//獲取手機的唯一標識 public String getPhoneSign(){   StringBuilder deviceId = new StringBuilder();   // 渠道標志   deviceId.append("a");   try {    //IMEI（imei）    TelephonyManager tm = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);    String imei = tm.getDeviceId();    if(!TextUtils.isEmpty(imei)){     deviceId.append("imei");     deviceId.append(imei);     return deviceId.toString();    }    //序列號（sn）    String sn = tm.getSimSerialNumber();    if(!TextUtils.isEmpty(sn)){     deviceId.append("sn");     deviceId.append(sn);     return deviceId.toString();    }    //如果上面都沒有， 則生成一個id：隨機碼    String uuid = getUUID();    if(!TextUtils.isEmpty(uuid)){     deviceId.append("id");     deviceId.append(uuid);     return deviceId.toString();    }   } catch (Exception e) {    e.printStackTrace();    deviceId.append("id").append(getUUID());   }   return deviceId.toString();  }/**  * 得到全局唯一UUID  */ private String uuid; public String getUUID(){  SharedPreferences mShare = getSharedPreferences("uuid",MODE_PRIVATE);  if(mShare != null){   uuid = mShare.getString("uuid", "");  }  if(TextUtils.isEmpty(uuid)){   uuid = UUID.randomUUID().toString();   mShare.edit().putString("uuid",uuid).commit();  }  return uuid; }