blocks|key|58167|text|我最终为工具栏设置了自己的投影，认为这可能对任何寻找它的人都有帮助：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|58168|<LinearLayout+xmlns:android="http://schemas.android.com/apk/res/android"
++++++++++++++xmlns:app="http://schemas.android.com/apk/res-auto"
++++++++++++++android:layout_width="wrap_content"
++++++++++++++android:layout_height="wrap_content"
++++++++++++++android:layout_gravity="top"
++++++++++++++android:orientation="vertical">

++++<android.support.v7.widget.Toolbar+android:id="@%2Bid/toolbar"
+++++++++++++++++++++++++++++++++++++++android:layout_width="match_parent"
+++++++++++++++++++++++++++++++++++++++android:layout_height="wrap_content"
+++++++++++++++++++++++++++++++++++++++android:background="@color/color_alizarin"
+++++++++++++++++++++++++++++++++++++++android:titleTextAppearance="@color/White"
+++++++++++++++++++++++++++++++++++++++app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>

++++<FrameLayout+android:layout_width="match_parent"
+++++++++++++++++android:layout_height="match_parent">

++++++++

++++++++<View+android:layout_width="match_parent"
++++++++++++++android:layout_height="5dp"
++++++++++++++android:background="@drawable/toolbar_dropshadow"/>

++++</FrameLayout>

</LinearLayout>|code-block|syntax|javascript|58169|@drawable/工具栏_dropshadow：|58170|<?xml+version="1.0"+encoding="utf-8"?>
<shape+xmlns:android="http://schemas.android.com/apk/res/android"+
+++++++android:shape="rectangle">

++++<gradient+android:startColor="@android:color/transparent"
++++++++++++++android:endColor="#88333333"
++++++++++++++android:angle="90"/>

</shape>|58171|@color/color_alizarin|58172|<color+name="color_alizarin">#e74c3c</color>|58173|​|58174|📷|atomic|offset|length|58175|58176|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/3c57b3f75f42c6c4bb5d0c81f2d29099.png|imageAlt^0|0|0|0|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|16|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|17|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|18|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|19|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|1A|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|1B|8|@]|9|@]|A|$]]|$1|Q|3|R|5|S|7|1C|8|@]|9|@$T|1D|U|1E|1|1F]]|A|$]]|$1|V|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13|14|-4]]]]

I ended up setting my own drop shadow for the toolbar, thought it might helpful for anyone looking for it:

<pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_gravity="top"
 android:orientation="vertical"&gt;

 &lt;android.support.v7.widget.Toolbar android:id="@+id/toolbar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="@color/color_alizarin"
 android:titleTextAppearance="@color/White"
 app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/&gt;

 &lt;FrameLayout android:layout_width="match_parent"
 android:layout_height="match_parent"&gt;

 &lt;!-- **** Place Your Content Here **** --&gt;

 &lt;View android:layout_width="match_parent"
 android:layout_height="5dp"
 android:background="@drawable/toolbar_dropshadow"/&gt;

 &lt;/FrameLayout&gt;

&lt;/LinearLayout&gt;
</code></pre>

@drawable/toolbar_dropshadow:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;shape xmlns:android="http://schemas.android.com/apk/res/android" 
 android:shape="rectangle"&gt;

 &lt;gradient android:startColor="@android:color/transparent"
 android:endColor="#88333333"
 android:angle="90"/&gt;

&lt;/shape&gt;
</code></pre>

@color/color_alizarin

<pre><code>&lt;color name="color_alizarin"&gt;#e74c3c&lt;/color&gt;
</code></pre>

<img src="https://i.stack.imgur.com/X6h92.png" alt="enter image description here">

blocks|key|58200|text|如果您将ToolBar设置为ActionBar，则只需调用：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|58201|getSupportActionBar().setElevation(YOUR_ELEVATION);|code-block|syntax|javascript|58202|注意:必须在setSupportActionBar(toolbar);之后调用|58203|entityMap^0|4|7|E|9|0|0|6|T|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|T|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

If you are seting the <code>ToolBar</code> as <code>ActionBar</code> then just call:

