Question

onPostExecute（）在doInBackground（）结束后正常运行..我尝试将log.e（）放在doInBackgound（）的末尾但是我在日志中看不到任何消息...我跳过帧消息甚至很难我＆＃39 ; m使用asynctask。

class RssFeedTask extends AsyncTask<String, Void, String> {

ProgressDialog Dialog;
String response = "";
Activity context;
ArrayList<MyItem> mostLatestItems = new ArrayList<MyItem>();
MyListAdapter adapter;
XmlPullParser xpp;
boolean showAll;

public RssFeedTask(Activity context, boolean showAll) {
    this.context = context;
    this.showAll = showAll;
}

@Override
protected void onPreExecute() {
    Dialog = new ProgressDialog(context);
    Dialog.setMessage("Loading...");
    Dialog.show();
}

@Override
protected String doInBackground(String... urls) {
    try {

        XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
        factory.setNamespaceAware(false);
        xpp = factory.newPullParser();
        for (String feed : urls){
            xpp.setInput(getInputStream(new URL(feed)), "UTF_8");
            mostLatestItems.addAll(getLatestArticles(feed,showAll));
        }
    } catch (Exception e) {
    }
    return response;
}

@Override
protected void onPostExecute(String result) {
    mostLatestItems = BubleSort(mostLatestItems);
    adapter = new MyListAdapter(context, mostLatestItems);
    ((HasListView) context).getListView().setAdapter(adapter);
    ((HasListView) context).getListView().setOnItemClickListener(
            new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    String url = ((MyItem) adapter.getItem(position))
                            .getLink();
                    Intent i = new Intent(Intent.ACTION_VIEW);
                    i.setData(Uri.parse(url));
                    context.startActivity(i);
                }

            });
    Dialog.dismiss();
}

public ArrayList<MyItem> getLatestArticles(String feedUrl,boolean showAll) {
    ArrayList<MyItem> rssList = new ArrayList<MyItem>();
    MyItem item = null;
    try {

        boolean insideItem = false;
        int eventType = xpp.getEventType();
        while (eventType != XmlPullParser.END_DOCUMENT) {
            if (eventType == XmlPullParser.START_TAG) {

                if (xpp.getName().equalsIgnoreCase("item")) {
                    insideItem = true;
                } else if (xpp.getName().equalsIgnoreCase("title")) {
                    if (insideItem)
                        item.setHeadLine(xpp.nextText());
                } else if (xpp.getName().equalsIgnoreCase("link")) {
                    if (insideItem)
                        item.setLink(xpp.nextText());
                } else if (xpp.getName().equalsIgnoreCase("url")) {
                    if (insideItem)
                        item.setIconSrc(xpp.nextText());
                } else if (xpp.getName().equalsIgnoreCase("pubDate")) {
                    if (insideItem)
                        item.setPubDate(xpp.nextText());
                }
            }else if(eventType==XmlPullParser.END_TAG && xpp.getName().equalsIgnoreCase("item")){
                insideItem=false;
                rssList.add(item);
                if(!showAll)break;
            }

            eventType = xpp.next();
        }

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (XmlPullParserException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return rssList;
}
public InputStream getInputStream(URL url) {
       try {
           return url.openConnection().getInputStream();
       } catch (IOException e) {
           return null;
         }
    }

private ArrayList<MyItem> BubleSort(ArrayList<MyItem> a) {
    int i, j;
    MyItem t = null;
    int n = a.size();
    for (i = 0; i < n; i++) {
        for (j = 1; j < (n - i); j++) {
            if (a.get(j - 1).getPubDate().compareTo(a.get(j).getPubDate()) == 1) {
                t = a.get(j - 1);
                a.set(j - 1, a.get(j));
                a.set(j, t);
            }
        }
    }
    return a;
}
}

xml链接：＆＃34; http://www.medicalnewstoday.com/rss/diabetes.xml＆＃34;，＆＃34; http://www.diabetesnews.com/feed/＆＃34;

Answer 1

您正在尝试使用在doInBackground任务中解析的内容设置列表。

将此代码块放在onPostExecute

中

        for (String feed : urls){
            xpp.setInput(getInputStream(new URL(feed)), "UTF_8");
            mostLatestItems.addAll(getLatestArticles(feed,showAll));
        }

doInBackground（String ... urls）结束不完整的AsyncTask

1 个答案: