The view animation system is also constrained in the fact that it onlyĮxposes a few aspects of a View object to animate, such as the scaling and Objects, so if you wanted to animate non- View objects, you have to implement The view animation system provides the capability to only animate View How property animation differs from view animation 15 at t =ġ0 ms, so the value for the property at that time would be. For example, in Figure 2, the interpolated fraction was.
Property that you are animating, based on the interpolated fraction, the starting value, and theĮnding value of the animation. The appropriate TypeEvaluator, to calculate the value of the When the interpolated fraction is calculated, ValueAnimator calls
In Figure 1, the interpolated fraction is always the same as For example, in Figure 2,īecause the animation slowly accelerates, the interpolated fraction, about. An interpolated fraction maps the elapsed fraction to a newįraction that takes into account the time interpolation that is set. When the ValueAnimator is done calculating an elapsed fraction, itĬalls the TimeInterpolator that is currently set, to calculate an For example, in Figure 1, the elapsed fraction at t = 10 ms would be. TheĮlapsed fraction represents the percentage of time that the animation has completed, 0 meaning 0%Īnd 1 meaning 100%. During the whole animation, the ValueAnimator calculates an elapsed fractionīetween 0 and 1, based on the duration of the animation and how much time has elapsed. When you call start() the animationīegins. Starting and ending values for the property that you want to animate, along with the duration of To start an animation, create a ValueAnimator and give it the For example, in Figure 2, the TimeInterpolator used would beĪccelerateDecelerateInterpolator and the TypeEvaluator would be IntEvaluator.
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The ValueAnimator encapsulates a TimeInterpolator, which defines animation interpolation, and a TypeEvaluator, which defines how to calculate values for the property beingĪnimated. Such as how long the animation has been running, and the current value of the property that it is The ValueAnimator object keeps track of your animation's timing, Would calculate animations like the ones illustrated above. Let's take a detailed look at how the important components of the property animation system As Figure 2 shows, the distance traveledĪt the beginning and end of the animation is less than in the middle.įigure 2. Halfway point until the end of the animation. In theīeginning, this animation accelerates up to the halfway point then decelerates from the The object still moves 40 pixels in 40 ms, but non-linearly. Hypothetical object that accelerates at the beginning of the animation, and decelerates at theĮnd of the animation. You can also specify animations to have a non-linear interpolation. This is an example of an animation with linear interpolation, meaning the At the end of 40ms, the animation stops, and the object ends at Every 10 ms, which is the default frame refresh rate, the object moves The duration of the animation is set to 40 ms and the distance Hypothetical object that is animated with its x property, which represents its How property animation worksįirst, let's go over how an animation works with a simple example.
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To see a full example of property animation, see theĬhangeColor class in the CustomTransition Ultimately dependent on how busy the system is overall and how fast the system can service the underlying timer. Theĭefault is set to refresh every 10 ms, but the speed in which your application can refresh frames is Frame refresh delay: You can specify how often to refresh frames of your animation.Animator sets: You can group animations into logical sets that play together or.The animation forwards then backwards repeatedly, until the number of repeats is reached. Specify whether you want the animation to play back in reverse. It reaches the end of a duration and how many times to repeat the animation. Repeat count and behavior: You can specify whether or not to have an animation repeat when.Time interpolation: You can specify how the values for the property are calculated as aįunction of the animation's current elapsed time.Duration: You can specify the duration of an animation.The property animation system lets you define the following characteristics of an
You want to animate it for, and what values you want to animate between. Object property that you want to animate, such as an object's position on the screen, how long (a field in an object) value over a specified length of time. A property animation changes a property's Regardless of whether it draws to the screen or not. You can define an animation to change any object property over time, The property animation system is a robust framework that allows you