diff --git a/build.sbt b/build.sbt
index fdc9d4d3..f4669e8e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -43,9 +43,6 @@ libraryDependencies ++=
   "com.google.android.gms" % "play-services-gcm" % "10.0.1" ::
   "com.j256.ormlite" % "ormlite-android" % "5.0" ::
   "com.mikepenz" % "materialdrawer" % "5.8.1" ::
-  "com.mikepenz" % "materialize" % "1.0.0" ::
-  "com.mikepenz" % "iconics-core" % "2.8.0" ::
-  "com.mikepenz" % "fastadapter" % "2.1.0" ::
   "com.twofortyfouram" % "android-plugin-api-for-locale" % "1.0.2" ::
   "dnsjava" % "dnsjava" % "2.1.7" ::
   "eu.chainfire" % "libsuperuser" % "1.0.0.201608240809" ::
diff --git a/src/main/scala/com/github/shadowsocks/MainActivity.scala b/src/main/scala/com/github/shadowsocks/MainActivity.scala
index 6cf843bb..0162dc84 100644
--- a/src/main/scala/com/github/shadowsocks/MainActivity.scala
+++ b/src/main/scala/com/github/shadowsocks/MainActivity.scala
@@ -51,10 +51,6 @@ import com.mikepenz.materialdrawer.model.interfaces.IDrawerItem
 import com.mikepenz.materialdrawer.model.{PrimaryDrawerItem, SecondaryDrawerItem}
 import com.mikepenz.materialdrawer.{Drawer, DrawerBuilder}
 
-trait TrafficCallback {
-  def update(txRate: Long, rxRate: Long, txTotal: Long, rxTotal: Long)
-}
-
 object MainActivity {
   private final val TAG = "ShadowsocksMainActivity"
   private final val REQUEST_CONNECT = 1
@@ -77,8 +73,6 @@ class MainActivity extends Activity with ServiceBoundContext with Drawer.OnDrawe
   var currentProfile = new Profile
   var drawer: Drawer = _
 
-  @volatile var trafficCallback: TrafficCallback = _
-
   private lazy val profilesFragment = new ProfilesFragment()
   private lazy val globalSettingsFragment = new GlobalSettingsFragment()
 
@@ -140,7 +134,8 @@ class MainActivity extends Activity with ServiceBoundContext with Drawer.OnDrawe
     rxText.setText(TrafficMonitor.formatTraffic(rxTotal))
     txRateText.setText(TrafficMonitor.formatTraffic(txRate) + "/s")
     rxRateText.setText(TrafficMonitor.formatTraffic(rxRate) + "/s")
-    if (trafficCallback != null) trafficCallback.update(txRate, rxRate, txTotal, rxTotal)
+    val child = getFragmentManager.findFragmentById(R.id.content).asInstanceOf[ToolbarFragment]
+    if (child != null) child.onTrafficUpdated(txRate, rxRate, txTotal, rxTotal)
   }
 
   def attachServiceCallback(): Unit = attachService(callback)
diff --git a/src/main/scala/com/github/shadowsocks/ProfilesFragment.scala b/src/main/scala/com/github/shadowsocks/ProfilesFragment.scala
index 94b99ceb..1c2440e0 100644
--- a/src/main/scala/com/github/shadowsocks/ProfilesFragment.scala
+++ b/src/main/scala/com/github/shadowsocks/ProfilesFragment.scala
@@ -20,7 +20,6 @@
 
 package com.github.shadowsocks
 
-import android.app.Activity
 import android.content._
 import android.graphics.Typeface
 import android.os.{Build, Bundle, Handler, UserManager}
@@ -33,7 +32,6 @@ import android.support.v7.widget.helper.ItemTouchHelper.SimpleCallback
 import android.view._
 import android.widget.{TextView, Toast}
 import com.github.shadowsocks.ShadowsocksApplication.app
-import com.github.shadowsocks.aidl.IShadowsocksServiceCallback
 import com.github.shadowsocks.database.Profile
 import com.github.shadowsocks.utils.{Action, Parser, TrafficMonitor, Utils}
 import com.github.shadowsocks.widget.UndoSnackbarManager
@@ -214,24 +212,10 @@ final class ProfilesFragment extends ToolbarFragment with OnMenuItemClickListene
     LocalBroadcastManager.getInstance(getActivity).registerReceiver(profilesListener, filter)
   }
 
-  override def onAttach(activity: Activity) {
-    super.onAttach(activity)
-    activity.asInstanceOf[MainActivity].trafficCallback = new TrafficCallback {
-      def update(txRate: Long, rxRate: Long, txTotal: Long, rxTotal: Long): Unit =
-        if (selectedItem != null) selectedItem.updateText(txTotal, rxTotal)
-    }
-  }
-
-  override def onStart() {
-    super.onStart()
-  }
-
-  override def onStop() {
-    super.onStop()
-  }
+  override def onTrafficUpdated(txRate: Long, rxRate: Long, txTotal: Long, rxTotal: Long): Unit =
+    if (selectedItem != null) selectedItem.updateText(txTotal, rxTotal)
 
   override def onDetach() {
-    getActivity.asInstanceOf[MainActivity].trafficCallback = null
     undoManager.flush()
     super.onDetach()
   }
diff --git a/src/main/scala/com/github/shadowsocks/ToolbarFragment.scala b/src/main/scala/com/github/shadowsocks/ToolbarFragment.scala
index 8cc554ea..7a80e0cb 100644
--- a/src/main/scala/com/github/shadowsocks/ToolbarFragment.scala
+++ b/src/main/scala/com/github/shadowsocks/ToolbarFragment.scala
@@ -14,4 +14,6 @@ class ToolbarFragment extends Fragment {
     val activity = getActivity.asInstanceOf[MainActivity]
     activity.drawer.setToolbar(activity, toolbar, true)
   }
+
+  def onTrafficUpdated(txRate: Long, rxRate: Long, txTotal: Long, rxTotal: Long): Unit = ()
 }