问如何将SQLite数据库中的值与从电话中读取的值进行比较，并只保存新值？

EN

public int checkContacts(String name, String number) {  // name and number are read from phone
    String query = "select name,number from contacts";
    cur = db1.rawQuery(query, null);  // cur is object of Cursor
    while(cur.moveToNext())
    {
        array.add(cur.getString(1));  // array is object of ArrayList<String>
        if( !(number.equals(array)))
        {
            insertContacts(name, number);  // function to insert to database
            count++;   // count is used to get the number of contacts saved
        }
    }
    return count;
}