Added in API level 11

TypeEvaluator

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Kotlin |Java

interface TypeEvaluator<T : Any!>

android.animation.TypeEvaluator

Known Direct Subclasses ArgbEvaluator, FloatArrayEvaluator, FloatEvaluator, IntArrayEvaluator, IntEvaluator, PointFEvaluator, RectEvaluator ArgbEvaluator This evaluator can be used to perform type interpolation between integer values that represent ARGB colors. FloatArrayEvaluator This evaluator can be used to perform type interpolation between float[] values. FloatEvaluator This evaluator can be used to perform type interpolation between float values. IntArrayEvaluator This evaluator can be used to perform type interpolation between int[] values. IntEvaluator This evaluator can be used to perform type interpolation between int values. PointFEvaluator This evaluator can be used to perform type interpolation between PointF values. RectEvaluator This evaluator can be used to perform type interpolation between Rect values.

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, startValue: T, 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

Added in API level 11

abstract fun evaluate(
    fraction: Float, 
    startValue: T, 
    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.