Android SQLIte: my helper class methods should be static synchronized?

Thanks for your help. I have been reading various posts on the subject, but I feel I need to further clarify this.

In my app various threads access my db for read/write operations.

So: I understand that the SQLiteOpenHelper must be only one across my application, and I use a singleton to deal with it, no problem.

But I have a Helper class that uses the SQLiteOpenHelper sigleton to provide more encapsulated methods (like insertAllMyStuff(Stuff)).

Now my doubts, regarding the Helper are the following:

• CAN I make the Helper and its methods static?
• SHOULD I make the Helper and its methods static?
• SHOULD I RATHER use a non static Helper class?

My concern is not corrupting the db (that won't happen since I hold always a single instance of the SQLiteOpenHelper) BUT rather:

• will other wild things happen if I multiple threads access the same static methods? (like inserting bar instead of foo, I am afraid yes)
• if i use synchronized methods the app will slow down a lot.

Do I really NEED a ContentProvider to solve this??(I'd prefer not to use it)

Thanks

LISA