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BasicMessageChannel class - services library

A named channel for communicating with platform plugins using asynchronous message passing.

Messages are encoded into binary before being sent, and binary messages received are decoded into Dart values. The MessageCodec used must be compatible with the one used by the platform plugin. This can be achieved by creating a basic message channel counterpart of this channel on the platform side. The Dart type of messages sent and received is T, but only the values supported by the specified MessageCodec can be used. The use of unsupported values should be considered programming errors, and will result in exceptions being thrown. The null message is supported for all codecs.

The logical identity of the channel is given by its name. Identically named channels will interfere with each other's communication.

All BasicMessageChannels provided by the Flutter framework guarantee FIFO ordering. Applications can assume messages sent via a built-in BasicMessageChannel are delivered in the same order as they're sent.

See: flutter.dev/to/platform-channels/

Available extensions

• TestBasicMessageChannelExtension

BasicMessageChannel.new(String name, MessageCodec<T> codec, {BinaryMessenger? binaryMessenger})

Creates a BasicMessageChannel with the specified name, codec and binaryMessenger.

const

binaryMessenger → BinaryMessenger

The messenger which sends the bytes for this channel.

no setter

codec → MessageCodec<T>

The message codec used by this channel, not null.

final

hashCode → int

The hash code for this object.

no setterinherited

name → String

The logical channel on which communication happens, not null.

final

runtimeType → Type

A representation of the runtime type of the object.

no setterinherited

checkMockMessageHandler(Object? handler) → bool

Available on BasicMessageChannel<T>, provided by the TestBasicMessageChannelExtension extension

Shim for TestDefaultBinaryMessenger.checkMockMessageHandler.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

send(T message) → Future<T?>

Sends the specified message to the platform plugins on this channel.

setMessageHandler(Future<T> handler(T? message)?) → void

Sets a callback for receiving messages from the platform plugins on this channel. Messages may be null.

setMockMessageHandler(Future<T> handler(T? message)?) → void

Available on BasicMessageChannel<T>, provided by the TestBasicMessageChannelExtension extension

Shim for TestDefaultBinaryMessenger.setMockDecodedMessageHandler.

toString() → String

A string representation of this object.

inherited

operator ==(Object other) → bool

The equality operator.

inherited

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