使用Button从片段中打开Rss阅读器活动

Question

我一直在做一个我想在世界杯开始前完成的项目。我一直在使用来自AndroidHive的AndroidHive和一个RssReader。我也是android程序的新手，在使用片段时遇到了很多麻烦。

基本上，我希望使用来自每个片段的TextViews和Imageview来显示足球组数据。我一直遇到的问题是应用一个按钮，它实际上打开了活动而不崩溃。这个问题以前曾在这个线程中被问过：

How to start Activity from Fragment? Android

我一直在尝试实现异步任务，但我就是无法让它工作。代码与我发布的链接中所描述的100%相同。

这是两个文件的压缩，有人能帮我吗？http://www.file-upload.net/download-8963794/SlidingMenu.zip.html

提前感谢任何能帮我的人！

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所示。除了那件事没什么可做的。如果您需要对代码进行更多的解释，请告诉我。

注意:要从片段开始活动，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:中稍微修改代码

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);

            }
        }

    }

}

它运行得很好，now..make肯定会接受我对未来观众的回答。快乐..。:D