Ping a host in Android:
“ping -c 1 127.0.0.1”
-c 1: The ping times.

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boolean flag = false; Runtime run = Runtime.getRuntime(); Process proc = null; try {proc = run.exec("ping -c 1 127.0.0.1");int result = proc.waitFor(); if (result == 0) { flag = true; } else { flag = false; } } catch (IOException e) { e.printStackTrace(); } catch (InterruptedException e) { e.printStackTrace(); } finally { proc.destroy(); }

Ping codes is simple, but:
1, you must run it in background thread since Process.waitfor() will blocks current thread.
2, And you should control the the execution time for Process.waitfor().

The solutions of above 2 issues could be:
1, AsyncTask to run Process.waitfor() in background;
2, Handler.sendEmptyMessageDelayed() to send a delayed message which cancel the AsyncTask if the background codes running too long time.

Codes in Github.

轉載于:https://www.cnblogs.com/mosthink/p/5288924.html

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