<pre><code>getSupportActionBar().setElevation(YOUR_ELEVATION);
</code></pre>

Note: This must be called after <code>setSupportActionBar(toolbar);</code>

blocks|key|4564656|text|这对我来说非常有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4564657|<android.support.v7.widget.CardView
++++xmlns:card_view="http://schemas.android.com/apk/res-auto"
++++android:layout_width="match_parent"
++++android:layout_height="wrap_content"
++++android:background="@color/primary"
++++card_view:cardElevation="4dp"
++++card_view:cardCornerRadius="0dp">

++++<android.support.v7.widget.Toolbar
++++++++android:id="@%2Bid/toolbar"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="wrap_content"
++++++++android:background="@color/primary"
++++++++android:minHeight="?attr/actionBarSize"+/>

</android.support.v7.widget.CardView>|code-block|syntax|javascript|4564658|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This worked for me very well:

<pre><code>&lt;android.support.v7.widget.CardView
 xmlns:card_view="http://schemas.android.com/apk/res-auto"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="@color/primary"
 card_view:cardElevation="4dp"
 card_view:cardCornerRadius="0dp"&gt;

 &lt;android.support.v7.widget.Toolbar
 android:id="@+id/toolbar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="@color/primary"
 android:minHeight="?attr/actionBarSize" /&gt;

&lt;/android.support.v7.widget.CardView&gt;
</code></pre>

blocks|key|58295|text|在API+21+(Android棒棒糖)之前，不能使用elevation属性。但是，您可以通过编程方式添加阴影，例如，使用放置在工具栏下方的自定义视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|58296|@布局/工具栏|58297|<android.support.v7.widget.Toolbar
++++android:id="@%2Bid/toolbar"
++++android:layout_width="match_parent"
++++android:layout_height="wrap_content"
++++android:background="@color/blue"
++++android:minHeight="?attr/actionBarSize"
++++app:theme="@style/ThemeOverlay.AppCompat.ActionBar"+/>

<View
++++android:id="@%2Bid/toolbar_shadow"
++++android:layout_width="match_parent"
++++android:layout_height="3dp"
++++android:background="@drawable/toolbar_dropshadow"+/>|code-block|syntax|javascript|58298|​|58299|@drawable/工具栏_dropshadow|58300|<shape+xmlns:android="http://schemas.android.com/apk/res/android"+android:shape="rectangle">
++++<gradient
++++++++android:startColor="@android:color/transparent"
++++++++android:endColor="#88333333"
++++++++android:angle="90"/>+</shape>|58301|在activity+layout+<include+layout="@layout/toolbar"+/>中|offset|length|style|CODE|58302|58303|📷|atomic|58304|58305|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/5081027de8ab00dcdaa1c1bdb916c8fd.png|imageAlt^0|0|0|0|0|0|0|H|10|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|19|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1A|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1C|8|@]|9|@]|A|$]]|$1|M|3|N|5|F|7|1D|8|@]|9|@]|A|$G|H]]|$1|O|3|P|5|6|7|1E|8|@$Q|1F|R|1G|S|T]]|9|@]|A|$]]|$1|U|3|J|5|6|7|1H|8|@]|9|@]|A|$]]|$1|V|3|W|5|X|7|1I|8|@]|9|@$Q|1J|R|1K|1|1L]]|A|$]]|$1|Y|3|J|5|6|7|1M|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|16|17|-4]]]]

You can't use the elevation attribute before API 21 (Android Lollipop). You can however add the shadow programmatically, for example using a custom view placed below the Toolbar.

@layout/toolbar




<pre><code>&lt;android.support.v7.widget.Toolbar
 android:id="@+id/toolbar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="@color/blue"
 android:minHeight="?attr/actionBarSize"
 app:theme="@style/ThemeOverlay.AppCompat.ActionBar" /&gt;

&lt;View
 android:id="@+id/toolbar_shadow"
 android:layout_width="match_parent"
 android:layout_height="3dp"
 android:background="@drawable/toolbar_dropshadow" /&gt;
</code></pre>



@drawable/toolbar_dropshadow

<pre><code>&lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"&gt;
 &lt;gradient
 android:startColor="@android:color/transparent"
 android:endColor="#88333333"
 android:angle="90"/&gt; &lt;/shape&gt;
</code></pre>

in your activity layout
 <code>&lt;include layout="@layout/toolbar" /&gt;</code>

<img src="https://i.stack.imgur.com/xUWHC.png" alt="enter image description here">

blocks|key|58339|text|您还可以让它与RelativeLayout一起工作。这会稍微减少布局嵌套;)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|58340|<RelativeLayout
++++android:layout_width="match_parent"
++++android:layout_height="match_parent">

