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added in version 22.1.0

android.support.v4.util

Interfaces

Pools.Pool<T> Interface for managing a pool of objects. 

Classes

ArrayMap<K, V> ArrayMap is a generic key->value mapping data structure that is designed to be more memory efficient than a traditional HashMap, this implementation is a version of the platform's android.util.ArrayMap that can be used on older versions of the platform. 
ArraySet<E> ArraySet is a generic set data structure that is designed to be more memory efficient than a traditional HashSet
AtomicFile Static library support version of the framework's AtomicFile, a helper class for performing atomic operations on a file by creating a backup file until a write has successfully completed. 
CircularArray<E> CircularArray is a generic circular array data structure that provides O(1) random read, O(1) prepend and O(1) append. 
CircularIntArray CircularIntArray is a circular integer array data structure that provides O(1) random read, O(1) prepend and O(1) append. 
LongSparseArray<E> SparseArray mapping longs to Objects, a version of the platform's android.util.LongSparseArray that can be used on older versions of the platform. 
LruCache<K, V> Static library version of android.util.LruCache
ObjectsCompat This class consists of static utility methods for operating on objects. 
Pair<F, S> Container to ease passing around a tuple of two objects. 
PatternsCompat Commonly used regular expression patterns. 
Pools Helper class for creating pools of objects. 
Pools.SimplePool<T> Simple (non-synchronized) pool of objects. 
Pools.SynchronizedPool<T> Synchronized) pool of objects. 
SimpleArrayMap<K, V> Base implementation of ArrayMap that doesn't include any standard Java container API interoperability. 
SparseArrayCompat<E> SparseArrays map integers to Objects.