How to Ping External Ip from Java Android

Question

Hi I am developing a Ping application for Android 2.2.

I try my code and works Ok but only in local Ips, thats my problem i want to do ping to external servers too. Here is my 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 the followiing line at Manifest XML too:

  </application>

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

</manifest> 

Any help ??? Thank You :)

Answer 1

Maybe ICMP packets are blocked by your (mobile) provider. If this code doesn't work on the emulator try to sniff via wireshark or any other sniffer and have a look whats up on the wire when you fire the isReachable() method.

You may also find some info in your device log.