AppBarLayout weirdly takes up space and pushes content down

Question

I am using the new Android Design library and the Toolbar auto-hide feature. Currently, auto-hide on scroll works fine. But having this problem, take a look at the screenshot below

As you can see, FloatingActionButton pushed a bit down .

code:

 <android.support.design.widget.CoordinatorLayout xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@android:id/home" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true"> <android.support.v7.widget android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" android:clipToPadding="false" android:paddingTop="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior"/> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:src="@drawable/ic_shuffle" style="@style/FabStyle"/> <android.support.design.widget.AppBarLayout android:id="@+id/appbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_scrollFlags="scroll|enterAlways" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/> </android.support.design.widget.AppBarLayout> </android.support.design.widget.CoordinatorLayout> 

FabSyle:

 <style name="FabStyle"> <item name="android:layout_width">wrap_content</item> <item name="android:layout_height">wrap_content</item> <item name="android:layout_gravity">bottom|end</item> <item name="android:layout_marginEnd">@dimen/activity_horizontal_margin</item> <item name="android:layout_marginBottom">@dimen/activity_vertical_margin</item> <item name="borderWidth">0dp</item> <item name="elevation">@dimen/fabElevation</item> <item name="pressedTranslationZ">@dimen/fabPressedZ</item> </style> 

I also tried too hard to add margin and padding bottom, which works, but when the list scrolls, it goes too up.

Best of all, when I play with an AppBarLayout that stops auto-hiding on a scroll for the Toolbar , then the FloatingActionButton looks good.

Answer 1

AppBarLayout expects the first child from CoordinatorLayout to work correctly. This article notes that:

AppBarLayout is currently expecting the first child invested in CoordinatorLayout according to official Google docs .

But apparently, the documents have changed since then (maybe the restriction no longer applies? I'm not sure). Try moving AppBarLayout to the first position as follows:

 <android.support.design.widget.CoordinatorLayout xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@android:id/home" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true"> <android.support.design.widget.AppBarLayout android:id="@+id/appbar" android:layout_width="match_parent" android:layout_height="wrap_content" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"> <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" app:layout_scrollFlags="scroll|enterAlways" android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/> </android.support.design.widget.AppBarLayout> <android.support.v7.widget android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" android:clipToPadding="false" android:paddingTop="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior"/> <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:src="@drawable/ic_shuffle" style="@style/FabStyle"/> </android.support.design.widget.CoordinatorLayout> 

Answer 2

You need to change the FAB as follows: -

 <android.support.design.widget.FloatingActionButton android:id="@+id/fab" android:src="@drawable/ic_shuffle" app:layout_anchor="@id/list" app:layout_anchorGravity="bottom|right|end" style="@style/FabStyle"/> 

Answer 3

for your RecyclerView

 <android.support.v7.widget.RecyclerView android:id="@+id/list" android:layout_width="match_parent" android:layout_height="match_parent" android:scrollbars="none" android:clipToPadding="false" android:paddingTop="@dimen/activity_vertical_margin" app:layout_behavior="@string/appbar_scrolling_view_behavior"/>