How to Ping External IP from Java Android -

i developing ping application android 2.2.

i try code , works, in local ips, that's problem want ping external servers too.

here code:

  private onclicklistener milistener = new onclicklistener() {     public void onclick(view v) {         textview info = (textview) findviewbyid(r.id.info);         edittext edit = (edittext) findviewbyid(r.id.edit);         editable host = edit.gettext();         inetaddress in;         in = null;         // definimos la ip de la cual haremos el ping         try {             in = inetaddress.getbyname(host.tostring());         } catch (unknownhostexception e) {             // todo auto-generated catch block             e.printstacktrace();         }         // definimos un tiempo en el cual ha de responder         try {             if (in.isreachable(5000)) {                 info.settext("responde ok");             } else {                 info.settext("no responde: time out");             }         } catch (ioexception e) {             // todo auto-generated catch block             info.settext(e.tostring());         }     } }; 

ping 127.0.0.1 -> ok
ping 8.8.8.8 (google dns) -> time out

i put following line @ manifest xml too:

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

can suggest me i'm doing wrong?

i tried following code, works me.

private boolean executecommand(){         system.out.println("executecommand");         runtime runtime = runtime.getruntime();         try         {             process  mipaddrprocess = runtime.exec("/system/bin/ping -c 1 8.8.8.8");             int mexitvalue = mipaddrprocess.waitfor();             system.out.println(" mexitvalue "+mexitvalue);             if(mexitvalue==0){                 return true;             }else{                 return false;             }         }         catch (interruptedexception ignore)         {             ignore.printstacktrace();             system.out.println(" exception:"+ignore);         }          catch (ioexception e)          {             e.printstacktrace();             system.out.println(" exception:"+e);         }         return false;     }