1.将PadInfobean类的string类型设置为可以为空。

app/src/main/java/com/xhly/manageapp/bean/log/PadInfoBean.kt

     /**
      * 设备型号
      */
-    var deviceModel = ""
+    var deviceModel:String?= ""
 
     /**
      * 设备版本
      */
-    var deviceVersion = ""
+    var deviceVersion:String? = ""
 
     /**
      * 设备号
      */
-    var sn = ""
+    var sn:String? = ""
 
     /**
      * WiFi/MAC
      */
-    var wifyMac = ""
+    var wifyMac:String? = ""
 
     /**
      * 蓝牙MAC
      */
-    var blueMac = ""
+    var blueMac:String? = ""
 
     /**
      * 系统内核
      */
-    var sysKernel = ""
+    var sysKernel:String? = ""
 
     /**
      * 设备名称
      */
-    var deviceName = ""
+    var deviceName:String? = ""
 
     /**
      * 是否root：0否1是
     /**
      * 平板ROM版本
      */
-    var romVersion = ""
+    var romVersion:String? = ""
 
     /**
      * SIM序列号
      */
-    var sim = ""
+    var sim:String? = ""
 
     /**
      * 总内存