Unmount react header on destroy

android/app/src/main/java/com/reactnativenavigation/screens/CollapsingViewPagerScreen.java

                 ((CollapsingContentView) contentView).destroy();
             }
         }
+        topBar.destroy();
     }
 
     protected ContentView getCurrentPage() {

android/app/src/main/java/com/reactnativenavigation/views/TopBar.java

             titleBar.show();
         }
     }
+
+    public void destroy() {
+
+    }
 }

android/app/src/main/java/com/reactnativenavigation/views/collapsingToolbar/CollapsingTopBar.java

     private final ViewCollapser viewCollapser;
     private final int topBarHeight;
 
+    @Override
+    public void destroy() {
+        if (params.hasReactView()) {
+            header.unmountReactView();
+        }
+    }
+
     public CollapsingTopBar(Context context, final StyleParams params) {
         super(context);
         styleParams = params;