android AppBarLayout,CollapsingToolbarLayout

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<?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:layout_width="match_parent"    android:layout_height="match_parent"    android:fitsSystemWindows="true">    <android.support.design.widget.AppBarLayout        android:id="@+id/app_bar"        android:layout_width="match_parent"        android:layout_height="300dp"        android:fitsSystemWindows="true"        >        <android.support.design.widget.CollapsingToolbarLayout            android:id="@+id/toolbar_layout"            android:layout_width="match_parent"            android:layout_height="match_parent"            android:fitsSystemWindows="true"            app:contentScrim="?attr/colorPrimary"            app:layout_scrollFlags="scroll|exitUntilCollapsed">            <android.support.v7.widget.Toolbar                android:id="@+id/toolbar"                android:layout_width="match_parent"                android:layout_height="?attr/actionBarSize"                app:layout_collapseMode="pin"                 />        </android.support.design.widget.CollapsingToolbarLayout>    </android.support.design.widget.AppBarLayout>    <android.support.v4.widget.NestedScrollView        android:layout_width="match_parent"        android:layout_height="match_parent"        app:layout_behavior="@string/appbar_scrolling_view_behavior"        >        <TextView            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_margin="10dp"            android:text="我是撒旦" />    </android.support.v4.widget.NestedScrollView>    <android.support.design.widget.FloatingActionButton        android:id="@+id/fab"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_margin="15dp"        android:src="@android:drawable/ic_dialog_email"        app:layout_anchor="@id/app_bar"        app:layout_anchorGravity="bottom|end" /></android.support.design.widget.CoordinatorLayout>
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