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背景 - 我正在尝试检索按州过滤的拍卖列表。我正在尝试检索拍卖日期和拍卖名称。

我从列表视图中获取状态名称 - 状态值被正确传递（我已经注释掉了构建状态列表的函数名称并使用 Toast 来验证一个好的值）

我的问题发生在 fillAuctionsList(String editAuctionState);

public void fillAuctionsList(String editAuctionState){
    //sql Query - editAuctionState is the State selected

    SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
    //set the table to the Auction
    queryBuilder.setTables(Auctions.AUCTIONS_TABLE_NAME);

    // build the return columns for my listview
    String asColumnsToReturn[]= {
            Auctions.AUCTIONS_TABLE_NAME + "." + Auctions.AUCTIONS_AUCTION_NAME,
            Auctions.AUCTIONS_TABLE_NAME + "." + Auctions.AUCTIONS_DATE,
            Auctions.AUCTIONS_TABLE_NAME + "." + Auctions.AUCTIONS_STATE,
            Auctions.AUCTIONS_TABLE_NAME + "." + Auctions._ID}; 
    //end of build columns to return

    //build the where statement based on the Auction State
    String howToFilter[]={editAuctionState};

    //build the cursor

    mCursor = queryBuilder.query(mDB, asColumnsToReturn, Auctions.AUCTIONS_STATE + "=?", howToFilter,null, null, null);

    //manage the cursor
    startManagingCursor(mCursor);

    int HowManyRecords = mCursor.getCount();
    if(HowManyRecords==0){
        Toast.makeText(getApplicationContext(),"No Records Found",Toast.LENGTH_LONG).show();
        finish();
    }

在此之后更多的光标代码。

我在 querybuilder 语句中收到 Null Pointer Exception 错误 - 应用程序似乎永远不会获取代码以计算记录数。

任何建议表示赞赏。谢谢

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1 回答 1

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问题解决了....

我有一个“duh”的时刻，并没有费心去实际打开数据库。

于 2013-07-04T15:35:58.083 回答