How to Ping External IP from Java Android

Question

I am developing a Ping application for Android 2.2.

I try my code and it works, but only in local IPs, that's 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 following line at Manifest XML too:

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

Can anyone suggest me where I'm doing wrong?

Answer 1

I tried following code, which works for 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;     }