Android执行ping命令检查网络

因为ping要用到网络请求，所以要在AndroidManifest.xml加入网络权限：

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

1、准备好ping命令

将IP或域名和一些参数组合成一条ping命令：

private String spellPing(String ip) {
        String countCmd = " -c 4 ";
        String sizeCmd = " -s 64 ";
        String timeCmd = " -i 1 ";
        return "ping" + countCmd + timeCmd + sizeCmd + ip;

    }

2、执行ping命令

执行ping命令就是通过使用Runtime.getRuntime().exec(ping)。
Runtime.getRuntime().exec()可以执行各种各样的命令。

private void executePingCmd(String pingCmd){
        executorService = Executors.newSingleThreadExecutor();
        executorService.execute(new Thread(new PingTask(pingCmd, pingHandler, 1)));
    }
    
    // 创建ping任务
    private class PingTask implements Runnable {
        private String ping;
        private PingHandler pingHandler;
        private long delay;

        public PingTask(String ping, PingHandler pingHandler, long delay) {
            this.ping = ping;
            this.pingHandler = pingHandler;
            this.delay = delay;
        }

        @Override
        public void run() {
            Process process = null;
            BufferedReader successReader = null;
            BufferedReader errorReader = null;
            try {
                // 执行ping命令
                process = Runtime.getRuntime().exec(ping);
                // success
                successReader = new BufferedReader(new InputStreamReader(process.getInputStream()));
                // error
                errorReader = new BufferedReader(new InputStreamReader(process.getErrorStream()));
                String lineStr;

                while ((lineStr = successReader.readLine()) != null) {

                    // receive
                    Message msg = pingHandler.obtainMessage();
                    msg.obj = lineStr + "\r\n";
                    msg.what = 10;
                    msg.sendToTarget();
                }
                while ((lineStr = errorReader.readLine()) != null) {

                    // receive
                    Message msg = pingHandler.obtainMessage();
                    msg.obj = lineStr + "\r\n";
                    msg.what = 10;
                    msg.sendToTarget();
                }
                Thread.sleep(delay * 1000);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                try {

                    if (successReader != null) {
                        successReader.close();
                    }
                    if (errorReader != null) {
                        errorReader.close();
                    }
                } catch (IOException e) {
                    e.printStackTrace();
                }

                if (process != null) {
                    process.destroy();
                }
            }
        }
    }

3、显示执行结果

通过Handler来通知主线程通知更新UI。

private static class PingHandler extends Handler {
        private WeakReference<MainActivity> weakReference;

        public PingHandler(MainActivity activity) {
            this.weakReference = new WeakReference<>(activity);
        }

        @Override
        public void handleMessage(@NonNull Message msg) {
            switch (msg.what) {
                case 10:
                    // 3、将结果显示出来
                    String resultMsg = (String) msg.obj;
                    weakReference.get().pingAdapter.addString(resultMsg);
                    weakReference.get().mRecylerView.scrollToPosition(weakReference.get().pingAdapter.getItemCount() - 1);
                    break;
                default:
                    break;
            }
        }
    }

​​具体demo已上传到GitHub​​。