++++<include
++++++++android:id="@%2Bid/toolbar"
++++++++layout="@layout/toolbar"+/>

++++<FrameLayout
++++++++android:id="@%2Bid/container"
++++++++android:layout_width="match_parent"
++++++++android:layout_height="match_parent"
++++++++android:layout_below="@id/toolbar"+/>

++++<View
++++++++android:layout_width="match_parent"
++++++++android:layout_height="5dp"
++++++++android:layout_below="@id/toolbar"
++++++++android:background="@drawable/toolbar_shadow"+/>
</RelativeLayout>|code-block|syntax|javascript|58341|entityMap^0|7|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You can also make it work with <code>RelativeLayout</code>. This reduces layout nesting a little bit ;)

<pre><code>&lt;RelativeLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"&gt;

 &lt;include
 android:id="@+id/toolbar"
 layout="@layout/toolbar" /&gt;

 &lt;FrameLayout
 android:id="@+id/container"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:layout_below="@id/toolbar" /&gt;

 &lt;View
 android:layout_width="match_parent"
 android:layout_height="5dp"
 android:layout_below="@id/toolbar"
 android:background="@drawable/toolbar_shadow" /&gt;
&lt;/RelativeLayout&gt;
</code></pre>

blocks|key|58369|text|已经玩了几个小时了，这就是对我有效的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|58370|从appBarLayout和Toolbar小部件中删除所有elevation属性(如果您正在应用任何样式，则包括styles.xml+)。|offset|length|style|CODE|58371|现在，在活动中，在actionBar上应用elvation|58372|Toolbar+toolbar+=+(Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setElevation(3.0f);|code-block|syntax|javascript|58373|这应该是可行的。|58374|entityMap^0|0|1|C|E|7|T|9|1K|A|0|9|9|L|8|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@$D|13|E|14|F|G]|$D|15|E|16|F|G]]|9|@]|A|$]]|$1|J|3|K|5|L|7|17|8|@]|9|@]|A|$M|N]]|$1|O|3|P|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|19|8|@]|9|@]|A|$]]]|R|$]]

Was toying with this for hours, here's what worked for me.

Remove all the <code>elevation</code> attributes from the <code>appBarLayout</code> and <code>Toolbar</code> widgets (including <code>styles.xml</code> if you are applying any styling).

Now inside activity,apply the <code>elvation</code> on your <code>actionBar</code>:

<pre><code>Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setElevation(3.0f);
</code></pre>

This should work.

blocks|key|4564822|text|actionbar_background.xml|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4564823|++++<item>
++++++++<shape>
++++++++++++<solid+android:color="@color/black"+/>
++++++++++++<corners+android:radius="2dp"+/>
++++++++++++<gradient
++++++++++++++++android:startColor="@color/black"
++++++++++++++++android:centerColor="@color/black"
++++++++++++++++android:endColor="@color/white"
++++++++++++++++android:angle="270"+/>
++++++++</shape>
++++</item>

++++<item+android:bottom="3dp"+>
++++++++<shape>

++++++++++++<solid+android:color="#ffffff"+/>
++++++++++++<corners+android:radius="1dp"+/>
++++++++</shape>
++++</item>
</layer-list>|code-block|syntax|javascript|4564824|添加到actionbar_style背景|4564825|<style+name="Theme.ActionBar"+parent="style/Widget.AppCompat.Light.ActionBar.Solid">
++++<item+name="background">@drawable/actionbar_background</item>
++++<item+name="android:elevation">0dp</item>
++++<item+name="android:windowContentOverlay">@null</item>
++++<item+name="android:layout_marginBottom">5dp</item>|4564826|name="displayOptions">useLogo%7CshowHome%7CshowTitle%7CshowCustom|4564827|添加到基本主题|4564828|<style+name="BaseTheme"+parent="Theme.AppCompat.Light">
+++<item+name="android:homeAsUpIndicator">@drawable/home_back</item>
+++<item+name="actionBarStyle">@style/Theme.ActionBar</item>
</style>|4564829|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|D|7|Y|8|@]|9|@]|A|$E|F]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

actionbar_background.xml


 

