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POFatal exception : AsyncTask #1
 

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  1. POFatal exception : AsyncTask #1
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    <p>I want to use a AsynTask to parse XML data. So in the Activity i've : </p> <pre><code>static List&lt;String&gt; citations = null; static void setCitations(List&lt;String&gt; data) { citations = data; } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); new data().execute(); </code></pre> <p>And in the data class i've : </p> <pre><code>class data extends AsyncTask&lt;Void, Void, List&lt;String&gt;&gt; { private XMLReader saxReader; private SimpleContentHandler simpleContentHandler; private List&lt;String&gt; citations; @Override protected void onPreExecute() { Log.i("AsyncTask", "onPreExecute"); } @Override public void onPostExecute(List&lt;String&gt; citations) { GuiguiActivity.setCitations(citations); } @Override protected List&lt;String&gt; doInBackground(Void... params) { citations.add("TEST 1");citations.add("TEST 2"); return citations; } } </code></pre> <p>Instead of the citations.add i've my XML parser, but even in this case with citations.add errors occur.</p> <pre><code>10-24 15:28:46.647: E/AndroidRuntime(1160): FATAL EXCEPTION: AsyncTask #1 10-24 15:28:46.647: E/AndroidRuntime(1160): java.lang.RuntimeException: An error occured while executing doInBackground() 10-24 15:28:46.647: E/AndroidRuntime(1160): at android.os.AsyncTask$3.done(AsyncTask.java:278) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask.setException(FutureTask.java:124) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 10-24 15:28:46.647: E/AndroidRuntime(1160): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.lang.Thread.run(Thread.java:856) 10-24 15:28:46.647: E/AndroidRuntime(1160): Caused by: java.lang.NullPointerException 10-24 15:28:46.647: E/AndroidRuntime(1160): at guigui.first.project.data.doInBackground(data.java:82) 10-24 15:28:46.647: E/AndroidRuntime(1160): at guigui.first.project.data.doInBackground(data.java:1) 10-24 15:28:46.647: E/AndroidRuntime(1160): at android.os.AsyncTask$2.call(AsyncTask.java:264) 10-24 15:28:46.647: E/AndroidRuntime(1160): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) </code></pre> <p>I don't see where the problem is.</p> <p>Thanks :)</p>
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    1. PO
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    1. COThere is another problem now. In the doInBackground i'm getting the XML data. So I've to send this data to the view. At the beginning I have `setListAdapter(new ArrayAdapter<String>(this, R.layout.list_item, MyArrayOfCitations));` And MyArrayOfCitations was something like that : `String[] = new String[] {"A","B"};` And now MyArrayOfCitations must be replace by a List<String> But how do I do if the data retrieving XML start after the displaying of the UI ?
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