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BidirectionalTypeConverter

public abstract class BidirectionalTypeConverter
extends TypeConverter<T, V>

java.lang.Object
   ↳ androidx.core.animation.TypeConverter<T, V>
     ↳ androidx.core.animation.BidirectionalTypeConverter<T, V>


Abstract base class used convert type T to another type V and back again. This is necessary when the value types of in animation are different from the property type. BidirectionalTypeConverter is needed when only the final value for the animation is supplied to animators.

Summary

Public constructors

BidirectionalTypeConverter(Class<T> fromClass, Class<V> toClass)

Constructor for creating a bidirectional type converter instance that can convert type T to another type V and back again.

Public methods

abstract T convertBack(V value)

Does a conversion from the target type back to the source type.

BidirectionalTypeConverter<V, T> invert()

Returns the inverse of this converter, where the from and to classes are reversed.

Inherited methods

Public constructors

BidirectionalTypeConverter

public BidirectionalTypeConverter (Class<T> fromClass, 
                Class<V> toClass)

Constructor for creating a bidirectional type converter instance that can convert type T to another type V and back again.

Parameters
fromClass Class: class of type T

toClass Class: class of type V

Public methods

convertBack

public abstract T convertBack (V value)

Does a conversion from the target type back to the source type. The subclass must implement this when a TypeConverter is used in animations and current values will need to be read for an animation.

Parameters
value V: The Object to convert.

Returns
T A value of type T, converted from value.

invert

public BidirectionalTypeConverter<V, T> invert ()

Returns the inverse of this converter, where the from and to classes are reversed. The inverted converter uses this convert to call convertBack(Object) for TypeConverter.convert(Object) calls and TypeConverter.convert(Object) for convertBack(Object) calls.

Returns
BidirectionalTypeConverter<V, T> The inverse of this converter, where the from and to classes are reversed.