Backup Room database

This doesn’t answer the original question

How can I properly re-open room db after I close it?

However, moving everything to the original database file is what you want to do, then you don’t have to close the database in the first place. You can instead force a checkpoint using the wal_checkpoint pragma.

Query the following statement against the database. We use raw queries here as pragma is not yet supported by Room (it will trigger a UNKNOWN query type error). Have this query inside of your DAO:

int checkpoint(SupportSQLiteQuery supportSQLiteQuery);

And then when you call the checkpoint method, use the query then:

myDAO.checkpoint(new SimpleSQLiteQuery("pragma wal_checkpoint(full)"));

This link may shed some light on what wal_checkpoint does.

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