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POadd data to ListView in a class which extends Activity and not ListActivity
 

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  1. POadd data to ListView in a class which extends Activity and not ListActivity
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    <p>I have a Listview in a relative layout. How can I add data to ListView from the ManActivity which extends Activity. I could have used adapter.notifyDataSetChanged() if i have used the class which extends ListActivity.... i guess. Any suggestions? Thanks in advance</p> <pre><code>Message msg[] = new Message[] { new Message(1, "Hello World", "Thank You"), new Message(1, "Hello World 2", "Thank You 2") }; adapter = new MyAdapter(context, R.layout.row, msg); listview.setAdapter(adapter); </code></pre> <p>Adding this will make my app Crash</p> <pre><code>adapter.add(new Message(1, "Hello World3", "Thank You3")); </code></pre> <p><strong>Logcat text</strong></p> <pre><code>07-07 20:22:53.680: E/AndroidRuntime(1512): FATAL EXCEPTION: AsyncTask #3 07-07 20:22:53.680: E/AndroidRuntime(1512): java.lang.RuntimeException: An error occured while executing doInBackground() 07-07 20:22:53.680: E/AndroidRuntime(1512): at android.os.AsyncTask$3.done(AsyncTask.java:299) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.concurrent.FutureTask.setException(FutureTask.java:219) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.concurrent.FutureTask.run(FutureTask.java:239) 07-07 20:22:53.680: E/AndroidRuntime(1512): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.lang.Thread.run(Thread.java:856) 07-07 20:22:53.680: E/AndroidRuntime(1512): Caused by: java.lang.UnsupportedOperationException 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.AbstractList.add(AbstractList.java:404) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.AbstractList.add(AbstractList.java:425) 07-07 20:22:53.680: E/AndroidRuntime(1512): at android.widget.ArrayAdapter.add(ArrayAdapter.java:179) 07-07 20:22:53.680: E/AndroidRuntime(1512): at com.abhishek.ally2.chat.doInBackground(chat.java:28) 07-07 20:22:53.680: E/AndroidRuntime(1512): at com.abhishek.ally2.chat.doInBackground(chat.java:1) 07-07 20:22:53.680: E/AndroidRuntime(1512): at android.os.AsyncTask$2.call(AsyncTask.java:287) 07-07 20:22:53.680: E/AndroidRuntime(1512): at java.util.concurrent.FutureTask.run(FutureTask.java:234) 07-07 20:22:53.680: E/AndroidRuntime(1512): ... 4 more </code></pre> <p><strong>MyAdapter.java</strong></p> <pre><code>package com.abhishek.ally2; import android.app.Activity; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.TextView; public class MyAdapter extends ArrayAdapter&lt;Message&gt;{ private final Context context; private final Message data[]; int layoutResourceId; public MyAdapter(Context context, int layoutResourceId, Message[] values) { // TODO Auto-generated constructor stub super(context, layoutResourceId, values); this.context = context; this.data = values; this.layoutResourceId = layoutResourceId; } @Override public View getView(int position, View convertView, ViewGroup parent) { View row = convertView; MessageHolder holder = null; if(row == null) { LayoutInflater inflator = ((Activity)context).getLayoutInflater(); row = inflator.inflate(layoutResourceId, parent, false); holder = new MessageHolder(); holder.pic = (ImageView)row.findViewById(R.id.pic); holder.msg = (TextView)row.findViewById(R.id.msg); holder.time = (TextView)row.findViewById(R.id.time); row.setTag(holder); } else { holder = (MessageHolder)row.getTag(); } Message message = data[position]; holder.msg.setText(message.msg); holder.time.setText(message.time); return row; } static class MessageHolder { ImageView pic; TextView msg; TextView time; } } </code></pre>
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    1. USAbhishek Batra
    1. USAbhishek Batra
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    1. COWhether you use an adapter or not has nothing to do with whether you extend ListActivity or not. `myListView.setAdapter(adapter)`. So what *is* your question?
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      1. POadd data to ListView in a class which extends Activity and not ListActivity
      1. USSimon
    2. COi have already used this... now i want to add more data... Something like myListView.addToExistingData()... getting what i want to say ? :P
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      1. POadd data to ListView in a class which extends Activity and not ListActivity
      1. USAbhishek Batra
    3. COI'm not sure what the problem is but you could take a look at the [source code of class ListActivity](https://github.com/android/platform_frameworks_base/blob/master/core/java/android/app/ListActivity.java) and try to mimic some or all of its behavior.
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      1. POadd data to ListView in a class which extends Activity and not ListActivity
      1. USdevconsole
 

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