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)
+    }
 }
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/contract/MainContract.kt b/app/src/main/kotlin/jackall/overlaymulticounter/contract/MainContract.kt
new file mode 100644
index 0000000..ba3d588
--- /dev/null
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/contract/MainContract.kt
@@ -0,0 +1,10 @@
+package jackall.overlaymulticounter.contract
+
+/**
+ * Created by matsumoto_k on 2017/11/10.
+ */
+interface MainContract {
+    fun openSetting()
+    fun startService()
+    fun stopService()
+}
\ No newline at end of file
diff --git a/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt b/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
index 6955adc..436f8b1 100644
--- a/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
+++ b/app/src/main/kotlin/jackall/overlaymulticounter/viewmodel/MainViewModel.kt
@@ -20,6 +20,7 @@
 import jackall.overlaymulticounter.R
 import jackall.overlaymulticounter.adapter.CounterAdapter
 import jackall.overlaymulticounter.contract.CounterContract
+import jackall.overlaymulticounter.contract.MainContract
 import jackall.overlaymulticounter.db.CounterRealmHelper
 import jackall.overlaymulticounter.service.MainService
 import jackall.overlaymulticounter.utils.AdUtil
@@ -31,7 +32,7 @@
 /**
  * Created by matsumoto_k on 2017/11/10.
  */
-class MainViewModel : LifecycleViewModel(), LifecycleObserver, CounterContract {
+class MainViewModel(val contract: MainContract) : LifecycleViewModel(), LifecycleObserver, CounterContract {
     var counterAdapter: CounterAdapter
     var counterRealmHelper = CounterRealmHelper()
     var realmChangeListener: OrderedRealmCollectionChangeListener<RealmResults<Counter>>
@@ -59,19 +60,15 @@
         if (RuntimePermissionUtil.checkOverlayPermission(view.context)) {
             AdUtil.startInterstitialAd(view.context)
             if (ServiceUtil.isMainServiceRunning(view.context)) {
-                val intent = Intent(view.context, MainService::class.java)
-                view.context.stopService(intent)
+                contract.stopService()
             } else {
-                val intent = Intent(view.context, MainService::class.java)
-                view.context.startService(intent)
-                (view.context as Activity).finish()
+                contract.startService()
             }
         } else {
             AlertDialog.Builder(view.context)
                     .setMessage(view.context.getString(R.string.permit_overlay))
                     .setPositiveButton(view.context.getString(R.string.setting), DialogInterface.OnClickListener { dialog, which ->
-                        val intent = Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:jackall.overlaymulticounter"))
-                        (view.context as Activity).startActivityForResult(intent, 0)
+                        contract.openSetting()
                     })
                     .setNegativeButton(view.context.getString(R.string.cancel), null)
                     .show()
@@ -121,9 +118,9 @@
         counterRealmHelper.close()
     }
 
-    class Factory() : ViewModelProvider.NewInstanceFactory() {
+    class Factory(val contract: MainContract) : ViewModelProvider.NewInstanceFactory() {
         override fun <T : ViewModel?> create(modelClass: Class<T>): T {
-            return MainViewModel() as T
+            return MainViewModel(contract) as T
         }
     }