diff --git a/app/src/main/java/com/example/nemophila/FriendActivity.java b/app/src/main/java/com/example/nemophila/FriendActivity.java
index 6b084ea..dbca5a6 100644
--- a/app/src/main/java/com/example/nemophila/FriendActivity.java
+++ b/app/src/main/java/com/example/nemophila/FriendActivity.java
@@ -31,6 +31,7 @@
 import java.util.List;
 
 public class FriendActivity extends AppCompatActivity {
+    private Nemophila nemophila;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -40,7 +41,7 @@
         List<FriendDataModel> friendsDataset = new ArrayList<>();  // 1行分の情報を持つDataModelを格納するリスト
         RecyclerView rv = findViewById(R.id.friendsList);  // recyclerViewを取得
         FriendViewModel friendViewModel = new ViewModelProvider(this).get(FriendViewModel.class);  // ViewModelを取得
-        Nemophila nemophila = (Nemophila) this.getApplication();
+        nemophila = (Nemophila) this.getApplication();
 
 
         //一行ずつを縦に(LinearLayout)表示するLayoutManagerを宣言
@@ -77,8 +78,11 @@
             void onFavoriteClick(View view, int position, FriendDataModel friend, ImageView favorite) {
                 if (favorite.getVisibility() == View.INVISIBLE) {
                     favorite.setVisibility(View.VISIBLE);
+                    nemophila.setFavoriteFriends(friend.getId());
                 } else {
                     favorite.setVisibility(View.INVISIBLE);
+                    nemophila.removeFavoriteFriends(friend.getId());
+                    System.out.println(nemophila.getFavoriteFriends());
                 }
             }
         };
@@ -114,14 +118,14 @@
     // ----------- RecyclerView用の内部クラス ------------//
     // Adapter
     abstract public class FriendActivityAdapter extends RecyclerView.Adapter<FriendsViewHolder> {
-        private List<FriendDataModel> friendDatas;
+        private List<FriendDataModel> friendData;
 
-        public FriendActivityAdapter(List<FriendDataModel> friendDatas) {
-            this.friendDatas = friendDatas;
+        public FriendActivityAdapter(List<FriendDataModel> friendData) {
+            this.friendData = friendData;
         }
 
-        public void setList(List<FriendDataModel> friendDatas) {
-            this.friendDatas = friendDatas;
+        public void setList(List<FriendDataModel> friendData) {
+            this.friendData = friendData;
         }
 
         @NonNull
@@ -138,7 +142,7 @@
                 public void onClick(View v) {
                     int position = vh.getBindingAdapterPosition();
                     // 処理はonDeleteClick()に丸投げ
-                    onDeleteClick(v, position, friendDatas.get(position));
+                    onDeleteClick(v, position, friendData.get(position));
                 }
             });
 
@@ -148,7 +152,7 @@
                 public void onClick(View v) {
                     int position = vh.getBindingAdapterPosition();
                     // 処理はonFavoriteClick()に丸投げ
-                    onFavoriteClick(v, position, friendDatas.get(position), vh.favorite);
+                    onFavoriteClick(v, position, friendData.get(position), vh.favorite);
                 }
             });
 
@@ -158,12 +162,15 @@
         @Override
         public void onBindViewHolder(@NonNull FriendsViewHolder holder, int position) {
             // 後からアイコンの登録をできるようにする
-            holder.nameView.setText(friendDatas.get(position).getName());
+            holder.nameView.setText(friendData.get(position).getName());
+            if (nemophila.getFavoriteFriends().contains(friendData.get(position).getId())) {
+                holder.favorite.setVisibility(View.VISIBLE);
+            }
         }
 
         @Override
         public int getItemCount() {
-            return friendDatas.size();
+            return friendData.size();
         }
 
         abstract void onDeleteClick(View view, int position, FriendDataModel friend);