如何修复TabLayout的顶部边缘

Question

从Chris Banes cheesesquare得出想法，我将视差效果和滑动标签结合起来。目前工具栏遮盖了Tablayout。如何在屏幕截图3中实现效果，其中标签位于工具栏下方，而不会低于它。

我的布局代码 -

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

<android.support.design.widget.AppBarLayout 
    android:id="@+id/appbar" 
    android:layout_width="match_parent" 
    android:layout_height="256dp" 
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> 

    <android.support.design.widget.CollapsingToolbarLayout 
     android:id="@+id/collapsing_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed"> 

     <android.support.design.widget.TabLayout 
      android:id="@+id/tabs" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:layout_gravity="bottom" 
      app:tabMode="scrollable" 
      app:tabContentStart="72dp" /> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:background="?attr/colorPrimary" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      app:layout_collapseMode="parallax" /> 

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

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

<android.support.v4.view.ViewPager 
    android:id="@+id/viewpager" 
    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="8dp" 
    android:src="@drawable/ic_done" 
    app:layout_anchor="@id/tabs" 
    app:layout_anchorGravity="center|left|start" 
    app:fabSize="mini" 
    app:layout_behavior="com.support.android.designlibdemo.ScrollAwareFABBehavior" 
    app:borderWidth="0dp" /> 

Answer 1

最后经过试验和错误的计算出来，我有以下输出达到我的满意。发布为社会其他部分的答案，会员可能有类似的要求

这里是模板文件

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

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

<android.support.design.widget.AppBarLayout 
    android:id="@+id/appbar" 
    android:layout_width="match_parent" 
    android:layout_height="@dimen/detail_backdrop_height" 
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" 
    android:fitsSystemWindows="true"> 

    <android.support.design.widget.CollapsingToolbarLayout 
     android:id="@+id/collapsing_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="206dip" 
     android:background="#ffcc66" 
     app:layout_scrollFlags="scroll|exitUntilCollapsed" 
     android:fitsSystemWindows="true" 
     app:contentScrim="?attr/colorPrimary" 
     app:expandedTitleMarginStart="48dp" 
     app:expandedTitleMarginBottom="20dp" 
     app:expandedTitleMarginEnd="64dp"> 

     <ImageView 
      android:id="@+id/backdrop" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      android:scaleType="centerCrop" 
      android:fitsSystemWindows="true" 
      app:layout_collapseMode="parallax" /> 

     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      app:layout_collapseMode="pin" /> 

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

    <android.support.design.widget.CollapsingToolbarLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     app:layout_scrollFlags="scroll|enterAlways"> 

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

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