上课/下课控制功能（老师端）

课堂状态实时同步到所有成员
成员权限管理（静音/取消静音学生）
老师控制面板UI组件

client/mobile/pages_classroom.tsx

@@ -22,6 +22,13 @@ interface ImGroupMessage {
   timestamp?: number;
 }
 
+// 课堂状态枚举
+enum ClassStatus {
+  NOT_STARTED = 'not_started',
+  IN_PROGRESS = 'in_progress',
+  ENDED = 'ended'
+}
+
 // 课堂上下文类型
 type ClassroomContextType = {
   userId: string;
@@ -30,7 +37,11 @@ type ClassroomContextType = {
   isJoinedClass: boolean;
   messageList: string[];
   errorMessage: string;
+  classStatus: ClassStatus;
   setRole: (role: 'teacher' | 'student') => void;
+  startClass: () => Promise<void>;
+  endClass: () => Promise<void>;
+  toggleMuteMember: (userId: string, mute: boolean) => Promise<void>;
 };
 
 const ClassroomContext = createContext<ClassroomContextType | null>(null);
@@ -96,6 +107,7 @@ export const ClassroomPage = () => {
   const [msgText, setMsgText] = useState<string>('');
   const [messageList, setMessageList] = useState<string[]>([]);
   const [errorMessage, setErrorMessage] = useState<string>('');
+  const [classStatus, setClassStatus] = useState<ClassStatus>(ClassStatus.NOT_STARTED);
 
   // SDK实例
   const imEngine = useRef<ImEngine | null>(null);
@@ -134,7 +146,31 @@ export const ClassroomPage = () => {
     if (!imMessageManager.current) return;
 
     imMessageManager.current.on('recvgroupmessage', (msg: AliVCInteraction.ImMessage, groupId: string) => {
-      showMessage(`收到消息: ${msg.data}`);
+      if (msg.type === 88889) { // 课堂状态消息
+        try {
+          const data = JSON.parse(msg.data);
+          if (data.action === 'start_class') {
+            setClassStatus(ClassStatus.IN_PROGRESS);
+            showMessage('老师已开始上课');
+          } else if (data.action === 'end_class') {
+            setClassStatus(ClassStatus.ENDED);
+            showMessage('老师已结束上课');
+          }
+        } catch (err) {
+          console.error('解析课堂状态消息失败', err);
+        }
+      } else if (msg.type === 88890) { // 静音指令
+        try {
+          const data = JSON.parse(msg.data);
+          if (data.action === 'toggle_mute' && data.userId === userId) {
+            showMessage(data.mute ? '你已被老师静音' : '老师已取消你的静音');
+          }
+        } catch (err) {
+          console.error('解析静音指令失败', err);
+        }
+      } else {
+        showMessage(`收到消息: ${msg.data}`);
+      }
     });
   };
 
@@ -266,6 +302,63 @@ export const ClassroomPage = () => {
     }
   };
 
+  // 开始上课
+  const startClass = async (): Promise<void> => {
+    if (!imMessageManager.current || !classId || role !== 'teacher') return;
+    
+    try {
+      await imMessageManager.current.sendGroupMessage({
+        groupId: classId,
+        data: JSON.stringify({ action: 'start_class' }),
+        type: 88889, // 自定义消息类型
+        level: ImMessageLevel.HIGH,
+      });
+      setClassStatus(ClassStatus.IN_PROGRESS);
+      showToast('success', '课堂已开始');
+    } catch (err: any) {
+      setErrorMessage(`开始上课失败: ${err.message}`);
+    }
+  };
+
+  // 结束上课
+  const endClass = async (): Promise<void> => {
+    if (!imMessageManager.current || !classId || role !== 'teacher') return;
+    
+    try {
+      await imMessageManager.current.sendGroupMessage({
+        groupId: classId,
+        data: JSON.stringify({ action: 'end_class' }),
+        type: 88889, // 自定义消息类型
+        level: ImMessageLevel.HIGH,
+      });
+      setClassStatus(ClassStatus.ENDED);
+      showToast('success', '课堂已结束');
+    } catch (err: any) {
+      setErrorMessage(`结束上课失败: ${err.message}`);
+    }
+  };
+
+  // 静音/取消静音成员
+  const toggleMuteMember = async (userId: string, mute: boolean): Promise<void> => {
+    if (!imMessageManager.current || !classId || role !== 'teacher') return;
+    
+    try {
+      await imMessageManager.current.sendGroupMessage({
+        groupId: classId,
+        data: JSON.stringify({
+          action: 'toggle_mute',
+          userId,
+          mute
+        }),
+        type: 88890, // 自定义消息类型
+        level: ImMessageLevel.HIGH,
+      });
+      showToast('info', mute ? `已静音用户 ${userId}` : `已取消静音用户 ${userId}`);
+    } catch (err: any) {
+      setErrorMessage(`操作失败: ${err.message}`);
+    }
+  };
+
   // 清理资源
   useEffect(() => {
     return () => {
@@ -292,7 +385,11 @@ export const ClassroomPage = () => {
       isJoinedClass,
       messageList,
       errorMessage,
+      classStatus,
       setRole,
+      startClass,
+      endClass,
+      toggleMuteMember
     }}>
       <div className="container mx-auto p-4">
         <h1 className="text-2xl font-bold mb-4">互动课堂</h1>