<pre><code> &lt;item&gt;
 &lt;shape&gt;
 &lt;solid android:color="@color/black" /&gt;
 &lt;corners android:radius="2dp" /&gt;
 &lt;gradient
 android:startColor="@color/black"
 android:centerColor="@color/black"
 android:endColor="@color/white"
 android:angle="270" /&gt;
 &lt;/shape&gt;
 &lt;/item&gt;

 &lt;item android:bottom="3dp" &gt;
 &lt;shape&gt;

 &lt;solid android:color="#ffffff" /&gt;
 &lt;corners android:radius="1dp" /&gt;
 &lt;/shape&gt;
 &lt;/item&gt;
&lt;/layer-list&gt;
</code></pre>

add to actionbar_style background

<pre><code>&lt;style name="Theme.ActionBar" parent="style/Widget.AppCompat.Light.ActionBar.Solid"&gt;
 &lt;item name="background"&gt;@drawable/actionbar_background&lt;/item&gt;
 &lt;item name="android:elevation"&gt;0dp&lt;/item&gt;
 &lt;item name="android:windowContentOverlay"&gt;@null&lt;/item&gt;
 &lt;item name="android:layout_marginBottom"&gt;5dp&lt;/item&gt;
</code></pre>

name="displayOptions">useLogo|showHome|showTitle|showCustom
 

add to Basetheme

<pre><code>&lt;style name="BaseTheme" parent="Theme.AppCompat.Light"&gt;
 &lt;item name="android:homeAsUpIndicator"&gt;@drawable/home_back&lt;/item&gt;
 &lt;item name="actionBarStyle"&gt;@style/Theme.ActionBar&lt;/item&gt;
&lt;/style&gt;
</code></pre>

blocks|key|4564863|text|对于5.0以上版本:您可以将AppBarLayout与工具栏一起使用。AppBarLayout具有"elevation“属性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4564864|+<android.support.design.widget.AppBarLayout
++++++++android:id="@%2Bid/appbar"
++++++++android:layout_width="match_parent"
++++++++android:elevation="4dp"
++++++++android:layout_height="wrap_content"
++++++++android:orientation="vertical">
++++++++<include+layout="@layout/toolbar"+/>
++++</android.support.design.widget.AppBarLayout>|code-block|syntax|javascript|4564865|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

For 5.0 + : You can use AppBarLayout with Toolbar. AppBarLayout has "elevation" attribure.

<pre><code> &lt;android.support.design.widget.AppBarLayout
 android:id="@+id/appbar"
 android:layout_width="match_parent"
 android:elevation="4dp"
 android:layout_height="wrap_content"
 android:orientation="vertical"&gt;
 &lt;include layout="@layout/toolbar" /&gt;
 &lt;/android.support.design.widget.AppBarLayout&gt;
</code></pre>

blocks|key|4564872|text|我的阴影也有类似的问题。在我的例子中，阴影是由AppBarLayout的直接父级绘制的。如果父对象的高度与AppBarLayout的高度相同，则无法绘制阴影。因此，检查父布局的大小，也许重新制作布局可以解决这个问题。https://www.reddit.com/r/androiddev/comments/6xddb0/having_a_toolbar_as_a_fragment_the_shadow/|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4564873|entityMap|0|LINK|mutability|MUTABLE|url|https://www.reddit.com/r/androiddev/comments/6xddb0/having_a_toolbar_as_a_fragment_the_shadow/^0|30|2M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I had similar problem with the shadow. The shadow is drawn by direct parent of AppBarLayout in my case. If height of the parent is the same as AppBarLayout's the shadow cannot be drawn. So checking size of the parent layout and maybe layout remake can solve the problem. <a href="https://www.reddit.com/r/androiddev/comments/6xddb0/having_a_toolbar_as_a_fragment_the_shadow/" rel="nofollow noreferrer">https://www.reddit.com/r/androiddev/comments/6xddb0/having_a_toolbar_as_a_fragment_the_shadow/</a>

blocks|key|4564887|text|我添加了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4564888|<android.support.v7.widget.Toolbar
...
android:translationZ="5dp"/>|code-block|syntax|javascript|4564889|在工具栏描述中，它适用于我。使用5.0%2B|4564890|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

