.idea/gradle.xml

@@ -1,10 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="#GRADLE_LOCAL_JAVA_HOME" />
+        <option name="gradleJvm" value="Embedded JDK" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />

.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">

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"));
+                    }
+                }
+        );
+    }
+
+}

app/src/main/java/com/example/childguard/QRFragment.java

@@ -1,5 +1,6 @@
 package com.example.childguard;
 
+import android.content.SharedPreferences;
 import android.os.Bundle;
 
 import androidx.fragment.app.Fragment;
@@ -7,6 +8,7 @@ import androidx.fragment.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.Button;
 
 /**
  * A simple {@link Fragment} subclass.
@@ -53,12 +55,20 @@ 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);
+
+
+        return view;
     }
+
 }

app/src/main/res/layout/fragment_home.xml

@@ -9,6 +9,7 @@
     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 +27,7 @@
             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"

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>

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>