Question

我一直致力于一个我想在世界杯开始之前完成的项目。我一直在使用AndroidHive的SlidingMenu和RssReader。我也是Android编程的新手，并且在使用Fragments时遇到了很多麻烦。

基本上，我想使用每个片段的TextViews和Imageview显示足球组数据。我一直遇到的问题是应用一个实际打开Activity而不会崩溃的Button。之前在这个帖子中已经提出过这个问题：

How to start Activity from Fragment? Android

我一直试图实现asynctask，但我不能让它工作。该代码与我发布的链接中描述的100％相同。

这是两个文件的Zip，有人可以帮帮我吗？ http://www.file-upload.net/download-8963794/SlidingMenu.zip.html

提前感谢任何可以帮助我的人！

Answer 1

只需执行以下操作即可使代码正常工作：

只需复制并粘贴如下。除此之外没什么可做的。 Lemme知道您是否需要对代码进行更多解释。

注意：要从片段启动活动，您需要使用getActivity（）然后使用这样的意图，

Intent intent = new Intent(getActivity(),
                        AndroidRssReader.class);
                getActivity().startActivity(intent);

1）只需在FindPeopleFragment中更改一下代码：

public class FindPeopleFragment extends Fragment {

    public FindPeopleFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_find_people,
                container, false);

        return rootView;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);

        Button newPage = (Button) getActivity().findViewById(R.id.button1);
        newPage.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getActivity(),
                        AndroidRssReader.class);
                getActivity().startActivity(intent);
            }
        });

    }
}

2）将您的AndroidRssReader修改为：

public class AndroidRssReader extends ListActivity {

    private List<String> item = new ArrayList<String>();
    public static final String MAIN_URL = "http://drinkandtink.bugs3.com/covendos/Android-er%3Fformat%3Dxml";

    Context context;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        context = this;

        new BackgroundTask(context, MAIN_URL).execute();

    }

    public void getImpData(String URL) {

        try {
            URL rssUrl = new URL(URL);
            SAXParserFactory mySAXParserFactory = SAXParserFactory
                    .newInstance();
            SAXParser mySAXParser = mySAXParserFactory.newSAXParser();
            XMLReader myXMLReader = mySAXParser.getXMLReader();
            RSSHandler myRSSHandler = new RSSHandler();
            myXMLReader.setContentHandler(myRSSHandler);
            InputSource myInputSource = new InputSource(rssUrl.openStream());
            myXMLReader.parse(myInputSource);

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ParserConfigurationException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (SAXException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

    public class BackgroundTask extends AsyncTask<Void, Void, Void> {

        Context mcontext;
        String someURL;
        ProgressDialog pDialog;

        public BackgroundTask(Context context, String SomeURL) {

            super();
            this.mcontext = context;
            this.someURL = SomeURL;

        }

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();
            pDialog = new ProgressDialog(context);
            pDialog.setMessage("Checking Network Connection");
            pDialog.setIndeterminate(true);
            pDialog.setMax(100);
            pDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            pDialog.setCancelable(true);
            pDialog.show();
        }

        @Override
        protected Void doInBackground(Void... params) {
            // TODO Auto-generated method stub

            getImpData(someURL);

            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
            ArrayAdapter<String> itemList = new ArrayAdapter<String>(context,
                    R.layout.rsslist, item);
            setListAdapter(itemList);
            pDialog.dismiss();
        }

    }

    private class RSSHandler extends DefaultHandler {
        final int stateUnknown = 0;
        final int stateTitle = 1;
        int state = stateUnknown;

        @Override
        public void startDocument() throws SAXException {
            // TODO Auto-generated method stub
        }

        @Override
        public void endDocument() throws SAXException {
            // TODO Auto-generated method stub
        }

        @Override
        public void startElement(String uri, String localName, String qName,
                Attributes attributes) throws SAXException {
            // TODO Auto-generated method stub
            if (localName.equalsIgnoreCase("title")) {
                state = stateTitle;
            } else {
                state = stateUnknown;
            }
        }

        @Override
        public void endElement(String uri, String localName, String qName)
                throws SAXException {
            // TODO Auto-generated method stub
            state = stateUnknown;
        }

        @Override
        public void characters(char[] ch, int start, int length)
                throws SAXException {
            // TODO Auto-generated method stub
            String strCharacters = new String(ch, start, length);
            if (state == stateTitle) {
                item.add(strCharacters);

            }
        }

    }

}

现在它的工作非常完美......我肯定会接受我对未来观众的回答..很享受......：D

使用Button从Fragment打开Rss Reader活动

1 个答案: