Android : how to get position data of listview in android

i m new on android i have displayed jsonarray in listview working well i implemented onitemclick of Listview... item click is Performing ..But When I want get postion data from array list

i tried Like This But Could not Get Any Data from array list

here is my code

listview.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {

                    /// UNABLE TO GET DATA FROM ARRAY LIST
                RequesterId=String.valueOf(arraylist.get(position).get("user_id"));
                      final CharSequence[]items = {"Add as Friend", "Cancel", "View Profile"};

                        AlertDialog.Builder builder = new AlertDialog.Builder(new ContextThemeWrapper(getActivity(), R.style.AlertDialogCustom));
                        //Set its title

                       /* builder.setTitle("Request Confirmation");*/
                        //Set the list items and assign with the click listener
                        builder.setItems(items, new DialogInterface.OnClickListener() {
                            // Click listener
                            public void onClick(DialogInterface dialog, int item) {

                                switch(item){
                                   case 0:// first item in your LIST
                                       Toast.makeText(getActivity(), "Add as Friend", Toast.LENGTH_SHORT).show();
                                      // new Acceptaccess().execute();
                                   break; 
                                   case 1:// second item in your LIST
                                       Toast.makeText(getActivity(), "Cancel", Toast.LENGTH_SHORT).show();
                                      // new CancelRequest().execute();
                                   break; 
                                   case 2:// third item in your LIST
                                       new userbyid().execute();
                                       Toast.makeText(getActivity(), "View Profile", Toast.LENGTH_SHORT).show();
                                   break; 

                                }

                            }
                        });
                        AlertDialog alert = builder.create();
                        //display dialog box
                        alert.show();



                }
            });