i added 

<pre class="lang-html prettyprint-override"><code>&lt;android.support.v7.widget.Toolbar
...
android:translationZ="5dp"/&gt;
</code></pre>

in toolbar description and it works for me.
Using 5.0+

blocks|key|58458|text|您所需要的只是一个等于android:elevation值的android:margin_bottom。不需要AppBarLayout、clipToPadding等。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|58459|示例：|58460|<?xml+version="1.0"+encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar
++++xmlns:android="http://schemas.android.com/apk/res/android"
++++android:id="@%2Bid/toolbar"
++++android:layout_width="match_parent"
++++android:layout_height="?attr/actionBarSize"
++++android:layout_marginBottom="4dp"
++++android:background="@android:color/white"
++++android:elevation="4dp">

++++<androidx.constraintlayout.widget.ConstraintLayout
++++++++android:layout_width="match_parent"
++++++++android:layout_height="match_parent">

++++++++

++++</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.Toolbar>|code-block|syntax|javascript|58461|entityMap^0|B|H|U|L|1J|C|1W|D|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]|$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|Y|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|N|$]]

All you need is a <code>android:margin_bottom</code> equal to the <code>android:elevation</code> value. No <code>AppBarLayout</code>, <code>clipToPadding</code>, etc. required.

Example:

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;androidx.appcompat.widget.Toolbar
 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/toolbar"
 android:layout_width="match_parent"
 android:layout_height="?attr/actionBarSize"
 android:layout_marginBottom="4dp"
 android:background="@android:color/white"
 android:elevation="4dp"&gt;

 &lt;androidx.constraintlayout.widget.ConstraintLayout
 android:layout_width="match_parent"
 android:layout_height="match_parent"&gt;

 &lt;!--Inner layout goes here--&gt;

 &lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;
&lt;/androidx.appcompat.widget.Toolbar&gt;
</code></pre>

blocks|key|58479|text|在我的情况下，elevation不能很好地工作，因为我没有给工具栏提供任何背景。试着给工具栏设置背景颜色，然后设置标高，这样就可以很好地工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|58480|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my situation elevation doesn't work well because I haven't given any background to the toolbar. Try giving background color to the toolbar then set elevation and it will work well.

blocks|key|4564966|text|Just+put++background
+<androidx.appcompat.widget.Toolbar
++++++++++++++++android:layout_width="match_parent"
++++++++++++++++android:elevation="8dp"
++++++++++++++++android:background="#fff"

++++++++++++++++android:layout_height="?android:attr/actionBarSize"></androidx.appcompat.widget.Toolbar>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4564967|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>Just put background
 &lt;androidx.appcompat.widget.Toolbar
 android:layout_width=&quot;match_parent&quot;
 android:elevation=&quot;8dp&quot;
 android:background=&quot;#fff&quot;

 android:layout_height=&quot;?android:attr/actionBarSize&quot;&gt;&lt;/androidx.appcompat.widget.Toolbar&gt;
</code></pre>

I'm updating my app with the new Toolbar from the support library v21. My problem is that the toolbar does not cast any shadow if I don't set the "elevation" attribute. Is that the normal behavior or I'm doing something wrong?

My code is:

<pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="fill_parent"
 android:layout_height="fill_parent"
 android:orientation="vertical"&gt;

 &lt;android.support.v7.widget.Toolbar
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:id="@+id/my_awesome_toolbar"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:background="?attr/colorPrimary"
 android:elevation="4dp"
 android:minHeight="?attr/actionBarSize"
 app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
 app:popupTheme="@style/ThemeOverlay.AppCompat.Light" /&gt;

 &lt;FrameLayout
 android:id="@+id/FrameLayout1"
 android:layout_width="match_parent"
 android:layout_height="match_parent"&gt;
 .
 .
 .
</code></pre>

And in my Activity - OnCreate method:

<pre><code> Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
 setSupportActionBar(toolbar);
</code></pre>

No shadow by default on Toolbar?

Android

我正在使用支持库v21中的新工具栏更新我的应用程序。我的问题是，如果我不设置"elevation“属性，工具栏就不会投射任何阴影。这是正常行为还是我做错了什么？我的代码是：<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" ...

问工具栏上是否默认没有阴影？
EN

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问工具栏上是否默认没有阴影？
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