android - 如何在Android中ping服务器？

Question

如何在 Android 中 ping 一些 Web 服务器以测试我是否有 Internet 连接？所以我需要 ping 给定站点的方法，如果我没有 Internet，则返回 false，如果有，则返回 true。

Answer 1

请参阅此方法，这是检查与给定服务器的连接性的最佳方法：

http://developer.android.com/reference/java/net/InetAddress.html#isReachable(int)

Answer 2

使用这些方法 ping 服务器

public static void inSomeWhere()
    {
        String pingResult = getPingResult("168.126.63.1");
        boolean isNetOk = true;
        if (pingResult == null) {
            // not reachable!!!!!
            isNetOk = false;
        }

    }


    public static String getPingResult(String a) {
        String str = "";
        String result = "";
        BufferedReader reader = null;
        char[] buffer = new char[4096];
        StringBuffer output = new StringBuffer();

        try {
            Runtime r = Runtime.getRuntime();
            Process process = r.exec("/system/bin/ping -c 3 " + a);
            reader = new BufferedReader(new InputStreamReader(process.getInputStream()));

            int i;

            while ((i = reader.read(buffer)) > 0)
                output.append(buffer, 0, i);


            str = output.toString();

            final String[] b = str.split("---");
            final String[] c = b[2].split("rtt");

            if (b.length == 0 || c.length == 0)
                return null;

            if(b.length == 1 || c.length == 1)
                return null;

            result = b[1].substring(1, b[1].length()) + c[0] + c[1].substring(1, c[1].length());

        } catch (IOException e) {
            return null;
        } catch (Exception e) {
            return null;
        }
        finally
        {
            if(reader != null)
            {
                try{reader.close();}catch(IOException ie){}
            }
        }

        return result;
    }