Android threading and database locking

Question

We are using AsyncTasks to access database tables and cursors.

Unfortunately we are seeing occasional exceptions regarding the database being locked.

Answer 1

I solved this same exception just by making sure all my database opens have closes, and (more importantly) to assure this, making the scope of each database instance local ONLY to the method that needs it. ContentProvider is a good, safe class to use when accessing a db from multiple threads, but also make sure you're using good db practices:

• Keep db instances local (no SQLiteDatabase class members!)
• call close() on the db in the same method in which it's opened
• call close() on the cursors you get from the db
• listen to LogCat for any complaints that SQLiteDatabse might have