blocks|key|3922729|text|仰角要求设备运行棒棒糖。关于如何模拟高程https://stackoverflow.com/a/26747592/680249，请参阅这个答案|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3922730|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/26747592/680249^0|K|17|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]]]]

Elevation requires the device to run Lollipop. See this answer on how to simulate elevation <a href="https://stackoverflow.com/a/26747592/680249">https://stackoverflow.com/a/26747592/680249</a>

blocks|key|2262640|text|更新了+:：|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2262641|最佳实践要做到这一点就是
+
并添加卡纸图库
依赖{+..。编译‘com.android.Support:cardview+v7:21.0.%2B’}|ordered-list-item|2262642|在预Lollipop上，您可以使用这个可绘制的。
android:background="@android:drawable/dialog_holo_light_frame“
它会给你的仰角的外观|2262643|你可以像这样创建你自己的|2262644|2262645|2262646|reference|2262647|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/25683148/3879847^0|0|3|0|0|4|0|1|9|J|4|2K|3|0|0|0|0|0|9|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|I|3|J|5|H|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|K|3|L|5|H|7|1B|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1C|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|1E|8|@]|D|@$9|1F|A|1G|1|1H]]|E|$]]|$1|Q|3|-4|5|6|7|1I|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

UPDATED ::

<ol>
<li>Best Practice to do that is 

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

and add library for cardview

<pre><code>dependencies {
 ...
 compile 'com.android.support:cardview-v7:21.0.+'
 }
</code></pre></li>
<li>On Pre-Lollipop you can use this drawable

android:background="@android:drawable/dialog_holo_light_frame"

it will give you the look of elevation</li>
<li>you can create your own like this

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

&lt;item&gt;
&lt;shape android:shape="rectangle"&gt;
 &lt;solid android:color="#BDBDBD"/&gt;
 &lt;corners android:radius="5dp"/&gt;
&lt;/shape&gt;
&lt;/item&gt;

&lt;item
android:left="0dp"
android:right="0dp"
android:top="0dp"
android:bottom="2dp"&gt;
&lt;shape android:shape="rectangle"&gt;
 &lt;solid android:color="#ffffff"/&gt;
 &lt;corners android:radius="5dp"/&gt;
&lt;/shape&gt;
&lt;/item&gt;
&lt;/layer-list&gt;
</code></pre></li>
</ol>

<a href="https://stackoverflow.com/a/25683148/3879847">reference</a>

blocks|key|3500518|text|您还可以使用支持库中的CardView来实现曲面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3500519|为此，请向build.gradle添加一个依赖项：|3500520|compile+'com.android.support:cardview-v7:23.1.1'|code-block|syntax|javascript|3500521|然后简单地在布局中使用它：|3500522|++<android.support.v7.widget.CardView
++++++android:layout_width="match_parent"
++++++android:layout_height="150dp"
++++++android:layout_margin="16dp"
++++++android:background="#fff"
++++++>
++</android.support.v7.widget.CardView>|3500523|在这里，与使用@android:drawable/dialog_holo_light_frame作为背景相比，您可以更多地定制它。|offset|length|style|CODE|3500524|编辑：|3500525|还请注意，这种方法允许简单地实现|BOLD|3500526|材料设计上的预棒棒糖装置。|3500527|你可以改变海拔，|3500528|绕过拐角等。|3500529|要做到这一点，你必须：|3500530|+app:cardElevation="8dp"
+app:cardCornerRadius="8dp"
+app:contentPadding="5dp">|3500531|并且不要忘记将xmlns:app="http://schemas.android.com/apk/res-auto"添加到根布局中。|3500532|此外，您还可以轻松地更改代码中的高度：|3500533|CardView+card+=+(CardView)+findViewById(R.id.yourPreetyCoolCardView);
card.setCardElevation(getResources()
++++.getDimension(R.dimen.card_picked_up_elevation));|3500534|使用8dp作为拾取，2dp用于休息(通常)状态，您将是非常棒的。|3500535|entityMap^0|0|0|0|0|0|7|15|0|0|5|6|0|4|8|0|0|0|0|0|7|1F|0|0|0|2|3|A|3|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1I|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1J|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|1K|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|1L|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|1M|8|@$O|1N|P|1O|Q|R]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1P|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1Q|8|@$O|1R|P|1S|Q|W]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1T|8|@$O|1U|P|1V|Q|W]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1W|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|1X|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|15|3|16|5|F|7|1Z|8|@]|9|@]|A|$G|H]]|$1|17|3|18|5|6|7|20|8|@$O|21|P|22|Q|R]]|9|@]|A|$]]|$1|19|3|1A|5|6|7|23|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|F|7|24|8|@]|9|@]|A|$G|H]]|$1|1D|3|1E|5|6|7|25|8|@$O|26|P|27|Q|R]|$O|28|P|29|Q|R]]|9|@]|A|$]]|$1|1F|3|-4|5|6|7|2A|8|@]|9|@]|A|$]]]|1G|$]]

