Added in API level 1

Closeable

interface Closeable : AutoCloseable

java.io.Closeable

Known Direct Subclasses

AppSearchSession, AssetFileDescriptor, BlobStoreManager.Session, BluetoothServerSocket, BluetoothSocket, Channel, Cursor, DatagramSocket, DirectoryStream, DropBoxManager.Entry, FileSystem, Formatter, and 35 others.

AppSearchSession	Provides a connection to a single AppSearch database.
AssetFileDescriptor	File descriptor of an entry in the AssetManager.
BlobStoreManager.Session	Represents an ongoing session of a blob's contribution to the blob store managed by the system.
BluetoothServerSocket	A listening Bluetooth socket.
BluetoothSocket	A connected or connecting Bluetooth socket.
Channel	A nexus for I/O operations.
Cursor	This interface provides random read-write access to the result set returned by a database query.
DatagramSocket	This class represents a socket for sending and receiving datagram packets.
DirectoryStream	An object to iterate over the entries in a directory.
DropBoxManager.Entry	A single entry retrieved from the drop box.
FileSystem	Provides an interface to a file system and is the factory for objects to access files and other objects in the file system.
Formatter	An interpreter for printf-style format strings.
GlobalSearchSession	Provides a connection to all AppSearch databases the querying application has been granted access to.
HttpResponseCache	Caches HTTP and HTTPS responses to the filesystem so they may be reused, saving time and bandwidth.
InputStream	This abstract class is the superclass of all classes representing an input stream of bytes.
JsonReader	Reads a JSON (RFC 4627) encoded value as a stream of tokens.
JsonWriter	Writes a JSON (RFC 4627) encoded value to a stream, one token at a time.
LocalServerSocket	Non-standard class for creating an inbound UNIX-domain socket in the Linux abstract namespace.
LocalSocket	Creates a (non-server) socket in the UNIX-domain namespace.
MediaDataSource	For supplying media data to the framework.
MidiDevice	This class is used for sending and receiving data to and from a MIDI device Instances of this class are created by `MidiManager#openDevice`.
MidiDevice.MidiConnection	This class represents a connection between the output port of one device and the input port of another.
MidiInputPort	This class is used for sending data to a port on a MIDI device
MidiOutputPort	This class is used for receiving data from a port on a MIDI device
OutputStream	This abstract class is the superclass of all classes representing an output stream of bytes.
PackageInstaller.Session	An installation that is being actively staged.
ParcelFileDescriptor	The FileDescriptor returned by `Parcel#readFileDescriptor`, allowing you to close it when done with it.
PerformanceHintManager.Session	A Session represents a group of threads with an inter-related workload such that hints for their performance should be considered as a unit.
PrintStream	A `PrintStream` adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
RandomAccessFile	Instances of this class support both reading and writing to a random access file.
Reader	Abstract class for reading character streams.
ResourcesProvider	Provides methods to load resources data from APKs (`.apk`) and resources tables (eg.
SQLiteClosable	An object created from a SQLiteDatabase that can be closed.
SQLiteRawStatement	A represents a SQLite prepared statement.
Scanner	A simple text scanner which can parse primitive types and strings using regular expressions.
SearchResults	Encapsulates results of a search operation.
Selector	A multiplexor of `SelectableChannel` objects.
ServerSocket	This class implements server sockets.
SharedMemory	SharedMemory enables the creation, mapping, and protection control over anonymous shared memory.
Socket	This class implements client sockets (also called just "sockets").
SurfaceControl.Transaction	An atomic set of changes to a set of SurfaceControl.
TagTechnology	is an interface to a technology in a `Tag`
URLClassLoader	This class loader is used to load classes and resources from a search path of URLs referring to both JAR files and directories.
UploadDataProvider	Abstract class allowing the embedder to provide an upload body to `UrlRequest`.
WatchService	A watch service that watches registered objects for changes and events.
Writer	Abstract class for writing to character streams.
ZipFile	This class is used to read entries from a zip file.

Known Indirect Subclasses

AbstractCursor, AbstractInterruptibleChannel, AbstractInterruptibleChannel, AbstractSelectableChannel, AbstractSelectableChannel, AbstractSelectableChannel, AbstractSelector, AbstractWindowedCursor, AssetFileDescriptor.AutoCloseInputStream, AssetFileDescriptor.AutoCloseOutputStream, AssetManager.AssetInputStream, AsynchronousByteChannel, and 143 others.

