TypeEvaluator

interface TypeEvaluator<T>

Known direct subclasses
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 setEvaluator 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.

Parameters
<T>

the type of value to be evaluated

See also
setEvaluator

Summary

Public methods

abstract @NonNull T
evaluate(float fraction, @NonNull T startValue, @NonNull T 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.

Public methods

evaluate

abstract @NonNullevaluate(float fraction, @NonNull T startValue, @NonNull T 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 * (x1 - x0), where x0 is startValue, x1 is endValue, and t is fraction.

Parameters
float fraction

The fraction from the starting to the ending values

@NonNull T startValue

The start value.

@NonNull T endValue

The end value.

Returns
@NonNull T

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