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希望你一切都好:)

我想使用 AsyncTask 来解析 XML。确实，在应用程序启动时，我在网上解析 XML 文件，但我想使用 API 11 及更高版本上的一些可用功能，但我必须将解析放入 AsyncTask 中，我真的不知道该怎么做做这个！

这是我在开始时执行的 onCreate() 方法（类“Main”）：

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        feeds = DataFeed.getFeeds();
        lfa = new ListFeedAdapter(this, feeds);
        feedView = ((ListView)findViewById(R.id.listFeed));
        feedView.setAdapter(lfa);    

        feedView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> adapter, View view, int position, long id) { 

                Feed feed = (Feed) feedView.getItemAtPosition(position);
                Log.d("Date", ""+getDatePreferedFormat(feed.getPubDate()));
            }
        });

        feedView.setOnItemLongClickListener(new OnItemLongClickListener() {

            @Override
            public boolean onItemLongClick(AdapterView<?> adapter, View view, int position, long id) {  
                shareIt(position);
                return true;
            }
        });
    }

这里是“DataFeed.class”类中的 getFeeds() 方法：

public static ArrayList<Feed> getFeeds(){

        SAXParserFactory factory = SAXParserFactory.newInstance();
        SAXParser parsor = null;
        ArrayList<Feed> feeds = null;
        try {

            parsor = factory.newSAXParser();
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        }

        URL url = null;
        try {
            url = new URL("http://localhost/feed");
        } catch (MalformedURLException e1) {
            e1.printStackTrace();
        }

        DefaultHandler handler = new ParserXMLHandler();
        try {

                // Parsing and get all data
        parsor.parse(url.openConnection().getInputStream(), handler);   
        feeds = ((ParserXMLHandler) handler).getData();

        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // Return arrayList with feeds
        return feeds;
    }

真的很感谢你的帮助！

4

1 回答 1

2

请参阅此代码 -

private class BgTask extends AsyncTask<Void, Void, Boolean> {

  @Override
  protected Boolean doInBackground(Void... params) {
  //TODO - Call getFeeds Method to populate feeds list & return true/false depending on result of operation
   try {
    feeds = getFeeds();
   } catch(Exception e){
    e.printStackTrace();
    return false;
   }
   return true;
  }

  @Override
  protected void onPostExecute(Boolean result) {
   if(result){
    lfa = new ListFeedAdapter(YourActivity.this, feeds);
    feedView.setAdapter(lfa);
   }
  }

}

在onCreate-

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        feedView = ((ListView)findViewById(R.id.listFeed));
        new BgTask().execute(); 

        feedView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> adapter, View view, int position, long id) { 

                Feed feed = (Feed) feedView.getItemAtPosition(position);
                Log.d("Date", ""+getDatePreferedFormat(feed.getPubDate()));
            }
        });

        feedView.setOnItemLongClickListener(new OnItemLongClickListener() {

            @Override
            public boolean onItemLongClick(AdapterView<?> adapter, View view, int position, long id) {  
                shareIt(position);
                return true;
            }
        });
    }
于 2013-09-14T20:32:01.230 回答