Communication layer between a Flutter project for Android and IOS and a companion wearable app.

This will send and recieve messages and/or data to the platform specific wearable communication methood. It uses the wearable data layer and messaging API's on android devices and WCSession on IPhones


๐Ÿค– Android

  • add implementation 'com.google.android.gms:play-services-wearable:17.0.0' to the app level build.gradle

  • make sure that the applicationId of your WearOS app is the same as the one on your phone app


How to use

  • For information on how to access the sent data on wearable devices please see the example project
  • It is recommended to not rely on instantaneous transfer of data on IOS as applicationContext waits for a "low intensity situation" to set this value between app and watch

๐Ÿ“ค Sending messages

Use the static method WearableCommunicator.sendMessage(Map<String, dynamic> message); to send a single shot message.

  • on android the path "/MessageChannel" will be used for all messages

example send message

  "text": "Some text",
  "integerValue": 1

๐Ÿ“จ Recieve message

Use the static method WearableCommunicator.listenForMessage; to register a message listener function.

  • (android specific) if the message data is a string then the library will assume it is JSON and try to convert it. if that operation fails the message data will be sent to the listener unchanged.

Recieve message example

// msg is either a Map<String, dynamic> or a string (make sure to check for that when using the library)
WearableListener.listenForMessage((msg) {

๐Ÿ“• set data item (datalayer/userConfig)

Use the static method WearableCommunicator.setData(String path, Map<String, dynamic> message); to set a data item with specified path (use wearOS compatible data layer paths)

  • (IOS specific) the path variable is used as a key within the application context dictionary
  • (IOS specific) data transfer is not instant and will wait for a "low intensity" moment. use this function only to set permanent low priority information

example set data

    "name": "Nicolas Cage",
    "awesomeRating": 100

๐Ÿ“– listen to data events

Use the static method WearableCommunicator.listenForDataLayer; to register a data listener function.

  • (android specific) if the data is a string then the library will assume it is JSON and try to convert it. if that operation fails the data will be sent to the listener unchanged.

example listen for data

// data should be a Map<String, dynamic> but can also be a string under exceptional circumstances
WearableListener.listenForDataLayer((data) {

๐Ÿ“ notes

  • currently does not support nested data structures on android. Therefore it is recommended to send complex items as json strings to be parsed on the recieving end
  • Supported types in communications are
    • Strings
    • Integers
    • Floats
    • Double
    • Long
    • Boolean
    • Single type lists of strings, floats, ints or longs
    • TODO Nested Maps (will be converted to JSON on android)


  • X Send messages from android though the messageClient
  • X recieve messages from WearOS
  • X Send messages from IOS though the messageClient
  • X recieve messages from watchOS
  • X set android data layer items
  • X set IOS application context
  • X recieve data layer events from wearOS
  • X recieve data/configuration changes from watchOS (updates are not instant)
  • Handle complex/nested data structures (not nececary for initial release)
  • fetch data items from permanent storage (data layer/app config) note: low priority
  • set up background service to sync data in background


๐Ÿ•ด๐Ÿป Dagur Arinbjรถrn Danรญelsson
๐Ÿ“ฉ Email
๐Ÿ”— LinkedIn