code: public double getDouble(String columnName, double defaultValue) {
          int index = getColumnIndex(columnName);
          if (isValidIndex(index)) {
              return getDouble(index);
          } else {
              return defaultValue;
          }
      }
docs: Convenience alias to {@code getDouble\(getColumnIndex(columnName))}. If the column does not
  exist for the cursor, return {@code defaultValue}.