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Added in API level 16

public class

LongSparseArray

extends Object
implements Cloneable

java.lang.Object
↳	android.util.LongSparseArray<E>

Class Overview

SparseArray mapping longs to Objects. Unlike a normal array of Objects, there can be gaps in the indices. It is intended to be more efficient than using a HashMap to map Longs to Objects.

Summary

Public Constructors
? Examples	LongSparseArray() Creates a new LongSparseArray containing no mappings.
? Examples	LongSparseArray(int initialCapacity) Creates a new LongSparseArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings.

Public Methods
? Examples	void	append(long 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.
? Examples	void	clear() Removes all key-value mappings from this LongSparseArray.
? Examples	LongSparseArray<E>	clone() Creates and returns a copy of this `Object`.
? Examples	void	delete(long key) Removes the mapping from the specified key, if there was any.
? Examples	E	get(long key, E valueIfKeyNotFound) Gets the Object mapped from the specified key, or the specified Object if no such mapping has been made.
? Examples	E	get(long key) Gets the Object mapped from the specified key, or `null` if no such mapping has been made.
? Examples	int	indexOfKey(long key) Returns the index for which `keyAt(int)` would return the specified key, or a negative number if the specified key is not mapped.
? Examples	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.
? Examples	long	keyAt(int index) Given an index in the range `0...size()-1`, returns the key from the `index`th key-value mapping that this LongSparseArray stores.
? Examples	void	put(long 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.
? Examples	void	remove(long key) Alias for `delete(long)`.
? Examples	void	removeAt(int index) Removes the mapping at the specified index.
? Examples	void	setValueAt(int index, E value) Given an index in the range `0...size()-1`, sets a new value for the `index`th key-value mapping that this LongSparseArray stores.
? Examples	int	size() Returns the number of key-value mappings that this LongSparseArray currently stores.
? Examples	E	valueAt(int index) Given an index in the range `0...size()-1`, returns the value from the `index`th key-value mapping that this LongSparseArray stores.

[Expand]

Inherited Methods

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals( Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Public Constructors

public LongSparseArray ()

Added in API level 16

Creates a new LongSparseArray containing no mappings.

public LongSparseArray (int initialCapacity)

Added in API level 16

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

Public Methods

public void append (long key, E value)

Added in API level 16

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

public void clear ()

Added in API level 16

Removes all key-value mappings from this LongSparseArray.

public LongSparseArray<E> clone ()

Added in API level 16

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

a copy of this object.

public void delete (long key)

Added in API level 16

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

public E get (long key, E valueIfKeyNotFound)

Added in API level 16

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

public E get (long key)

Added in API level 16

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

public int indexOfKey (long key)

Added in API level 16

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

public int indexOfValue (E value)

Added in API level 16

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.

public long keyAt (int index)

Added in API level 16

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

public void put (long key, E value)

Added in API level 16

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

public void remove (long key)

Added in API level 16

Alias for delete(long).

public void removeAt (int index)

Added in API level 16

Removes the mapping at the specified index.

public void setValueAt (int index, E value)

Added in API level 16

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

public int size ()

Added in API level 16

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

public E valueAt (int index)

Added in API level 16

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

information

No examples for this method.

Frequently called with: [Clear]

This example was provided by APIMiner.

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Exceptions

LongSparseArray

Class Overview

Summary

Public Constructors

public LongSparseArray ()

public LongSparseArray (int initialCapacity)

Public Methods

public void append (long key, E value)

public void clear ()

public LongSparseArray<E> clone ()

Returns

public void delete (long key)

public E get (long key, E valueIfKeyNotFound)

public E get (long key)

public int indexOfKey (long key)

public int indexOfValue (E value)

public long keyAt (int index)

public void put (long key, E value)

public void remove (long key)

public void removeAt (int index)

public void setValueAt (int index, E value)

public int size ()

public E valueAt (int index)