diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 1de6c3b..9919eb8 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 +72,17 @@
         <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.FOREGROUND_SERVICE" />
+
+
+    <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..4ce93a6
--- /dev/null
+++ b/app/src/main/java/com/example/cosmosclient/services/CosomosBackgroundService.java
@@ -0,0 +1,178 @@
+package com.example.cosmosclient.services;
+
+import android.Manifest;
+import android.app.IntentService;
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.Intent;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.Color;
+import android.location.Location;
+import android.location.LocationListener;
+import android.location.LocationManager;
+import android.os.Build;
+import android.os.Bundle;
+import android.support.annotation.RequiresApi;
+import android.support.v4.app.ActivityCompat;
+import android.util.Log;
+
+import com.example.cosmosclient.R;
+
+
+public class CosomosBackgroundService extends IntentService implements LocationListener {
+    private Context context;
+    private LocationManager locationManager;
+
+    public CosomosBackgroundService() {
+        super("CosomosBackgroundService");
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Log.d("debug", "onCreate");
+        context = getApplicationContext();
+        // LocationManager インスタンス生成
+        locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
+    }
+
+    @RequiresApi(api = Build.VERSION_CODES.O)
+    @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();
+        int requestCode = 0;
+        String channelId = "default";
+        String title = context.getString(R.string.app_name);
+        PendingIntent pendingIntent =
+                PendingIntent.getActivity(context, requestCode,
+                        intent, PendingIntent.FLAG_UPDATE_CURRENT);
+        // ForegroundにするためNotificationが必要、Contextを設定
+        NotificationManager notificationManager =
+                (NotificationManager)context.
+                        getSystemService(Context.NOTIFICATION_SERVICE);
+        // Notification　Channel 設定
+        NotificationChannel channel = new NotificationChannel(
+                channelId, title , NotificationManager.IMPORTANCE_DEFAULT);
+        channel.setDescription("Silent Notification");
+        // 通知音を消さないと毎回通知音が出てしまう
+        // この辺りの設定はcleanにしてから変更
+        channel.setSound(null,null);
+        // 通知ランプを消す
+        channel.enableLights(false);
+        channel.setLightColor(Color.BLUE);
+        // 通知バイブレーション無し
+        channel.enableVibration(false);
+        if(notificationManager != null) {
+            notificationManager.createNotificationChannel(channel);
+            Notification notification = new Notification.Builder(context, channelId)
+                    .setContentTitle(title)
+                    // 本来なら衛星のアイコンですがandroid標準アイコンを設定
+                    .setSmallIcon(android.R.drawable.btn_star)
+                    .setContentText("GPS")
+                    .setAutoCancel(true)
+                    .setContentIntent(pendingIntent)
+                    .setWhen(System.currentTimeMillis())
+                    .build();
+
+            // startForeground
+            startForeground(1, notification);
+        }
+//        startGPS();
+
+        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();
+        }
+    }
+//    protected void startGPS() {
+//        StringBuilder strBuf = new StringBuilder();
+//        strBuf.append("startGPS\n");
+//
+//        final boolean gpsEnabled
+//                = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
+//        if (!gpsEnabled) {
+//            // GPSを設定するように促す
+//            enableLocationSettings();
+//        }
+//
+//        if (locationManager != null) {
+//            try {
+//                if (ActivityCompat.checkSelfPermission(this,
+//                        Manifest.permission.ACCESS_FINE_LOCATION)!=
+//                        PackageManager.PERMISSION_GRANTED) {
+//                    return;
+//                }
+//
+//                locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,
+//                        MinTime, MinDistance, this);
+//            } catch (Exception e) {
+//                e.printStackTrace();
+//            }
+//        } else {
+//            strBuf.append("locationManager=null\n");
+//        }
+//    }
+    @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/GroupListActivity.java b/app/src/main/java/com/example/cosmosclient/views/GroupListActivity.java
index 45588fd..9c9374c 100644
--- a/app/src/main/java/com/example/cosmosclient/views/GroupListActivity.java
+++ b/app/src/main/java/com/example/cosmosclient/views/GroupListActivity.java
@@ -5,6 +5,7 @@
 import android.graphics.BitmapFactory;
 import android.nfc.Tag;
 import android.os.Bundle;
+import android.provider.MediaStore;
 import android.support.v4.app.ActivityCompat;
 import android.util.Base64;
 import android.util.Log;
@@ -22,6 +23,7 @@
 import android.widget.ArrayAdapter;
 import android.widget.BaseAdapter;
 import android.widget.GridView;
+import android.widget.ImageView;
 import android.widget.ListAdapter;
 import android.widget.TextView;
 import android.widget.Toast;
@@ -87,24 +89,30 @@
                 if (response.isSuccessful()) {
                     UserResponse result = response.body();
 
