateListener to the ValueAnimator object, as shown in the following code:.

In the onAnimationUpdate method you can access the updated animation value and use it in a property of one of your views. For more information on listeners, see the section about Animation listeners. The ObjectAnimator is a subclass of the ValueAnimator discussed in the previous section and combines the timing engine and value computation of ValueAnimator with the ability to animate a named property of a target object.

This makes animating any object much easier, as you no longer need to implement the ValueAnimator. AnimatorUpdateListener , because the animated property updates automatically. Instantiating an ObjectAnimator is similar to a ValueAnimator , but you also specify the object and the name of that object's property as a String along with the values to animate between:.

To have the ObjectAnimator update properties correctly, you must do the following:. In many cases, you want to play an animation that depends on when another animation starts or finishes. The Android system lets you bundle animations together into an AnimatorSet , so that you can specify whether to start animations simultaneously, sequentially, or after a specified delay. You can also nest AnimatorSet objects within each other. The following code snippet plays the following Animator objects in the following manner:. You can listen for important events during an animation's duration with the listeners described below.

Listen to this event to use the calculated values generated by ValueAnimator during an animation. To use the value, query the ValueAnimator object passed into the event to get the current animated value with the getAnimatedValue method. Implementing this listener is required if you use ValueAnimator. Depending on what property or object you are animating, you might need to call invalidate on a View to force that area of the screen to redraw itself with the new animated values. For example, animating the color property of a Drawable object only cause updates to the screen when that object redraws itself.

All of the property setters on View, such as setAlpha and setTranslationX invalidate the View properly, so you do not need to invalidate the View when calling these methods with new values.

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You can extend the AnimatorListenerAdapter class instead of implementing the Animator. AnimatorListener interface, if you do not want to implement all of the methods of the Animator. AnimatorListener interface. The AnimatorListenerAdapter class provides empty implementations of the methods that you can choose to override. For example, the following code snippet creates an AnimatorListenerAdapter for just the onAnimationEnd callback:.

The property animation system provides the capability to animate changes to ViewGroup objects as well as provide an easy way to animate View objects themselves. You can animate layout changes within a ViewGroup with the LayoutTransition class. The remaining Views in the ViewGroup can also animate into their new positions when you add or remove Views.

You can define the following animations in a LayoutTransition object by calling setAnimator and passing in an Animator object with one of the following LayoutTransition constants:. You can define your own custom animations for these four types of events to customize the look of your layout transitions or just tell the animation system to use the default animations.

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The LayoutAnimations sample in API Demos shows you how to define animations for layout transitions and then set the animations on the View objects that you want to animate. The only thing that you need to do is to set the android: Setting this attribute to true automatically animates Views that are added or removed from the ViewGroup as well as the remaining Views in the ViewGroup. The StateListAnimator class lets you define animators that run when the state of a view changes.

This object behaves as a wrapper for an Animator object, calling that animation whenever the specified view state such as "pressed" or "focused" changes.

For example, the following file creates a state list animator that changes the x and y scale of the view when it's pressed:. To attach the state list animator to a view, add the android: If it is then this is applied vertically. Demo This demo shows examples of background-position set with length units, percentages, and keywords. Declaring Values You can give background-position up to four values in modern browsers see the Browser Support table for details.

Here's an example of a three-value background-position: Here's an example of a four-value background-position: Demo This demo includes examples of one value, two value, three value, and four value background-position. Related background-attachment background-clip background-color background-image background-origin background-repeat background-size More Resources background-position in the CSS3 spec background-position at MDN Offset Background Images Browser Support The basic values are supported everywhere.

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