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POAndroid ListView adapter wont refresh
 

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  1. POAndroid ListView adapter wont refresh
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    <p>I'm having a lot of trouble refreshing a list view with a custom adapter. I've been searching online for the past hour and I can't seem to find any solution that will make my list view refresh. </p> <p>I've tried notifyDataSetChanged, and also listView.invalidate, but nothing seems to be working. Any help would be greatly appreciated. I can see the data being updated using logcat, but it is not being refreshed on the screen and I have no idea why.</p> <p>Below is the code.</p> <pre><code>ArrayList&lt;Student&gt; students = new ArrayList&lt;Student&gt;(); listview = (ListView) findViewById(R.id.listView); adapter = new StudentAdapter(this, R.layout.listitemlayout, students); listview.setAdapter(adapter); </code></pre> <p>Custom Adapter</p> <pre><code>public class StudentAdapter extends ArrayAdapter&lt;Student&gt;{ Context context; int layoutResourceId; ArrayList&lt;Student&gt; data = null; public StudentAdapter(Context context, int layoutResourceId, ArrayList&lt;Student&gt; data) { super(context, layoutResourceId, data); this.layoutResourceId = layoutResourceId; this.context = context; this.data = data; } public void updateStudentsList(ArrayList&lt;Student&gt; newlist){ data.clear(); data = newlist; this.notifyDataSetChanged(); } public void updateStudentTime(){ for (Student s : data) { s.updateElapsedTime(); } this.notifyDataSetChanged(); } @Override public View getView(int position, View convertView, ViewGroup parent) { View row = convertView; if(row == null){ LayoutInflater inflater = ((Activity)context).getLayoutInflater(); row = inflater.inflate(layoutResourceId, parent, false); Student student = data.get(position); TextView title = (TextView)row.findViewById(R.id.txtTitle); title.setText(student.getFirstname() + " " + student.getLastname()); TextView subTitle = (TextView)row.findViewById(R.id.txtSubTitle); subTitle.setText(student.getStudentID()); TextView duration = (TextView)row.findViewById(R.id.textDuration); duration.setText(student.getElapsedTime()); } return row; } } </code></pre> <p>I update the data using a thread every so often.</p> <pre><code>Runnable runnable = new Runnable() { public void run() { runOnUiThread(new Runnable() { public void run() { // Updates how long the student is in the centre. adapter.updateStudentTime(); adapter.notifyDataSetChanged(); listview.invalidate(); Log.i("Debug", "Running on UI Thread"); } }); handler.postDelayed(this, 1000); } }; handler.postDelayed(runnable, 1000); </code></pre>
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    1. COupdate ui on ui the thread. call adapter.updateStudentTime(); use runonuithread
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      1. USRaghunandan
 

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