Add a fading when switching profiles

src/main/res/drawable/background_profile.xml

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <layer-list xmlns:android="http://schemas.android.com/apk/res/android">
     <item>
-        <selector>
+        <selector android:enterFadeDuration="@android:integer/config_mediumAnimTime"
+                  android:exitFadeDuration="@android:integer/config_mediumAnimTime">
             <item android:state_selected="true">
                 <shape android:shape="rectangle">
                     <solid android:color="@color/material_green_700" />

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

@@ -155,7 +155,7 @@ final class ProfilesFragment extends ToolbarFragment with Toolbar.OnMenuItemClic
       val old = app.profileId
       app.switchProfile(item.id)
       profilesAdapter.refreshId(old)
-      bind(item)
+      itemView.setSelected(true)
       if (activity.state == State.CONNECTED) activity.bgService.use(item.id)  // reconnect to new profile
     }