Deleting and Updating values from a cusrsor adapter

I am new to android development and I have populated values to a listview using a cursor adapter. I am trying to Delete and update the values using the list view but I am not sure how this is done using a cursor adapter. Nor I am able to click on the list view item

The below methods I have used in my database handler class to delete and update values

Delete Method

 public void DeletingCustodian(Custodians custodians)
    {
        SQLiteDatabase db_database = getWritableDatabase();
        //Deleting the custodian from the Database where the custodian ID matches to the selcted ID
        db_database.delete(TABLE_CUSTODIAN,CUSTODIAN_ID + "=?" , new String[]{String.valueOf(custodians.getCust_id())});
        db_database.close();
    }

Updating Method

public  int updateCustodian(Custodians cust)
    {
        SQLiteDatabase db_database = getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(CUSTODIAN_NAME,cust.getCust_Name());
        values.put(CUSTODIAN_DESIGNATION,cust.getCust_Design());
        values.put(CUSTODIAN_DEPARTMENT,cust.getDepartment());

        int roweffected = db_database.update(TABLE_CUSTODIAN,values,CUSTODIAN_ID + "=?", new String[]{String.valueOf(cust.getCust_id())});
        db_database.close();
        return roweffected;
    }

I have created a context Menu which displays edit and delete this is shown when a certain item is selected.

 public void onCreateContxtManu(ContextMenu menu,View view, ContextMenu.ContextMenuInfo menuInfo)
    {
        super.onCreateContextMenu(menu,view,menuInfo);

        menu.setHeaderTitle("Custodian Options");
        menu.add(Menu.NONE,EDIT,menu.NONE,"Edit Custodian");
        menu.add(Menu.NONE,DELETE,menu.NONE,"Delete Custodian");
    }

 public void deletingitemsfromlist()
    {
        CustodianListview.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

                return false;
            }
        });

    }
   public boolean onContextItemSelected(MenuItem item)
    {
        switch(item.getItemId())
        {
            case EDIT:


                break;
            case DELETE:


                break;
        }

        return false;
    }