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    lt uses-permission android name  android permission INTERNET  gt  lt  uses-permission gt    Can anyone suggest me where I m doing wrong

User · Answer

To get the boolean value for the hit on the ip   public Boolean getInetAddressByName String name                AsyncTask lt String  Void  Boolean gt  task   new AsyncTask lt String  Void  Boolean gt                            Override             protected Boolean doInBackground String    params                    try                                       return InetAddress getByName params 0   isReachable 2000                                     catch  Exception e                                        return null                                                     try               return task execute name  get                      catch  InterruptedException e                return null                    catch  ExecutionException e                return null

User · Answer

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

User · Answer

Pink ip Address    public static int pingHost String host  int timeout  throws IOException          InterruptedException       Runtime runtime   Runtime getRuntime        timeout    1000      String cmd    ping -c 1 -W     timeout         host      Process proc   runtime exec cmd       Log d TAG  cmd       proc waitFor        int exit   proc exitValue        return exit       Ping a host and return an int value of 0 or 1 or 2 0 success  1 fail       2 error

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Ping for the google server or any other server  public boolean isConecctedToInternet          Runtime runtime   Runtime getRuntime        try           Process ipProcess   runtime exec   system bin ping -c 1 8 8 8 8            int     exitValue   ipProcess waitFor            return  exitValue    0         catch  IOException e             e printStackTrace          catch  InterruptedException e    e printStackTrace          return false

User · Answer

Use this Code  this method works on 4 3  and also for below versions too      try             Process process   null           if Build VERSION SDK INT  lt   16                   shiny APIS                 process   Runtime getRuntime   exec                        system bin ping -w 1 -c 1     url                        else                                process   new ProcessBuilder                     command   system bin ping   url                    redirectErrorStream true                    start                              BufferedReader reader   new BufferedReader new InputStreamReader                  process getInputStream               StringBuffer output   new StringBuffer            String temp           while    temp   reader readLine       null    read buffer    gt  0                        output append temp               count                       reader close              if count  gt  0              str   output toString             process destroy           catch  IOException e             e printStackTrace               Log i  PING Count      count       Log i  PING String   str

User · Answer

Run the ping utility in Android s command and parse output  assuming you have root permissions   See the following Java code snippet   executeCmd  ping -c 1 -w 1 google com   false    public static String executeCmd String cmd  boolean sudo       try            Process p          if  sudo              p  Runtime getRuntime   exec cmd           else              p  Runtime getRuntime   exec new String    su    -c   cmd                      BufferedReader stdInput   new BufferedReader new InputStreamReader p getInputStream               String s          String res               while   s   stdInput readLine       null                res    s     n                     p destroy            return res        catch  Exception e            e printStackTrace              return

User · Answer

In my case ping works from device but not from the emulator  I found this documentation  http   developer android com guide developing devices emulator html emulatornetworking  On the topic of  Local Networking Limitations  it says       Depending on the environment  the emulator may not be able to support   other protocols  such as ICMP  used for  ping   might not be   supported  Currently  the emulator does not support IGMP or   multicast     Further information  http   groups google com group android-developers browse thread thread 8657506be6819297     this is a known limitation of the QEMU user-mode network stack    Quoting from  the original doc   Note that ping is not supported   reliably to the internet as it would require  root privileges  It   means you can only ping the local router  10 0 2 2

User · Answer

This is what I implemented myself  which returns the average latency      Returns the latency to a given server in mili-seconds by issuing a ping command  system will issue NUMBER OF PACKTETS ICMP Echo Request packet each having size of 56 bytes every second  and returns the avg latency of them  Returns 0 when there is no connection     public double getLatency String ipAddress       String pingCommand     system bin ping -c     NUMBER OF PACKTETS         ipAddress      String inputLine           double avgRtt   0       try              execute the command on the environment interface         Process process   Runtime getRuntime   exec pingCommand              gets the input stream to get the output of the executed command         BufferedReader bufferedReader   new BufferedReader new InputStreamReader process getInputStream               inputLine   bufferedReader readLine            while   inputLine    null                 if  inputLine length    gt  0  amp  amp  inputLine contains  avg          when we get to the last line of executed ping command                 break                            inputLine   bufferedReader readLine                        catch  IOException e           Log v DEBUG TAG   getLatency  EXCEPTION            e printStackTrace                  Extracting the average round trip time from the inputLine string     String afterEqual   inputLine substring inputLine indexOf       inputLine length    trim        String afterFirstSlash   afterEqual substring afterEqual indexOf        1  afterEqual length    trim        String strAvgRtt   afterFirstSlash substring 0  afterFirstSlash indexOf            avgRtt   Double valueOf strAvgRtt        return avgRtt

User · Answer

I implemented  ping  in pure Android Java and hosted it on gitlab  It does the same thing as the ping executable  but is much easier to configure   It s has a couple useful features like being able to bind to a given Network   https   github com dburckh AndroidPing

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This is a simple ping I use in one of the projects   public static class Ping       public String net    NO CONNECTION       public String host           public String ip           public int dns   Integer MAX VALUE      public int cnt   Integer MAX VALUE     public static Ping ping URL url  Context ctx        Ping r   new Ping        if  isNetworkConnected ctx             r net   getNetworkType ctx           try               String hostAddress              long start   System currentTimeMillis                hostAddress   InetAddress getByName url getHost    getHostAddress                long dnsResolved   System currentTimeMillis                Socket socket   new Socket hostAddress  url getPort                 socket close                long probeFinish   System currentTimeMillis                r dns    int   dnsResolved - start               r cnt    int   probeFinish - dnsResolved               r host   url getHost                r ip   hostAddress                    catch  Exception ex                Timber e  Unable to ping                        return r     public static boolean isNetworkConnected Context context        ConnectivityManager cm                ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE       NetworkInfo activeNetwork   cm getActiveNetworkInfo        return activeNetwork    null  amp  amp  activeNetwork isConnectedOrConnecting        Nullable public static String getNetworkType Context context        ConnectivityManager cm                ConnectivityManager  context getSystemService Context CONNECTIVITY SERVICE       NetworkInfo activeNetwork   cm getActiveNetworkInfo        if  activeNetwork    null            return activeNetwork getTypeName              return null      Usage  ping new URL  https   www google com 443     this    Result    cnt  100  dns  109  host   www google com   ip   212 188 10 114   net   WIFI

User · Answer

this worked for me  no root Android 6 0  Android Studio  Acatel U3        private boolean Ping String IP       System out println  executeCommand        Runtime runtime   Runtime getRuntime        try               Process  mIpAddrProcess   runtime exec   system bin ping -c 1     IP           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

User · Answer

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

[java] How to Ping External IP from Java Android

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