上滑 显示底部 下滑 隐藏顶部 协调者布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout
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/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
android:background="@color/main_activity_color"
tools:openDrawer="start">

<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
>

<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppLockAppBarOverlay">

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

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

<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior">

<android.support.v7.widget.RecyclerView
android:id="@+id/app_list"
android:layout_above="@+id/adView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical">

</android.support.v7.widget.RecyclerView>
<FrameLayout
android:id="@+id/adView"
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"></FrameLayout>
</RelativeLayout>

</android.support.design.widget.CoordinatorLayout>
</android.support.v4.widget.DrawerLayout>

主要是 app:layout_behavior="@string/appbar_scrolling_view_behavior"

<string name="appbar_scrolling_view_behavior" translatable="false">android.support.design.widget.AppBarLayout$ScrollingViewBehavior</string>

下面的应该是没有用到
<style name="AppLockAppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppLockPopupOverlay" parent="ThemeOverlay.AppCompat.Light" />app样式是
继承这个 

Theme.AppCompat.Light.DarkActionBar

<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>