Added in API level 19

AutoCloseable

interface AutoCloseable

java.lang.AutoCloseable

Known Direct Subclasses AssetManager, BaseStream, BluetoothCsipSetCoordinator, BluetoothLeAudio, BundleSession, CameraCaptureSession, CameraDevice, CameraExtensionSession, Closeable, Connection, ContentCaptureSession, ContentProviderClient, and 54 others. AssetManager Provides access to an application's raw asset files; see Resources for the way most applications will want to retrieve their resource data. BaseStream Base interface for streams, which are sequences of elements supporting sequential and parallel aggregate operations. BluetoothCsipSetCoordinator This class provides the public APIs to control the Bluetooth CSIP set coordinator. BluetoothLeAudio This class provides the public APIs to control the LeAudio profile. BundleSession An instances of this class represents a session with data stored in a bundle. CameraCaptureSession A configured capture session for a CameraDevice, used for capturing images from the camera or reprocessing images captured from the camera in the same session previously. CameraDevice The CameraDevice class is a representation of a single camera connected to an Android device, allowing for fine-grain control of image capture and post-processing at high frame rates. CameraExtensionSession A camera capture session that enables access to device-specific camera extensions, which often use multi-frame bursts and sophisticated post-process algorithms for image capture. Closeable A Closeable is a source or destination of data that can be closed. Connection A connection (session) with a specific database. ContentCaptureSession Session used when notifying the Android system about events associated with views. ContentProviderClient The public interface object used to interact with a specific ContentProvider. DiscoverySession A class representing a single publish or subscribe Aware session. DngCreator The DngCreator class provides functions to write raw pixel data as a DNG file. DrmManagerClient The main programming interface for the DRM framework. EditingSession Represents a session of media editing, for example, transcoding between formats, transmuxing or applying trimming or audio/video effects to a stream. FileLock A token representing a lock on a region of a file. GroupCall Class used to represent a single MBMS group call. HapticGenerator Haptic Generator(HG). HardwareBuffer HardwareBuffer wraps a native AHardwareBuffer object, which is a low-level object representing a memory buffer accessible by various hardware units. HardwareBufferRenderer Creates an instance of a hardware-accelerated renderer. IkeSession This class represents an IKE Session management object that allows for keying and management of android.net.IpSecTransforms. Image A single complete image buffer to use with a media source such as a MediaCodec or a CameraDevice. ImageDecoder A class for converting encoded images (like PNG, JPEG, WEBP, GIF, or HEIF) into Drawable or Bitmap objects. ImageReader The ImageReader class allows direct application access to image data rendered into a android.view.Surface ImageWriter The ImageWriter class allows an application to produce Image data into a android.view.Surface, and have it be consumed by another component like CameraDevice. IpSecManager.SecurityParameterIndex This class represents a reserved SPI. IpSecManager.UdpEncapsulationSocket This class provides access to a UDP encapsulation Socket. IpSecTransform This class represents a transform, which roughly corresponds to an IPsec Security Association. LightsManager.LightsSession Encapsulates a session that can be used to control device lights and represents the lifetime of the requests. LoudnessCodecController Class for getting recommended loudness parameter updates for audio decoders as they are used to play back media content according to the encoded format and current audio routing. MbmsDownloadSession This class provides functionality for file download over MBMS. MbmsGroupCallSession This class provides functionality for accessing group call functionality over MBMS. MbmsStreamingSession This class provides functionality for streaming media over MBMS. MediaCas MediaCas can be used to obtain keys for descrambling protected media streams, in conjunction with android.media.MediaDescrambler. MediaCas.Session Class for an open session with the CA system. MediaController2 This API is not generally intended for third party application developers. MediaDescrambler MediaDescrambler class can be used in conjunction with android.media.MediaCodec and android.media.MediaExtractor to decode media data scrambled by conditional access (CA) systems such as those in the ISO/IEC13818-1. MediaDrm MediaDrm can be used to obtain keys for decrypting protected media streams, in conjunction with android.media.MediaCrypto. MediaMetadataRetriever MediaMetadataRetriever class provides a unified interface for retrieving frame and meta data from an input media file. MediaSession2 This API is not generally intended for third party application developers. MultiResolutionImageReader The MultiResolutionImageReader class wraps a group of ImageReaders with the same format and different sizes, source camera Id, or camera sensor modes. NetworkStats Class providing enumeration over buckets of network usage statistics. ObjectInput ObjectInput extends the DataInput interface to include the reading of objects. ObjectOutput ObjectOutput extends the DataOutput interface to include writing of objects. PdfRenderer This class enables rendering a PDF document and selecting, searching, fast scrolling, annotations, etc. PdfRenderer.Page This class represents a PDF document page for rendering. PdfRendererPreV This class enables rendering a PDF document and selecting, searching, fast scrolling, annotations, etc from Android R till Android U. PdfRendererPreV.Page This class represents a PDF document page for rendering. PlaybackSession An instance of this class represents a session of media playback used to report playback metrics and events. RecordingSession An instances of this class represents a session of media recording. ResourcesProvider Provides methods to load resources data from APKs (.apk) and resources tables (eg. ResultSet A table of data representing a database result set, which is usually generated by executing a statement that queries the database. SQLiteOpenHelper A helper class to manage database creation and version management. SocketKeepalive Allows applications to request that the system periodically send specific packets on their behalf, using hardware offload to save battery power. Statement The object used for executing a static SQL statement and returning the results it produces. StreamingService Class used to represent a single MBMS stream. SubmissionPublisher A Flow.Publisher that asynchronously issues submitted (non-null) items to current subscribers until it is closed. SyncFence A SyncFence represents a synchronization primitive which signals when hardware units have completed work on a particular resource. TranscodingSession An instances of this class represents a session of media Transcoding. TypedArray Container for an array of values that were retrieved with Resources.Theme#obtainStyledAttributes(AttributeSet, int[], int, int) or Resources#obtainAttributes. VolumeShaper The VolumeShaper class is used to automatically control audio volume during media playback, allowing simple implementation of transition effects and ducking. WifiAwareSession This class represents a Wi-Fi Aware session - an attachment to the Wi-Fi Aware service through which the app can execute discovery operations. WifiManager.LocalOnlyHotspotReservation LocalOnlyHotspotReservation that contains the SoftApConfiguration for the active LocalOnlyHotspot request. WifiP2pManager.Channel A channel that connects the application to the Wifi p2p framework. XmlResourceParser The XML parsing interface returned for an XML resource.

Known Indirect Subclasses AbstractCursor, AbstractInterruptibleChannel, AbstractInterruptibleChannel, AbstractSelectableChannel, AbstractSelectableChannel, AbstractSelectableChannel, AbstractSelector, AbstractWindowedCursor, AppSearchSession, AssetFileDescriptor, AssetFileDescriptor.AutoCloseInputStream, AssetFileDescriptor.AutoCloseOutputStream, and 203 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 CursorWindows. AppSearchSession Provides a connection to a single AppSearch database. AssetFileDescriptor File descriptor of an entry in the AssetManager. 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. 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. 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. CallableStatement The interface used to execute SQL stored procedures. CameraConstrainedHighSpeedCaptureSession A constrained high speed capture session for a CameraDevice, used for capturing high speed images from the CameraDevice for high speed video recording use case. CameraOfflineSession A camera capture session that was switched to offline mode via successful call to CameraCaptureSession#switchToOffline. Channel A nexus for I/O operations. 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. Cursor This interface provides random read-write access to the result set returned by a database query. 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. DatagramSocket This class represents a socket for sending and receiving datagram packets. 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. DirectoryStream An object to iterate over the entries in a directory. DoubleStream A sequence of primitive double-valued elements supporting sequential and parallel aggregate operations. DropBoxManager.Entry A single entry retrieved from the drop box. 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. FileSystem Provides an interface to a file system and is the factory for objects to access files and other objects in the file system. 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. Formatter An interpreter for printf-style format strings. 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. 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. 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. InputStream This abstract class is the superclass of all classes representing an input stream of bytes. InputStreamReader An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified . IntStream A sequence of primitive int-valued elements supporting sequential and parallel aggregate operations. 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. 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. 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. 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. LongStream A sequence of primitive long-valued elements supporting sequential and parallel aggregate operations. MatrixCursor A mutable cursor implementation backed by an array of Objects. MediaDataSource For supplying media data to the framework. MergeCursor A convenience class that lets you present an array of Cursors as a single linear Cursor. 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 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. 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. ObjectOutputStream An ObjectOutputStream writes primitive data types and graphs of Java objects to an OutputStream. OutputStream This abstract class is the superclass of all classes representing an output stream of bytes. OutputStreamWriter An OutputStreamWriter is a bridge from character streams to byte streams: Characters written to it are encoded into bytes using a specified . 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. 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. 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. 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. PreparedStatement An object that represents a precompiled SQL statement. PrintStream A PrintStream adds functionality to another output stream, namely the ability to print representations of various data values conveniently. 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. PublishDiscoverySession A class representing a Aware publish session. 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. RandomAccessFile Instances of this class support both reading and writing to a random access file. ReadableByteChannel A channel that can read bytes. Reader Abstract class for reading character streams. ResourcesProvider Provides methods to load resources data from APKs (.apk) and resources tables (eg. RowSet The interface that adds support to the JDBC API for the JavaBeansTM component model. SQLiteClosable An object created from a SQLiteDatabase that can be closed. 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. SQLiteRawStatement A represents a SQLite prepared statement. SQLiteStatement Represents a statement that can be executed against a database. SSLServerSocket This class extends ServerSockets and provides secure server sockets using protocols such as the Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocols. SSLSocket This class extends Sockets and provides secure socket using protocols such as the "Secure Sockets Layer" (SSL) or IETF "Transport Layer Security" (TLS) protocols. Scanner A simple text scanner which can parse primitive types and strings using regular expressions. ScatteringByteChannel A channel that can read bytes into a sequence of buffers. SearchResults Encapsulates results of a search operation. 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. Selector A multiplexor of SelectableChannel objects. SensorDirectChannel Class representing a sensor direct channel. SequenceInputStream A SequenceInputStream represents the logical concatenation of other input streams. ServerSocket This class implements server 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. ServerSocketChannel A selectable channel for stream-oriented listening sockets. SharedMemory SharedMemory enables the creation, mapping, and protection control over anonymous shared memory. Socket This class implements client sockets (also called just "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. Stream A sequence of elements supporting sequential and parallel aggregate operations. 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. SubscribeDiscoverySession A class representing a Aware subscribe session. 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. WritableByteChannel A channel that can write bytes. Writer Abstract class for writing to character streams. ZipFile This class is used to read entries from a zip file. 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.

An object that may hold resources (such as file or socket handles) until it is closed. The close() method of an AutoCloseable object is called automatically when exiting a try-with-resources block for which the object has been declared in the resource specification header. This construction ensures prompt release, avoiding resource exhaustion exceptions and errors that may otherwise occur.

Summary

Public methods
abstract Unit	close() Closes this resource, relinquishing any underlying resources.

Public methods

close

Added in API level 19

abstract fun close(): Unit

Closes this resource, relinquishing any underlying resources. This method is invoked automatically on objects managed by the try-with-resources statement.

Exceptions
java.lang.Exception	if this resource cannot be closed