AbstractCursor	This is an abstract cursor class that handles a lot of the common code that all cursors need to deal with and is provided for convenience reasons.
AbstractInterruptibleChannel	Base implementation class for interruptible channels.
AbstractInterruptibleChannel	Base implementation class for interruptible channels.
AbstractSelectableChannel	Base implementation class for selectable channels.
AbstractSelectableChannel	Base implementation class for selectable channels.
AbstractSelectableChannel	Base implementation class for selectable channels.
AbstractSelector	Base implementation class for selectors.
AbstractWindowedCursor	A base class for Cursors that store their data in `CursorWindow`s.
AssetFileDescriptor.AutoCloseInputStream	An InputStream you can create on a ParcelFileDescriptor, which will take care of calling android.
AssetFileDescriptor.AutoCloseOutputStream	An OutputStream you can create on a ParcelFileDescriptor, which will take care of calling android.
AssetManager.AssetInputStream
AsynchronousByteChannel	An asynchronous channel that can read and write bytes.
AsynchronousChannel	A channel that supports asynchronous I/O operations.
AsynchronousFileChannel	An asynchronous channel for reading, writing, and manipulating a file.
AsynchronousServerSocketChannel	An asynchronous channel for stream-oriented listening sockets.
AsynchronousServerSocketChannel	An asynchronous channel for stream-oriented listening sockets.
AsynchronousSocketChannel	An asynchronous channel for stream-oriented connecting sockets.
AsynchronousSocketChannel	An asynchronous channel for stream-oriented connecting sockets.
BackupDataInputStream	Provides an `java.io.InputStream`-like interface for accessing an entity's data during a restore operation.
Base64InputStream	An InputStream that does Base64 decoding on the data read through it.
Base64OutputStream	An OutputStream that does Base64 encoding on the data written to it, writing the resulting data to another OutputStream.
BufferedInputStream	A `BufferedInputStream` adds functionality to another input stream-namely, the ability to buffer the input and to support the `mark` and `reset` methods.
BufferedOutputStream	The class implements a buffered output stream.
BufferedReader	Reads text from a character-input stream, buffering characters so as to provide for the efficient reading of characters, arrays, and lines.
BufferedWriter	Writes text to a character-output stream, buffering characters so as to provide for the efficient writing of single characters, arrays, and strings.
ByteArrayInputStream	A `ByteArrayInputStream` contains an internal buffer that contains bytes that may be read from the stream.
ByteArrayOutputStream	This class implements an output stream in which the data is written into a byte array.
ByteChannel	A channel that can read and write bytes.
ByteChannel	A channel that can read and write bytes.
Channel	Instances of this class represent an ISO/IEC 7816-4 channel opened to a Secure Element.
CharArrayReader	This class implements a character buffer that can be used as a character-input stream.
CharArrayWriter	This class implements a character buffer that can be used as an Writer.
CheckedInputStream	An input stream that also maintains a checksum of the data being read.
CheckedOutputStream	An output stream that also maintains a checksum of the data being written.
CipherInputStream	A CipherInputStream is composed of an InputStream and a Cipher so that read() methods return data that are read in from the underlying InputStream but have been additionally processed by the Cipher.
CipherOutputStream	A CipherOutputStream is composed of an OutputStream and a Cipher so that write() methods first process the data before writing them out to the underlying OutputStream.
CrossProcessCursor	A cross process cursor is an extension of a `Cursor` that also supports usage from remote processes.
CrossProcessCursorWrapper	Cursor wrapper that implements `CrossProcessCursor`.
CrossProcessCursorWrapper	Cursor wrapper that implements `CrossProcessCursor`.
CursorWindow	A buffer containing multiple cursor rows.
CursorWrapper	Wrapper class for Cursor that delegates all calls to the actual cursor object.
DataInputStream	A data input stream lets an application read primitive Java data types from an underlying input stream in a machine-independent way.
DataOutputStream	A data output stream lets an application write primitive Java data types to an output stream in a portable way.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DatagramChannel	A selectable channel for datagram-oriented sockets.
DeflaterInputStream	Implements an input stream filter for compressing data in the "deflate" compression format.
DeflaterOutputStream	This class implements an output stream filter for compressing data in the "deflate" compression format.
