Question

我的inv.db有以下内容

从库存中选择*;

Failed to read row 0, column -1 from a CursorWindow which has 2 rows, 3 columns.
Couldn't read row 0, col -1 from CursorWindow.  Make sure the Cursor is initialized correctly before accessing data from it.

然而我收到错误

// Find the columns of pet attributes that we're interested in
        int nameColumnIndex = cursor.getColumnIndex(InventoryContract.InventoryEntry.COLUMN_PRO_NAME);
        int priceColumnIndex = cursor.getColumnIndex(InventoryContract.InventoryEntry.COLUMN_PRO_PRICE);
        int quanColumnIndex = cursor.getColumnIndex(InventoryContract.InventoryEntry.COLUMN_PRO_QUAN);
        int supColumnIndex = cursor.getColumnIndex(InventoryContract.InventoryEntry.COLUMN_PRO_SUP);


        // Read the pet attributes from the Cursor for the current pet
        String petName = cursor.getString(nameColumnIndex);
        String price = cursor.getString(priceColumnIndex);
        String quantity = cursor.getString(quanColumnIndex); // produces error

但是除了id之外还有四列。

"scripts": {
    ...
    "pree2e": "webdriver-manager update --standalone false --gecko false",
    "e2e": "protractor"
  }

我不确定这里有什么问题。如果我删除最后一行代码，我的代码就会运行

Answer 1

您的光标已正确初始化，但无法在InventoryContract.InventoryEntry.COLUMN_PRO_QUAN找到字符串的列索引

确保存储在那里的字符串与列名相匹配。现在它可能不正确

如何修复android中的Cursor初始化错误？

1 个答案: