diff --git a/.travis.yml b/.travis.yml
index a9a15ed4..469233a1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ jdk:
 
 env:
     global:
-        - NDK_VERSION=r14
+        - NDK_VERSION=r15-beta2
         - NDK_CCACHE=ccache
         - GOROOT_BOOTSTRAP=$GOROOT
         - ANDROID_NDK_HOME=$HOME/.android/android-ndk-${NDK_VERSION}
diff --git a/build.sbt b/build.sbt
index ff88b127..5f6450c5 100644
--- a/build.sbt
+++ b/build.sbt
@@ -18,10 +18,12 @@ lazy val commonSettings = Seq(
   shrinkResources := true,
   typedResources := false,
 
-  resConfigs := Seq("ja", "ko", "ru", "zh-rCN", "zh-rTW")
+  resConfigs := Seq("ja", "ko", "ru", "zh-rCN", "zh-rTW"),
+
+  resolvers += "google" at "https://maven.google.com"
 )
 
-val supportLibsVersion = "26.0.0-alpha1"
+val supportLibsVersion = "26.0.0-beta1"
 lazy val root = Project(id = "shadowsocks-android", base = file("."))
   .settings(commonSettings)
   .aggregate(plugin, mobile)
diff --git a/mobile/src/main/res/values/strings.xml b/mobile/src/main/res/values/strings.xml
index 594b7fc7..0d937680 100644
--- a/mobile/src/main/res/values/strings.xml
+++ b/mobile/src/main/res/values/strings.xml
@@ -56,7 +56,8 @@
   <string name="udp_dns_summary">Forward all DNS requests to remote</string>
 
   <!-- notification category -->
-  <string name="service">Service</string>
+  <string name="service_vpn">VPN Service</string>
+  <string name="service_nat">NAT Service</string>
   <string name="forward_success">Shadowsocks started.</string>
   <string name="invalid_server">Invalid server name</string>
   <string name="service_failed">Failed to connect the remote server</string>
diff --git a/mobile/src/main/scala/com/github/shadowsocks/BaseService.scala b/mobile/src/main/scala/com/github/shadowsocks/BaseService.scala
index b9a8ac02..30e4b977 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/BaseService.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/BaseService.scala
@@ -30,6 +30,7 @@ import java.net.Inet6Address
 import android.app.Service
 import android.content.{BroadcastReceiver, Context, Intent, IntentFilter}
 import android.os.{Handler, IBinder, RemoteCallbackList}
+import android.support.v4.os.BuildCompat
 import android.text.TextUtils
 import android.util.Log
 import android.widget.Toast
@@ -65,6 +66,7 @@ trait BaseService extends Service {
   lazy val handler = new Handler(getMainLooper)
   lazy val restartHanlder = new Handler(getMainLooper)
 
+  private var notification: ShadowsocksNotification = _
   private val closeReceiver: BroadcastReceiver = (context: Context, _: Intent) => {
     Toast.makeText(context, R.string.stopping, Toast.LENGTH_SHORT).show()
     stopRunner(stopService = true)
@@ -160,10 +162,12 @@ trait BaseService extends Service {
     pluginPath = PluginManager.init(plugin)
   }
 
+  def createNotification(): ShadowsocksNotification
   def startRunner(profile: Profile) {
     this.profile = profile
 
-    startService(new Intent(this, getClass))
+    if (BuildCompat.isAtLeastO) startForegroundService(new Intent(this, getClass))
+    else startService(new Intent(this, getClass))
     TrafficMonitor.reset()
     trafficMonitorThread = new TrafficMonitorThread(getApplicationContext)
     trafficMonitorThread.start()
@@ -177,6 +181,7 @@ trait BaseService extends Service {
       closeReceiverRegistered = true
     }
 
+    notification = createNotification()
     app.track(getClass.getSimpleName, "start")
 
     changeState(State.CONNECTING)
@@ -198,6 +203,8 @@ trait BaseService extends Service {
       closeReceiverRegistered = false
     }
 
+    if (notification != null) notification.destroy()
+
     // Make sure update total traffic when stopping the runner
     updateTrafficTotal(TrafficMonitor.txTotal, TrafficMonitor.rxTotal)
 
diff --git a/mobile/src/main/scala/com/github/shadowsocks/MainActivity.scala b/mobile/src/main/scala/com/github/shadowsocks/MainActivity.scala
index 3374eda8..b3aae6e0 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/MainActivity.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/MainActivity.scala
@@ -256,7 +256,7 @@ class MainActivity extends Activity with ServiceBoundContext with Drawer.OnDrawe
     txRateText = findViewById(R.id.txRate).asInstanceOf[TextView]
     rxText = findViewById(R.id.rx).asInstanceOf[TextView]
     rxRateText = findViewById(R.id.rxRate).asInstanceOf[TextView]
-    findViewById(R.id.stat).setOnClickListener(_ => if (state == State.CONNECTED && app.isVpnEnabled) {
+    findViewById[View](R.id.stat).setOnClickListener(_ => if (state == State.CONNECTED && app.isVpnEnabled) {
       testCount += 1
       statusText.setText(R.string.connection_test_testing)
       val id = testCount  // it would change by other code
diff --git a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksApplication.scala b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksApplication.scala
index 4dd063a6..72f8b006 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksApplication.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksApplication.scala
@@ -44,6 +44,7 @@ import com.j256.ormlite.logger.LocalLog
 import eu.chainfire.libsuperuser.Shell
 
 import scala.collection.mutable.ArrayBuffer
+import scala.collection.JavaConversions._
 
 object ShadowsocksApplication {
   var app: ShadowsocksApplication = _
@@ -156,8 +157,10 @@ class ShadowsocksApplication extends Application {
 
     TcpFastOpen.enabled(settings.getBoolean(Key.tfo, TcpFastOpen.sendEnabled))
 
-    if (BuildCompat.isAtLeastO) getSystemService(classOf[NotificationManager]).createNotificationChannel(
-      new NotificationChannel("service", getText(R.string.service), NotificationManager.IMPORTANCE_MIN))
+    if (BuildCompat.isAtLeastO) getSystemService(classOf[NotificationManager]).createNotificationChannels(List(
+      new NotificationChannel("service-vpn", getText(R.string.service_vpn), NotificationManager.IMPORTANCE_MIN),
+      new NotificationChannel("service-nat", getText(R.string.service_nat), NotificationManager.IMPORTANCE_LOW)
+    ))
   }
 
   def crashRecovery() {
diff --git a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNatService.scala b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNatService.scala
index d5855834..a71ea95d 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNatService.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNatService.scala
@@ -43,7 +43,6 @@ class ShadowsocksNatService extends BaseService {
   val CMD_IPTABLES_DNAT_ADD_SOCKS =
     "iptables -t nat -A OUTPUT -p tcp -j DNAT --to-destination 127.0.0.1:8123"
 
-  private var notification: ShadowsocksNotification = _
   val myUid: Int = android.os.Process.myUid()
 
   var sslocalProcess: GuardedProcess = _
@@ -204,12 +203,11 @@ class ShadowsocksNatService extends BaseService {
       AclSyncJob.schedule(profile.route)
 
     changeState(State.CONNECTED)
-    notification = new ShadowsocksNotification(this, profile.name, true)
   }
 
-  override def stopRunner(stopService: Boolean, msg: String = null) {
+  override def createNotification() = new ShadowsocksNotification(this, profile.name, "service-nat", true)
 
-    if (notification != null) notification.destroy()
+  override def stopRunner(stopService: Boolean, msg: String = null) {
 
     // channge the state
     changeState(State.STOPPING)
diff --git a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNotification.scala b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNotification.scala
index 9fc38fc9..7ca79437 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNotification.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksNotification.scala
@@ -35,7 +35,8 @@ import com.github.shadowsocks.utils.{Action, State, TrafficMonitor, Utils}
 /**
   * @author Mygod
   */
-class ShadowsocksNotification(private val service: BaseService, profileName: String, visible: Boolean = false) {
+class ShadowsocksNotification(private val service: BaseService, profileName: String,
+                              channel: String, visible: Boolean = false) {
   private val keyGuard = service.getSystemService(Context.KEYGUARD_SERVICE).asInstanceOf[KeyguardManager]
   private lazy val nm = service.getSystemService(Context.NOTIFICATION_SERVICE).asInstanceOf[NotificationManager]
   private lazy val callback = new Stub {
@@ -61,7 +62,7 @@ class ShadowsocksNotification(private val service: BaseService, profileName: Str
     .setContentIntent(PendingIntent.getActivity(service, 0, new Intent(service, classOf[MainActivity])
       .setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT), 0))
     .setSmallIcon(R.drawable.ic_stat_shadowsocks)
-    .setChannel("service")
+    .setChannel(channel)
   if (Build.VERSION.SDK_INT < 24) builder.addAction(R.drawable.ic_navigation_close,
     service.getString(R.string.stop), PendingIntent.getBroadcast(service, 0, new Intent(Action.CLOSE), 0))
   private lazy val style = new BigTextStyle(builder)
@@ -99,9 +100,7 @@ class ShadowsocksNotification(private val service: BaseService, profileName: Str
     show()
   } else if (forceShow) show()
 
-  def show(): Unit =
-    if (BuildCompat.isAtLeastO) nm.startServiceInForeground(new Intent(service, service.getClass), 1, builder.build())
-    else service.startForeground(1, builder.build)
+  def show(): Unit = service.startForeground(1, builder.build)
 
   def destroy() {
     if (lockReceiver != null) {
diff --git a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksVpnService.scala b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksVpnService.scala
index 81ac83ee..5e4d1e34 100644
--- a/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksVpnService.scala
+++ b/mobile/src/main/scala/com/github/shadowsocks/ShadowsocksVpnService.scala
@@ -42,7 +42,6 @@ class ShadowsocksVpnService extends VpnService with BaseService {
   val PRIVATE_VLAN6 = "fdfe:dcba:9876::%s"
   var conn: ParcelFileDescriptor = _
   var vpnThread: ShadowsocksVpnThread = _
-  private var notification: ShadowsocksNotification = _
 
   var sslocalProcess: GuardedProcess = _
   var overtureProcess: GuardedProcess = _
@@ -69,8 +68,6 @@ class ShadowsocksVpnService extends VpnService with BaseService {
       vpnThread = null
     }
 
-    if (notification != null) notification.destroy()
-
     // channge the state
     changeState(State.STOPPING)
 
@@ -117,6 +114,8 @@ class ShadowsocksVpnService extends VpnService with BaseService {
     super.startRunner(profile)
   }
 
+  override def createNotification() = new ShadowsocksNotification(this, profile.name, "service-vpn")
+
   override def connect() {
     super.connect()
 
@@ -137,8 +136,6 @@ class ShadowsocksVpnService extends VpnService with BaseService {
 
     if (profile.route != Acl.ALL && profile.route != Acl.CUSTOM_RULES)
       AclSyncJob.schedule(profile.route)
-
-    notification = new ShadowsocksNotification(this, profile.name)
   }
 
   /** Called when the activity is first created. */