android - Android:SQLite，cursor.moveToNext()始终返回false

以下语句cursor.moveToNext()始终为false。我希望循环执行一次。我已经测试过查询实际上返回数据。
有人知道怎么回事吗？

    String query ="SELECT(SELECT COUNT(*) FROM Table1) as count1, (SELECT COUNT(*) FROM Table2) as count2;";

    Cursor mCursor = mDb.rawQuery(query, null);

    if (mCursor != null) {
        mCursor.moveToFirst();
    }

    while (cursor.moveToNext()) {   //<---------------return false here???
        String result_0=cursor.getString(0);
    }

最佳答案

我知道你已经解决了你的问题，但下面是一个演练：

Cursor mCursor = mDb.rawQuery(query, null);

// At this point mCursor is positioned at just before the first record.

if (mCursor != null) {
    mCursor.moveToFirst();
    // mCursor is now pointing at the first (and only) record
}

while (mCursor.moveToNext()) {
    String result_0=cursor.getString(0);
}

// The loop above was skipped because `.moveToNext()` caused mCursor
// to move past the last record.

因此，在只需要一个记录的情况下，您只需要mCursor.moveToFirst()或mCursor.moveToNext()。

关于android - Android:SQLite，cursor.moveToNext()始终返回false，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/15260598/