MultipleChoice checkboxes alertDialogue in android

here is my code which i use for multiple selection.

String[] items = new String[education_list.size()];
                        items = education_list.toArray(items);
                        //final CharSequence[] items = (CharSequence[]) education_list.toArray();
                        final ArrayList seletedItems=new ArrayList();

                        AlertDialog.Builder builder = new AlertDialog.Builder(Activity_EditProfile.this);
                        builder.setTitle("Select Education");
                        builder.setMultiChoiceItems(items, null,
                                new DialogInterface.OnMultiChoiceClickListener() {
                         // indexSelected contains the index of item (of which checkbox checked)
                         @Override
                         public void onClick(DialogInterface dialog, int indexSelected,
                                 boolean isChecked) {
                             if (isChecked) {
                                 // If the user checked the item, add it to the selected items
                                 // write your code when user checked the checkbox 
                                 seletedItems.add(indexSelected);
                             } else if (seletedItems.contains(indexSelected)) {
                                 // Else, if the item is already in the array, remove it 
                                 // write your code when user Uchecked the checkbox 
                                 seletedItems.remove(Integer.valueOf(indexSelected));
                             }
                         }
                     })
                      // Set the action buttons
                     .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                         @Override
                         public void onClick(DialogInterface dialog, int id) {
                             //  Your code when user clicked on OK
                             //  You can write the code  to save the selected item here
                            System.out.println(seletedItems.toString());

                         }
                     })
                     .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                         @Override
                         public void onClick(DialogInterface dialog, int id) {
                            //  Your code when user clicked on Cancel

                         }
                     });

                        dialog = builder.create();//AlertDialog dialog; create like this outside onClick
                        dialog.show();
                    }

Now my education list fills dynamically as per response from webservice. The selectedItem arraylist get filled with indexes. I want checked items names. How can i achieve this??