DigestInputStream	A transparent stream that updates the associated message digest using the bits going through the stream.
DigestOutputStream	A transparent stream that updates the associated message digest using the bits going through the stream.
FileChannel	A channel for reading, writing, mapping, and manipulating a file.
FileChannel	A channel for reading, writing, mapping, and manipulating a file.
FileChannel	A channel for reading, writing, mapping, and manipulating a file.
FileChannel	A channel for reading, writing, mapping, and manipulating a file.
FileChannel	A channel for reading, writing, mapping, and manipulating a file.
FileChannel	A channel for reading, writing, mapping, and manipulating a file.
FileInputStream	A `FileInputStream` obtains input bytes from a file in a file system.
FileOutputStream	A file output stream is an output stream for writing data to a `File` or to a `FileDescriptor`.
FileReader	Reads text from character files using a default buffer size.
FileWriter	Writes text to character files using a default buffer size.
FilterInputStream	A `FilterInputStream` contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality.
FilterOutputStream	This class is the superclass of all classes that filter output streams.
FilterReader	Abstract class for reading filtered character streams.
FilterWriter	Abstract class for writing filtered character streams.
GZIPInputStream	This class implements a stream filter for reading compressed data in the GZIP file format.
GZIPOutputStream	This class implements a stream filter for writing compressed data in the GZIP file format.
GatheringByteChannel	A channel that can write bytes from a sequence of buffers.
InflaterInputStream	This class implements a stream filter for uncompressing data in the "deflate" compression format.
InflaterOutputStream	Implements an output stream filter for uncompressing data stored in the "deflate" compression format.
InputStreamReader	An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified .
InterruptibleChannel	A channel that can be asynchronously closed and interrupted.
IsoDep	Provides access to ISO-DEP (ISO 14443-4) properties and I/O operations on a `Tag`.
JarFile	The `JarFile` class is used to read the contents of a jar file from any file that can be opened with `java.io.RandomAccessFile`.
JarInputStream	The `JarInputStream` class is used to read the contents of a JAR file from any input stream.
JarOutputStream	The `JarOutputStream` class is used to write the contents of a JAR file to any output stream.
LineNumberInputStream	This class is an input stream filter that provides the added functionality of keeping track of the current line number.
LineNumberReader	A buffered character-input stream that keeps track of line numbers.
MatrixCursor	A mutable cursor implementation backed by an array of `Object`s.
MergeCursor	A convenience class that lets you present an array of Cursors as a single linear Cursor.
MifareClassic	Provides access to MIFARE Classic properties and I/O operations on a `Tag`.
MifareUltralight	Provides access to MIFARE Ultralight properties and I/O operations on a `Tag`.
MockCursor	A mock `android.database.Cursor` class that isolates the test code from real Cursor implementation.
MulticastChannel	A network channel that supports Internet Protocol (IP) multicasting.
MulticastSocket	The multicast datagram socket class is useful for sending and receiving IP multicast packets.
Ndef	Provides access to NDEF content and operations on a `Tag`.
NdefFormatable	Provide access to NDEF format operations on a `Tag`.
NetworkChannel	A channel to a network socket.
NfcA	Provides access to NFC-A (ISO 14443-3A) properties and I/O operations on a `Tag`.
NfcB	Provides access to NFC-B (ISO 14443-3B) properties and I/O operations on a `Tag`.
NfcBarcode	Provides access to tags containing just a barcode.
NfcF	Provides access to NFC-F (JIS 6319-4) properties and I/O operations on a `Tag`.
NfcV	Provides access to NFC-V (ISO 15693) properties and I/O operations on a `Tag`.
ObjectInputStream	An ObjectInputStream deserializes primitive data and objects previously written using an ObjectOutputStream.
ObjectOutputStream	An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream.
OutputStreamWriter	An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified .
ParcelFileDescriptor.AutoCloseInputStream	An InputStream you can create on a ParcelFileDescriptor, which will take care of calling android.
ParcelFileDescriptor.AutoCloseOutputStream	An OutputStream you can create on a ParcelFileDescriptor, which will take care of calling android.
Pipe.SinkChannel	A channel representing the writable end of a `Pipe`.
Pipe.SinkChannel	A channel representing the writable end of a `Pipe`.
Pipe.SinkChannel	A channel representing the writable end of a `Pipe`.
Pipe.SinkChannel	A channel representing the writable end of a `Pipe`.
