diff --git a/app/src/androidTest/java/com/example/childguard/Bluetooth_device_save.java b/app/src/androidTest/java/com/example/childguard/Bluetooth_device_save.java
deleted file mode 100644
index de0df1c..0000000
--- a/app/src/androidTest/java/com/example/childguard/Bluetooth_device_save.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package com.example.childguard;
-
-import android.content.Context;
-import android.content.SharedPreferences;
-import android.preference.PreferenceManager;
-
-import androidx.appcompat.app.AppCompatActivity;
-
-public class Bluetooth_device_save extends AppCompatActivity {
-    final SharedPreferences pref= PreferenceManager.getDefaultSharedPreferences(this);
-    public Bluetooth_device_save() {
-    }
-    public void device_save(String deviceAddress){
-        SharedPreferences.Editor e=pref.edit();
-        e.putString("bluetooth_device1",deviceAddress);
-        e.apply();
-    }
-    public String device_info(){
-        return pref.getString("bluetooth_device1","not_device");
-    }
-}
diff --git a/app/src/main/java/com/example/childguard/Bluetooth_device_save.java b/app/src/main/java/com/example/childguard/Bluetooth_device_save.java
new file mode 100644
index 0000000..5673005
--- /dev/null
+++ b/app/src/main/java/com/example/childguard/Bluetooth_device_save.java
@@ -0,0 +1,22 @@
+package com.example.childguard;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class Bluetooth_device_save {
+    SharedPreferences pref;
+
+//    public void device_save(String deviceAddress){
+//        pref = PreferenceManager.getDefaultSharedPreferencesName()
+//        SharedPreferences.Editor e=pref.edit();
+//        e.putString("bluetooth_device1",deviceAddress);
+//        e.apply();
+//    }
+    public String device_info(){
+        return pref.getString("bluetooth_device1","not_device");
+    }
+}
diff --git a/app/src/main/java/com/example/childguard/HomeFragment.java b/app/src/main/java/com/example/childguard/HomeFragment.java
index a5ad221..88cf221 100644
--- a/app/src/main/java/com/example/childguard/HomeFragment.java
+++ b/app/src/main/java/com/example/childguard/HomeFragment.java
@@ -16,6 +16,8 @@ import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
 import androidx.print.PrintHelper;
 
+import android.preference.PreferenceManager;
+import android.text.PrecomputedText;
 import android.util.AndroidRuntimeException;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -25,6 +27,7 @@ import android.widget.Button;
 import android.widget.FrameLayout;
 import android.widget.ImageView;
 import android.widget.TextView;
+import android.widget.Toast;
 
 import com.google.zxing.BarcodeFormat;
 import com.google.zxing.WriterException;
@@ -100,6 +103,10 @@ public class HomeFragment extends Fragment {
                 replaceFragment(new bluetooth_setupFragment());
             }
         });
+
+        view.findViewById(R.id.bt_debug).setOnClickListener( v -> {
+            Toast.makeText(getContext(), PreferenceManager.getDefaultSharedPreferences(getContext().getApplicationContext()).getString("bluetooth_device1", "none"), Toast.LENGTH_SHORT).show();
+        });
         return view;
     }
 
diff --git a/app/src/main/java/com/example/childguard/RecyclerAdapter.java b/app/src/main/java/com/example/childguard/RecyclerAdapter.java
index d348ce3..a9f550b 100644
--- a/app/src/main/java/com/example/childguard/RecyclerAdapter.java
+++ b/app/src/main/java/com/example/childguard/RecyclerAdapter.java
@@ -1,5 +1,7 @@
 package com.example.childguard;
 
+import android.content.Context;
+import android.preference.PreferenceManager;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -16,11 +18,14 @@ public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ItemVi
 
     ArrayList<String[]> deviceList;
 
+    Context applicationContext;
+
     // Constructor
-    public RecyclerAdapter(ArrayList<String[]> deviceList) {
+    public RecyclerAdapter(ArrayList<String[]> deviceList, Context applicationContext) {
         // Init
         Log.d("RecyclerAdapter", "Constructor called");
         this.deviceList = deviceList;
+        this.applicationContext = applicationContext;
     }
 
     @NonNull
@@ -35,7 +40,6 @@ public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ItemVi
     public void onBindViewHolder(@NonNull ItemViewHolder holder, int position) {
         holder.textView.setText(deviceList.get(position)[0]);
         holder.textView.setOnClickListener( v -> {
-            Toast.makeText(v.getContext(), deviceList.get(position)[1], Toast.LENGTH_SHORT).show();
 
             // アラートダイアログを表示
             new androidx.appcompat.app.AlertDialog.Builder(v.getContext())
@@ -44,6 +48,8 @@ public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ItemVi
                     .setPositiveButton(android.R.string.ok, (dialog, which) -> {
                         // OK button pressed
                         Toast.makeText(v.getContext(), "OK button clicked", Toast.LENGTH_SHORT).show();
+                        Toast.makeText(v.getContext(), deviceList.get(position)[1], Toast.LENGTH_SHORT).show();
+                        PreferenceManager.getDefaultSharedPreferences(this.applicationContext).edit().putString("bluetooth_device1", deviceList.get(position)[1]).apply();
                     })
                     .setNegativeButton(android.R.string.cancel, null)
                     .show();
diff --git a/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java b/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java
index 2507185..bead941 100644
--- a/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java
+++ b/app/src/main/java/com/example/childguard/bluetooth_setupFragment.java
@@ -134,7 +134,7 @@ public class bluetooth_setupFragment extends Fragment {
                 Log.d("b", s[0]);
             }
             Log.d(" ", String.valueOf(arrayList.size()));
-            RecyclerAdapter adapter = new RecyclerAdapter(arrayList);
+            RecyclerAdapter adapter = new RecyclerAdapter(arrayList, requireActivity().getApplicationContext());
 
             //④RecyclerViewとAdapterの結び付け
             recyclerView.setAdapter(adapter);
@@ -144,4 +144,5 @@ public class bluetooth_setupFragment extends Fragment {
 
     }
 
+
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_home.xml b/app/src/main/res/layout/fragment_home.xml
index 504ddf1..ef0046a 100644
--- a/app/src/main/res/layout/fragment_home.xml
+++ b/app/src/main/res/layout/fragment_home.xml
@@ -103,6 +103,16 @@
                 android:textColor="@color/white"
                 android:textSize="40dp" />
 
+            <Button
+                android:id="@+id/bt_debug"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:backgroundTint="#778899"
+                android:text="Bluetooth設定"
+                android:textColor="@color/white"
+                android:textSize="40dp" />
+
+
             <FrameLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"