检测安卓手机是否已经Root

/** * 反编译支付宝SDK得到的判断root的方法，并增加了对‘/su/bin/’目录的判断 * Created by cyb on 2016/12/15 0015. */public class SystemInfo {    public static boolean isRooted(){        // nexus 5x "/su/bin/"        String[] paths = { "/system/xbin/", "/system/bin/", "/system/sbin/", "/sbin/", "/vendor/bin/", "/su/bin/" };        try{            for(int i = 0; i < paths.length; i++){                String path = paths[i] + "su";                if(new File(path).exists()){                    String execResult = exec(new String[] { "ls", "-l", path });                    Log.d("cyb", "isRooted=" + execResult);                    if(TextUtils.isEmpty(execResult) || execResult.indexOf("root") == execResult.lastIndexOf("root")){                        return false;                    }                    return true;                }            }        }catch (Exception e){            e.printStackTrace();        }        return false;    }    private static String exec(String[] exec){        String ret = "";        ProcessBuilder processBuilder = new ProcessBuilder(exec);        try {            Process process = processBuilder.start();            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(process.getInputStream()));            String line;            while( (line = bufferedReader.readLine()) != null){                ret += line;            }            process.getInputStream().close();            process.destroy();        } catch (Exception e) {            e.printStackTrace();        }        return ret;    }}