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Changelog: Twilio Sync Android SDK

Latest release

The latest release of the Sync SDK for Android is v0.9.0, published on Bintray.

Version History & Changelog

Links are provided to specific patch versions here. We don't recommend using these links unless you have a specific need for a certain patch of a release.

Sync SDK for Android v0.9.0 (August 7, 2020)


  • SDK has switched to android native SSLSocket implementation (, resulting in a noticeable decrease in final application size compared to previous release 0.8.7.

Known issues

  • Recovery takes more time after network loss compared to previous release 0.8.7.

Sync SDK for Android v0.8.7 (January 14, 2020)


  • Minor bugfixes and stability improvements

Sync SDK for Android v0.8.6 (October 17, 2019)


  • Decreased the minimum Android SDK version to 19.
  • Included the Proguard rules for Twilio classes with SDK package.

Sync SDK for Android v0.8.5 (September 27, 2019)


  • Fixed stack dump symbolication on Сrashlytics.
  • Reduced SDK footprint, resulting in a noticeable decrease in final application size compared to release 0.8.2
  • Fixed an issue where a completion handler is called more than once when publishing messages to a deleted stream.
  • Fixed an bug where the StreamObserver.onRemoved() event is received twice.

Sync SDK for Android v0.8.2 (June 26, 2019)


  • Improved stability on shutdown, fixed crash issue

Sync SDK for Android v0.8.1 (April 16, 2019)


  • Improved connection reliability under bad network conditions.
  • Fixed unexpected connectivity errors with code 1401: Unable to establish connection to Twilio Sync service.
  • Increased targetSdkVersion to 28 in preparation for Google SDK policy targeted in August; minSdkVersion remains 21.

Sync SDK for Android v0.8.0 (March 7, 2019)


  • Overhauled transport and communication layer, significantly improving network traffic overhead and client performance
  • SDK size reduction - it gained over the course of the year, so we sent it to the gym. Native libraries are now repackaged and optimized for size.

Sync SDK for Android v0.7.2 (May 23, 2018)


  • Improve privacy compliance: by default use log level SILENT to not output anything from SDK by default. Switch to higher debug level using SyncClient.setLogLevel() to receive log messages.

Sync SDK for Android v0.7.1 (March 2, 2018)


  • Observer interfaces will no longer receive onErrorOccurred events when a failure to open Document, List, Map or Stream occurs. The SuccessListener for such operations is the best way to check for success or failure on open/creation.
  • Resolved issue with connection state listener, where onConnectionStateChanged event was not called on the user thread.
  • Resolved issue with SuccessListeners where events for openDocument, openMap, openList, openStream were not called on the user thread.
  • Resolved issue where remote update events may not be received after the same object got opened multiple times concurrently.

Sync SDK for Android v0.7.0 (February 15, 2018)


Synopsis of enhancements:

  • FlowId has been deprecated in favor of passing the resulting object to the listeners now, where previously arguments to listeners were Void.
  • The distinction between remote (for remotely initiated operations) and result (for locally initiated operations) has been transitioned to EventContext's isLocal() flag. The callback interfaces are thus simplified, by combining onResultXYZ and onRemoteXYZ events under the same method.
  • Documents, Lists (and their items), Maps (and their items) and Streams may now all have an optional max time to live specified. This number is expressed in seconds and is relative to when the TTL is set. After the TTL expires, the object will be destroyed on the backend in the near future. Options has been expanded to allow specifying a TTL during object creation (this property is ignored when opening preexisting objects.) The Metadata classes taken as a parameter for some methods on Document, List and Map are optional and can be specified as null.

Migration tips:

FlowId has been removed globally; most methods that previously accepted a flowID now also accept metadata which can be null today if you are not specifying a TTL.

Most observer methods have changed signature. The individual remote and local observer methods have been combined into a single observer method for operations. Observers which previously received only an index or key will now also receive the full value. Most observer methods now also provide a EventContext object which will indicate whether the operation was locally or remotely initiated.

Update squashing:

Individual local operations will continue to return the status of each operation via their SuccessListener interface but updates sent to the server may be batched for efficiency. This means remote clients may not see every state update performed individually, but will instead see updates with the object's final updated state.

If you require updates to be treated as individual operations for purposes of notifying remote clients, it is recommended you schedule subsequent updates to occur after the completion of each operation.

Other enhancements and bugfixes:

  • Enabled returning null from mutator functions, gracefully abandoning data change operations.
  • Added SDK version logging on startup, with "Twilio Sync SDK version {VERSION}" text.
  • Added SyncClient.setLogLevel() method to configure the SDK log level for troubleshooting purposes.
  • Fixed a race condition with an early arriving collection item remote update events.
  • Fixed support for multicasting events to observers attached to de-duplicated instances of objects, i.e. where the same object SID is opened multiple times.
  • Provided a fix against crash on Android Oreo.
  • Listeners added via SyncClient.setConnectionStateListener() will now receive callbacks in the correct thread.

Sync SDK for Android v0.6.3 (February 1, 2018)


  • Updated internal certificate store for upcoming certificate authority changes.

Sync SDK for Android v0.6.2 (January 9, 2018)


  • Optimized SDK speed
  • Optimized SDK size
  • Improved SDK stability
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