java.lang.RuntimeException：java.net.UnknownHostException：主机未解析：

Question

I am having a problem while parsing XML file,i used newsRSS parser as a reference.but i am getting this error in the real device.how to display an error message like alert for the user and let him stay on the app without crashing?

this is the peace of the code that do the connection and parsing:

protected Config_Parser(String feedUrlString,Context context){
  this.context = context;
  try {
    this.feedUrl = new URL(feedUrlString);
  } catch (MalformedURLException e) {
    throw new RuntimeException(e);
  }
}
protected InputStream getInputStream() {
  try {
    return feedUrl.openConnection().getInputStream();
  } catch (IOException e) {
    Log.e("Error", "error happned");
    return null;
    //throw new RuntimeException(e);
  }
}

how may i handle this error with sending alert to the user without crashing or exiting the application?

Thanks for help :)

Answer 1

如果这在emulator而不是在device ，则很可能是因为您的device上没有InternetConnection ，或者您尝试访问的Feed URL也无法从device所连接的Network访问。

Answer 2

i already has this problem , the host is unresolved means that the url is unreachable , or your connection is tooo Sloow . try to test your programm with another Internet Connexion which has a good Bandwidth :

Also , check that your Emulator display the icon of 3G .