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POListFragment with Asynctask and Custom Adapter
 

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  1. POListFragment with Asynctask and Custom Adapter
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    <p>My problem is very basic, however I can't see the solution to it. That's my 3rd project on Android. So far I was using fragments with a ListView declared in it, <code>onCreateView</code> where I was inflating my ListView and <code>onActivityCreated</code> to initialize the layout. Now I want to do the same but using ListFragment.</p> <p>I was using this exmaple as reference: <a href="http://developer.android.com/training/basics/fragments/creating.html" rel="nofollow">http://developer.android.com/training/basics/fragments/creating.html</a></p> <p>Below is modified code that I used for Fragment with a ListView. I have changed this to work with a ListFragment but without success. Can someone help me out? Thank you in advance. </p> <pre><code> public class PlayersListFragment extends ListFragment { OnPlayerSelectedListener mCallback; // URL to make request private static String URL = Utils.URL; private static int userID; ArrayList&lt;HashMap&lt;String, Object&gt;&gt; playersList; ListView playerView; private Dialog pDialog; // The container Activity must implement this interface so the frag can // deliver messages public interface OnPlayerSelectedListener { /** Called by HeadlinesFragment when a list item is selected */ public void onPlayerSelected(int position); } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // We need to use a different list item layout for devices older than // Honeycomb int layout = Build.VERSION.SDK_INT &gt;= Build.VERSION_CODES.HONEYCOMB ? android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1; // Create an array adapter for the list view, using the Ipsum headlines // array setRetainInstance(true); new PlayersLoadTask().execute(); } @Override public void onActivityCreated(Bundle savedInstanceState) { super.onCreate(savedInstanceState); initLayout(); } public boolean onOptionsItemSelected(MenuItem item) { return false; } private void initLayout() { if(getActivity().getIntent()!=null) { userID = getActivity().getIntent().getIntExtra("id", 0); } else { return; } playerView = (ListView) getActivity().findViewById(R.id.list); playersList = new ArrayList&lt;HashMap&lt;String, Object&gt;&gt;(); int[] colors = {0, 0xFFFF0000, 0}; // red for the example } @Override public void onStart() { super.onStart(); // When in two-pane layout, set the listview to highlight the selected // list item // (We do this during onStart because at the point the listview is // available.) if (getFragmentManager().findFragmentById(R.id.playerDetailFragment) != null) { getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); // This makes sure that the container activity has implemented // the callback interface. If not, it throws an exception. try { mCallback = (OnPlayerSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnPlayerSelectedListener"); } } @Override public void onListItemClick(ListView l, View v, int position, long id) { // Notify the parent activity of selected item mCallback.onPlayerSelected(position); // Set the item as checked to be highlighted when in two-pane layout getListView().setItemChecked(position, true); } class PlayersLoadTask extends AsyncTask&lt;String, String, String&gt; { @Override protected void onPreExecute() { pDialog = ProgressDialog.show(getActivity(), "", "Loading. Please wait...", true); } @Override protected String doInBackground(String... params) { try { ArrayList&lt;BasicNameValuePair&gt; parameters = new ArrayList&lt;BasicNameValuePair&gt;(); parameters.add(new BasicNameValuePair("request", "getPlayers")); parameters.add(new BasicNameValuePair("clubid", Integer .toString(userID))); DefaultHttpClient httpClient = new DefaultHttpClient(); HttpPost httpPost = new HttpPost(URL); httpPost.setEntity(new UrlEncodedFormEntity(parameters, ("ISO-8859-1"))); HttpResponse httpResponse = httpClient.execute(httpPost); HttpEntity httpEntity = httpResponse.getEntity(); // if this is null the web service returned an empty page if (httpEntity == null) // response is empty so exit out return null; String jsonString = EntityUtils.toString(httpEntity); if (jsonString != null &amp;&amp; jsonString.length() != 0) { JSONArray jsonArray = new JSONArray(jsonString); for (int i = 0; i &lt; jsonArray.length(); i++) { HashMap&lt;String, Object&gt; map = new HashMap&lt;String, Object&gt;(); JSONObject jsonObject = (JSONObject) jsonArray.get(i); int id = jsonObject.getInt("id"); String name = jsonObject.getString("name"); map.put("id", id); map.put("name", name); playersList.add(map); } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } catch (Exception e) { Log.e("ERROR SOMEWHERE!!!! ", e.toString()); } return null; } @Override protected void onPostExecute(String file_url) { if (pDialog.isShowing()) pDialog.dismiss(); if (playersList.size() == 0) { Toast.makeText(getActivity(), "No players in a list", Toast.LENGTH_SHORT).show(); } else { playerView.setAdapter(new PlayerListAdapter( // &lt;&lt;== EXCEPTION HERE getActivity(), R.id.player_list_id, playersList)); } } } } </code></pre> <p>And off course a stacktrace from a LogCat which points on this line : <code>playerView.setAdapter(new PlayerListAdapter(</code> </p> <pre><code> 12-18 11:34:30.181: E/AndroidRuntime(16436): FATAL EXCEPTION: main 12-18 11:34:30.181: E/AndroidRuntime(16436): java.lang.NullPointerException 12-18 11:34:30.181: E/AndroidRuntime(16436): at com.statsports.statisticalandroid.PlayersListFragment$PlayersLoadTask.onPostExecute(PlayersListFragment.java:199) 12-18 11:34:30.181: E/AndroidRuntime(16436): at com.statsports.statisticalandroid.PlayersListFragment$PlayersLoadTask.onPostExecute(PlayersListFragment.java:1) 12-18 11:34:30.181: E/AndroidRuntime(16436): at android.os.AsyncTask.finish(AsyncTask.java:631) 12-18 11:34:30.181: E/AndroidRuntime(16436): at android.os.AsyncTask.access$600(AsyncTask.java:177) 12-18 11:34:30.181: E/AndroidRuntime(16436): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644) 12-18 11:34:30.181: E/AndroidRuntime(16436): at android.os.Handler.dispatchMessage(Handler.java:99) 12-18 11:34:30.181: E/AndroidRuntime(16436): at android.os.Looper.loop(Looper.java:137) 12-18 11:34:30.181: E/AndroidRuntime(16436): at android.app.ActivityThread.main(ActivityThread.java:5103) 12-18 11:34:30.181: E/AndroidRuntime(16436): at java.lang.reflect.Method.invokeNative(Native Method) 12-18 11:34:30.181: E/AndroidRuntime(16436): at java.lang.reflect.Method.invoke(Method.java:525) 12-18 11:34:30.181: E/AndroidRuntime(16436): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 12-18 11:34:30.181: E/AndroidRuntime(16436): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 12-18 11:34:30.181: E/AndroidRuntime(16436): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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