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

<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity">

    <android.support.design.widget.CoordinatorLayout

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <android.support.design.widget.AppBarLayout

        android:layout_width="match_parent"

        android:layout_height="100dp"

        android:gravity="center"

        android:elevation="0dp"

        app:elevation="0dp"

        android:id="@+id/appbar_id"

        >

        <android.support.v7.widget.Toolbar

            android:id="@+id/tb_id"

            android:layout_width="match_parent"

            android:layout_height="?android:attr/actionBarSize"

            android:background="?attr/colorPrimary"

            app:titleTextColor="@color/colorwhite"

            app:layout_scrollFlags="enterAlways"

            />

        <android.support.design.widget.TabLayout

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            app:tabMaxWidth="0dp"

            app:tabGravity="fill"

            app:tabMode="fixed"

            android:id="@+id/tablayout_id"

            android:textAlignment="center"

            app:tabTextAppearance="@style/tabtextsize"

            app:tabSelectedTextColor="@color/tabindicatorcolor"

            app:tabTextColor="@color/tabtextcolor"

            app:tabIndicatorColor="@color/tabindicatorcolor"

            android:background="@color/colorPrimary"/>

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

        <!--设置fillViewport属性为true使viewpager可见-->

        <!--包含可滑动的布局内容(RecyclerView,NestedScrollView,不支持ListView，ScrollView，ViewPager),但是可以在NestedScrollView中使用

       必须要设置app:layout_behavior="@string/appbar_scrolling_view_behavior" (布局行为)

       属性来告知CoordinatorLayout该组件是带有滑动行为的组件,

       然后CoordinatorLayout在接受到滑动时会通知AppBarLayout中可滑动的Toolbar可以滑出屏幕-->

    <android.support.v4.widget.NestedScrollView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        app:layout_behavior="@string/appbar_scrolling_view_behavior"

        android:fillViewport="true"

        >

        <android.support.v4.view.ViewPager

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:id="@+id/viewpager_id">

        </android.support.v4.view.ViewPager>

    </android.support.v4.widget.NestedScrollView>

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

    </android.support.constraint.ConstraintLayout>