![]() ![]() 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. 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. 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
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