Android: GUID Primary key
The yellow box in the storage guide says:
Android does not impose anylimitations beyond the standard SQLiteconcepts. We do recommend including anautoincrement value key field that canbe used as a unique ID to quickly finda record. This is not required forprivate data, but if you implement acontent provider, you must include aunique ID using the BaseColumns._IDconstant.
Now when you click on the BaseColumns class you will see
public static final String _IDThe unique ID for a row.
Type: INTEGER (long)
Constant Value: "_id"
So I guess, a GUID will not work.