fix player widget play status error when switch stream

Flutter/superplayer_widget/lib/model/superplayer_define.dart

@@ -3,7 +3,6 @@ part of demo_super_player_lib;
 
 enum SuperPlayerState {
   INIT,       // Initial state
-  PREPARED,   // prepared
   PLAYING,    // Playing
   PAUSE,      // Paused
   LOADING,    // Buffering

Flutter/superplayer_widget/lib/superplayer_controller.dart

@@ -134,7 +134,6 @@ class SuperPlayerController {
           }
           videoDuration = await _vodPlayerController.getDuration();
           currentDuration = await _vodPlayerController.getCurrentPlaybackTime();
-          _updatePlayerState(SuperPlayerState.PREPARED);
           break;
         case TXVodPlayEvent.PLAY_EVT_PLAY_LOADING: // PLAY_EVT_PLAY_LOADING
           if (playerState == SuperPlayerState.PAUSE) {
@@ -571,8 +570,6 @@ class SuperPlayerController {
     playerState = state;
     switch (state) {
       case SuperPlayerState.INIT:
-        break;
-      case SuperPlayerState.PREPARED:
         _observer?.onPlayPrepare();
         break;
       case SuperPlayerState.PLAYING:

Flutter/superplayer_widget/lib/ui/superplayer_widget.dart

@@ -22,7 +22,7 @@ class SuperPlayerViewState extends State<SuperPlayerView> with WidgetsBindingObs
   late SuperPlayerController _playController;
   bool _isFloatingMode = false;
   bool _isPlaying = false;
-  bool _isLoading = false;
+  bool _isLoading = true;
   bool _isShowCover = true;
 
   double _radioWidth = 0;
@@ -269,13 +269,9 @@ class SuperPlayerViewState extends State<SuperPlayerView> with WidgetsBindingObs
         _isLoading = true;
         _coverViewKey.currentState?.hideCover();
         break;
-      case SuperPlayerState.PREPARED:
-        _isPlaying = false;
-        _isLoading = false;
-        break;
       case SuperPlayerState.INIT:
         _isPlaying = false;
-        _isLoading = true;
+        _isLoading = false;
         break;
     }
   }
@@ -604,7 +600,7 @@ class SuperPlayerViewState extends State<SuperPlayerView> with WidgetsBindingObs
     int playAction = _playController.videoModel!.playAction;
     if (playerState == SuperPlayerState.LOADING && playAction == SuperPlayerModel.PLAY_ACTION_PRELOAD) {
       _playController.resume();
-    } else if (playerState == SuperPlayerState.INIT || playerState == SuperPlayerState.PREPARED) {
+    } else if (playerState == SuperPlayerState.INIT) {
       if (playAction == SuperPlayerModel.PLAY_ACTION_PRELOAD) {
         _playController.resume();
       } else if (playAction == SuperPlayerModel.PLAY_ACTION_MANUAL_PLAY) {