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I have implemented a SyncAdapter, AccountManager and private ContentProvider along the lines of the SimpleSyncAdapter sample project in the SDK. It is all working well. Now I want to show a message to the user when new rows have been downloaded from the remote server that have a specific flag set. I need a callback from the SyncAdapter when a Sync has finished so I can do the query and display the message from an activity. I have seen a few questions on StackOverflow discussing this but none with a good answer. How does one listen for progress from Android SyncAdapter? says that the SyncStatusObserver is useless. User mobibob suggests using a ResultReceiver to respond back to the UI from the sync thread. How to know when sync is finished? suggests using an Intent in your SyncService. How to signal sync-complete to the Android SyncManager? suggests using the SyncResult. The example code linked to by maxpower47 uses the SyncResult class to report exceptions but not to actually report if a sync was successfully completed. I just don't know which is the best option and I have not seen any example projects where any of these solutions are used.

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