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POHow to update a list adapter
 

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  1. POHow to update a list adapter
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    <p>I am creating an android application where i show a list of items and the user can select from them. I am trying to update list if items but the application is crashing all the time, no matter what code i write. the below is what i am doing</p> <p>in the OnCreate method i have the below code</p> <pre><code>adapter = new ArrayAdapter&lt;String&gt;(getActivity(), layout, showArray); setListAdapter(adapter); </code></pre> <p>at the moment, showArray is an empty array and for the now the applciation works.</p> <p>next, I am inserting data in showArray and I am trying to update the list adapter in another method. i am using the below code:</p> <pre><code>adapter = new ArrayAdapter&lt;String&gt;(getActivity(), layout, showArray); setListAdapter(adapter); </code></pre> <p>but the application crashes. I tried to change my code to:</p> <pre><code>adapter = new ArrayAdapter&lt;String&gt;(getActivity(), layout, showArray); adapter.notifyDataSetChanged(); </code></pre> <p>but once again no luck.</p> <p>My full code is below:</p> <pre><code>public class Fragment_AllCommunities extends Fragment { OnHeadlineSelectedListener callBack; // The container Activity must implement this interface so the frag can deliver messages public interface OnHeadlineSelectedListener { public void onCommunitySelected(int position); } private ProgressDialog progress; private Activity activity; private JSONArray communities; private JSONObject[] commDetails; private String[] showArray = {""}; private int layout = 0; private ArrayAdapter&lt;String&gt; adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // We need to use a different list item layout for devices older than Honeycomb 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; adapter = new ArrayAdapter&lt;String&gt;(getActivity(), layout, showArray); setListAdapter(adapter); } public void updateAllCommunities(JSONObject[] commArr) throws JSONException { commDetails = commArr; showArray = new String[commDetails.length]; for(int i=0;i&lt;commDetails.length;i++) { showArray[i] = commDetails[i].getString("name").toString(); } //adapter = new ArrayAdapter&lt;String&gt;(getActivity(), layout, showArray); //adapter.notifyDataSetChanged(); try { adapter.notifyDataSetChanged(); } catch(Exception ex) { String s = ex.getMessage(); } } @Override public void onStart() { super.onStart(); if (getFragmentManager().findFragmentById(R.id.view_community_fragment) != null) { getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); //getListView().setItemChecked(0, true); } } @Override public void onAttach(Activity activity) { super.onAttach(activity); try { callBack = (OnHeadlineSelectedListener) activity; } catch (ClassCastException e) { throw new ClassCastException(activity.toString() + " must implement OnHeadlineSelectedListener"); } } @Override public void onListItemClick(ListView l, View v, int position, long id) { callBack.onCommunitySelected(position); getListView().setItemChecked(position, true); } @Override public void onResume() { super.onResume(); String a = "S"; } } </code></pre> <p>can anyone tell me what I am doing wrong pls?</p> <p>thanks in advance appreciate all responses</p> <p>clive</p>
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    1. COWe need the stacktrace from LogCat.
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    2. COadd stacktrace in question.
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    3. COcan you pls tell me how to do it? i am a beginner in android. sry and thanks
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