Question

All
I want logical help. I have 100 row in database and get all rows random ally without duplication I have used below code.

public ArrayList<Rows> getRows(){
    ArrayList<Rows> myRaw=new ArrayList<Rows>();
    Cursor rawCursor=this.db.query(DB_TABLE, null, null, null, null, null, null);
    if(rawCursor.getCount()>0){
        Random rng = new Random();
        rawCursor.moveToFirst();
        do {

             // Ideally just create one instance globally
            ArrayList<Rows> generated = new ArrayList<Raws>();
            for (int i = 0; i < 371; i++)
            {
                while(true)
                {
                    Integer next = rng.nextInt(371) + 1;
                    rawCursor.moveToPosition(next);
                    Rows raw=new Raws(rawCursor.getInt(rawCursor.getColumnIndex("_id")),rawCursor.getString(rawCursor.getColumnIndex("raw")),rawCursor.getInt(rawCursor.getColumnIndex("fav")));
                    if (!generated.contains(raw))
                    {
                        // Done for this iteration
                        generated.add(raw);
                        break;
                    }
                }
            }

            myRaw=generated;

        } while (rawCursor.moveToNext());
        rawCursor.close();
    }
    return myRaw;
}

Thanks All

Answer 1

You can tell the database to order the records by some random number:

cursor = db.query(DB_TABLE, null, null, null, null, null, "random()");