I have a running async task in my android application which runs perfectly. However I would like to know if it possible to return a string value from the asynctask in android as well as update a UI item. I want to update to a rating stars in the UI update and return a list of information from my server (which is working now).
Is it possible to return a value and update a UI from one asynctask in android??
Code for my Asynctask is below:
public class ConnectToServer extends AsyncTask< String, String, ArrayList<String>> {
@Override
protected ArrayList<String> doInBackground(String... params)
{
Socket client;
DataInputStream input;
DataOutputStream output;
String results = "";
XMLCreator x = new XMLCreator();
ArrayList<String> lists = new ArrayList<String>();
try
{
Log.i("CLIENT", "Client started");
// Step 1: Create a Socket to make connection.
// client = new Socket(InetAddress.getLocalHost(), 500);
client = new Socket("*****", 5001);
Log.i("CLIENT", "Connected to: "
+ client.getInetAddress().getHostName());
publishProgress("Connected...");
// Step 2: Get the input and output streams.
input = new DataInputStream(client.getInputStream());
output = new DataOutputStream(client.getOutputStream());
Log.i("CLIENT", "Got I/O Streams");
publishProgress("Obtained Streams...");
// Step 3: Process connection.
//Read in the value that the user selected from the bundle
String Day = params[0].toString();
//put into XML document as a query
//create a string
Document doc;
try
{
//Create an XML document with tutor's student number
doc = x.createDoc();
Element tutor = doc.createElement("Query");
tutor.appendChild(x.createDayforSession(doc, "GetSessionByDay", Day));
doc.appendChild(tutor);
//Create a string
String s = x.getStringFromDocument(doc);
output.writeUTF(s);
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
publishProgress("Processing");
//Get all the session information for that day in XML string
//Create a document
//Break it up and add it to the view
results = input.readUTF();
try
{
//Creates the document
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document document = builder.parse(new InputSource(new StringReader(results)));
//optional, but recommended
//read this - http://stackoverflow.com/questions/13786607/normalization-in-dom-parsing-with-java-how-does-it-work
document.getDocumentElement().normalize();
//Look at root node's type (e.g. <query> or <login> or <add>)
String rootNode = document.getDocumentElement().getNodeName().toString();
if (rootNode.equals("Result"))
{
//Any methods which need to be called that will be used to query the database
//Always sending the String XML through as a parameter
//Look at the child node
NodeList nList = document.getElementsByTagName("Query");
System.out.println("----------------------------");
for (int temp = 0; temp < nList.getLength(); temp++)
{
Node nNode = nList.item(temp);
if (nNode.getNodeType() == Node.ELEMENT_NODE)
{
Element eElement = (Element) nNode;
String Semester = eElement.getElementsByTagName("Semester").item(0).getTextContent();
String StartTime = eElement.getElementsByTagName("StartTime").item(0).getTextContent();
String Days = eElement.getElementsByTagName("Day").item(0).getTextContent();
String Lab = eElement.getElementsByTagName("Lab").item(0).getTextContent();
String session = "Semester: " + Semester + "\n" + "StartTime: " + StartTime + "\n" + "Days: " + Days + "\n" + "Lab: " + Lab + "\n";
lists.add(session);
}
}
}
}
catch (Exception e)
{
e.getMessage();
}
// Step 4: Close connection.
Log.i("CLIENT", "Transmission complete. "
+ "Closing connection.");
output.writeUTF("TERMINATE");
client.close();
publishProgress("Closed connection...");
} catch (IOException e) {
e.printStackTrace();
}
return lists;
}
@Override
protected void onPostExecute(ArrayList<String> lists)
{
super.onPostExecute(lists);
//UPDATE A STAR RATING HERE
}
@Override
protected void onProgressUpdate(String... values)
{
super.onProgressUpdate(values);
}
}
