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Android APIs
public final class

Channels

extends Object
java.lang.Object
   ↳ java.nio.channels.Channels

Class Overview

This class provides several utilities to get I/O streams from channels.

Summary

Public Methods
static WritableByteChannel newChannel(OutputStream outputStream)
Returns a writable channel on the given output stream.
static ReadableByteChannel newChannel(InputStream inputStream)
Returns a readable channel on the given input stream.
static InputStream newInputStream(ReadableByteChannel channel)
Returns an input stream on the given channel.
static OutputStream newOutputStream(WritableByteChannel channel)
Returns an output stream on the given channel.
static Reader newReader(ReadableByteChannel channel, CharsetDecoder decoder, int minBufferCapacity)
Returns a reader that decodes bytes from a channel.
static Reader newReader(ReadableByteChannel channel, String charsetName)
Returns a reader that decodes bytes from a channel.
static Writer newWriter(WritableByteChannel channel, String charsetName)
Returns a writer that encodes characters with the specified encoder and sends the bytes to the specified channel.
static Writer newWriter(WritableByteChannel channel, CharsetEncoder encoder, int minBufferCapacity)
Returns a writer that encodes characters with the specified encoder and sends the bytes to the specified channel.
[Expand]
Inherited Methods
From class java.lang.Object

Public Methods

public static WritableByteChannel newChannel (OutputStream outputStream)

Since: API Level 1

Returns a writable channel on the given output stream. The resulting channel has following properties:

  • If the channel is closed, then the underlying stream is closed as well.
  • It is not buffered.

Parameters
outputStream the stream to be wrapped by a byte channel.
Returns
  • a byte channel that writes bytes to the output stream.

public static ReadableByteChannel newChannel (InputStream inputStream)

Since: API Level 1

Returns a readable channel on the given input stream. The resulting channel has the following properties:

  • If the channel is closed, then the underlying stream is closed as well.
  • It is not buffered.

Parameters
inputStream the stream to be wrapped by a byte channel.
Returns
  • a byte channel that reads bytes from the input stream.

public static InputStream newInputStream (ReadableByteChannel channel)

Since: API Level 1

Returns an input stream on the given channel. The resulting stream has the following properties:

  • If the stream is closed, then the underlying channel is closed as well.
  • It is thread safe.
  • It throws an IllegalBlockingModeException if the channel is in non-blocking mode and read is called.
  • Neither mark nor reset is supported.
  • It is not buffered.

Parameters
channel the channel to be wrapped by an InputStream.
Returns
  • an InputStream that takes bytes from the given byte channel.

public static OutputStream newOutputStream (WritableByteChannel channel)

Since: API Level 1

Returns an output stream on the given channel. The resulting stream has the following properties:

  • If the stream is closed, then the underlying channel is closed as well.
  • It is thread safe.
  • It throws an IllegalBlockingModeException if the channel is in non-blocking mode and write is called.
  • It is not buffered.

Parameters
channel the channel to be wrapped by an OutputStream.
Returns
  • an OutputStream that puts bytes onto the given byte channel.

public static Reader newReader (ReadableByteChannel channel, CharsetDecoder decoder, int minBufferCapacity)

Since: API Level 1

Returns a reader that decodes bytes from a channel.

Parameters
channel the Channel to be read.
decoder the Charset decoder to be used.
minBufferCapacity The minimum size of the byte buffer, -1 means to use the default size.
Returns
  • the reader.

public static Reader newReader (ReadableByteChannel channel, String charsetName)

Since: API Level 1

Returns a reader that decodes bytes from a channel. This method creates a reader with a buffer of default size.

Parameters
channel the Channel to be read.
charsetName the name of the charset.
Returns
  • the reader.
Throws
UnsupportedCharsetException if the given charset name is not supported.

public static Writer newWriter (WritableByteChannel channel, String charsetName)

Since: API Level 1

Returns a writer that encodes characters with the specified encoder and sends the bytes to the specified channel. This method creates a writer with a buffer of default size.

Parameters
channel the Channel to be written to.
charsetName the name of the charset.
Returns
  • the writer.
Throws
UnsupportedCharsetException if the given charset name is not supported.

public static Writer newWriter (WritableByteChannel channel, CharsetEncoder encoder, int minBufferCapacity)

Since: API Level 1

Returns a writer that encodes characters with the specified encoder and sends the bytes to the specified channel.

Parameters
channel the Channel to write to.
encoder the CharsetEncoder to be used.
minBufferCapacity the minimum size of the byte buffer, -1 means to use the default size.
Returns
  • the writer.