Android sqlite: how to retrieve specific data from particular column?

Question

I am developing restaurant menu application. My app has a sqlite table which has these columns:

\"id\", \"category\", \"item_name\"

Content

Answer 1

public List getAllData(String email)
{
    db = this.getReadableDatabase();
    String[] projection = {email};

    List list = new ArrayList<>();

   Cursor cursor = db.query(Table_name,null,"email=?",projection,null,null,null,null);

  //  cursor.moveToFirst();

    if(cursor.moveToFirst()) {
        do {

            list.add(cursor.getString(cursor.getColumnIndex("id")));
            list.add(cursor.getString(cursor.getColumnIndex("name")));
            list.add(cursor.getString(cursor.getColumnIndex("email")));
            list.add(cursor.getString(cursor.getColumnIndex("password")));
           // cursor.moveToNext();

        } while (cursor.moveToNext());
    }
    return list;
}