Merge pull request #169

* 修复 隐藏网速单位 & 随便精简了下代码

* Update SettingsActivity.kt

app/src/main/java/com/lt2333/simplicitytools/util/SystemProperties.kt

@@ -1,21 +1,23 @@
 package com.lt2333.simplicitytools.util
 
+import android.annotation.SuppressLint
 import android.content.Context
 
 object SystemProperties {
+    @SuppressLint("PrivateApi")
     operator fun get(context: Context, key: String?): String? {
         var ret = ""
         try {
             val cl = context.classLoader
-            val SystemProperties = cl.loadClass("android.os.SystemProperties")
+            val systemProperties = cl.loadClass("android.os.SystemProperties")
             //参数类型
             val paramTypes: Array<Class<*>?> = arrayOfNulls(1)
             paramTypes[0] = String::class.java
-            val get = SystemProperties.getMethod("get", *paramTypes)
+            val get = systemProperties.getMethod("get", *paramTypes)
             //参数
             val params = arrayOfNulls<Any>(1)
             params[0] = key
-            ret = get.invoke(SystemProperties, *params) as String
+            ret = get.invoke(systemProperties, *params) as String
         } catch (iAE: IllegalArgumentException) {
             throw iAE
         } catch (e: Exception) {
@@ -23,4 +25,5 @@ object SystemProperties {
         }
         return ret
     }
+
 }