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Android Reference

SparseLongArray


android.util

Class SparseLongArray

  • All Implemented Interfaces:
    Cloneable


    public class SparseLongArray
    extends Object
    implements Cloneable
    SparseLongArrays map integers to longs. Unlike a normal array of longs, there can be gaps in the indices. It is intended to be more efficient than using a HashMap to map Integers to Longs.
    • Constructor Summary

      Constructors
      Constructor and Description
      SparseLongArray()
      Creates a new SparseLongArray containing no mappings.
      SparseLongArray(int initialCapacity)
      Creates a new SparseLongArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      void append(int key, long 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 SparseIntArray.
      SparseLongArray clone()
      Creates and returns a copy of this Object.
      void delete(int key)
      Removes the mapping from the specified key, if there was any.
      long get(int key)
      Gets the long mapped from the specified key, or 0 if no such mapping has been made.
      long get(int key, long valueIfKeyNotFound)
      Gets the long mapped from the specified key, or the specified value 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(long 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 SparseLongArray stores.
      void put(int key, long 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 removeAt(int index)
      Removes the mapping at the given index.
      int size()
      Returns the number of key-value mappings that this SparseIntArray currently stores.
      long valueAt(int index)
      Given an index in the range 0...size()-1, returns the value from the indexth key-value mapping that this SparseLongArray stores.
    • Constructor Detail

      • SparseLongArray

        public SparseLongArray()
        Creates a new SparseLongArray containing no mappings.
      • SparseLongArray

        public SparseLongArray(int initialCapacity)
        Creates a new SparseLongArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings.
    • Method Detail

      • clone

        public SparseLongArray clone()
        Description copied from class: Object
        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.
        Overrides:
        clone in class Object
        Returns:
        a copy of this object.
      • get

        public long get(int key)
        Gets the long mapped from the specified key, or 0 if no such mapping has been made.
      • get

        public long get(int key,
               long valueIfKeyNotFound)
        Gets the long mapped from the specified key, or the specified value if no such mapping has been made.
      • delete

        public void delete(int key)
        Removes the mapping from the specified key, if there was any.
      • removeAt

        public void removeAt(int index)
        Removes the mapping at the given index.
      • put

        public void put(int key,
               long value)
        Adds a mapping from the specified key to the specified value, replacing the previous mapping from the specified key if there was one.
      • size

        public int size()
        Returns the number of key-value mappings that this SparseIntArray currently stores.
      • keyAt

        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 SparseLongArray stores.
      • valueAt

        public long valueAt(int index)
        Given an index in the range 0...size()-1, returns the value from the indexth key-value mapping that this SparseLongArray stores.
      • indexOfKey

        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.
      • indexOfValue

        public int indexOfValue(long 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.
      • clear

        public void clear()
        Removes all key-value mappings from this SparseIntArray.
      • append

        public void append(int key,
                  long 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.


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