android - 从 sqlhelper 类的游标获取数据到另一个活动

Question

如何从另一个类中获取列索引（category._id 或 categorylang.Title）。

代码：

public Set<Category> getTopCategories() {
    final List<Integer> loadedTopCats = new ArrayList<Integer>(0);
    this.cursor = this.db.rawQuery(
            "SELECT DISTINCT category.ParentID FROM category" +
                    " INNER JOIN categorylang ON category._id = categorylang.CategoryID" +
                    " INNER JOIN questiontable" +
                    " ON categorylang.CategoryID = questiontable.CategoryID" +
                    " WHERE category.ParentID != 0" +
                    " AND questiontable.QuestionID IS NOT NULL" ,
                    null);

    while (this.cursor.moveToNext()) {
        loadedTopCats.add(this.cursor.getInt(0));
    }
    this.cursor.close();
    final StringBuilder allTopCatIds = new StringBuilder(loadedTopCats.size() * 2);

    for (final Integer i : loadedTopCats) {
        allTopCatIds.append(i + ",");
    }
    allTopCatIds.deleteCharAt(allTopCatIds.length() - 1);

    final String query = "SELECT category._id, " +
            "categorylang.Title, categorylang.Description, category.Position" +
            " FROM category" +
            " INNER JOIN categorylang" +
            " ON category._id = categorylang.CategoryID" +
            " WHERE category.ParentID = 0  AND category._id IN (" + allTopCatIds.toString() +
            ") ORDER BY category.Position DESC";
    this.cursor = this.db.rawQuery(query, null);

    SqlHelper.topCatList = new TreeSet<Category>();
    SqlHelper.catMapping = new HashMap<Integer, Set<Category>>();
    if (this.cursor.moveToFirst()) {
        do {
            SqlHelper.topCatList.add(new Category(this.cursor.getInt(0), this.cursor
                    .getString(1), "", this.cursor
                    .getString(2), this.cursor.getInt(3)));
            SqlHelper.catMapping.put(this.cursor.getInt(0), null);
        } while (this.cursor.moveToNext());
    }

    this.cursor.close();
    return SqlHelper.topCatList;
}

我的意思是：this.cursor.getInt(0)，this.cursor.getString(1) 将在另一个类中使用所以我将在另一个活动中显示顶级类别列表