这部分android屏幕的名称是什么？

第一：屏幕底部黑条的官方名称是什么

第二：

我有两个布局合并在一起的问题是我的第二个布局的一部分将隐藏在这个栏后面有一个红色的栏，但这个问题是隐藏在这些设备有这个栏

<?xml version="1.0" encoding="utf-8"?>

---

Android导航按钮。您还可以更改它的颜色或隐藏/显示它们

此栏的名称是导航栏

这是一个导航栏，您可以通过隐藏/显示它或更改i的颜色来操作它。它的导航栏是导航栏，顶部是状态栏和操作栏XD底部导航栏

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        app:popupTheme="@style/AppTheme.PopupOverlay" />

</android.support.design.widget.AppBarLayout>

<include layout="@layout/content_opina" />

<android.support.design.widget.FloatingActionButton
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    android:src="@drawable/ic_add_24dp" />

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<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
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                                <TextView
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                                            android:text="Question ... "
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                                android:text="2W"
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                            android:textColor="#000000"
                            android:textAppearance="?android:attr/textAppearanceSmall"
                            android:text="There is no such attribute in Android, to show a shadow. But possible ways to do it ... Have a 9-patch image with a shadow and set it as the background to your"
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                            <TextView
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