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FloatEvaluator

public final class FloatEvaluator
extends Object implements TypeEvaluator<Float>

java.lang.Object
   ↳ androidx.core.animation.FloatEvaluator


This evaluator can be used to perform type interpolation between float values.

Summary

Public methods

Float evaluate(float fraction, Float startValue, Float endValue)

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

static FloatEvaluator getInstance()

Returns an instance of FloatEvaluator that may be used in ValueAnimator.setEvaluator(TypeEvaluator).

Inherited methods

Public methods

evaluate

public Float evaluate (float fraction, 
                Float startValue, 
                Float endValue)

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 * (v1 - v0), where x0 is startValue, x1 is endValue, and t is fraction.

Parameters
fraction float: The fraction from the starting to the ending values

startValue Float: The start value; should be of type float or Float

endValue Float: The end value; should be of type float or Float

Returns
Float A linear interpolation between the start and end values, given the fraction parameter.

getInstance

public static FloatEvaluator getInstance ()

Returns an instance of FloatEvaluator that may be used in ValueAnimator.setEvaluator(TypeEvaluator). The same instance may be used in multiple Animators because it holds no state.

Returns
FloatEvaluator An instance of FloatEvaluator.