/**
     * 判斷當前手機是否有ROOT許可權
     * @return
     */
    public boolean isRoot(){
        boolean bool = false;

        try{
            if ((!new File("/system/bin/su").exists()) && (!new File("/system/xbin/su").exists())){
                bool = false;
            } else {
                bool = true
 
;
            }
            Log.d(TAG, "bool = " + bool);
        } catch (Exception e) {

        } 
        return bool;
    }