How to get SQLite one column data to plain int?

SQLite whole column with numbers convert to plain int, because I want to perform a calculation.

I get a whole of data from one column by convert data to ArrayList<String> and is there any simpler way to do this instead steps: ArrayList<String> -> ArrayList<int> -> int?

public ArrayList<String> GetAllValues(String aTable,String[] aColumn)
{
    SQLiteDatabase db = this.getWritableDatabase();
    ArrayList<String> list = new ArrayList<String>();
    Cursor cursor = db.query(aTable, aColumn, null, null, null, null, null);
    if (cursor.moveToFirst())
    {
        do
        {
            list.add(cursor.getString(0));
        }
        while (cursor.moveToNext());
    }
    if (cursor != null && !cursor.isClosed())
    {
        cursor.close();
    }

    return list;
}