diff --git a/app/src/main/kotlin/jackall/moncalc/service/MainService.kt b/app/src/main/kotlin/jackall/moncalc/service/MainService.kt
index 93e0018..475602b 100644
--- a/app/src/main/kotlin/jackall/moncalc/service/MainService.kt
+++ b/app/src/main/kotlin/jackall/moncalc/service/MainService.kt
@@ -1,9 +1,14 @@
 package jackall.moncalc.service
 
 import android.app.Service
+import android.content.Context
 import android.content.Intent
+import android.graphics.PixelFormat
+import android.graphics.Point
+import android.os.Build
 import android.os.IBinder
 import android.support.v4.app.NotificationCompat
+import android.view.*
 import jackall.moncalc.Const
 import jackall.moncalc.R
 
@@ -12,15 +17,95 @@
  */
 class MainService : Service() {
 
+    val overlayView: ViewGroup by lazy { LayoutInflater.from(this).inflate(R.layout.overlay_layout, null) as ViewGroup }
+    val windowManager: WindowManager by lazy { applicationContext.getSystemService(Context.WINDOW_SERVICE) as WindowManager }
+    var params: WindowManager.LayoutParams? = null
+    val displaySize: Point by lazy {
+        val display = windowManager.defaultDisplay
+        val size = Point()
+        display.getSize(size)
+        size
+    }
+    var isLongClick: Boolean = false
+
     override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
         val notificationBuilder = NotificationCompat.Builder(this, Const.serviceChannelId)
                 .setContentTitle("mainService") // TODO:タイトルをセット
                 .setSmallIcon(R.mipmap.ic_launcher) // TODO:白抜きのアイコンをセット
         startForeground(Const.notificationId, notificationBuilder.build())
 
+        setInitOverlayView()
+
         return START_STICKY
     }
 
+    private fun setInitOverlayView() {
+        overlayView.apply(clickListener())
+
+        if (Build.VERSION.SDK_INT >= 26) {
+            params = WindowManager.LayoutParams(
+                    WindowManager.LayoutParams.WRAP_CONTENT,
+                    WindowManager.LayoutParams.WRAP_CONTENT,
+                    WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
+                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or
+                            WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN or
+                            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL or
+                            WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
+                    PixelFormat.TRANSLUCENT)
+        } else {
+            params = WindowManager.LayoutParams(
+                    WindowManager.LayoutParams.WRAP_CONTENT,
+                    WindowManager.LayoutParams.WRAP_CONTENT,
+                    WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
+                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE or
+                            WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN or
+                            WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL or
+                            WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
+                    PixelFormat.TRANSLUCENT)
+        }
+
+        windowManager.addView(overlayView, params)
+    }
+
+    private fun clickListener(): View.() -> Unit {
+        return {
+            setOnLongClickListener { view ->
+                isLongClick = true
+                false
+            }.apply {
+                setOnTouchListener { view, motionEvent ->
+
+                    val x = motionEvent.rawX.toInt()
+                    val y = motionEvent.rawY.toInt()
+
+                    when (motionEvent.action) {
+
+                        MotionEvent.ACTION_MOVE -> {
+                            if (isLongClick) {
+
+                                val centerX = x - (displaySize.x / 2)
+                                val centerY = y - (displaySize.y / 2)
+
+                                params?.x = centerX
+                                params?.y = centerY
+
+                                windowManager.updateViewLayout(overlayView, params)
+                            }
+                        }
+
+                        MotionEvent.ACTION_UP -> {
+                            if (isLongClick) {
+
+                            }
+                            isLongClick = false
+                        }
+                    }
+                    false
+                }
+            }
+        }
+    }
+
     override fun onBind(intent: Intent?): IBinder? {
         return null
     }