CollapsingToolbarLayout từ appcompat cho thấy bóng trong tình trạng sụp đổ, nhưng khi mở rộng (hoặc mở rộng trong quá trình) bóng biến mấtCollapsingToolbarLayout không có bóng trong tình trạng mở rộng
mã ví dụ của tôi https://github.com/NaikSoftware/CollapsingToolbarWithImageAndTabs/tree/master/app
Layout
<?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:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="ua.naiksoftware.hidetabs.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.design.widget.CollapsingToolbarLayout
android:layout_width="match_parent"
android:layout_height="@dimen/toolbar_plus_tabs"
app:contentScrim="@android:color/transparent"
app:layout_scrollFlags="scroll|exitUntilCollapsed|snap|enterAlways"
app:titleEnabled="false"
app:toolbarId="@+id/toolbar_wrapper">
<ImageView
android:id="@+id/appbar_background"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@drawable/header_back"
app:layout_collapseMode="parallax"/>
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="@android:color/transparent"
app:popupTheme="@style/AppTheme.PopupOverlay" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar_wrapper"
android:layout_width="match_parent"
android:layout_gravity="bottom"
android:background="@android:color/transparent"
android:layout_height="wrap_content"
android:minHeight="@dimen/tab_layout_height">
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/transparent"
app:tabGravity="fill"
app:tabIndicatorColor="@android:color/white"
app:tabMode="scrollable"
app:tabSelectedTextColor="@android:color/white" />
</android.support.v7.widget.Toolbar>
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_add_black_24dp"
android:layout_margin="@dimen/fab_margin"
android:tint="@android:color/white"
android:layout_gravity="bottom|end"
app:elevation="@dimen/fab_elevation"
app:layout_behavior="ua.naiksoftware.hidetabs.FabSlidingBehavior"/>
@Sjd Bạn đã tìm thấy giải pháp chưa? nếu không thì trả lời lại tôi sẽ đăng giải pháp. –