update float button

lib/pages/community/community_index.dart

@@ -110,7 +110,9 @@ class _CommunityIndexState extends State<CommunityIndex>
     return BeeScaffold(
       title: '社区',
       actions: _listActions(),
-      body: Column(
+      body: Stack(
+        children: [
+          Column(
             children: [
               Material(
                 color: kForeGroundColor,
@@ -153,6 +155,14 @@ class _CommunityIndexState extends State<CommunityIndex>
                   ),
                 ),
               ),
+              // _floatingActionButton(),
+            ],
+          ),
+          Positioned(
+            right: 30.w,
+            bottom: 50.w,
+            child: _floatingActionButton(),
+          )
         ],
       ),
     );