TypeEvaluator

interface TypeEvaluator<T : Any!>
androidx.core.animation.TypeEvaluator

Interface for use with the ValueAnimator#setEvaluator(TypeEvaluator) function. Evaluators allow developers to create animations on arbitrary property types, by allowing them to supply custom evaluators for types that are not automatically understood and used by the animation system.

Summary

Public methods
abstract T
evaluate(fraction: Float, @NonNull startValue: T, @NonNull endValue: T)

This function returns the result of linearly interpolating the start and end values, with fraction representing the proportion between the start and end values.

Public methods

evaluate

@NonNull abstract fun evaluate(
    fraction: Float,
    @NonNull startValue: T,
    @NonNull endValue: T
): T

This function returns the result of linearly interpolating the start and end values, with fraction representing the proportion between the start and end values. The calculation is a simple parametric calculation: result = x0 + t * (x1 - x0), where x0 is startValue, x1 is endValue, and t is fraction.

Parameters
fraction Float: The fraction from the starting to the ending values
startValue T: The start value.
endValue T: The end value.
Return
T A linear interpolation between the start and end values, given the fraction parameter.