code: public int update(String table, ContentValues values, String whereClause, String[] whereArgs) {
          return updateWithOnConflict(table, values, whereClause, whereArgs, CONFLICT_NONE);
      }
docs: Convenience method for updating rows in the database.
  
  @param table the table to update in
  @param values a map from column names to new column values. null is a
  valid value that will be translated to NULL.
  @param whereClause the optional WHERE clause to apply when updating.
  Passing null will update all rows.
  @param whereArgs You may include ?s in the where clause, which
  will be replaced by the values from whereArgs. The values
  will be bound as Strings.
  @return the number of rows affected