如图所示，如何在android中为底部导航栏设置顶部边框 [英] how to set top border for bottom navigation bar in android as shown in image

问题描述

是否可以在android中为底部导航栏设置顶部边框，请告诉我如何为此，我正在使用android的新底部导航视图。
这是我的代码

is it possible to set top border for bottom navigation bar in android, if possible tell me how we can do this, i am using the new bottom navigation view of android. Here is my code

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
        <LinearLayout
            android:id="@+id/app_bar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_alignParentTop="true">
                <include
                    android:id="@+id/gamebar"
                    layout="@layout/gamebar_layout"
                    />
                <include
                    android:id="@+id/toolbar"
                    layout="@layout/toolbar_layout" />
        </LinearLayout>

        <!-- Let's add fragment -->
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/app_bar_layout"
            android:layout_above="@+id/bottom_navigation"
            android:id="@+id/contentContainer"/>
        <android.support.design.widget.BottomNavigationView
            android:id="@+id/bottom_navigation"
            android:layout_width="match_parent"
            android:layout_height="56dp"
            android:layout_alignParentBottom="true"
            app:itemBackground="@color/BottomNavigationBgColor"
            app:itemIconTint="@color/CelestialBlue"
            app:itemTextColor="@color/CelestialBlue"
            app:menu="@menu/bottom_navigation_main" />
</RelativeLayout>

推荐答案

您可以尝试以下操作：添加在 BottomNavigationView

You can try this: add a View element above BottomNavigationView

<View
    android:layout_width="match_parent"
    android:layout_height="4dp"
    android:layout_above="@+id/bottom_navigation"
    android:background="#000000"></View>

<android.support.design.widget.BottomNavigationView
    android:id="@+id/bottom_navigation"
    android:layout_width="match_parent"
    android:layout_height="56dp"
    android:layout_alignParentBottom="true"
    app:itemBackground="@color/BottomNavigationBgColor"
    app:itemIconTint="@color/CelestialBlue"
    app:itemTextColor="@color/CelestialBlue"
    app:menu="@menu/bottom_navigation_main" />

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