我的RSS閱讀器崩潰時沒有互聯網連接

-2

我有一個RSS Reader.My問題是，每一次的Wi-Fi或3G是殘疾人，我的應用程序crashes.This是我的代碼：我的RSS閱讀器崩潰時沒有互聯網連接

private void loadFeed(AsyncTask<Void, Void, Void> asyncTask){ 
     try{ 
      BaseFeedParser parser = new BaseFeedParser(); 
      messages = parser.parse(); 

      } 
     catch (Exception t){ 
      Log.e("OSFP.News_notloading",t.getMessage(),t); 

      Toast.makeText(this, t.getMessage(), Toast.LENGTH_SHORT).show(); 

      finish(); 
     } 
    } 


    private void displayRss(){ 

     ArrayList<HashMap<String, String>> List_nea = new ArrayList<HashMap<String, String>>(messages.size()); 


     for (Message msg : messages){ 

      des.add(msg.getDescription());// keimeno 
      text.add(msg.getTitle());// titlos 
      url.add(msg.getLink());// link 
      imgl.add(msg.getImgLink()); 

     HashMap<String, String> map = new HashMap<String, String>(); 
     map.put("name", msg.getTitle()); 
     map.put("date", msg.getDate());  


     List_nea.add(map); 
     ListAdapter mSchedule = new SimpleAdapter(this, List_nea, R.layout.row, 
       new String[] {"name", "date"}, new int[] {R.id.TextView01, R.id.TextView02}); 
     this.setListAdapter(mSchedule); 
     }} 

public class BackgroundAsyncTask_nea extends 
     AsyncTask<Void, Void, Void> { 
      private ProgressDialog dialog; 
     int myProgress; 

     @Override 
     protected void onPostExecute(Void result) { 
      displayRss(); 
      dialog.dismiss(); 


     } 

     @Override 
     protected void onPreExecute() { 
      // TODO Auto-generated method stub 
       dialog = ProgressDialog.show(nea.this, "", "Loading. Please wait...", true); 
      myProgress = 0; 
     } 

     protected void onProgressUpdate(Integer... progress) { 
      // TODO Auto-generated method stub 
      //super.onProgressUpdate(values); 

      dialog.setProgress(progress[0]); 
     } 

     @Override 
     protected Void doInBackground(Void... arg0) { 
      // TODO Auto-generated method stub 
      loadFeed(this); 
      return null; 
     } 



