diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 1de6c3b..98cbd3d 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -2,23 +2,24 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="com.example.cosmosclient">
-    <!-- ここからバーコードリーダーのアクセス許可 -->
+
     <application
         android:name=".app.Cosmos"
-        android:networkSecurityConfig="@xml/network_security_config"
         android:allowBackup="true"
         android:hardwareAccelerated="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:networkSecurityConfig="@xml/network_security_config"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity
             android:name=".views.DisplayGroupIDActivity"
             android:label="グループIDを表示する" />
+
         <activity
             android:name=".views.MemberListActivity"
-            android:label="グループメンバー"/>
+            android:label="グループメンバー" />
         <activity
             android:name=".views.CreateGroupActivity"
             android:label="グループ作成" />
@@ -71,13 +72,15 @@
         <activity
             android:name=".views.GroupListActivity"
             android:label="グループ一覧"
-            android:theme="@style/AppTheme.NoActionBar">
-        </activity>
+            android:theme="@style/AppTheme.NoActionBar"></activity>
+        <service
+            android:name=".services.CosomosBackgroundService"
+            android:exported="false"></service>
     </application>
-    <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
-
     <uses-permission android:name="android.permission.CAMERA" />
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
 </manifest>
\ No newline at end of file
diff --git a/app/src/main/java/com/example/cosmosclient/services/CosomosBackgroundService.java b/app/src/main/java/com/example/cosmosclient/services/CosomosBackgroundService.java
new file mode 100644
index 0000000..5240bad
--- /dev/null
+++ b/app/src/main/java/com/example/cosmosclient/services/CosomosBackgroundService.java
@@ -0,0 +1,96 @@
+package com.example.cosmosclient.services;
+
+import android.app.IntentService;
+import android.content.Intent;
+import android.content.Context;
+import android.location.Location;
+import android.location.LocationListener;
+import android.os.Bundle;
+import android.util.Log;
+
+
+public class CosomosBackgroundService extends IntentService implements LocationListener {
+
+    public CosomosBackgroundService() {
+        super("CosomosBackgroundService");
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Log.d("debug", "onCreate");
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+
+        Log.d("debug", "onStartCommand");
+
+//        Thread thread = new Thread() {
+//            public void run() {
+//                int count = 10;
+//
+//                try {
+//                    for(int i=0 ; i< count ; i++) {
+//                        Thread.sleep(1000);
+//
+//                        Log.d("debug", "sleep: " + String.valueOf(i));
+//                    }
+//
+//                } catch (InterruptedException e) {
+//                    Thread.currentThread().interrupt();
+//                }
+//            }
+//        };
+//        thread.start();
+
+
+        return super.onStartCommand(intent,flags,startId);
+    }
+
+    @Override
+    protected void onHandleIntent(Intent intent) {
+
+        Log.d("debug", "onHandleIntent");
+        int count = 10;
+
+        try {
+            for(int i=0 ; i< count ; i++) {
+                Thread.sleep(1000);
+
+                Log.d("debug", "sleep: " + String.valueOf(i));
+            }
+
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+
+    }
+
+    @Override
+    public void onDestroy() {
+        Log.d("debug", "onDestroy");
+
+        super.onDestroy();
+    }
+
+    @Override
+    public void onLocationChanged(Location location) {
+
+    }
+
+    @Override
+    public void onStatusChanged(String provider, int status, Bundle extras) {
+
+    }
+
+    @Override
+    public void onProviderEnabled(String provider) {
+
+    }
+
+    @Override
+    public void onProviderDisabled(String provider) {
+
+    }
+}
diff --git a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
index b5b78ae..29ef5a5 100644
--- a/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/SigninActivity.java
@@ -2,7 +2,10 @@
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.os.Build;
 import android.os.Handler;
+import android.os.HandlerThread;
+import android.support.annotation.RequiresApi;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.text.Editable;
@@ -12,10 +15,12 @@
 import android.widget.EditText;
 import android.widget.Toast;
 
+import com.example.cosmosclient.MainActivity;
 import com.example.cosmosclient.R;
 import com.example.cosmosclient.app.Cosmos;
 import com.example.cosmosclient.entities.SigninResponse;
 import com.example.cosmosclient.resources.UsersRest;
+import com.example.cosmosclient.services.CosomosBackgroundService;
 
 import retrofit2.Call;
 import retrofit2.Callback;
@@ -27,12 +32,40 @@
     private boolean uIdEnable;
     private boolean pwEnable;
     private Button SigninButton;
+    private Intent intentservice;
 
+
+    @RequiresApi(api = Build.VERSION_CODES.O)
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_signin);
 
+//        // 別スレ生成 -> 開始
+//        HandlerThread handlerThread = new HandlerThread("other");
+//        handlerThread.start();
+//
+//        //作成したHandlerThread(別スレ)内部のLooperを引数として、HandlerThread(のLooper)にメッセージを送るHandlerを生成する。
+//        Handler handler = new Handler(handlerThread.getLooper());
+//        //Handlerのpostメソッドでメッセージ(タスク：重たい処理)を送信する。
+//        handler.post(new Runnable() {
+//            @RequiresApi(api = Build.VERSION_CODES.O)
+//            @Override
+//            public void run() {
+//                //重たい処理を記述
+//                intentservice = new Intent(SigninActivity.this, CosomosBackgroundService.class);
+//                startForegroundService(intentservice);
+//            }
+//        });
+
+//        Thread thread = new Thread() {
+//            @RequiresApi(api = Build.VERSION_CODES.O)
+//            public void run() {
+                intentservice = new Intent(SigninActivity.this, CosomosBackgroundService.class);
+                startForegroundService(intentservice);
+//            }
+//        };
+//        thread.start();
         //各種IDを取得
         SigninButton = findViewById(R.id.SigninButton);
         Button SignupButton = findViewById(R.id.SignupButton);
@@ -148,6 +181,8 @@
             }
         });
     }
+
+
     private class GenericTextWatcher implements TextWatcher{
         private View view;