Pipe.SinkChannel	A channel representing the writable end of a `Pipe`.
Pipe.SourceChannel	A channel representing the readable end of a `Pipe`.
Pipe.SourceChannel	A channel representing the readable end of a `Pipe`.
Pipe.SourceChannel	A channel representing the readable end of a `Pipe`.
Pipe.SourceChannel	A channel representing the readable end of a `Pipe`.
Pipe.SourceChannel	A channel representing the readable end of a `Pipe`.
PipedInputStream	A piped input stream should be connected to a piped output stream; the piped input stream then provides whatever data bytes are written to the piped output stream.
PipedOutputStream	A piped output stream can be connected to a piped input stream to create a communications pipe.
PipedReader	Piped character-input streams.
PipedWriter	Piped character-output streams.
PrintStream	A `PrintStream` adds functionality to another output stream, namely the ability to print representations of various data values conveniently.
PrintWriter	Prints formatted representations of objects to a text-output stream.
PushbackInputStream	A `PushbackInputStream` adds functionality to another input stream, namely the ability to "push back" or "unread" bytes, by storing pushed-back bytes in an internal buffer.
PushbackReader	A character-stream reader that allows characters to be pushed back into the stream.
ReadableByteChannel	A channel that can read bytes.
SQLiteCursor	A Cursor implementation that exposes results from a query on a `SQLiteDatabase`.
SQLiteDatabase	Exposes methods to manage a SQLite database.
SQLiteProgram	A base class for compiled SQLite programs.
SQLiteQuery	Represents a query that reads the resulting rows into a `SQLiteQuery`.
SQLiteStatement	Represents a statement that can be executed against a database.
SSLServerSocket	This class extends `ServerSocket`s and provides secure server sockets using protocols such as the Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocols.
SSLSocket	This class extends `Socket`s and provides secure socket using protocols such as the "Secure Sockets Layer" (SSL) or IETF "Transport Layer Security" (TLS) protocols.
ScatteringByteChannel	A channel that can read bytes into a sequence of buffers.
SecureDirectoryStream	A `DirectoryStream` that defines operations on files that are located relative to an open directory.
SeekableByteChannel	A byte channel that maintains a current position and allows the position to be changed.
SeekableByteChannel	A byte channel that maintains a current position and allows the position to be changed.
SelectableChannel	A channel that can be multiplexed via a `Selector`.
SelectableChannel	A channel that can be multiplexed via a `Selector`.
SelectableChannel	A channel that can be multiplexed via a `Selector`.
SensorDirectChannel	Class representing a sensor direct channel.
SequenceInputStream	A `SequenceInputStream` represents the logical concatenation of other input streams.
ServerSocketChannel	A selectable channel for stream-oriented listening sockets.
ServerSocketChannel	A selectable channel for stream-oriented listening sockets.
ServerSocketChannel	A selectable channel for stream-oriented listening sockets.
ServerSocketChannel	A selectable channel for stream-oriented listening sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
SocketChannel	A selectable channel for stream-oriented connecting sockets.
StringBufferInputStream	This class allows an application to create an input stream in which the bytes read are supplied by the contents of a string.
StringReader	A character stream whose source is a string.
StringWriter	A character stream that collects its output in a string buffer, which can then be used to construct a string.
WritableByteChannel	A channel that can write bytes.
ZipInputStream	This class implements an input stream filter for reading files in the ZIP file format.
ZipOutputStream	This class implements an output stream filter for writing files in the ZIP file format.

A Closeable is a source or destination of data that can be closed. The close method is invoked to release resources that the object is holding (such as open files).

Summary

Public methods
abstract Unit	`close()` Closes this stream and releases any system resources associated with it.

Public methods

close

Added in API level 1

abstract fun close(): Unit

Closes this stream and releases any system resources associated with it. If the stream is already closed then invoking this method has no effect.

As noted in AutoCloseable#close(), cases where the close may fail require careful attention. It is strongly advised to relinquish the underlying resources and to internally mark the Closeable as closed, prior to throwing the IOException.

Exceptions
`java.lang.Exception`	if this resource cannot be closed
`java.io.IOException`	if an I/O error occurs