You can also use a CardView from the support library 
to implement surfaces. 
To do so add a dependency to your build.gradle: 

<pre><code>compile 'com.android.support:cardview-v7:23.1.1'
</code></pre>

And then simply use it in your layouts:

<pre><code> &lt;android.support.v7.widget.CardView
 android:layout_width="match_parent"
 android:layout_height="150dp"
 android:layout_margin="16dp"
 android:background="#fff"
 &gt;
 &lt;/android.support.v7.widget.CardView&gt;
</code></pre>

Here you have a quite more options to customise it comparing to 
using <code>@android:drawable/dialog_holo_light_frame</code> as a background

EDIT: 
Also notice, that this approach allows you to simply implement 
Material Design on Pre-Lolipop devices. 
You can change the elevation, 
round the corners etc. 
To do so you have to:

<pre><code> app:cardElevation="8dp"
 app:cardCornerRadius="8dp"
 app:contentPadding="5dp"&gt;
</code></pre>

And not forget to add <code>xmlns:app="http://schemas.android.com/apk/res-auto"</code>
to the root layout.

Also you can easily change the elevation in your code:

<pre><code>CardView card = (CardView) findViewById(R.id.yourPreetyCoolCardView);
card.setCardElevation(getResources()
 .getDimension(R.dimen.card_picked_up_elevation));
</code></pre>

Use <code>8dp</code> for picked up and <code>2dp</code> for resting (usual) state and you will be awesome.

blocks|key|2262741|text|正如所描述的here，您可以通过以下方式来模拟前棒棒糖的高度：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2262742|+android:background="@android:drawable/dialog_holo_light_frame"|code-block|syntax|javascript|2262743|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/30931750/8460132^0|6|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

As described <a href="https://stackoverflow.com/a/30931750/8460132">here</a>, you can mimic the elevation on pre-lollipop with:

<pre><code> android:background="@android:drawable/dialog_holo_light_frame"
</code></pre>

I'm trying to use <code>"android: elevation ="</code> in my application but once I run it does not appear in the device with android 4.1.2

gradle

<pre><code>apply plugin: 'com.android.application'

android {
 compileSdkVersion 21
 buildToolsVersion "21.1.2"

 defaultConfig {
 applicationId "com.example.alvaro.proyectocaronte"
 minSdkVersion 14
 targetSdkVersion 21
 versionCode 1
 versionName "1.0"
 }
 buildTypes {
 release {
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 }
 }
}

dependencies {
 compile fileTree(dir: 'libs', include: ['*.jar'])
 compile 'com.android.support:appcompat-v7:21.0.3'
}
</code></pre>

layout.xml

<pre><code>&lt;RelativeLayout
 android:layout_width="1100dp"
 android:layout_height="fill_parent"
 android:background="@drawable/rounded_corner"
 android:layout_alignParentTop="true"
 android:layout_alignParentRight="true"
 android:layout_alignParentEnd="true"
 android:layout_marginRight="93dp"
 android:layout_marginEnd="93dp"
 android:elevation="3dp"/&gt;
</code></pre>

maybe I'm not compiling correctly Lollipop for pre-lollipop devices, Any suggestions?

If you need to see other parts of the code, I'll edit the question

Thanks

"android:elevation=" doesn't work on devices pre-Lollipop with compile API21

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我试图在我的应用程序中使用"android: elevation ="，但是一旦运行，它就不会出现在带有Android4.1.2的设备中。gradleapply plugin: 'com.android.application'android {    compileSdkVersion 21    buildTool...

问"android:elevation=“不适用于具有编译API21的设备
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问"android:elevation=“不适用于具有编译API21的设备EN