fix an issue

src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.shadowsocks"
-    android:versionCode="70"
-    android:versionName="2.2.2">
+    android:versionCode="71"
+    android:versionName="2.2.3">
 
   <uses-permission android:name="android.permission.INTERNET"/>
   <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

src/main/scala/com/github/shadowsocks/Shadowsocks.scala

@@ -213,6 +213,8 @@ class Shadowsocks
         setPreferenceEnabled(enabled = false)
       }
       state = bgService.getState
+      // set the listener
+      switchButton.setOnCheckedChangeListener(Shadowsocks.this)
     }
 
     override def onServiceDisconnected(name: ComponentName) {
@@ -746,9 +748,9 @@ class Shadowsocks
           changeSwitch(checked = false)
       }
       state = bgService.getState
+      // set the listener
+      switchButton.setOnCheckedChangeListener(Shadowsocks.this)
     }
-    // set the listener
-    switchButton.setOnCheckedChangeListener(Shadowsocks.this)
     ConfigUtils.refresh(this)
   }
 

src/main/scala/com/github/shadowsocks/ShadowsocksNatService.scala

@@ -565,6 +565,7 @@ class ShadowsocksNatService extends Service with BaseService {
       unregisterReceiver(receiver)
       receiver = null
     }
+
     stopForegroundCompat(1)
   }