clean code

lib/src/cartoon_material_controls.dart

@@ -37,7 +37,6 @@ typedef void OnTapMoreVideo(int index);
 
 class CartoonMaterialControlsState extends State<CartoonMaterialControls> {
   VideoPlayerValue _latestValue;
-  double _latestVolume;
   bool _hideStuff = true;
   Timer _hideTimer;
   Timer _initTimer;
@@ -429,7 +428,6 @@ class CartoonMaterialControlsState extends State<CartoonMaterialControls> {
                           return Image(image:  AssetImage("assets/dub_user_play/${widget.isCollect.value == 1 ? "xin.png" : "hxin.png"}", package: 'chewie'), width: 20, height: 20,);
                         }
                     ),
-
                     onTap: widget.onTapLove,
                   ),
               ),
@@ -531,27 +529,6 @@ class CartoonMaterialControlsState extends State<CartoonMaterialControls> {
     );
   }
 
-  GestureDetector _buildExpandButton() {
-    return GestureDetector(
-      onTap: _onExpandCollapse,
-      child: AnimatedOpacity(
-        opacity: _hideStuff ? 0.0 : 1.0,
-        duration: Duration(milliseconds: 300),
-        child: Container(
-          height: barHeight,
-          margin: EdgeInsets.only(right: 12.0),
-          padding: EdgeInsets.only(
-            left: 8.0,
-            right: 8.0,
-          ),
-          child: Center(
-              child: Image(image: AssetImage("assets/dub_user_play/${chewieController.isFullScreen ? "shousuo.png" : "fangda.png"}", package: 'chewie'), width: 20, height: 20,),
-          ),
-        ),
-      ),
-    );
-  }
-
   Expanded _buildHitArea() {
     return Expanded(
       child: GestureDetector(
@@ -755,7 +732,6 @@ class CartoonMaterialControlsState extends State<CartoonMaterialControls> {
   }
 
   void onTapBack() {
-    print("onTapBack");
     chewieController.exitFullScreen();
   }