fix: 修正 查無跌倒影片顯示黑屏

lib/HistoricalRecord.dart

@@ -186,7 +186,7 @@ class _FallDetailPageState extends State<FallDetailPage> {
   void initState() {
     super.initState();
     BetterPlayerConfiguration betterPlayerConfiguration =
-      BetterPlayerConfiguration(
+      const BetterPlayerConfiguration(
         aspectRatio: 16 / 9,
         fit: BoxFit.contain,
       );
@@ -225,6 +225,7 @@ class _FallDetailPageState extends State<FallDetailPage> {
           videoFormat: BetterPlayerVideoFormat.hls,
         );
         _betterPlayerController.setupDataSource(dataSource);
+        setState(() {}); // 重新繪製畫面
       }
 
     } catch (e) {
@@ -253,8 +254,7 @@ class _FallDetailPageState extends State<FallDetailPage> {
             SizedBox(height: 10),
             Text('跌倒地點: ${widget.fallDetail['跌倒地點']}', style: TextStyle(fontSize: 18)),
             // 在這裡可以添加更多詳細資料
-            if (_betterPlayerController != null)
-              AspectRatio(
+            if (fhvideoId != '') AspectRatio(
               aspectRatio: 16 / 9,
               child: BetterPlayer(controller: _betterPlayerController),
             ),