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POCall AsyncTask in a Fragment
 

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  1. POCall AsyncTask in a Fragment
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    <p>I have a class that extends a Fragment. I would call my AsyncTask class in the Fragment. I doesn't obtain any error in mylogcat but I doesn't display null in my listview. Below paste the code that I use, the code is more simple, read a json file and insert its in a custom listview. This code works if change the class in Activity, but i want transform my Activity in a Fragment. </p> <p>Thanks in advance.</p> <pre><code> public class MyFragment extends Fragment { JSONParser jsonParser = new JSONParser(); ArrayList&lt;HashMap&lt;String, String&gt;&gt; uniList; JSONArray articles = null; ListView list; ListUniAdapter adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); new LoadNews().execute(); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { LinearLayout ll = (LinearLayout)inflater.inflate(R.layout.uni_list, container, false); list = (ListView) ll.findViewById(android.R.id.list); return ll; } class LoadNews extends AsyncTask&lt;String, String, String&gt; { @Override protected void onPreExecute() { super.onPreExecute(); } protected String doInBackground(String... args) { List&lt;NameValuePair&gt; params = new ArrayList&lt;NameValuePair&gt;(); params.add(new BasicNameValuePair("s", "s")); String json = jsonParser.makeHttpRequest(Variable.URL_UNIVERSITOMETRO, "GET", params); try { uniList = new ArrayList&lt;HashMap&lt;String, String&gt;&gt;(); articles = new JSONArray(json); if (articles != null) { for (int i = 0; i &lt; articles.length(); i++) { JSONObject c = articles.getJSONObject(i); String title = c.getString(Variable.UNI_NAME); String voto = c.getString(Variable.UNI_VOTO); HashMap&lt;String, String&gt; map = new HashMap&lt;String, String&gt;(); map.put(Variable.UNI_NAME, title); map.put(Variable.UNI_VOTO, voto); uniList.add(map); if (isCancelled()) break; } } else { Log.d("articles: ", "null"); } } catch (JSONException e) { e.printStackTrace(); } return null; } protected void onPostExecute(String file_url) { list.setScrollingCacheEnabled(false); adapter = new ListUniAdapter(getActivity(), uniList); list.setAdapter(adapter); list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView&lt;?&gt; arg0, View view, int arg2, long arg3) { } }); } } </code></pre> <p>}</p>
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    1. USdavideagostini
    1. USdavideagostini
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      1. POCall AsyncTask in a Fragment
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      1. VTUpMod
    1. COcan you elaborate this "I don't obtain any error but doesn't display null."
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      1. POCall AsyncTask in a Fragment
      1. USRaghunandan
    2. COI doesn't obtain any error in my logcat but I doesn't display null in my listview.
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      1. POCall AsyncTask in a Fragment
      1. USdavideagostini
    3. CODoesn't display null? What does it display? Also, creating a new map for every instance and only adding 2 items to it seems horribly inefficient to me. Why not create a instance of a data class instead?
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      1. USddmps
 

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