数据库方法第一次工作正常，然后没有

Question

我对此代码有疑问;

    m_ProgressDialog = ProgressDialog.show(Main.this, "Please wait...",
            "Writing Grid Data...", true);
    new Thread() {
        public void run() {

            try {
                Integer count = 1;
                Integer data = 0;
                SQLiteDatabase db = events.getWritableDatabase();
                ContentValues values = new ContentValues();
                Cursor cursor = db.query(TABLE_NAME, FROM, null, null,
                        null, null, null);
                while (count <= pickedcount) {
                    startManagingCursor(cursor);
                    if (pick[count] != 0) {
                        if (pick[count] == 80) {
                            cursor.moveToLast();
                            data = (cursor.getInt(1) + 1);
                            values.put(num, data);
                        } else {
                            cursor.moveToPosition(pick[count]);
                            data = (cursor.getInt(1) + 1);
                            values.put(num, data);
                            Log.e("count ", "count = " + count.toString());
                            Log.e("Position ",
                                    "Pos = " + cursor.getPosition());
                            Log.e("pick ", "pick = " + picked[count]
                                    + " + " + data.toString() + " cursor "
                                    + cursor.getString(1));
                        }
                        data = 0;
                    }
                    db.update(TABLE_NAME, values,
                            _ID + " = " + pick[count], null);
                    values.clear();
                    count++;
                }
            } catch (Exception e) {
                Log.e("tag", e.getMessage());
            }
            // dismiss the progressdialog
            m_ProgressDialog.dismiss();
        }
    }.start();
    Intent i = new Intent(Main.this, Main.class);
    startActivity(i);
}

数据库是80行乘2列。第一列是_id，第二列是_id被记录的次数。 pick [array]保存需要记录的数字1-80，因此while循环应该移动到位置（1-80）拉出当前数字并简单地加1。

此方法在您第一次输入数据时效果很好，第二次此方法从数据库中为最后一个数字提取0。

以下是来自logcat的那些日志的输出。第一次选择数字1 - 5

count = 1
Pos = 1
pick = 1 + 1 cursor 0
count = 2
Pos = 2
pick = 2 + 1 cursor 0
count = 3
Pos = 3
pick = 3 + 1 cursor 0
count = 4
Pos = 4
pick = 4 + 1 cursor 0
count = 5
Pos = 5
pick = 5 + 1 cursor 0

并且第二次选择相同的数字:(上一次运行在数据库中成功记录1 - 5与1s）

count = 1
Pos = 1
pick = 1 + 2 cursor 1
count = 2
Pos = 2
pick = 2 + 2 cursor 1
count = 3
Pos = 3
pick = 3 + 2 cursor 1
count = 4
Pos = 4
pick = 4 + 2 cursor 1
count = 5
Pos = 5
pick = 5 + 1 cursor 0 //<----------

（注意所选数字5的输出）