public static interface BinaryMessenger.BinaryMessageHandler
@UiThread void onMessage(@Nullable ByteBuffer message, @NonNull BinaryMessenger.BinaryReply reply)
Handler implementations must reply to all incoming messages, by submitting a single reply
message to the given
BinaryMessenger.BinaryReply. Failure to do so will result in lingering Flutter
reply handlers. The reply may be submitted asynchronously.
Any uncaught exception thrown by this method will be caught by the messenger implementation and logged, and a null reply message will be sent back to Flutter.