Added in API level 26

CompletionHandler

interface CompletionHandler<V : Any!, A : Any!>

java.nio.channels.CompletionHandler

A handler for consuming the result of an asynchronous I/O operation.

The asynchronous channels defined in this package allow a completion handler to be specified to consume the result of an asynchronous operation. The completed method is invoked when the I/O operation completes successfully. The failed method is invoked if the I/O operations fails. The implementations of these methods should complete in a timely manner so as to avoid keeping the invoking thread from dispatching to other completion handlers.

Summary

Public methods
abstract Unit	`completed(result: V, attachment: A)` Invoked when an operation has completed.
abstract Unit	`failed(exc: Throwable!, attachment: A)` Invoked when an operation fails.

Public methods

completed

Added in API level 26

abstract fun completed(
    result: V, 
    attachment: A
): Unit

Invoked when an operation has completed.

Parameters
`result`	V: The result of the I/O operation.
`attachment`	A: The object attached to the I/O operation when it was initiated.

failed

Added in API level 26

abstract fun failed(
    exc: Throwable!, 
    attachment: A
): Unit

Invoked when an operation fails.

Parameters
`exc`	Throwable!: The exception to indicate why the I/O operation failed
`attachment`	A: The object attached to the I/O operation when it was initiated.