Question

i have a gridview, when an item is clicked. it will iterate through a list and it should remove an object from the list when it matches a string. here’s my code so far but it doesn’t work. i don’t know what is wrong. pls help.

gridView.setOnItemClickListener(new OnItemClickListener() {

    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) 
    {
         String sel_id = list2.get(arg2).stud_id.toString();

         for(int i=0; i<late_list.size(); i++)
         {
             if(late_list.get(i).stud_id.toString() == sel_id.toString())
             {
                 late_list.remove(i);
             }
         }
     }

});

Answer 1

Don’t compare String with ==, use equals()

== checks if the operands reference the same object instance (only checks the same value for primitive types)

equals() checks for same object contents (for classes that override the equals method, and String certainly does).

Consequently your if condition must be

if (late_list.get(i).stud_id.toString().equals(sel_id))

Also, there is no need to call toString() on a String object, as you did on sel_id

If your stud_id is a String also, you can write

if (late_list.get(i).stud_id.equals(sel_id))