diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
index 1c360ef..48111e0 100644
--- a/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/activity/MainActivity.kt
@@ -1,9 +1,12 @@
 package jackall.overlaymulticounter.activity
 
 import android.arch.lifecycle.ViewModelProviders
+import android.content.Intent
 import android.databinding.DataBindingUtil
 import android.graphics.Typeface
+import android.net.Uri
 import android.os.Bundle
+import android.provider.Settings
 import android.support.v7.app.AppCompatActivity
 import com.getkeepsafe.taptargetview.TapTarget
 import com.getkeepsafe.taptargetview.TapTargetView
@@ -12,8 +15,10 @@
 import jackall.overlaymulticounter.R
 import jackall.overlaymulticounter.common.PreferenceKeys
 import jackall.overlaymulticounter.common.PreferenceNames
+import jackall.overlaymulticounter.contract.MainContract
 import jackall.overlaymulticounter.databinding.ActivityMainBinding
 import jackall.overlaymulticounter.db.CounterRealmHelper
+import jackall.overlaymulticounter.service.MainService
 import jackall.overlaymulticounter.utils.AdUtil
 import jackall.overlaymulticounter.utils.MySharedPref
 import jackall.overlaymulticounter.viewmodel.MainViewModel
@@ -21,7 +26,7 @@
 import kotlinx.android.synthetic.main.activity_main.view.*
 
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : AppCompatActivity(), MainContract {
 
     lateinit var binding: ActivityMainBinding
     lateinit var mainViewModel: MainViewModel
@@ -30,7 +35,7 @@
         super.onCreate(savedInstanceState)
 
         binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
-        mainViewModel = ViewModelProviders.of(this, MainViewModel.Factory()).get(MainViewModel::class.java)
+        mainViewModel = ViewModelProviders.of(this, MainViewModel.Factory(this as MainContract)).get(MainViewModel::class.java)
         binding.mainViewModel = mainViewModel
         lifecycle.addObserver(mainViewModel)
 
@@ -75,4 +80,17 @@
                     })
         }
     }
+
+    override fun startService() {
+        startService(Intent(this, MainService::class.java))
+    }
+
+    override fun stopService() {
+        stopService(Intent(this, MainService::class.java))
+    }
+
+    override fun openSetting() {
+        val intent = Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:jackall.overlaymulticounter"))
+        startActivityForResult(intent, 0)
+    }
 }