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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 representation of the 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 precise meaning of "copy" may depend on the class of the object. The general intent is that, for any object x, the expression:

 x.clone() != x
will be true, and that the expression:
 x.clone().getClass() == x.getClass()
will be true, but these are not absolute requirements. While it is typically the case that:
 x.clone().equals(x)
will be true, this is not an absolute requirement.

By convention, the returned object should be obtained by calling super.clone. If a class and all of its superclasses (except Object) obey this convention, it will be the case that x.clone().getClass() == x.getClass().

By convention, the object returned by this method should be independent of this object (which is being cloned). To achieve this independence, it may be necessary to modify one or more fields of the object returned by super.clone before returning it. Typically, this means copying any mutable objects that comprise the internal "deep structure" of the object being cloned and replacing the references to these objects with references to the copies. If a class contains only primitive fields or references to immutable objects, then it is usually the case that no fields in the object returned by super.clone need to be modified.

The method clone for class Object performs a specific cloning operation. First, if the class of this object does not implement the interface Cloneable, then a CloneNotSupportedException is thrown. Note that all arrays are considered to implement the interface Cloneable and that the return type of the clone method of an array type T[] is T[] where T is any reference or primitive type. Otherwise, this method creates a new instance of the class of this object and initializes all its fields with exactly the contents of the corresponding fields of this object, as if by assignment; the contents of the fields are not themselves cloned. Thus, this method performs a "shallow copy" of this object, not a "deep copy" operation.

The class Object does not itself implement the interface Cloneable, so calling the clone method on an object whose class is Object will result in throwing an exception at run time.

Returns
SparseArrayCompat<E> a clone of this instance.

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 representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method.

The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

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

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 string representation of the 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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