-                    //ユーザ名とユーザIDを表示したい
+                    //アイコンとユーザ名とユーザIDを表示したい
+                    final String uName;
+                    final String uIcon;
                     NavigationView navView = (NavigationView) findViewById(R.id.nav_view);
                     View headerView = navView.getHeaderView(0);
                     TextView userNameTextView = navView.getHeaderView(0).findViewById(R.id.userName);
                     TextView userIDTextView = navView.getHeaderView(0).findViewById(R.id.userID);
+                    ImageView userIcon = navView.getHeaderView(0).findViewById(R.id.userIcon);
                     userIDTextView.setText("ユーザID："+uId);
-                    final String uName;
                     uName = result.name;
+                    uIcon = result.iconUri;
                     userNameTextView.setText("ユーザ名："+uName);
+                    if (uIcon != null) {
+                        byte[] decodedByte = Base64.decode(uIcon, 0);
+                        userIcon.setImageBitmap(BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length));
+                    }
 
-
-                    //画像をBase64に変換
-                    Bitmap icon = BitmapFactory.decodeResource(getResources(),R.drawable.default_icon_image);
-                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
-                    icon.compress(Bitmap.CompressFormat.JPEG,100, baos);
-                    byte[] b = baos.toByteArray();
-                    String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);
-//                    Toast.makeText(GroupListActivity.this,"接続できたよ",Toast.LENGTH_LONG).show();
+//                    //画像をBase64に変換
+//                    Bitmap icon = BitmapFactory.decodeResource(getResources(),R.drawable.default_icon_image);
+//                    ByteArrayOutputStream baos = new ByteArrayOutputStream();
+//                    icon.compress(Bitmap.CompressFormat.JPEG,100, baos);
+//                    byte[] b = baos.toByteArray();
+//                    String imageEncoded = Base64.encodeToString(b, Base64.DEFAULT);
+////                    Toast.makeText(GroupListActivity.this,"接続できたよ",Toast.LENGTH_LONG).show();
 
 
                     //アイコンが未設定ならデフォルト画像を設定
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 aac4424..b9769aa 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;
+
 
     @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;
 
diff --git a/app/src/main/res/layout/nav_header_group_list.xml b/app/src/main/res/layout/nav_header_group_list.xml
index 649c531..81a5cda 100644
--- a/app/src/main/res/layout/nav_header_group_list.xml
+++ b/app/src/main/res/layout/nav_header_group_list.xml
@@ -14,9 +14,9 @@
     android:theme="@style/ThemeOverlay.AppCompat.Dark">
 
     <ImageView
-        android:id="@+id/imageView"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
+        android:id="@+id/userIcon"
+        android:layout_width="@android:dimen/notification_large_icon_width"
+        android:layout_height="@android:dimen/notification_large_icon_height"
         android:contentDescription="@string/nav_header_desc"
         android:paddingTop="@dimen/nav_header_vertical_spacing"
         app:srcCompat="@mipmap/ic_launcher_round" />