code: public static ParcelFileDescriptor blobFileDescriptorForQuery(SQLiteStatement prog,
              String[] selectionArgs) {
          prog.bindAllArgsAsStrings(selectionArgs);
          return prog.simpleQueryForBlobFileDescriptor();
      }
docs: Utility method to run the pre-compiled query and return the blob value in the
  first column of the first row.
  
  @return A read-only file descriptor for a copy of the blob value.