android ping

try {
			Process process = Runtime.getRuntime().exec("ping -c 2 -w 100 " + address);
			InputStreamReader r = new InputStreamReader(
					process.getInputStream());
			LineNumberReader returnData = new LineNumberReader(r);

			String returnMsg = "";
			String line = "";

			while ((line = returnData.readLine()) != null) {
				System.out.println(line);
				returnMsg += line;
			}
			// 判断结果中是否有100% loss 有则不连通
			if (returnMsg.indexOf("100% packet loss") != -1||returnMsg.equals("")) {
				System.out.println("与 " + address + " 连接不畅通.");
				return false;
			} else {
				System.out.println("与 " + address + " 连接畅通.");
				return true;
			}
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			return false;
		}