diff --git a/.idea/misc.xml b/.idea/misc.xml
index 0ad17cb..8978d23 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,4 +1,3 @@
-<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
diff --git a/app/src/main/java/com/example/childguard/HomeFragment.java b/app/src/main/java/com/example/childguard/HomeFragment.java
index 6637e1b..09f6885 100644
--- a/app/src/main/java/com/example/childguard/HomeFragment.java
+++ b/app/src/main/java/com/example/childguard/HomeFragment.java
@@ -1,12 +1,19 @@
 package com.example.childguard;
 
+import android.content.SharedPreferences;
+import android.graphics.Color;
+import android.graphics.drawable.Drawable;
 import android.os.Bundle;
 
+import androidx.core.content.res.ResourcesCompat;
 import androidx.fragment.app.Fragment;
 
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.FrameLayout;
+import android.widget.TextView;
 
 /**
  * A simple {@link Fragment} subclass.
@@ -61,4 +68,26 @@ public class HomeFragment extends Fragment {
         // Inflate the layout for this fragment
         return inflater.inflate(R.layout.fragment_home, container, false);
     }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        Log.d("HomeFragment", "onResume: called");
+        TextView situationTextView = getView().findViewById(R.id.situation);
+        FrameLayout situation_bg=getView().findViewById(R.id.situation_bg);
+        updateInCarStatus(situationTextView,situation_bg);
+    }
+
+    public void updateInCarStatus(TextView situationTextView,FrameLayout situation_bg) {
+        SharedPreferences sharedPreferences = getActivity().getSharedPreferences("default", 0);
+
+        Log.d("HomeFragment", "updateInCarStatus: " + sharedPreferences.getBoolean("inCar", false));
+        if (sharedPreferences.getBoolean("inCar", false)) {
+            situationTextView.setText("\n降車状態");
+            situation_bg.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.frame_style, null));
+        } else {
+            situationTextView.setText("\n乗車状態");
+            situation_bg.setBackground(ResourcesCompat.getDrawable(getResources(), R.drawable.frame_style_orange, null));
+        }
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/childguard/QR.java b/app/src/main/java/com/example/childguard/QR.java
new file mode 100644
index 0000000..ebdf156
--- /dev/null
+++ b/app/src/main/java/com/example/childguard/QR.java
@@ -0,0 +1,33 @@
+package com.example.childguard;
+
+import android.graphics.Color;
+import android.graphics.drawable.Drawable;
+import android.os.Bundle;
+import android.widget.TextView;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class QR extends AppCompatActivity {
+    String get_on="乗車状態";
+    String get_off ="降車状態";
+    TextView tv=findViewById(R.id.situation);
+    @Override
+    protected void onCreate(Bundle savedInstanceState){
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.fragment_qr);
+
+        findViewById(R.id.camera).setOnClickListener(
+                v -> {
+                    if(get_on.equals(tv.getText().toString())){
+                        tv.setText(get_off);
+                        findViewById(R.id.situation_bg).setBackgroundColor(Color.parseColor("#dcdcdc"));
+                    }
+                    else {
+                        tv.setText(get_on);
+                        findViewById(R.id.situation_bg).setBackgroundColor(Color.parseColor("#ff4500"));
+                    }
+                }
+        );
+    }
+
+}
diff --git a/app/src/main/java/com/example/childguard/QRFragment.java b/app/src/main/java/com/example/childguard/QRFragment.java
index 4321325..7e26151 100644
--- a/app/src/main/java/com/example/childguard/QRFragment.java
+++ b/app/src/main/java/com/example/childguard/QRFragment.java
@@ -1,12 +1,15 @@
 package com.example.childguard;
 
+import android.content.SharedPreferences;
 import android.os.Bundle;
 
 import androidx.fragment.app.Fragment;
 
+import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 
 /**
  * A simple {@link Fragment} subclass.
@@ -53,12 +56,33 @@ public class QRFragment extends Fragment {
             mParam1 = getArguments().getString(ARG_PARAM1);
             mParam2 = getArguments().getString(ARG_PARAM2);
         }
+
+
     }
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
                              Bundle savedInstanceState) {
         // Inflate the layout for this fragment
-        return inflater.inflate(R.layout.fragment_qr, container, false);
+        View view = inflater.inflate(R.layout.fragment_qr, container, false);
+
+        Button cameraButton = view.findViewById(R.id.camera);
+
+        // Init shared preferences
+        SharedPreferences sharedPreferences = getActivity().getSharedPreferences("default", 0);
+        SharedPreferences.Editor editor = sharedPreferences.edit();
+
+        cameraButton.setOnClickListener(v -> {
+            Log.d("QRFragment", "onClick: called");
+            if (!sharedPreferences.getBoolean("inCar", false)) {
+                editor.putBoolean("inCar", true);
+            } else {
+                editor.putBoolean("inCar", false);
+            }
+            editor.apply();
+        });
+
+        return view;
     }
+
 }
\ No newline at end of file
diff --git a/app/src/main/res/drawable/frame_style_orange.xml b/app/src/main/res/drawable/frame_style_orange.xml
new file mode 100644
index 0000000..3b4922f
--- /dev/null
+++ b/app/src/main/res/drawable/frame_style_orange.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="#ffa500"/>
+    <corners android:radius="25dp"/>
+
+</shape>
\ 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 a3ec0de..21d6c78 100644
--- a/app/src/main/res/layout/fragment_home.xml
+++ b/app/src/main/res/layout/fragment_home.xml
@@ -7,8 +7,8 @@
     android:layout_height="match_parent"
     android:orientation="vertical"
     tools:context=".HomeFragment">
-
     <FrameLayout
+        android:id="@+id/situation_bg"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:background="@drawable/frame_style"
@@ -26,6 +26,7 @@
             android:textColor="@color/black"
             android:textAlignment="center"/>
         <TextView
+            android:id="@+id/situation"
             android:layout_width="match_parent"
             android:layout_height="200dp"
             android:layout_marginTop="10dp"
diff --git a/app/src/main/res/layout/fragment_qr.xml b/app/src/main/res/layout/fragment_qr.xml
index ae578fe..cd43e15 100644
--- a/app/src/main/res/layout/fragment_qr.xml
+++ b/app/src/main/res/layout/fragment_qr.xml
@@ -6,9 +6,11 @@
     tools:context=".QRFragment">
 
     <!-- TODO: Update blank fragment layout -->
-    <TextView
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:text="@string/hello_blank_fragment" />
+    <Button
+        android:id="@+id/camera"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        />
 
 </FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index c8524cd..a004ac3 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -2,4 +2,5 @@
 <resources>
     <color name="black">#FF000000</color>
     <color name="white">#FFFFFFFF</color>
+    <color name="orange">#FF4500</color>
 </resources>
\ No newline at end of file