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SparseArrayCompat

public class SparseArrayCompat
extends Object implements Cloneable

java.lang.Object
   ↳ android.support.v4.util.SparseArrayCompat<E>


A copy of the current platform (currently KITKAT version of SparseArray; provides a removeAt() method and other things.

Summary

Public constructors

SparseArrayCompat()

Creates a new SparseArray containing no mappings.

SparseArrayCompat(int initialCapacity)

Creates a new SparseArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings.

Public methods

void append(int key, E value)

Puts a key/value pair into the array, optimizing for the case where the key is greater than all existing keys in the array.

void clear()

Removes all key-value mappings from this SparseArray.

SparseArrayCompat<E> clone()

Creates and returns a copy of this Object.

void delete(int key)

Removes the mapping from the specified key, if there was any.

E get(int key)

Gets the Object mapped from the specified key, or null if no such mapping has been made.

E get(int key, E valueIfKeyNotFound)

Gets the Object mapped from the specified key, or the specified Object if no such mapping has been made.

int indexOfKey(int key)

Returns the index for which keyAt(int) would return the specified key, or a negative number if the specified key is not mapped.

int indexOfValue(E value)

Returns an index for which valueAt(int) would return the specified key, or a negative number if no keys map to the specified value.

int keyAt(int index)

Given an index in the range 0...size()-1, returns the key from the indexth key-value mapping that this SparseArray stores.

void put(int key, E value)

Adds a mapping from the specified key to the specified value, replacing the previous mapping from the specified key if there was one.

void remove(int key)

Alias for delete(int).

void removeAt(int index)

Removes the mapping at the specified index.

void removeAtRange(int index, int size)

Remove a range of mappings as a batch.

void setValueAt(int index, E value)

Given an index in the range 0...size()-1, sets a new value for the indexth key-value mapping that this SparseArray stores.

int size()

Returns the number of key-value mappings that this SparseArray currently stores.

String toString()

Returns a string containing a concise, human-readable description of this object.

This implementation composes a string by iterating over its mappings.

E valueAt(int index)

Given an index in the range 0...size()-1, returns the value from the indexth key-value mapping that this SparseArray stores.

Inherited methods

From class java.lang.Object

Public constructors

SparseArrayCompat

SparseArrayCompat ()

Creates a new SparseArray containing no mappings.

SparseArrayCompat

SparseArrayCompat (int initialCapacity)

Creates a new SparseArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings. If you supply an initial capacity of 0, the sparse array will be initialized with a light-weight representation not requiring any additional array allocations.

Parameters
initialCapacity int

Public methods

append

void append (int key, 
                E value)

Puts a key/value pair into the array, optimizing for the case where the key is greater than all existing keys in the array.

Parameters
key int
value E

clear

void clear ()

Removes all key-value mappings from this SparseArray.

clone

SparseArrayCompat<E> clone ()

Creates and returns a copy of this Object. The default implementation returns a so-called "shallow" copy: It creates a new instance of the same class and then copies the field values (including object references) from this instance to the new instance. A "deep" copy, in contrast, would also recursively clone nested objects. A subclass that needs to implement this kind of cloning should call super.clone() to create the new instance and then create deep copies of the nested, mutable objects.

Returns
SparseArrayCompat<E> a copy of this object.

delete

void delete (int key)

Removes the mapping from the specified key, if there was any.

Parameters
key int

get

E get (int key)

Gets the Object mapped from the specified key, or null if no such mapping has been made.

Parameters
key int
Returns
E

get

E get (int key, 
                E valueIfKeyNotFound)

Gets the Object mapped from the specified key, or the specified Object if no such mapping has been made.

Parameters
key int
valueIfKeyNotFound E
Returns
E

indexOfKey

int indexOfKey (int key)

Returns the index for which keyAt(int) would return the specified key, or a negative number if the specified key is not mapped.

Parameters
key int
Returns
int

indexOfValue

int indexOfValue (E value)

Returns an index for which valueAt(int) would return the specified key, or a negative number if no keys map to the specified value.

Beware that this is a linear search, unlike lookups by key, and that multiple keys can map to the same value and this will find only one of them.

Note also that unlike most collections' indexOf methods, this method compares values using == rather than equals.

Parameters
value E
Returns
int

keyAt

int keyAt (int index)

Given an index in the range 0...size()-1, returns the key from the indexth key-value mapping that this SparseArray stores.

Parameters
index int
Returns
int

put

void put (int key, 
                E value)

Adds a mapping from the specified key to the specified value, replacing the previous mapping from the specified key if there was one.

Parameters
key int
value E

remove

void remove (int key)

Alias for delete(int).

Parameters
key int

removeAt

void removeAt (int index)

Removes the mapping at the specified index.

Parameters
index int

removeAtRange

void removeAtRange (int index, 
                int size)

Remove a range of mappings as a batch.

Parameters
index int: Index to begin at
size int: Number of mappings to remove

setValueAt

void setValueAt (int index, 
                E value)

Given an index in the range 0...size()-1, sets a new value for the indexth key-value mapping that this SparseArray stores.

Parameters
index int
value E

size

int size ()

Returns the number of key-value mappings that this SparseArray currently stores.

Returns
int

toString

String toString ()

Returns a string containing a concise, human-readable description of this object. Subclasses are encouraged to override this method and provide an implementation that takes into account the object's type and data. The default implementation is equivalent to the following expression:

   getClass().getName() + '@' + Integer.toHexString(hashCode())

See Writing a useful toString method if you intend implementing your own toString method.

This implementation composes a string by iterating over its mappings. If this map contains itself as a value, the string "(this Map)" will appear in its place.

Returns
String a printable representation of this object.

valueAt

E valueAt (int index)

Given an index in the range 0...size()-1, returns the value from the indexth key-value mapping that this SparseArray stores.

Parameters
index int
Returns
E
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