Question

我正在检查，以便将我最喜欢的Promotions对象放入数组中。我尝试这样做（来自我的PromotionsBDD类，它控制我的SQLite数据库中的表格促销）：

public ArrayList<Promotion> getListPromotionsFavorites()
    {
        String[] columns = new String[] {"ID", "RATING", "TITLE", "COMPANY_ID","AVAILABLEDATE", "DESCRIPTION", "SETONFAVORITE"};

        Cursor objCursor = bdd.query(TABLE_PROMOTIONS, columns,"SETONFAVORITE = ?",new String[]{"true"},null,null,null,null);

        int id = objCursor.getColumnIndex("ID");
        int rating = objCursor.getColumnIndex("RATING");
        int title = objCursor.getColumnIndex("TITLE");
        int companyid = objCursor.getColumnIndex("COMPANY_ID");
        int availabledate = objCursor.getColumnIndex("AVAILABLEDATE");
        int description = objCursor.getColumnIndex("DESCRIPTION");
        int setonfavorite = objCursor.getColumnIndex("SETONFAVORITE");

        ArrayList<Promotion> promoFavoriteArray = new ArrayList<Promotion>();
        objCursor.moveToFirst();// position sur la première ligne

        if (objCursor != null) 
        {
            if (objCursor.isFirst())
            {
                do 
                {
                    String resultid = objCursor.getString(id);
                    String resultrating = objCursor.getString(rating);
                    String resultitle = objCursor.getString(title);
                    int resultcompanyid = objCursor.getInt(companyid);
                    String resultavailbledate = objCursor.getString(availabledate);
                    String resultdescription = objCursor.getString(description);
                    String resultsetonfavorite = objCursor.getString(setonfavorite);

                    Promotion promo = new Promotion(resultid, resultrating, resultitle, resultcompanyid,resultavailbledate,resultdescription, resultsetonfavorite);
                    promoFavoriteArray.add(promo);
                    objCursor.moveToNext();//positionnement sur le suivant
                }
                while(objCursor.isLast());
            }
        }
        objCursor.deactivate();
        objCursor.close();
    return promoFavoriteArray;
}

使用1或2个条目为我的promoFavoriteArray工作正常，但是我把3个条目放到这个数组中，它返回一个1到3的数组..

编辑：我试过这个：

ArrayList<Promotion> promoFavoriteArray = new ArrayList<Promotion>();
            objCursor.moveToFirst();
            if(objCursor != null)
            {
                do 
                {
                        String resultid = objCursor.getString(id);
                        String resultrating = objCursor.getString(rating);
                        String resultitle = objCursor.getString(title);
                        int resultcompanyid = objCursor.getInt(companyid);
                        String resultavailbledate = objCursor.getString(availabledate);
                        String resultdescription = objCursor.getString(description);
                        String resultsetonfavorite = objCursor.getString(setonfavorite);

                        Promotion promo = new Promotion(resultid, resultrating, resultitle, resultcompanyid,resultavailbledate,resultdescription, resultsetonfavorite);
                        promoFavoriteArray.add(promo);
                        objCursor.moveToNext();//positionnement sur le suivant
                }
                while(!objCursor.isLast());
            }
        objCursor.deactivate();
        objCursor.close();
        return promoFavoriteArray;

但我得到了CursorIndexOutOfBoundException ..

Answer 1

你正在做（伪代码）：

first
        add(current)
        next
    repeat if last

如果有2个项目，在您添加之后，接下来使其成为索引2，则循环并再次添加。你有两件事，很棒。

如果您添加一次的3个项目，它不会持续，所以它不会再次循环。你最终得到了一个。

相反，尝试类似的事情（你不需要isFirst检查，而你需要不最后）：

if (objCursor == null)
    return array; // empty

objCursor.moveToFirst();
do
{
    // read data
    array.Add(promo);

} while (!objCursor.isLast())

Answer 2

以下是执行此操作的方法：

ArrayList<Promotion> promoFavoriteArray = new ArrayList<Promotion>();
        boolean hasMore = objCursor.moveToFirst();

        while(hasMore)
        {
                String resultid = objCursor.getString(id);
                String resultrating = objCursor.getString(rating);
                String resultitle = objCursor.getString(title);
                int resultcompanyid = objCursor.getInt(companyid);
                String resultavailbledate = objCursor.getString(availabledate);
                String resultdescription = objCursor.getString(description);
                String resultsetonfavorite = objCursor.getString(setonfavorite);

                Promotion promo = new Promotion(resultid, resultrating, resultitle, resultcompanyid,resultavailbledate,
                        resultdescription, resultsetonfavorite);
                promoFavoriteArray.add(promo);
                hasMore = objCursor.moveToNext();
        }
    objCursor.deactivate();
    objCursor.close();
    return promoFavoriteArray;

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2 个答案: