android - Only get 1st element of TABLE in SQLite -

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i have code: 

public linkedlist<product> getallproduct(string idtask){     linkedlist<product> products = new linkedlist<product>();     cursor localcursor = this.getwritabledatabase().rawquery("select * "+table_product+" "+key_id_product_task+"='"+idtask+"'", null);     product product;     if (localcursor.movetofirst())         {             product = new product();             product.setkey_id_unique_product(localcursor.getstring(0));             product.setkey_id_product_task(localcursor.getstring(1));             product.setkey_id_product(localcursor.getstring(2));             product.setkey_name_product(localcursor.getstring(3));             product.setkey_qty_product(localcursor.getstring(4));             product.setkey_size_product(localcursor.getstring(5));             products.add(product);         } while (localcursor.movetonext());     return products; }

i 1 row, when particular idtasks, have 2 elements. please me, don't know whats problem. because, when debugging add 2 products idtask in table product, when try these products idtask, first.

here code add products int table product

public void addproduct(product product) {            sqlitedatabase localsqlitedatabase = getwritabledatabase();         contentvalues localcontentvalues = new contentvalues();          if (!isexistidproduct(product.getkey_id_product())){             localcontentvalues.put(key_id_product_task, product.getkey_id_product_task());             localcontentvalues.put(key_id_product, product.getkey_id_product());             localcontentvalues.put(key_name_product, product.getkey_name_product());             localcontentvalues.put(key_qty_product, product.getkey_qty_product());             localcontentvalues.put(key_size_product, product.getkey_size_product());             localsqlitedatabase.insert(table_product, null, localcontentvalues);                 } }

if using test data reuses same product ids, following test preventing adding second row:

if (!isexistidproduct(product.getkey_id_product()))

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