public
final
class
AssetManager
extends Object
implements
AutoCloseable
| java.lang.Object | |
| ↳ | android.content.res.AssetManager |
Provides access to an application's raw asset files; see Resources
for the way most applications will want to retrieve their resource data.
This class presents a lower-level API that allows you to open and read raw
files that have been bundled with the application as a simple stream of
bytes.
Nested classes | |
|---|---|
class |
AssetManager.AssetInputStream
|
Constants | |
|---|---|
int |
ACCESS_BUFFER
Mode for |
int |
ACCESS_RANDOM
Mode for |
int |
ACCESS_STREAMING
Mode for |
int |
ACCESS_UNKNOWN
Mode for |
Public methods | |
|---|---|
void
|
close()
Close this asset manager. |
final
String[]
|
getLocales()
Get the locales that this asset manager contains data for. |
final
String[]
|
list(String path)
Return a String array of all the assets at the given path. |
final
InputStream
|
open(String fileName, int accessMode)
Open an asset using an explicit access mode, returning an InputStream to read its contents. |
final
InputStream
|
open(String fileName)
Open an asset using ACCESS_STREAMING mode. |
final
AssetFileDescriptor
|
openFd(String fileName)
|
final
AssetFileDescriptor
|
openNonAssetFd(String fileName)
|
final
AssetFileDescriptor
|
openNonAssetFd(int cookie, String fileName)
|
final
XmlResourceParser
|
openXmlResourceParser(int cookie, String fileName)
Retrieve a parser for a compiled XML file. |
final
XmlResourceParser
|
openXmlResourceParser(String fileName)
Retrieve a parser for a compiled XML file. |
Protected methods | |
|---|---|
void
|
finalize()
Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. |
Inherited methods | |
|---|---|
 From
class
java.lang.Object
| |
From
interface
java.lang.AutoCloseable
| |
int ACCESS_BUFFER
Mode for open(String, int): Attempt to load contents into
memory, for fast small reads.
Constant Value: 3 (0x00000003)
int ACCESS_RANDOM
Mode for open(String, int): Read chunks, and seek forward and
backward.
Constant Value: 1 (0x00000001)
int ACCESS_STREAMING
Mode for open(String, int): Read sequentially, with an
occasional forward seek.
Constant Value: 2 (0x00000002)
int ACCESS_UNKNOWN
Mode for open(String, int): no specific information about how
data will be accessed.
Constant Value: 0 (0x00000000)
String[] getLocales ()
Get the locales that this asset manager contains data for.
On SDK 21 (Android 5.0: Lollipop) and above, Locale strings are valid
BCP-47 language tags and can be
parsed using forLanguageTag(String).
On SDK 20 (Android 4.4W: Kitkat for watches) and below, locale strings
are of the form ll_CC where ll is a two letter language code,
and CC is a two letter country code.
| Returns | |
|---|---|
String[] |
|
String[] list (String path)
Return a String array of all the assets at the given path.
| Parameters | |
|---|---|
path |
String:
A relative path within the assets, i.e., "docs/home.html". |
| Returns | |
|---|---|
String[] |
String[] Array of strings, one for each asset. These file names are relative to 'path'. You can open the file by concatenating 'path' and a name in the returned string (via File) and passing that to open(). |
| Throws | |
|---|---|
IOException |
|
See also:
InputStream open (String fileName, int accessMode)
Open an asset using an explicit access mode, returning an InputStream to read its contents. This provides access to files that have been bundled with an application as assets -- that is, files placed in to the "assets" directory.
| Parameters | |
|---|---|
fileName |
String:
The name of the asset to open. This name can be
hierarchical. |
accessMode |
int:
Desired access mode for retrieving the data. |
| Returns | |
|---|---|
InputStream |
|
| Throws | |
|---|---|
IOException |
|
InputStream open (String fileName)
Open an asset using ACCESS_STREAMING mode. This provides access to files that have been bundled with an application as assets -- that is, files placed in to the "assets" directory.
| Parameters | |
|---|---|
fileName |
String:
The name of the asset to open. This name can be
hierarchical. |
| Returns | |
|---|---|
InputStream |
|
| Throws | |
|---|---|
IOException |
|
See also:
AssetFileDescriptor openFd (String fileName)
| Parameters | |
|---|---|
fileName |
String
|
| Returns | |
|---|---|
AssetFileDescriptor |
|
| Throws | |
|---|---|
IOException |
|
AssetFileDescriptor openNonAssetFd (String fileName)
| Parameters | |
|---|---|
fileName |
String
|
| Returns | |
|---|---|
AssetFileDescriptor |
|
| Throws | |
|---|---|
IOException |
|
AssetFileDescriptor openNonAssetFd (int cookie, String fileName)
| Parameters | |
|---|---|
cookie |
int
|
fileName |
String
|
| Returns | |
|---|---|
AssetFileDescriptor |
|
| Throws | |
|---|---|
IOException |
|
XmlResourceParser openXmlResourceParser (int cookie, String fileName)
Retrieve a parser for a compiled XML file.
| Parameters | |
|---|---|
cookie |
int:
Identifier of the package to be opened. |
fileName |
String:
The name of the file to retrieve.
|
| Returns | |
|---|---|
XmlResourceParser |
|
| Throws | |
|---|---|
IOException |
|
XmlResourceParser openXmlResourceParser (String fileName)
Retrieve a parser for a compiled XML file.
| Parameters | |
|---|---|
fileName |
String:
The name of the file to retrieve.
|
| Returns | |
|---|---|
XmlResourceParser |
|
| Throws | |
|---|---|
IOException |
|
void finalize ()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
A subclass overrides the finalize method to dispose of
system resources or to perform other cleanup.
The general contract of finalize is that it is invoked
if and when the JavaTM virtual
machine has determined that there is no longer any
means by which this object can be accessed by any thread that has
not yet died, except as a result of an action taken by the
finalization of some other object or class which is ready to be
finalized. The finalize method may take any action, including
making this object available again to other threads; the usual purpose
of finalize, however, is to perform cleanup actions before
the object is irrevocably discarded. For example, the finalize method
for an object that represents an input/output connection might perform
explicit I/O transactions to break the connection before the object is
permanently discarded.
The finalize method of class Object performs no
special action; it simply returns normally. Subclasses of
Object may override this definition.
The Java programming language does not guarantee which thread will
invoke the finalize method for any given object. It is
guaranteed, however, that the thread that invokes finalize will not
be holding any user-visible synchronization locks when finalize is
invoked. If an uncaught exception is thrown by the finalize method,
the exception is ignored and finalization of that object terminates.
After the finalize method has been invoked for an object, no
further action is taken until the Java virtual machine has again
determined that there is no longer any means by which this object can
be accessed by any thread that has not yet died, including possible
actions by other objects or classes which are ready to be finalized,
at which point the object may be discarded.
The finalize method is never invoked more than once by a Java
virtual machine for any given object.
Any exception thrown by the finalize method causes
the finalization of this object to be halted, but is otherwise
ignored.
| Throws | |
|---|---|
Throwable |
|
Developers