Android 使用RSS解析库，不'；不行。应用崩溃

我正在尝试使用这个实现来实现非常简单的RSS解析器，根据实现，我所要做的就是粘贴提供的示例代码，一旦我将代码导入到库中

我已采取的步骤：

从上面提供的链接下载zip文件

从现有代码创建新项目

将添加的项目作为库添加到我的项目中

从上面提供的链接中添加示例代码，并使用try-and-catch语句对其进行修改，并添加textview作为rss提要中标题的输出

尝试并运行应用程序。它崩溃了

是因为图书馆很旧吗？我做错什么了吗？非常感谢您的帮助

---

代码：

package com.example.rssparser;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import org.xml.sax.SAXException;

import nl.matshofman.saxrssreader.RssFeed;
import nl.matshofman.saxrssreader.RssItem;
import nl.matshofman.saxrssreader.RssReader;
import android.app.Activity;
import android.os.Bundle;
//import android.util.Log;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {
TextView rss_feed_data;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    URL url;
    try {
        url = new URL("http://wwwnc.cdc.gov/travel/rss/notices.xml");

        RssFeed feed;
        try {
            feed = RssReader.read(url);
            ArrayList<RssItem> rssItems = feed.getRssItems();
            for(RssItem rssItem : rssItems) {
                //Log.i("RSS Reader", rssItem.getTitle());
                rss_feed_data = (TextView) findViewById(R.id.rss_feed_data);
                rss_feed_data.setText(rssItem.getTitle());

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


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

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
   }

}

---

当应用程序试图在其主线程上执行联网操作时，会引发此异常。在

AsyncTask

中运行代码：

public class MainActivity extends Activity {
TextView rss_feed_data;
String ur = "http://wwwnc.cdc.gov/travel/rss/notices.xml";
ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    rss_feed_data = (TextView) findViewById(R.id.rss_feed_data);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
         new XmlParsing(ur).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new String[]{null});
    else
         new XmlParsing(ur).execute(new String[]{null});

}

public class XmlParsing extends AsyncTask<String, String, ArrayList<RssItem>> {

        // variables passed in:
        String urls;
        //  constructor
        public XmlParsing(String urls) {
            this.urls = urls;
        }

        @Override
        protected void onPreExecute() {
            pDialog = ProgressDialog.show(NetActivity.this, "Fetching Details..", "Please wait...", true);
        }


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


            URL url;
        try {
            url = new URL();

            RssFeed feed;
            try {
                feed = RssReader.read(url);
                ArrayList<RssItem> rssItems = feed.getRssItems();
                return rssItems;
                }
            } catch (SAXException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


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

            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // Now we have your JSONObject, play around with it.
            if (pDialog.isShowing())
                pDialog.dismiss();

            for(RssItem rssItem : rssItems) {
                    //Log.i("RSS Reader", rssItem.getTitle());

                    rss_feed_data.setText(rssItem.getTitle());
        }

    }

公共类MainActivity扩展活动{
TextView rss_提要_数据；
字符串ur=”http://wwwnc.cdc.gov/travel/rss/notices.xml";
ProgressDialog；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
rss_提要_数据=（TextView）findViewById（R.id.rss_提要_数据）；
if（Build.VERSION.SDK\u INT>=Build.VERSION\u code.HONEYCOMB）
新的XmlParsing（ur）.executeOnExecutor（AsyncTask.THREAD_POOL_EXECUTOR，新字符串[]{null}）；
其他的
新建XmlParsing（ur）.execute（新字符串[]{null}）；
}
公共类XmlParsing扩展了异步任务{
//传入的变量：
字符串URL；
//建造师
公共XML解析（字符串URL）{
this.url=url；
}
@凌驾
受保护的void onPreExecute（）{
pDialog=ProgressDialog.show（NetActivity.this，“正在获取详细信息…”，“请稍候…”，true）；
}
@凌驾
受保护的字符串doInBackground（字符串…参数）{
//TODO自动生成的方法存根
网址；
试一试{
url=新url（）；
RssFeed饲料；
试一试{
feed=RssReader.read（url）；
ArrayList rssItems=feed.getRssItems（）；
返回rssItems；
}
}捕获（SAXE异常）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}捕获（IOE异常）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
}捕获（格式错误）{
//TODO自动生成的捕捉块
e、 printStackTrace（）；
}
返回null；
}
@凌驾
受保护的void onPostExecute（字符串结果）{
//现在我们有了您的JSONObject，请使用它。
if（pDialog.isShowing（））
pDialog.disclose（）；
用于（RssItem RssItem:rssItems）{
//Log.i（“RSS阅读器”，rssItem.getTitle（））；
rss_feed_data.setText（rssItem.getTitle（））；
}
}

如果它崩溃了，你能发布你的日志吗？我已经添加了日志。我找到了这个[可能的解决方案]（），但我不确定如何将其实现到我的代码中。我将发布我对它所做的操作。嘿，我不确定代码是否仅通过复制和粘贴就可以工作，但如果是这样的话，它会有很多错误。我通过eclipse建议修复了大多数错误，但其中一个错误没有推荐的解决方案可以工作。最后是rssItems，悬停在它的上方es（rssItems无法解析为变量）。我已经更新了代码。我知道它看不到上面声明的rssItems，但似乎无法解决它。@paddysal在global中使用

ArrayList rssItems；

。是的，我最终解决了这个问题，尽管获取数据要花很长时间。我想我需要使用一些不同的方法。已经过了3分钟，仍然很快程…我添加了logcat，它似乎在一次又一次地做一件事。@paddysal你得到结果了吗？不，它没有返回任何东西，它只是一直在抓取，logcat充满了我上面文章最后一部分的信息。我不知道如何使它工作。我已经在你的web博客上实现了你的代码，它工作正常使用androidhive中的url，但没有尝试修改它以使用我需要的数据来源的rss源url。稍后将进行尝试。

package com.example.rssparser;

import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import nl.matshofman.saxrssreader.RssFeed;
import nl.matshofman.saxrssreader.RssItem;
import nl.matshofman.saxrssreader.RssReader;

import org.xml.sax.SAXException;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.widget.TextView;
//import android.util.Log;

public class MainActivity extends Activity {
TextView rss_feed_data;
String ur = "http://wwwnc.cdc.gov/travel/rss/notices.xml";
ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rss_feed_data = (TextView) findViewById(R.id.rss_feed_data);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
     new XmlParsing(ur).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new String[]{null});
else
     new XmlParsing(ur).execute(new String[]{null});

}

public class XmlParsing extends AsyncTask<String, String, ArrayList<RssItem>> {

    // variables passed in:
    String urls;
    //  constructor
    public XmlParsing(String urls) {
        this.urls = urls;
    }

    @Override
    protected void onPreExecute() {
        pDialog = ProgressDialog.show(MainActivity.this, "Fetching Details..", "Please wait...", true);
    }


    @Override
    protected ArrayList<RssItem> doInBackground(String... params) {
        // TODO Auto-generated method stub


        URL url;
        try {
            url = new URL(urls);
            RssFeed feed;
            try {
                feed = RssReader.read(url);
                ArrayList<RssItem> rssItems = feed.getRssItems();
                return rssItems;
                } catch (SAXException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
                } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace(); }
            } catch (MalformedURLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            return null;
    }

    protected void onPostExecute(String result, ArrayList<RssItem> rssItems) {
        // Now we have your JSONObject, play around with it.
        if (pDialog.isShowing())
            pDialog.dismiss();

        for(RssItem rssItem : rssItems) {
                //Log.i("RSS Reader", rssItem.getTitle());

                rss_feed_data.setText(rssItem.getTitle());
        }

    }
}
}

11-20 05:36:50.439: I/SurfaceTextureClient(17281): [STC::queueBuffer] this:0x516a20a8, api:1, last queue time elapsed :9510 ms
11-20 05:36:50.441: I/SurfaceTextureClient(17281): [0x516a20a8] frames:66, duration:10.505000, fps:6.282219
11-20 05:36:50.473: I/SurfaceTextureClient(17281): [STC::queueBuffer] this:0x51655180, api:1, last queue time elapsed :131816 ms
11-20 05:36:50.494: I/SurfaceTextureClient(17281): [0x51655180] frames:1, duration:131.815994, fps:0.007586
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public class MainActivity extends Activity {
TextView rss_feed_data;
String ur = "http://wwwnc.cdc.gov/travel/rss/notices.xml";
ProgressDialog pDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    rss_feed_data = (TextView) findViewById(R.id.rss_feed_data);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
         new XmlParsing(ur).executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, new String[]{null});
    else
         new XmlParsing(ur).execute(new String[]{null});

}

public class XmlParsing extends AsyncTask<String, String, ArrayList<RssItem>> {

        // variables passed in:
        String urls;
        //  constructor
        public XmlParsing(String urls) {
            this.urls = urls;
        }

        @Override
        protected void onPreExecute() {
            pDialog = ProgressDialog.show(NetActivity.this, "Fetching Details..", "Please wait...", true);
        }


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


            URL url;
        try {
            url = new URL();

            RssFeed feed;
            try {
                feed = RssReader.read(url);
                ArrayList<RssItem> rssItems = feed.getRssItems();
                return rssItems;
                }
            } catch (SAXException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }


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

            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // Now we have your JSONObject, play around with it.
            if (pDialog.isShowing())
                pDialog.dismiss();

            for(RssItem rssItem : rssItems) {
                    //Log.i("RSS Reader", rssItem.getTitle());

                    rss_feed_data.setText(rssItem.getTitle());
        }

    }