android– 如何在同一个ListView中使用来自不同Url的提要

概述在我当前的项目中,我可以从单个Url中获取数据,然后在我的自定义列表视图中显示它们.那么有没有一种方法可以从多个Url获取数据然后放入相同的ListView,即使每个Url的数据被调用不同？这是我的代码,允许我从URL获取项目：publicclassCLASS1extendsFragment{privateR

在我当前的项目中,我可以从单个Url中获取数据,然后在我的自定义列表视图中显示它们.
那么有没有一种方法可以从多个Url获取数据然后放入相同的ListVIEw,即使每个Url的数据被调用不同？
这是我的代码,允许我从URL获取项目：

    public  class CLASS1 extends Fragment {    private RSSFeed myRSSFeed = null;    public CLASS1()    {    }    @OverrIDe    public VIEw onCreateVIEw(LayoutInflater inflater, VIEwGroup container,                             Bundle savedInstanceState) {        VIEw vIEw = inflater.inflate(R.layout.tab1, null);        if (androID.os.Build.VERSION.SDK_INT > 9) {            StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();            StrictMode.setThreadPolicy(policy);        }        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);            myRSSFeed = myRSSHandler.getFeed();        } 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();        }        if (myRSSFeed!=null)        {            ListVIEw List = (ListVIEw)vIEw.findVIEwByID(androID.R.ID.List);            CustomList adapter = new CustomList(getActivity(),myRSSFeed.getList());            adapter.addAll();            List.setAdapter(adapter);        }        else            Toast.makeText(getActivity(), "Spiacente, connessione non disponibile!" +                            " Prova più tardi.",                    Toast.LENGTH_LONG).show();        return vIEw;    }}

解决方法:

我正在我的应用程序中这样做,

这就是我这样做的原因,我创建了AsyncTask来解析RSS,并使用循环传递不同的URL来解析为AysncTask.

这就是我的意思,

这是一个URL数组,

private String[] newsURLs = {            "url1", "url2", "url3" };

这就是我执行它们的方式,

//GetNews is AsyncTask classfor (int i = 0; i < newsURLs.length; i++) {                GetNews blog = new GetNews(i);                blog.execute();            }

在上面的代码中,IIS是作为AsyncTask类中的构造函数传入的URL号.

这是我在AsyncTask类中的构造函数,

int number;public GetNews(int urlNumber) {            number = urlNumber;        }

并以这种方式在AsyncTask的doInBackground()方法中加载URL,

                URL FeedURL = new URL(newsURLs[number]);                httpURLConnection connection;                connection = (httpURLConnection) FeedURL.openConnection();                connection.setConnectTimeout(8000);                connection.connect();

之后,我使用SAXParser根据我的需要解析xml.

请注意,如果要并行执行,请替换blog.execute();
同

blog.executeOnExecutor(AsyncTask.THREAD_POol_EXECUTOR);// this type of executor uses the following params:            //            // private static final int CORE_POol_SIZE = 5;            // private static final int MAXIMUM_POol_SIZE = 128;            // private static final int KEEP_AliVE = 1;            //            // private static final ThreadFactory sThreadFactory = new ThreadFactory() {            //     private final AtomicInteger mCount = new AtomicInteger(1);            //            //     public Thread newThread(Runnable r) {            //         return new Thread(r, "AsyncTask #" + mCount.getAndIncrement());            //     }            // };            //            // private static final BlockingQueue<Runnable> sPoolWorkQueue =            //        new linkedBlockingQueue<Runnable>(10);

另请注意,

When first introduced, AsyncTasks were executed serially on a single background thread. Starting
with DONUT, this was changed to a pool of threads allowing multiple
tasks to operate in parallel.
After HONEYCOMB, it is planned to change this back to a single thread
to avoID common application errors caused by parallel execution. If
you truly want parallel execution, you can use the
executeOnExecutor(Executor, Params…) version of this method with
THREAD_POol_EXECUTOR; however, see commentary there for warnings on
its use.

DONUT是AndroID 1.6,HONEYCOMB是AndroID 3.0.

您也可以根据自己的版本执行任务,

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {    blog.executeOnExecutor(AsyncTask.THREAD_POol_EXECUTOR);} else {    blog.execute();}

这是我的部分代码来展示我在做什么,

    // This is my Main classprivate String[] newsURLs = {            "url1", "url2", "url3" };    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_myapp);            for (int i = 0; i < newsURLs.length; i++) {                GetNews blog = new GetNews(i);                blog.execute();            }        }    }

这是AsyncTask类(部分代码),

private class GetNews extends        AsyncTask<Object, VoID, VoID> {    protected int number;    public GetNews(int urlNumber) {        number = urlNumber;    }    @OverrIDe    protected voID doInBackground(            Object... arg0) {        try {            // Check if the Feed is live            URL FeedURL = new URL(newsURLs[number]);            httpURLConnection connection;            connection = (httpURLConnection) FeedURL.openConnection();            connection.setConnectTimeout(8000);            connection.connect();

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