com.android.volley.toolbox

类 DiskBasedCache

java.lang.Object

com.android.volley.toolbox.DiskBasedCache

所有已实现的接口:

Cache

public class DiskBasedCache
extends Object
implements Cache

Cache implementation that caches files directly onto the hard disk in the specified directory. The default disk usage size is 5MB, but is configurable.

嵌套类概要

从接口继承的嵌套类/接口 com.android.volley.Cache

Cache.Entry

构造器概要

构造器

构造器和说明
DiskBasedCache(File rootDirectory) Constructs an instance of the DiskBasedCache at the specified directory using the default maximum cache size of 5MB.
DiskBasedCache(File rootDirectory, int maxCacheSizeInBytes) Constructs an instance of the DiskBasedCache at the specified directory.

方法概要

限定符和类型	方法和说明
void	clear() Clears the cache.
Cache.Entry	get(String key) Returns the cache entry with the specified key if it exists, null otherwise.
File	getFileForKey(String key) Returns a file object for the given cache key.
void	initialize() Initializes the DiskBasedCache by scanning for all files currently in the specified root directory.
void	invalidate(String key, boolean fullExpire) Invalidates an entry in the cache.
void	put(String key, Cache.Entry entry) Puts the entry with the specified key into the cache.
void	remove(String key) Removes the specified key from the cache if it exists.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

DiskBasedCache

public DiskBasedCache(File rootDirectory,
                      int maxCacheSizeInBytes)

Constructs an instance of the DiskBasedCache at the specified directory.

参数:

rootDirectory - The root directory of the cache.

maxCacheSizeInBytes - The maximum size of the cache in bytes.

DiskBasedCache

public DiskBasedCache(File rootDirectory)

Constructs an instance of the DiskBasedCache at the specified directory using the default maximum cache size of 5MB.

参数:

rootDirectory - The root directory of the cache.

方法详细资料

clear

public void clear()

Clears the cache. Deletes all cached files from disk.

指定者:

clear 在接口中 Cache

get

public Cache.Entry get(String key)

Returns the cache entry with the specified key if it exists, null otherwise.

指定者:

get 在接口中 Cache

参数:

key - Cache key

返回:

An Cache.Entry or null in the event of a cache miss

initialize

public void initialize()

Initializes the DiskBasedCache by scanning for all files currently in the specified root directory. Creates the root directory if necessary.

指定者:

initialize 在接口中 Cache

invalidate

public void invalidate(String key,
                       boolean fullExpire)

Invalidates an entry in the cache.

指定者:

invalidate 在接口中 Cache

参数:

key - Cache key

fullExpire - True to fully expire the entry, false to soft expire

put

public void put(String key,
                Cache.Entry entry)

Puts the entry with the specified key into the cache.

指定者:

put 在接口中 Cache

参数:

key - Cache key

entry - Data to store and metadata for cache coherency, TTL, etc.

remove

public void remove(String key)

Removes the specified key from the cache if it exists.

指定者:

remove 在接口中 Cache

参数:

key - Cache key

getFileForKey

public File getFileForKey(String key)

Returns a file object for the given cache key.