DataReader

Kotlin |Java

@UnstableApi
public interface DataReader

Known direct subclasses

DataSource, ExtractorInput

`DataSource`	Reads data from URI-identified resources.
`ExtractorInput`	Provides data to be consumed by an `Extractor`.

Known indirect subclasses

`AesCipherDataSource`	A `DataSource` that decrypts the data read from an upstream source.
`AssetDataSource`	A `DataSource` for reading from a local asset.
`BaseDataSource`	Base `DataSource` implementation to keep a list of `TransferListener`s.
`ByteArrayDataSource`	A `DataSource` for reading from a byte array.
`CacheDataSource`	A `DataSource` that reads and writes a `Cache`.
`ContentDataSource`	A `DataSource` for reading from a content URI.
`CronetDataSource`	DataSource without intermediate buffer based on Cronet API set using UrlRequest.
`DataSchemeDataSource`	A `DataSource` for reading data URLs, as defined by RFC 2397.
`DefaultDataSource`	A `DataSource` that supports multiple URI schemes.
`DefaultExtractorInput`	An `ExtractorInput` that wraps a `DataReader`.
`DefaultHttpDataSource`	An `HttpDataSource` that uses Android's `HttpURLConnection`.
`FakeDataSource`	A fake `DataSource` capable of simulating various scenarios.
`FakeExtractorInput`	A fake `ExtractorInput` capable of simulating various scenarios.
`FileDataSource`	A `DataSource` for reading local files.
`ForwardingExtractorInput`	An overridable `ExtractorInput` implementation forwarding all methods to another input.
`HttpDataSource`	An HTTP `DataSource`.
`HttpEngineDataSource`	DataSource without intermediate buffer based on `HttpEngine` set using `UrlRequest`.
`OkHttpDataSource`	An `HttpDataSource` that delegates to Square's `Call.Factory`.
`PlaceholderDataSource`	A DataSource which provides no data.
`PriorityDataSource`	A `DataSource` that can be used as part of a task registered with a .
`RawResourceDataSource`	A `DataSource` for reading a raw resource.
`ResolvingDataSource`	`DataSource` wrapper allowing just-in-time resolution of `DataSpecs`.
`RtmpDataSource`	A Real-Time Messaging Protocol (RTMP) `DataSource`.
`StatsDataSource`	`DataSource` wrapper which keeps track of bytes transferred, redirected uris, and response headers.
`TeeDataSource`	Tees data into a `DataSink` as the data is read.
`UdpDataSource`	A UDP `DataSource`.

Reads bytes from a data stream.

Summary

Public methods
`abstract int`	`read(byte[] buffer, int offset, int length)` Reads up to `length` bytes of data from the input.

Public methods

read

abstract int read(byte[] buffer, int offset, int length)

Reads up to length bytes of data from the input.

If readLength is zero then 0 is returned. Otherwise, if no data is available because the end of the opened range has been reached, then RESULT_END_OF_INPUT is returned. Otherwise, the call will block until at least one byte of data has been read and the number of bytes read is returned.

Parameters
`byte[] buffer`	A target array into which data should be written.
`int offset`	The offset into the target array at which to write.
`int length`	The maximum number of bytes to read from the input.

Returns
`int`	The number of bytes read, or `RESULT_END_OF_INPUT` if the input has ended. This may be less than `length` because the end of the input (or available data) was reached, the method was interrupted, or the operation was aborted early for another reason.

Throws
`java.io.IOException`	If an error occurs reading from the input.