优化

app/src/main/res/layout/activity_main.xml

@@ -18,6 +18,7 @@
         android:layout_width="match_parent"
         android:layout_height="50dp"
         android:background="@color/background"
+        app:itemActiveIndicatorStyle="@color/transparent"
         app:labelVisibilityMode="unlabeled"
         app:menu="@menu/main_bnv" />