Android Crash Reader RSS au démarrage

Question

Je travaille sur un lecteur RSS simple pour Android. Voici le code que j'ai:

package com.example.rssreader; 

public class MainActivity extends ListActivity { 

List headlines; 
List links; 
static final int DIALOG_ERROR_CONNECTION = 1; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    if (!isOnline(this)) { 
     showDialog(DIALOG_ERROR_CONNECTION); 
    } else { 

    // initializing instance variables 
    headlines = new ArrayList(); 
    links = new ArrayList(); 

    try { 
     URL url = new URL("http://feeds.pcworld.com/pcworld/latestnews"); 

     XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); 
     factory.setNamespaceAware(false); 
     XmlPullParser xpp = factory.newPullParser(); 

     // We will get the XML from an input stream 
     xpp.setInput(getInputStream(url), "UTF_8"); 

     /* We will parse the XML content looking for the <title> tag which appears inside the <item> tag. 
     * However, we should take in consideration that the rss feed name also is enclosed in a <title> tag. 
     * As we know, every feed begins with these lines: <channel><title>Feed_Name</title>... 
     * so we should skip the <title> tag which is a child of <channel> tag, 
     * and take in consideration only <title> tag which is a child of <item> 
     * 
     * In order to achieve this, we will make use of a boolean variable. 
     */ 

     boolean insideItem = false; 

     // Returns the type of current event: START_TAG, END_TAG, etc.. 
     int eventType = xpp.getEventType(); 
     while (eventType != XmlPullParser.END_DOCUMENT) { 
      if (eventType == XmlPullParser.START_TAG) { 

       if (xpp.getName().equalsIgnoreCase("item")) { 
        insideItem = true; 
       } else if (xpp.getName().equalsIgnoreCase("title")) { 
        if (insideItem) 
         headlines.add(xpp.nextText()); // extract the headline 
       } else if (xpp.getName().equalsIgnoreCase("link")) { 
        if (insideItem) 
         links.add(xpp.nextText()); // extract the link of article 
       } 
      } else if (eventType == XmlPullParser.END_TAG && xpp.getName().equalsIgnoreCase("item")) { 
       insideItem = false; 
      } 

      eventType = xpp.next(); // move to next element 
     } 
    } catch (MalformedURLException e) { 
     e.printStackTrace(); 
    } catch (XmlPullParserException e) { 
     e.printStackTrace(); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    } 

    // Binding data 
    ArrayAdapter adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, headlines); 

    setListAdapter(adapter); 

    } 
} 

public InputStream getInputStream(URL url) { 
    try { 
     return url.openConnection().getInputStream(); 
    } catch (IOException e) { 
     return null; 
    } 
} 

public boolean isOnline(Context c) { 
    ConnectivityManager cm = (ConnectivityManager) c.getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo ni = cm.getActiveNetworkInfo(); 

    if(ni!=null && ni.isConnected()) 
     return true; 
    else 
     return false; 
} 

@Override 
protected Dialog onCreateDialog(int id) { 
    Dialog dialog = null; 
    switch(id) { 
    case DIALOG_ERROR_CONNECTION: 
     AlertDialog.Builder errorDialog = new AlertDialog.Builder(this); 
     errorDialog.setTitle("Error"); 
     errorDialog.setMessage("No internet connection."); 
     errorDialog.setNeutralButton("OK", new DialogInterface.OnClickListener() { 

      public void onClick(DialogInterface dialog, int id) { 
       dialog.dismiss(); 
      } 
     }); 

     AlertDialog errorAlert = errorDialog.create(); 
     return errorAlert; 

     default: 
      break; 
    } 
    return dialog; 
} 

@Override 
protected void onListItemClick(ListView l, View v, int position, long id) { 
    Uri uri = Uri.parse((String) links.get(position)); 
    Intent intent = new Intent(Intent.ACTION_VIEW, uri); 
    startActivity(intent); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    getMenuInflater().inflate(R.menu.activity_main, menu); 
    return true; 
} 
} 

Je ne reçois pas d'erreur dans le code, mais lorsque je tente de le lancer, il se bloque. Je ne peux pas comprendre pourquoi cependant. Ceci est mon journal:

09-19 09:49:18.207: E/AndroidRuntime(3360): FATAL EXCEPTION: main 
09-19 09:49:18.207: E/AndroidRuntime(3360): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.rssreader/com.example.rssreader.MainActivity}: android.os.NetworkOnMainThreadException 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1967) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1992) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.ActivityThread.access$600(ActivityThread.java:127) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1158) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.os.Handler.dispatchMessage(Handler.java:99) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.os.Looper.loop(Looper.java:137) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.ActivityThread.main(ActivityThread.java:4441) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at java.lang.reflect.Method.invokeNative(Native Method) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at java.lang.reflect.Method.invoke(Method.java:511) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at dalvik.system.NativeStart.main(Native Method) 
09-19 09:49:18.207: E/AndroidRuntime(3360): Caused by: android.os.NetworkOnMainThreadException 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1108) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.io.IoBridge.connectErrno(IoBridge.java:133) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.io.IoBridge.connect(IoBridge.java:118) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at java.net.Socket.connect(Socket.java:849) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:77) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpConnection.connect(HttpConnection.java:117) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpEngine.connect(HttpEngine.java:303) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at com.example.rssreader.MainActivity.getInputStream(MainActivity.java:108) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at com.example.rssreader.MainActivity.onCreate(MainActivity.java:57) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.Activity.performCreate(Activity.java:4465) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931) 
09-19 09:49:18.207: E/AndroidRuntime(3360):  ... 11 more 

J'espère que peut-être certains d'entre vous peuvent m'aider!

Answer 1

Il y a deux solutions de ce problème.

1) N'écrivez pas d'appel réseau dans le thread principal de l'interface utilisateur, utilisez la tâche asynchrone pour cela.

2) Écrivez le code ci-dessous dans votre fichier MainActivity après setContentView (R.layout.activity_main);

if (android.os.Build.VERSION.SDK_INT > 9) { 
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); 
    StrictMode.setThreadPolicy(policy); 
} 

Answer 2

Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10111 nor current process has android.permission.ACCESS_NETWORK_STATE. 

Ajouter permision le:

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />