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Showing content from https://api.flutter.dev/javadoc/io/flutter/plugin/common/MethodChannel.html below:

MethodChannel

A named channel for communicating with the Flutter application using asynchronous method calls.

Incoming method calls are decoded from binary on receipt, and Java results are encoded into binary before being transmitted back to Flutter. The MethodCodec used must be compatible with the one used by the Flutter application. This can be achieved by creating a MethodChannel counterpart of this channel on the Dart side. The Java type of method call arguments and results is Object, but only values supported by the specified MethodCodec can be used.

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

• Nested Class Summary

  Nested Classes

  static interface 

  A handler of incoming method calls.

  static interface 

  Method call result callback.

• Constructor Summary

  Constructors

• Method Summary

  void

  Invokes a method on this channel, expecting no result.

  void

  Invokes a method on this channel, optionally expecting a result.

  void

  Adjusts the number of messages that will get buffered when sending messages to channels that aren't fully set up yet.

  void

  Registers a method call handler on this channel.

  void

  Toggles whether the channel should show warning messages when discarding messages due to overflow.

  Methods inherited from class java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Constructor Details
  • MethodChannel

    Parameters:

    messenger - a BinaryMessenger.

    name - a channel name String.

  • MethodChannel

    Parameters:

    messenger - a BinaryMessenger.

    name - a channel name String.

    codec - a MessageCodec.

  • MethodChannel

    Parameters:

    messenger - a BinaryMessenger.

    name - a channel name String.

    codec - a MessageCodec.

    taskQueue - a BinaryMessenger.TaskQueue that specifies what thread will execute the handler. Specifying null means execute on the platform thread. See also BinaryMessenger.makeBackgroundTaskQueue().

• Method Details
  • invokeMethod @UiThread public void invokeMethod(@NonNull String method, @Nullable Object arguments)

    Invokes a method on this channel, expecting no result.

    Parameters:

    method - the name String of the method.

    arguments - the arguments for the invocation, possibly null.

  • invokeMethod

    Any uncaught exception thrown by the result callback will be caught and logged.

    Parameters:

    method - the name String of the method.

    arguments - the arguments for the invocation, possibly null.

    callback - a MethodChannel.Result callback for the invocation result, or null.

  • setMethodCallHandler

    Registers a method call handler on this channel.

    Overrides any existing handler registration for (the name of) this channel.

    If no handler has been registered, any incoming method call on this channel will be handled silently by sending a null reply. This results in a MissingPluginException on the Dart side, unless an OptionalMethodChannel is used.

    Parameters:

    handler - a MethodChannel.MethodCallHandler, or null to deregister.

  • resizeChannelBuffer

    public void resizeChannelBuffer(int newSize)

    Adjusts the number of messages that will get buffered when sending messages to channels that aren't fully set up yet. For example, the engine isn't running yet or the channel's message handler isn't set up on the Dart side yet.

  • setWarnsOnChannelOverflow

    public void setWarnsOnChannelOverflow(boolean warns)

    Toggles whether the channel should show warning messages when discarding messages due to overflow. When 'warns' is false the channel is expected to overflow and warning messages will not be shown.

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