Force Stop by Error in httpClient.execute(httpPost);
You should remember this.


  From Android 3.x Honeycomb or later, you cannot perform Network IO on
  the UI thread and doing this throws
  android.os.NetworkOnMainThreadException. You must use Asynctask
  .


You have to put your getXmlFromUrl(..) code inside Asynctask method

For more Information Refer this Link
http://developer.android.com/reference/android/os/AsyncTask.html