Error parsing xml file Android

Question

I've added a check of the version to my application through xml parsing.

But when I try to execute it, it runs in the exception that I've pasted down there:

11-03 19:21:36.809: E/AndroidRuntime(16531): FATAL EXCEPTION: main
11-03 19:21:36.809: E/AndroidRuntime(16531): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.lookedpath.firstlesson/com.lookedpath.firstlesson.Update}: android.os.NetworkOnMainThreadException
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2099)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2210)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.app.ActivityThread.access$600(ActivityThread.java:142)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1208)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.os.Handler.dispatchMessage(Handler.java:99)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.os.Looper.loop(Looper.java:137)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.app.ActivityThread.main(ActivityThread.java:4931)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at java.lang.reflect.Method.invokeNative(Native Method)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at java.lang.reflect.Method.invoke(Method.java:511)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at dalvik.system.NativeStart.main(Native Method)
11-03 19:21:36.809: E/AndroidRuntime(16531): Caused by: android.os.NetworkOnMainThreadException
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at com.lookedpath.firstlesson.XMLParser.getXmlFromUrl(XMLParser.java:35)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at com.lookedpath.firstlesson.Update.<init>(Update.java:24)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at java.lang.Class.newInstanceImpl(Native Method)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at java.lang.Class.newInstance(Class.java:1319)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
11-03 19:21:36.809: E/AndroidRuntime(16531):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2090)
11-03 19:21:36.809: E/AndroidRuntime(16531):    ... 11 more

You can get the Eclipse project by using GitHub: https://github.com/LookedPath/lookedpath_android_applications/tree/FirstApp/PrimaLezione

What should I do?

Please show the relevant parts of your code. Just linking to a code repository in not enough... — home
– home, Commented Nov 3, 2012 at 18:34

alorma · Accepted Answer · 2012-11-04 18:11:27Z

3

The best way is use an AsyncTask.

http://developer.android.com/reference/android/os/AsyncTask.html

Async task lets u to interact with the UI when u fiish download, thread (or runnable) don't let you to interact with the UI.

If u need to make changes in your UI, you needs to create a handler and run changes in that handler, but AsyncTask implements it for you.

answered Nov 4, 2012 at 18:11

alorma

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Comments

Techwolf · Accepted Answer · 2012-11-03 18:46:05Z

0

You are getting a NetworkOnMainThreadException. That means you're trying to access the network in some way (downloading an image, for example) in your main (UI) thread. This was disabled for better responsiveness to the user interface in API 11. You need to use a different thread for your networking, the easiest way to implement this is with an AsyncTask. If you need to remain connected for a while (for something such as live communication), your could also create a new class which extends Thread or HandlerThreadand manage communication between that and the UI thread yourself (with Handler). Don't forget the UI is not thread-safe.

answered Nov 3, 2012 at 18:46

Techwolf

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6 Comments

LookedPath Over a year ago

I changed my Update.java with this: pastebin.com/LUQp64us But i got a strange error: "Skipped xx frames! the application may be doing too much work on its main thread" like if the app generated a lot of load for the cpu...

Techwolf Over a year ago

Try putting connect() into the AsyncTask's class instead of your main one and see if that helps.

LookedPath Over a year ago

the errors are gone but the applications opens a blank layout instead of updating the textview as it is supposed to do...

Techwolf Over a year ago

The android UI is not thread-safe, so you can only update your TextView from the main thread. You should use onPostExecute() in the AsyncTask to update it, since that runs on the UI thread. It is passed whatever is returned from doInBackground().

LookedPath Over a year ago

Ok thanks for your help... Now i completely rewrote the Update class but I'm still getting an exception when i launch goToUpdate void... MainActivity.java: pastebin.com/9HYH5hfi Update.java: pastebin.com/ukzX2sYb XMLParser.java: pastebin.com/2MuNmfp6 Exception: pastebin.com/fcNj0i1q

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