    }

我怎麼能解決這個問題，請感謝

的logcat：

11-28 18:03:17.640: E/OSFP.News_notloading(6960): java.lang.RuntimeException: java.net.UnknownHostException: feeds.feedburner.com 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): java.lang.RuntimeException: java.lang.RuntimeException: java.net.UnknownHostException: feeds.feedburner.com 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.BaseFeedParser.parse(BaseFeedParser.java:94) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.nea.loadFeed(nea.java:73) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.nea.access$1(nea.java:70) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.nea$BackgroundAsyncTask_nea.doInBackground(nea.java:235) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.nea$BackgroundAsyncTask_nea.doInBackground(nea.java:1) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at android.os.AsyncTask$2.call(AsyncTask.java:185) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.lang.Thread.run(Thread.java:1019) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): Caused by: java.lang.RuntimeException: java.net.UnknownHostException: feeds.feedburner.com 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.BaseFeedParser.getInputStream(BaseFeedParser.java:47) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.BaseFeedParser.parse(BaseFeedParser.java:92) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): ... 10 more 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): Caused by: java.net.UnknownHostException: feeds.feedburner.com 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.net.InetAddress.lookupHostByName(InetAddress.java:506) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:294) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at java.net.InetAddress.getAllByName(InetAddress.java:256) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.retrieveResponse(HttpURLConnectionImpl.java:1018) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:512) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): at kostas.menu.olympiakos.BaseFeedParser.getInputStream(BaseFeedParser.java:45) 
11-28 18:03:17.640: E/OSFP.News_notloading(6960): ... 11 more 
11-28 18:03:17.640: W/dalvikvm(6960): threadid=9: thread exiting with uncaught exception (group=0x40015578) 
11-28 18:03:17.702: E/AndroidRuntime(6960): FATAL EXCEPTION: AsyncTask #1 
11-28 18:03:17.702: E/AndroidRuntime(6960): java.lang.RuntimeException: An error occured while executing doInBackground() 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at android.os.AsyncTask$3.done(AsyncTask.java:200) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.util.concurrent.FutureTask.setException(FutureTask.java:125) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.util.concurrent.FutureTask.run(FutureTask.java:138) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.lang.Thread.run(Thread.java:1019) 
11-28 18:03:17.702: E/AndroidRuntime(6960): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at android.os.Handler.<init>(Handler.java:121) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at android.widget.Toast.<init>(Toast.java:68) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at android.widget.Toast.makeText(Toast.java:231) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at kostas.menu.olympiakos.nea.loadFeed(nea.java:79) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at kostas.menu.olympiakos.nea.access$1(nea.java:70) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at kostas.menu.olympiakos.nea$BackgroundAsyncTask_nea.doInBackground(nea.java:235) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at kostas.menu.olympiakos.nea$BackgroundAsyncTask_nea.doInBackground(nea.java:1) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at android.os.AsyncTask$2.call(AsyncTask.java:185) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306) 
11-28 18:03:17.702: E/AndroidRuntime(6960):  ... 4 more 
11-28 18:03:24.710: E/WindowManager(6960): Activity kostas.menu.olympiakos.nea has leaked window [email protected] that was originally added here 
11-28 18:03:24.710: E/WindowManager(6960): android.view.WindowLeaked: Activity kostas.menu.olympiakos.nea has leaked window [email protected] that was originally added here 
11-28 18:03:24.710: E/WindowManager(6960): at android.view.ViewRoot.<init>(ViewRoot.java:263) 
11-28 18:03:24.710: E/WindowManager(6960): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:171) 
11-28 18:03:24.710: E/WindowManager(6960): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:114) 
11-28 18:03:24.710: E/WindowManager(6960): at android.view.Window$LocalWindowManager.addView(Window.java:424) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.Dialog.show(Dialog.java:241) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.ProgressDialog.show(ProgressDialog.java:107) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.ProgressDialog.show(ProgressDialog.java:90) 
11-28 18:03:24.710: E/WindowManager(6960): at kostas.menu.olympiakos.nea$BackgroundAsyncTask_nea.onPreExecute(nea.java:221) 
11-28 18:03:24.710: E/WindowManager(6960): at android.os.AsyncTask.execute(AsyncTask.java:391) 
11-28 18:03:24.710: E/WindowManager(6960): at kostas.menu.olympiakos.nea.onCreate(nea.java:61) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 
11-28 18:03:24.710: E/WindowManager(6960): at android.os.Handler.dispatchMessage(Handler.java:99) 
11-28 18:03:24.710: E/WindowManager(6960): at android.os.Looper.loop(Looper.java:130) 
11-28 18:03:24.710: E/WindowManager(6960): at android.app.ActivityThread.main(ActivityThread.java:3687) 
11-28 18:03:24.710: E/WindowManager(6960): at java.lang.reflect.Method.invokeNative(Native Method) 
11-28 18:03:24.710: E/WindowManager(6960): at java.lang.reflect.Method.invoke(Method.java:507) 
11-28 18:03:24.710: E/WindowManager(6960): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842) 
11-28 18:03:24.710: E/WindowManager(6960): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600) 
11-28 18:03:24.710: E/WindowManager(6960): at dalvik.system.NativeStart.main(Native Method)

來源

2011-11-28 menu_on_top

一如既往，發佈Logcat與您的例外細節。 – kcoppock

@kcoppock logcat粘貼！ –

使用類似的東西是否正確：http://www.chrisdadswell.co.uk/android-coding-example-checking-for-the-presence-of-an-internet-connection-on-an-android - 設備/ –

有幾個問題：你onPostExecute方法調用displayRss，並在那裏你迭代通過messages而不檢查它是否爲空。所以當你在沒有互聯網訪問的情況下運行時，你可能會得到一個NullPointerException異常（因爲你的解析方法可能會拋出一個例外messages永遠不會被初始化）。

由於您未撥打show而未顯示您的麪包。您需要這樣做：

Toast myToast = Toast.makeText(this, t.getMessage(), Toast.LENGTH_SHORT); 
myToast.show();

來源

2011-11-28 16:00:17 Chris

當然!!這是一個非常愚蠢的錯誤！:) –

我的RSS閱讀器崩潰時沒有互聯網連接

回答

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