blocks|key|146888|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|146889|ViewCompat.setElevation()/getElevation()无法在pre上工作Lollipop.|unordered-list-item|146890|There没有任何值得在支持库中查看的内容，至少在21.1.1版之前是这样的|146891|至于自己创建一个立面效果请看一下this|offset|length|146892|146893|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/21211870/android-view-shadow^0|0|0|0|G|4|0|0|0^^$0|@$1|2|3|-4|4|5|6|S|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|T|7|@]|8|@]|9|$]]|$1|D|3|E|4|C|6|U|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|V|7|@]|8|@$H|W|I|X|1|Y]]|9|$]]|$1|J|3|-4|4|5|6|Z|7|@]|8|@]|9|$]]|$1|K|3|-4|4|5|6|10|7|@]|8|@]|9|$]]]|L|$M|$4|N|O|P|9|$Q|R]]]]

<ul>
<li>ViewCompat.setElevation()/getElevation() doesnt work on pre Lollipop.</li>
<li>There isnt anything worth checking out at the support library, at least until version 21.1.1 </li>
<li>As for creating an elevation effect by yourself
take a look at
<a href="https://stackoverflow.com/questions/21211870/android-view-shadow">this</a></li>
</ul>

blocks|key|2936692|text|如果您想以3D形状设置视图，View.setElevation()和View.setTranslationZ()是一个好主意。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2936693|但不幸的是，这两个属性和方法是从Android+API+21开始引入的。因此，您不能在pre-L或API+21-设备上使用它们。|2936694|但是，仍然有一种方法可以自定义视图的阴影和轮廓。|2936695|视图背景可绘制的边界决定了其阴影的默认形状。轮廓表示图形对象的外部形状，并定义触摸反馈的波纹区域。|2936696|考虑这个视图，定义了一个可绘制的背景：|2936697|<TextView
android:id="@%2Bid/myview"
...
android:elevation="2dp"
android:background="@drawable/myrect"+/>|code-block|syntax|javascript|2936698|背景可绘制定义为具有圆角的矩形：|2936699|
<shape+xmlns:android="http://schemas.android.com/apk/res/android"
+++++++android:shape="rectangle">
++++<solid+android:color="#42000000"+/>
++++<corners+android:radius="5dp"+/>
</shape>|2936700|视图投射带有圆角的阴影，因为可绘制的背景定义了视图的轮廓。提供自定义轮廓会覆盖视图阴影的默认形状。|2936701|要在代码中定义视图的自定义大纲，请执行以下操作：|2936702|使用View.setOutlineProvider()方法将method.|2936703|Assign+|unordered-list-item|2936704|+ViewOutlineProvider新大纲提供程序的getOutline()扩展到视图。|ordered-list-item|2936705|2936706|2936707|可以使用Outline类中的方法创建具有圆角的椭圆形和矩形轮廓。视图的默认大纲提供程序从视图的背景中获取大纲。若要防止视图投射阴影，请将其大纲提供程序设置为null。|2936708|希望这能有所帮助。|2936709|附言:如果您正在使用android-design-library.，+yourAppNs:elevation="4dp"将是一个好主意|BOLD|2936710|entityMap^0|E|J|Y|M|0|0|0|0|0|0|0|0|0|0|2|P|0|0|1|J|S|C|0|0|0|4|7|26|4|0|0|0|Y|Z|P|0^^$0|@$1|2|3|4|5|6|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1P|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1R|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1S|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|6|7|1T|8|@]|D|@]|E|$]]|$1|U|3|V|5|P|7|1U|8|@]|D|@]|E|$Q|R]]|$1|W|3|X|5|6|7|1V|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1W|8|@]|D|@]|E|$]]|$1|10|3|11|5|6|7|1X|8|@$9|1Y|A|1Z|B|C]]|D|@]|E|$]]|$1|12|3|13|5|14|7|20|8|@]|D|@]|E|$]]|$1|15|3|16|5|17|7|21|8|@$9|22|A|23|B|C]|$9|24|A|25|B|C]]|D|@]|E|$]]|$1|18|3|-4|5|6|7|26|8|@]|D|@]|E|$]]|$1|19|3|-4|5|6|7|27|8|@]|D|@]|E|$]]|$1|1A|3|1B|5|6|7|28|8|@$9|29|A|2A|B|C]|$9|2B|A|2C|B|C]]|D|@]|E|$]]|$1|1C|3|1D|5|6|7|2D|8|@]|D|@]|E|$]]|$1|1E|3|1F|5|6|7|2E|8|@$9|2F|A|2G|B|1G]|$9|2H|A|2I|B|C]]|D|@]|E|$]]|$1|1H|3|-4|5|6|7|2J|8|@]|D|@]|E|$]]]|1I|$]]

If you want to set views in 3D shape, <code>View.setElevation()</code> and <code>View.setTranslationZ()</code> is a good idea. 

But unfortunately, the two attributes and methods are introduced since Android API 21. So, you can't use them on pre-L or API 21- devices.

But, there is still a way to custom your views' shadows and outlines.

The bounds of a view's background drawable determine the default shape of its shadow. Outlines represent the outer shape of a graphics object and define the ripple area for touch feedback.

Consider this view, defined with a background drawable:

<pre><code>&lt;TextView
android:id="@+id/myview"
...
android:elevation="2dp"
android:background="@drawable/myrect" /&gt;
</code></pre>

The background drawable is defined as a rectangle with rounded corners:

<pre><code>&lt;!-- res/drawable/myrect.xml --&gt;
&lt;shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle"&gt;
 &lt;solid android:color="#42000000" /&gt;
 &lt;corners android:radius="5dp" /&gt;
&lt;/shape&gt;
</code></pre>

The view casts a shadow with rounded corners, since the background drawable defines the view's outline. Providing a custom outline overrides the default shape of a view's shadow.

To define a custom outline for a view in your code:

<ol>
<li>Extend the <code>ViewOutlineProvider</code> class.</li>
<li>Override the <code>getOutline()</code> method.</li>
<li>Assign the new outline provider to your view with the
<code>View.setOutlineProvider()</code> method.</li>
</ol>

You can create oval and rectangular outlines with rounded corners using the methods in the <code>Outline</code> class. The default outline provider for views obtains the outline from the view's background. To prevent a view from casting a shadow, set its outline provider to <code>null</code>.

Hopefully it helps.

P.S.:
<code>yourAppNs:elevation="4dp"</code> will be a good idea if you are using android-design-library.

I'm working on an App and want to have an elevation effect on <code>ImageView</code> or any <code>View</code> (!CardView in support library) in Pre L APIs. But i'm not able to achieve that what i tried is used <code>android:elevation</code> property but it doesn't have any effect (No elevation).

I can't find any API, if someone point out any documentation to achieve this in Pre L or any snippet from Support library is highly appreciated.

Android L Elevation Effect in Pre L (only using elevation property)

Android

我正在开发一个应用程序，希望在Pre L API中对ImageView或任何View (支持库中的！CardView)有提升效果。但我无法实现我尝试使用的是android:elevation属性，但它没有任何效果(无提升)。我找不到任何API，如果有人指出任何用Pre实现这一点的文档或来自支持库的任何代码片段，我们将非...

问Pre L中的Android L Elevation效果(仅使用elevation属性)
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