How to return values from a thread

Question

I'm pulling in an rss feed in a new thread (class that implements runnable, shown below) I want to use the strings I get from the rss feed and return them to the main class. The main class simply runs the thread like so

new Thread(new RssParse()).start();

I'm having a really hard time finding ways to return these strings that were cut out of the xml to the main class. Any help is appreciated thanks.

public class RssParse implements Runnable  {

            private static final String MY_DEBUG_TAG = "pfaff";


            public void run(){

            System.out.println("1");
            URL iotd;
            try{

                iotd = new URL("http://www.nasa.gov/rss/image_of_the_day.rss");//set URl
                BufferedReader in;//new BufferedReader
                in = new BufferedReader(new InputStreamReader(iotd.openStream()));//get rss

                XmlPullParserFactory factory;
                factory = XmlPullParserFactory.newInstance();//new factory


                factory.setNamespaceAware(true);
                XmlPullParser xpp;
                xpp = factory.newPullParser();
                xpp.setInput(in);


                int eventType;
                eventType = xpp.getEventType();

                System.out.println(eventType+"!!!!!!!!!!!!!!!!");

            while(eventType!=XmlPullParser.END_DOCUMENT){

                switch(eventType){

                case XmlPullParser.START_DOCUMENT:
                    break;
                case XmlPullParser.START_TAG:
                    String tagName=xpp.getName();
                    System.out.println(tagName+" "+xpp.getDepth());
                    if(tagName.equals("title")&& xpp.getDepth()==4){//depth is specific to this certain rss feed, there are multiple tags with the same names
                        String title=xpp.nextText();// I want to return title and a few other strings but can't figure out how to do this when dealing with threads.
                        System.out.println(title);
                    }

                    break;

                }
                eventType=xpp.next();
            }//switch


                in.close();//close BufferedReader
            } catch (MalformedURLException e){
                e.printStackTrace();
            }catch(XmlPullParserException e1){
                e1.printStackTrace();
            }catch(IOException e2){
                e2.printStackTrace();
            }           
      }//method


}//class

In Java 5 you would use a Future. See here.

OldCurmudgeon
– OldCurmudgeon

2012-07-12 00:29:28 +00:00
Commented Jul 12, 2012 at 0:29 — OldCurmudgeon
– OldCurmudgeon, Commented Jul 12, 2012 at 0:29

KV Prajapati · Accepted Answer · 2012-07-11 05:37:49Z

4

I'd like to suggest AsyncTask. You have to override doInBackground(Params...) and onPostExecute(Result) of AsyncTask in your sub-class.

Tutorial : Android Threads, Handlers and AsyncTask - Tutorial

edited Jul 11, 2012 at 5:37

answered Jul 11, 2012 at 2:52

KV Prajapati

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3 Comments

Tyler Pfaff Over a year ago

That looks like exactly what I need, looking into it right now, thanks!

Tyler Pfaff Over a year ago

Googles example is a little confusing. Do you know of any better ones?

Tyler Pfaff Over a year ago

This worked great thanks, can you pass more than one type though? I invoke like the thread like so.... new RssParseSync(this).execute(title,description,date); where all 3 params are strings, any way to pass 3 strings and a bitmap?

Vishwanath.M · Accepted Answer · 2012-07-11 03:31:54Z

0

you can use handler to post it in to main thread

 Runnable runnable = new Runnable() 
 {
  @Override
  public void run() {
   for (int i = 0; i <= 10; i++) {
    handler.post(new Runnable() {
        @Override
            public void run() {
                progress.setProgress(value);
            }
        });
    }
}

};

answered Jul 11, 2012 at 3:31

Vishwanath.M

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1 Comment

Vishwanath.M Over a year ago

Inside your run method the object you want to post in to main thread there you can place this code

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