ListView Klick Daten auslesen

protected void onPostExecute(JSONObject json) {
            osList.clear();
            try {
                items = json.getJSONArray(TAG_ITEMS);
                for (int i = 0; i < items.length(); i++) {
                    JSONObject c = items.getJSONObject(i);
                    final String betreff = c.getString(TAG_BETREFF);
                    String beschreibung = c.getString(TAG_BESCHREIBUNG);
                    String datum = c.getString(TAG_DATUM);


                    HashMap < String, String > map = new HashMap<String, String>();
                    
                    map.put(TAG_BETREFF,betreff);
                    map.put(TAG_BESCHREIBUNG,beschreibung);
                    map.put(TAG_DATUM,datum);
                    osList.add(map);
                    list = (ListView)findViewById(R.id.listView);
                    final ListAdapter adapter = new SimpleAdapter(MyActivity.this,
                            osList,
                            R.layout.list_item,
                            new String[] {TAG_BETREFF, TAG_BESCHREIBUNG, TAG_DATUM},
                            new int[] {R.id.filename, R.id.tvBeschreibung, R.id.tvDatum} );

                    list.setAdapter(adapter);


                    }

     list.setAdapter(adapter);

                    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> parent, View view, int position,
                                                long id) {
                            Toast.makeText(getApplicationContext(), TAG_BESCHREIBUNG,
                                    Toast.LENGTH_SHORT).show();


                        }


                    });

 list.setAdapter(adapter);

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


                            String o = list.getAdapter().getItem(position).toString();

                            Toast.makeText(getApplicationContext(), o,
                                    Toast.LENGTH_SHORT).show();


                        }


                    });