Android
android.util
public class

android.util.SparseArray<E>

java.lang.Object
android.util.SparseArray<E>

SparseArrays map integers 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 Integers to Objects.

Summary

Public Constructors

            SparseArray()
Creates a new SparseArray containing no mappings.
            SparseArray(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.
          void  delete(int key)
Removes the mapping from the specified key, if there was any.
          get(int key, E valueIfKeyNotFound)
Gets the Object mapped from the specified key, or the specified Object if no such mapping has been made.
          get(int key)
Gets the Object mapped from the specified key, or null 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  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.
          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.
Methods inherited from class java.lang.Object

Details

Public Constructors

public SparseArray()

Creates a new SparseArray containing no mappings.

public SparseArray(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

public 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.

public void clear()

Removes all key-value mappings from this SparseArray.

public void delete(int key)

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

public 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.

public E get(int key)

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

public 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.

public 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.

public 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.

public 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.

public void remove(int key)

Alias for delete(int).

public 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.

public int size()

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

public 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.
Copyright 2007 Google Inc. Build 0.9_r1-98467 - 14 Aug 2008 18:56