屏幕底部的Android TabLayout

Question

当我开始一个新的选项卡式 Activity 时，我有这个生成的 XML 代码:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context="eis1617.muellerkimmeyer.app.MainActivity">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingTop="@dimen/appbar_padding_top"
        android:theme="@style/AppTheme.AppBarOverlay">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:layout_scrollFlags="scroll|enterAlways"
            app:popupTheme="@style/AppTheme.PopupOverlay">

        </android.support.v7.widget.Toolbar>

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>

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

    <android.support.v4.view.ViewPager
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="@dimen/fab_margin"
        app:srcCompat="@android:drawable/ic_dialog_email" />

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

我到底应该如何改变它，标签栏将被放置在屏幕的底部？在 TabLayout 标签上，我已经尝试添加 android:layout_gravity="bottom"，但它没有改变任何东西。

Answer 1

我是这样实现的:

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
app:layout_behavior="in.mylo.pregnancy.baby.app.FAB">

<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <android.support.v7.widget.Toolbar
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@android:color/white" />
</android.support.design.widget.AppBarLayout>

   <android.support.v4.view.ViewPager
       android:id="@+id/viewPagerHome"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:layout_above="@+id/bottomNavigation" />

   <android.support.design.widget.AppBarLayout
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:layout_gravity="bottom"
       android:background="@android:color/white"
       android:elevation="80dp">

     <android.support.design.widget.TabLayout
          android:id="@+id/bottomNavigation"
          android:layout_width="match_parent"
          android:layout_height="56dp"
          android:clickable="true"
          app:tabBackground="?attr/selectableItemBackground"
          app:tabGravity="fill"
          app:tabIndicatorHeight="0dp"
          app:tabMode="fixed"
          app:tabSelectedTextColor="@android:color/black" />

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

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