Android CursorIndexOutOfBoundsException 请求索引 0，大小为 0答案

【问题标题】：Android CursorIndexOutOfBoundsException Index 0 requested, with a size of 0Android CursorIndexOutOfBoundsException 请求索引 0，大小为 0
【发布时间】：2013-01-10 18:11:10
【问题描述】：

我正在尝试在我的 Activity 中使用 2 个不同的 ListView 来填充数据库内容 onCreate。自从我添加代码以来，我现在都因标题中提到的错误而受到逼迫。

我不知道为什么会这样。

代码如下：

    currentList = (ListView)findViewById(R.id.list_current_day);
    cursor = datasource.fetchCurrentLogs(dayExerciseDataID);
    to = new int[] { R.id.listitem_log_reps, R.id.listitem_log_weight };
    dataAdapterCurrent = new SimpleCursorAdapter(this, R.layout.listitem_log, cursor, columns, to, 0);
    currentList.setAdapter(dataAdapterCurrent);

    previousList = (ListView)findViewById(R.id.list_previous_day);
    cursor = datasource.fetchPreviousLogs(dayExerciseDataID);
    to = new int[] { R.id.listitem_log_reps, R.id.listitem_log_weight };
    dataAdapterPrevious = new SimpleCursorAdapter(this, R.layout.listitem_log, cursor, columns, to, 0);
    previousList.setAdapter(dataAdapterPrevious);

这是数据库的结构和功能：

public Cursor fetchCurrentLogs(long dayExerciseDataID) {
    // where day = today
    Cursor cursor = database.rawQuery("select " + MySQLiteHelper.COLUMN_ID + "," + MySQLiteHelper.COLUMN_REPS + ", " + MySQLiteHelper.COLUMN_WEIGHT + " " +
            "from " + MySQLiteHelper.TABLE_LOGS + " " +
            "where " + MySQLiteHelper.COLUMN_ID_DAY_EXERCISE + " = '" + dayExerciseDataID + "'", null);
    if (cursor != null) { cursor.moveToFirst(); }
    return cursor;
}

public Cursor fetchPreviousLogs(long dayExerciseDataID) {
    // where day = closest day from today
    Cursor cursor = database.rawQuery("select " + MySQLiteHelper.COLUMN_ID + "," + MySQLiteHelper.COLUMN_REPS + ", " + MySQLiteHelper.COLUMN_WEIGHT + " " +
            "from " + MySQLiteHelper.TABLE_LOGS + " " +
            "where " + MySQLiteHelper.COLUMN_ID_DAY_EXERCISE + " = '" + dayExerciseDataID + "'", null);
    if (cursor != null) { cursor.moveToFirst(); }
    return cursor;
}

    database.execSQL("create table " + TABLE_LOGS + " (" 
            + COLUMN_ID + " integer primary key autoincrement," 
            + COLUMN_ID_DAY_EXERCISE + " integer not null,"
            + COLUMN_REPS + " integer not null,"
            + COLUMN_WEIGHT + " real not null,"
            + COLUMN_1RM + " real not null,"
            + COLUMN_DATE + " integer not null"
            + ")");

有人能解释一下为什么会这样吗？如果我错过了任何重要的代码，请告诉我，我会更新问题。

【问题讨论】：

标签： android indexing cursor indexoutofboundsexception

【解决方案1】：

你必须以这种方式使用 SimpleCursorAdapter

dataAdapterPrevious = new SimpleCursorAdapter(this, R.layout.listitem_log, cursor, columns, to);

而不是这个

 dataAdapterPrevious = new SimpleCursorAdapter(this, R.layout.listitem_log, cursor, columns, to, 0);

【讨论】：

不，that constructor 已弃用，只能在 API 10 及更低版本上使用。

【解决方案2】：

尝试为两个列表使用不同的cursor 实例。

currentList = (ListView)findViewById(R.id.list_current_day);
cursor1 = datasource.fetchCurrentLogs(dayExerciseDataID);

和

previousList = (ListView)findViewById(R.id.list_previous_day);
cursor2 = datasource.fetchPreviousLogs(dayExerciseDataID);

【讨论】：