Databases
StackOverflow2013
Postsdbo
POAndroid Updating ListView
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAndroid Updating ListView
    primarykey
    data
    text
    <p>I have looked at <a href="https://stackoverflow.com/questions/3588893/android-how-to-update-listview-item-that-is-currently-displayed">Android - how to update ListView item that is currently displayed</a> and <a href="http://commonsware.com/Android/excerpt.pdf" rel="nofollow noreferrer">http://commonsware.com/Android/excerpt.pdf</a> and the Android documentation but I still don't understand.</p> <p>My problem:<br> Using a handler, I am trying to update a Stock data multi-column listview which I have populated from a webservice which retrieves data from a MySQL database. To update the listview, I am calling a servlet which returns an XML that I loop through using DOM. </p> <p>I cannot find a working way to apply the new data (from the XML) into the Listview, though only the third column (Trade Column) has to be updated. Also when I try to cast a View from a ListView row, I get a NullPointerException and can't figure out why. </p> <p>The code I have done so far is below.</p> <p><strong>java Code:</strong></p> <pre><code>private void updateUI() throws Exception { Date dt = new Date(); int hours = dt.getHours(); int minutes = dt.getMinutes(); int seconds = dt.getSeconds(); String curTime = hours + ":" + minutes + ":"+ seconds; refreshHandler.sleep(60000); ListView listview = (ListView) findViewById(R.id.listview); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse("http://10.0.0.29:8080/CI3500/FTSEXML"); //Filter and store ALL 'update' XML elements into node array NodeList nodeList = doc.getElementsByTagName("update"); View v = null; TextView t = null; Adapter adapter = listview.getAdapter(); for (int i = 0; i &lt; adapter.getCount(); i++) { v = listview.getChildAt(i); t = (TextView)v.findViewById(R.id.item2); String companyCode = t.getText().toString(); //Column 1 for(int j = 0; j &lt; nodeList.getLength(); j++) { if(companyCode == nodeList.item(j).getFirstChild().getNodeValue()) { //TODO Update Listview Code } } } txtStatus.setText(String.valueOf("Last Update: " + curTime)); } </code></pre> <p>The listview mapping is as follows:</p> <pre><code>// create the grid item mapping String[] columns = new String[] {"col_1", "col_2", "col_3" }; int[] rows = new int[] { R.id.CodeColumn, R.id.NameColumn, R.id.TradeColumn }; </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USMo Patel
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POAndroid Updating ListView
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POAndroid Updating ListView
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POAndroid Updating ListView
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload