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PORSS reader issue for Android
 

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  1. PORSS reader issue for Android
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    <p>I am trying to read RSS feeds from a website and display them on my app in android. However, I am running into errors. Any ideas? i will post my logcat after the code. Please help.</p> <pre><code>package nidhin.rss; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.List; import org.xmlpull.v1.XmlPullParser; import org.xmlpull.v1.XmlPullParserException; import org.xmlpull.v1.XmlPullParserFactory; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class RssActivity extends Activity { /** Called when the activity is first created. */ Button ButtonStats ; List headlines; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ButtonStats = (Button) findViewById(R.id.ButtonStats); ButtonStats.setOnClickListener(new clicker()); headlines = new ArrayList(); try { URL url = new URL("http://feeds.pcworld.com/pcworld/latestnews"); XmlPullParserFactory factory = XmlPullParserFactory.newInstance(); factory.setNamespaceAware(false); XmlPullParser xpp = factory.newPullParser(); xpp.setInput(getInputStream(url), "UTF_8"); boolean insideItem = false; 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(eventType==XmlPullParser.END_TAG &amp;&amp; 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(); } } public InputStream getInputStream(URL url) { try { return url.openConnection().getInputStream(); } catch (IOException e) { return null; } } class clicker implements Button.OnClickListener { public void onClick(View v) { if(v== ButtonStats) { } } } } </code></pre> <p>Logcat:</p> <pre><code>08-02 21:40:02.320: E/AndroidRuntime(723): FATAL EXCEPTION: main 08-02 21:40:02.320: E/AndroidRuntime(723): java.lang.RuntimeException: Unable to start activity ComponentInfo{nidhin.rss/nidhin.rss.RssActivity}: android.os.NetworkOnMainThreadException 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.ActivityThread.access$600(ActivityThread.java:123) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.os.Handler.dispatchMessage(Handler.java:99) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.os.Looper.loop(Looper.java:137) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.ActivityThread.main(ActivityThread.java:4424) 08-02 21:40:02.320: E/AndroidRuntime(723): at java.lang.reflect.Method.invokeNative(Native Method) 08-02 21:40:02.320: E/AndroidRuntime(723): at java.lang.reflect.Method.invoke(Method.java:511) 08-02 21:40:02.320: E/AndroidRuntime(723): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 08-02 21:40:02.320: E/AndroidRuntime(723): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 08-02 21:40:02.320: E/AndroidRuntime(723): at dalvik.system.NativeStart.main(Native Method) 08-02 21:40:02.320: E/AndroidRuntime(723): Caused by: android.os.NetworkOnMainThreadException 08-02 21:40:02.320: E/AndroidRuntime(723): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099) 08-02 21:40:02.320: E/AndroidRuntime(723): at java.net.InetAddress.lookupHostByName(InetAddress.java:391) 08-02 21:40:02.320: E/AndroidRuntime(723): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:242) 08-02 21:40:02.320: E/AndroidRuntime(723): at java.net.InetAddress.getAllByName(InetAddress.java:220) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpConnection.&lt;init&gt;(HttpConnection.java:71) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpConnection.&lt;init&gt;(HttpConnection.java:50) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:351) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:86) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:308) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpEngine.connect(HttpEngine.java:303) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:282) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:232) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273) 08-02 21:40:02.320: E/AndroidRuntime(723): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168) 08-02 21:40:02.320: E/AndroidRuntime(723): at nidhin.rss.RssActivity.getInputStream(RssActivity.java:107) 08-02 21:40:02.320: E/AndroidRuntime(723): at nidhin.rss.RssActivity.onCreate(RssActivity.java:47) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.Activity.performCreate(Activity.java:4465) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 08-02 21:40:02.320: E/AndroidRuntime(723): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920) 08-02 21:40:02.320: E/AndroidRuntime(723): ... 11 more </code></pre>
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    1. USNidhin_toms
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    1. COYou should really try to research your own problems. Instead of expecting to be spoonfed the answer on stackoverflow. Learn to analyze your logs, this is a very important skill.
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      1. USJoxTraex
    2. COthe problem was that my android was running on 4.0 . I wrote the same code on android 1.5 and it worked properly.
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      1. PORSS reader issue for Android
      1. USNidhin_toms
    3. CO@Nidhin_toms starting with 3.0 making network calls on the main thread will raise an exception. Although changing your API level to a lower one will technically "fix" this, the correct way to do is use Thread/Handler or AsyncTask to move your network operation off of the main thread. Which will also result in a better user experience, and eliminate the chance of ANR force close.
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      1. PORSS reader issue for Android
      1. USFoamyGuy
 

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