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POgetting error - java.lang.UnsupportedOperationException
 

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  1. POgetting error - java.lang.UnsupportedOperationException
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    <p>I have written some code to set data to <code>listview</code> from a webpage. I have read the webpage successfully and stored necessary data in <code>String</code> array. Now i want to assign that to <code>ListView</code> using <code>ArrayAdapter</code> but the data is not getting set in <code>listview</code>. Please help me solve the error:</p> <p><strong>FULL LOG CAT</strong></p> <pre><code>11-07 23:41:40.150: E/AndroidRuntime(3400): FATAL EXCEPTION: main 11-07 23:41:40.150: E/AndroidRuntime(3400): java.lang.UnsupportedOperationException 11-07 23:41:40.150: E/AndroidRuntime(3400): at java.util.AbstractList.add(AbstractList.java:411) 11-07 23:41:40.150: E/AndroidRuntime(3400): at java.util.AbstractList.add(AbstractList.java:432) 11-07 23:41:40.150: E/AndroidRuntime(3400): at android.widget.ArrayAdapter.add(ArrayAdapter.java:178) 11-07 23:41:40.150: E/AndroidRuntime(3400): at com.air.test.Smscollection$sendMessageAsync.onPostExecute(Smscollection.java:91) 11-07 23:41:40.150: E/AndroidRuntime(3400): at com.air.test.Smscollection$sendMessageAsync.onPostExecute(Smscollection.java:1) 11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.AsyncTask.finish(AsyncTask.java:417) 11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.AsyncTask.access$300(AsyncTask.java:127) 11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429) 11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.Handler.dispatchMessage(Handler.java:99) 11-07 23:41:40.150: E/AndroidRuntime(3400): at android.os.Looper.loop(Looper.java:130) 11-07 23:41:40.150: E/AndroidRuntime(3400): at android.app.ActivityThread.main(ActivityThread.java:3683) 11-07 23:41:40.150: E/AndroidRuntime(3400): at java.lang.reflect.Method.invokeNative(Native Method) 11-07 23:41:40.150: E/AndroidRuntime(3400): at java.lang.reflect.Method.invoke(Method.java:507) 11-07 23:41:40.150: E/AndroidRuntime(3400): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 11-07 23:41:40.150: E/AndroidRuntime(3400): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 11-07 23:41:40.150: E/AndroidRuntime(3400): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>Output of logcat so as to verify that data is being stored in <code>String array</code></p> <pre><code>11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies 11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly 11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfies 11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly 11-07 23:03:47.640: I/NEW VAUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies 11-07 23:03:47.640: I/VALUES(3192): Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies&lt;br/&gt;Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly&lt;br/&gt;Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfies&lt;br/&gt;Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterfly&lt;br/&gt;Happiness is Like a Butterfly, You run after it, It keeps flying away. But if you stand still, It comes and Sits On You Wish you lots of Butterflies </code></pre> <p><strong>CODE</strong></p> <pre><code>public class Smscollection extends Activity { private Spinner spinner1; private ProgressDialog pd; private StringBuilder response; private ListView listView; private String[] values = new String[0]; private ArrayAdapter&lt;String&gt; adapter; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_smscollection); listView = (ListView) findViewById(R.id.mylist); spinner1 = (Spinner) findViewById(R.id.spinnerCategory); spinner1.setOnItemSelectedListener(new OnItemSelectedListener() { public void onItemSelected(AdapterView&lt;?&gt; av, View view, int id, long ids) { new sendMessageAsync().execute(); } public void onNothingSelected(AdapterView&lt;?&gt; av) { } }); adapter = new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_1, android.R.id.text1, values); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.activity_smscollection, menu); return true; } private class sendMessageAsync extends AsyncTask&lt;Void, Void, String&gt; { @Override protected void onPreExecute() { pd = ProgressDialog.show(Smscollection.this, null, "Loading...", true, true); } @Override protected void onCancelled() { Toast.makeText(getApplicationContext(), "Message Sending Cancelled", Toast.LENGTH_LONG).show(); } @Override protected String doInBackground(Void... arg0) { try { return doInBg(); } catch (Exception ex) { ex.printStackTrace(); } return null; } @Override protected void onPostExecute(String result) { pd.dismiss(); if (result == null) { // request failed! // return; } values = String.valueOf(result).split("&lt;br/&gt;"); adapter.clear(); for (String str : values) { adapter.add(str); } adapter.notifyDataSetChanged(); listView.setAdapter(adapter); } } public String doInBg() { String responseRes = null; try { final String msgURL = "http://freesmsit.tk/msg/messages.php?category=" + String.valueOf(spinner1.getSelectedItem().toString() .replace(" ", "%20")); URLConnection connection = new URL(msgURL).openConnection(); connection.setRequestProperty("Accept-Charset", "UTF-8"); InputStream responseStream = connection.getInputStream(); BufferedReader br = new BufferedReader(new InputStreamReader(responseStream)); response = new StringBuilder(); String line; while ((line = br.readLine()) != null) { response.append(line); } responseRes = response.toString(); } catch (Exception ex) { ex.printStackTrace(); } return responseRes; } } </code></pre>
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    1. USTapan Desai
    1. USTapan Desai
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    1. PO
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    1. VO
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      1. POgetting error - java.lang.UnsupportedOperationException
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    2. VO
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      1. POgetting error - java.lang.UnsupportedOperationException
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    3. VO
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    1. COHow about posting the logcat for the exception itself? That would be more useful.
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      1. POgetting error - java.lang.UnsupportedOperationException
      1. USTed Hopp
    2. CO@TedHopp i have added the full log cat output
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      1. POgetting error - java.lang.UnsupportedOperationException
      1. USTapan Desai
    3. COfunny, this should work as ArrayAdapter is supposed to provide an actual List when you pass an array. I would create a new Adapter rather than clearing and adding new items.
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