TypeEvaluator

Kotlin |Java

public interface TypeEvaluator

android.animation.TypeEvaluator<T>

Known indirect 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.

See also:

ValueAnimator.setEvaluator(TypeEvaluator)

Summary

Public methods
`abstract T`	`evaluate(float fraction, T startValue, 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

Added in API level 11

public abstract T evaluate (float fraction, 
                T startValue, 
                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
`fraction`	`float`: The fraction from the starting to the ending values
`startValue`	`T`: The start value.
`endValue`	`T`: The end value.

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