android ping 命令获取连接速度

public class {
    
     * @param address 地址
     * @return 根据地址，返回该地址ping速度，如果不可用，返回-1f
     */
    private static float getSpeed(String address) {

        address = address.replace("http://", "");
        address = address.replace("https://", "");
        address = address.replace("/", "");

        float retVal = -1f;
        try {
            Runtime runtime = Runtime.getRuntime();

            Process process = runtime.exec("/system/bin/ping -c " + 5 + " " + address);

            int status = process.waitFor();

            if (status != 0) {
                //ping 失败
                return -1f;
            }

            BufferedReader buf = new BufferedReader(new InputStreamReader(process.getInputStream()));

            String str;
            //读出所有信息并显示
            StringBuilder sb = new StringBuilder();

            while ((str = buf.readLine()) != null) {
                sb.append(str);
            }

            String result = sb.toString();

            int lastIndexOf = result.lastIndexOf('/');
            if (lastIndexOf != -1) {
                try {
                    result = result.substring(lastIndexOf + 1);
                    result = result.replaceAll("ms", "");
                    result = result.replaceAll(" ", "");

                    retVal = Float.valueOf(result);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            buf.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return retVal;
    }
}