Java 单击Rss阅读器后打开导航器

我有一个使用rss的新闻阅读器，它也可以工作，现在我尝试在点击新闻后打开导航器，但我不知道如何获取链接我只知道我必须使用getLink，但我不知道在哪里：

实现.java

public class Actualites extends android.support.v4.app.Fragment{
    AsyncTask<Void, Void, List> a = null;
    NewsAdapter adapter = null;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        View view = inflater.inflate(R.layout.activity_actualites, container, false);
        ListView list = (ListView) view.findViewById(R.id.listView1);
        adapter = new NewsAdapter(getActivity(), new ArrayList<News>());
        list.setAdapter(adapter);
        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                startActivity(new Intent(Intent.ACTION_VIEW).setData(Uri.parse("http://www.solutis.fr")));
            }
        });
        a = new AsyncTask<Void, Void, List>() {
            @Override
            protected List doInBackground(Void... params) {
                ArrayList<News> res = new ArrayList<News>();
                try {
                    URL url = new URL("http://www.solutis.fr/actualites-rachat-credit,rss.html?format=feed");
                    HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
                    RssParser parser = new RssParser();
                    try {
                        return parser.parse(urlConnection.getInputStream());
                    } catch (XmlPullParserException e) {
                        e.printStackTrace();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }
                return res;
            }

            @Override
            protected void onPostExecute(List result) {
                adapter.update(result);
            }
        };
        a.execute();
        TextView textView =(TextView)getActivity().findViewById(R.id.main_toolbar_title);
        textView.setText(getString(R.string.title_actu));
        textView.setTypeface(Typeface.createFromAsset(getActivity().getAssets(), "fonts/GothamBook.ttf"));
        return view;
    }
}

---

我必须更改公共链接，我刚刚输入了一个url，但我必须获取新闻的url，但我不知道如何做到这一点。有人可以帮我吗？

您可以使用onItemClick中的position参数从适配器获取新闻对象。我还没有测试代码，但它将是如下所示的东西

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

---

我得到一个错误：致命的异常：main java.lang.NullPointerException:uriString在android.net.Uri$StringUri.Uri.java:464在android.net.Uri$StringUri.Uri.java:454在android.net.Uri.parseUri.java:426在package.implementes$1.onicmclickimplementes.java:37我想这是因为它不是一个StringUri注意，在RSSParser中，您正在调用entries.addNewNewsTitle、pubDate、content；您需要调用接受链接的版本并将其传递给其他用户。我建议您在onItemClick上设置一个断点，并检查返回的新闻对象。在RSSParser中，我不在条目中调用链接，因为我不想在视图中显示链接。接受链接的版本？我把断点放在新闻的好位置，但是当我把光标放在getLink上时，我什么也看不到；我得到url:Null我不知道为什么，但如果我启动了startActivitynew Intentint.ACTION\u VIEW.setDataUri.parsenews.getTitle；它的工作。。。

public class RssParser {
    private String readText(XmlPullParser parser) throws IOException, XmlPullParserException {
        String result = "";
        if (parser.next() == XmlPullParser.TEXT) {
            result = parser.getText();
            parser.nextTag();
        }
        return result;
    }
    private static final String ns = null;

    private void skip(XmlPullParser parser) throws XmlPullParserException, IOException {
        if (parser.getEventType() != XmlPullParser.START_TAG) {
            throw new IllegalStateException();
        }
        int depth = 1;
        while (depth != 0) {
            switch (parser.next()) {
                case XmlPullParser.END_TAG:
                    depth--;
                    break;
                case XmlPullParser.START_TAG:
                    depth++;
                    break;
            }
        }
    }

    public ArrayList<News> parse(InputStream in) throws XmlPullParserException, IOException {
        XmlPullParser parser = Xml.newPullParser();
        parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
        parser.setInput(in, null);
        parser.nextTag();
        ArrayList<News> entries = new ArrayList<News>();

        parser.require(XmlPullParser.START_TAG, ns, "rss");
        parser.nextTag();
        parser.require(XmlPullParser.START_TAG, ns, "channel");
        while (parser.next() != XmlPullParser.END_TAG) {
            if (parser.getEventType() != XmlPullParser.START_TAG) {
                continue;
            }
            String name = parser.getName();
            if (name.equals("item")) {
                String title = "";
                String link = "";
                String pubDate = "";
                String content = "";
                while (parser.next() != XmlPullParser.END_TAG) {
                    if (parser.getEventType() != XmlPullParser.START_TAG) {
                        continue;
                    }
                    name = parser.getName();
                    if (name.equals("title")) {
                        title = readText(parser);
                    } else if (name.equals("link")) {
                        link = readText(parser);
                    } else if (name.equals("pubDate")) {
                        pubDate = readText(parser);
                    } else if (name.equals("description")) {
                        content = readText(parser);
                    } else
                        skip(parser);
                }
                entries.add(new News(title, pubDate, content));
            }  else
                skip(parser);
        }
        return entries;
    }
}

public class News {
    private String title;
    private String content;
    private String pubDate;
    private String link;

    public News(String title, String pubDate, String content) {
        this.title = title;
        this.content = content;
        this.pubDate = pubDate;
    }

    public News(String link, String title, String pubDate, String content) {
        this.link = link;
        this.title = title;
        this.content = content;
        this.pubDate = pubDate;
    }

    public String getTitle() {
        return (title);
    }

    public String getContent() {
        return (content);
    }

    public String getPubDate(){
        return (pubDate);
    }

    public String getLink(){
        return (link);
    }
}

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