Room – LiveData observer does not trigger when database is updated

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I had a similar problem using Dagger 2 that was caused by having different instances of the Dao, one for updating/inserting data, and a different instance providing the LiveData for observing. Once I configured Dagger to manage a singleton instance of the Dao, then I could insert data in the background (in my case in a Service) while observing LiveData in my Activity – and the onChange() callback would be called.

It comes down to the instance of the Dao must be the same instance that is inserting/updating data and providing LiveData for observation.

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