Android: Solve the incomplete display of HorizontalScrollView

<HorizontalScrollView
    android:id="@+id/hor"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbarFadeDuration="0"
    tools:ignore="UselessParent">                    

   <LinearLayout
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_marginBottom="20dp"
     android:layout_gravity="center_horizontal"
     android:orientation="horizontal">
 </LinearLayout>
</HorizontalScrollView>

Solution: remove the android:layout_gravity="center_horizontal" in the linear layout, horizontal sliding and horizontal centering will conflict