FloatArrayEvaluator

Kotlin |Java

class FloatArrayEvaluator : TypeEvaluator<FloatArray!>

kotlin.Any
↳	androidx.core.animation.FloatArrayEvaluator

This evaluator can be used to perform type interpolation between float[] values. Each index into the array is treated as a separate value to interpolate. For example, evaluating {100, 200} and {300, 400} will interpolate the value at the first index between 100 and 300 and the value at the second index value between 200 and 400.

Summary

Public constructors
<init>() Create a FloatArrayEvaluator that does not reuse the animated value.
<init>(@Nullable reuseArray: FloatArray?) Create a FloatArrayEvaluator that reuses reuseArray for every evaluate() call.

Public methods
FloatArray	evaluate(fraction: Float, @NonNull startValue: FloatArray, @NonNull endValue: FloatArray) Interpolates the value at each index by the fraction.

Public constructors

<init>

FloatArrayEvaluator()

Create a FloatArrayEvaluator that does not reuse the animated value. Care must be taken when using this option because on every evaluation a new float[] will be allocated.

See Also

• #FloatArrayEvaluator(float[])

<init>

FloatArrayEvaluator(@Nullable reuseArray: FloatArray?)

Create a FloatArrayEvaluator that reuses reuseArray for every evaluate() call. Caution must be taken to ensure that the value returned from androidx.core.animation.ValueAnimator#getAnimatedValue() is not cached, modified, or used across threads. The value will be modified on each evaluate() call.

Parameters
reuseArray	FloatArray?: The array to modify and return from evaluate.

Public methods

evaluate

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

Interpolates the value at each index by the fraction. If FloatArrayEvaluator(float[]) was used to construct this object, reuseArray will be returned, otherwise a new float[] will be returned.

Parameters
fraction	Float: The fraction from the starting to the ending values
startValue	FloatArray: The start value.
endValue	FloatArray: The end value.

Return
FloatArray	A float[] where each element is an interpolation between the same index in startValue and endValue.