blocks|key|35320|text|选择另一个主题(不是Holo，例如Theme)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|35321|​|35322|📷|atomic|35323|35324|当您错误地创建样式或从现有样式创建样式时，通常会出现此问题。所以选择"Graphical+Layout“选择"AppTheme”(带蓝色星号的标签)。并选择任何预定义的样式。在我的例子中，"Light“应该可以解决这个问题。|35325|尝试“使缓存无效并重新启动”。|35326|35327|35328|35329|通过选择此选项重新启动Android+Studio。这可能需要一些时间。|35330|然后，如果仍然不起作用，试着重建你的项目。|35331|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c536f43bc6064de396986330b45ba357.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/8f1f215a001d34d5f743d2737a6f233d.png^0|A|4|H|5|0|0|0|1|0|0|0|0|0|0|0|1|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1C|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|1D|8|@]|D|@$9|1E|A|1F|1|1G]]|E|$]]|$1|K|3|G|5|6|7|1H|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1I|8|@]|D|@]|E|$]]|$1|N|3|O|5|6|7|1J|8|@]|D|@]|E|$]]|$1|P|3|G|5|6|7|1K|8|@]|D|@]|E|$]]|$1|Q|3|I|5|J|7|1L|8|@]|D|@$9|1M|A|1N|1|1O]]|E|$]]|$1|R|3|G|5|6|7|1P|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1Q|8|@]|D|@]|E|$]]|$1|U|3|V|5|6|7|1R|8|@]|D|@]|E|$]]|$1|W|3|-4|5|6|7|1S|8|@]|D|@]|E|$]]]|X|$Y|$5|Z|10|11|E|$12|13|14|-4]]|15|$5|Z|10|11|E|$12|16|14|-4]]]]

<h3>Choose another theme (other than <code>Holo</code>, for example <code>Theme</code>)</h3>
<img src="https://i.stack.imgur.com/FPDfL.png" alt="Solution Image" />
When you create the style incorrectly or from an existing style, this problem usually occurs. So select the &quot;Graphical Layout&quot; select &quot;AppTheme&quot; (The tab with a blue star). And select any of the predefined style. In my case &quot;Light&quot; which should resolve the problem.
<h3>Try to 'Invalidate caches &amp; restart'.</h3>
<img src="https://i.stack.imgur.com/TuDuo.png" alt="how to invalidate cache &amp; restart" />
Restart your Android Studio by choosing this option. It may take some time.
Then, if still doesn't work try to rebuild your project.

blocks|key|35333|text|从空白活动切换到使用空活动。将您的主题更改为例如Holo.Light.NoActionBar。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|35334|与空白不同的是，Empty更加精简，因此你可能需要自己添加一些东西。例如，如果您需要操作ActionBar上的控件，请自己添加两个覆盖方法onCreateOptionsMenu和onOptionsItemSelected。否则，没有其他显著差异。|35335|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Switch from Blank Activity and use Empty Activity. Change your theme to for example Holo.Light.NoActionBar. 

Unlike Blank, Empty is more stripped down thus you may need to add some stuff yourself. Such as add the 2 Override methods onCreateOptionsMenu and onOptionsItemSelected yourself if you need to manipulate controls on the ActionBar and such. Otherwise, no other significant difference.

blocks|key|34260|text|再次检查SDK更新，因为API+23:+Android+N+(preview)现在可用，请正确下载，或者从预览窗口的右上角选择API+23:+Android+6.0+。检查图像|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|34261|​|34262|📷|atomic|34263|。|34264|34265|它(Android+Studio)会自动选择最新的版本，即使它没有正确安装。所以，|34266|您需要做的是：|34267|34268|正确安装新版本|ordered-list-item|34269|34270|上一个的OR|34271|click。|unordered-list-item|34272|34273|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/54253543fd7e1ba2e87e03bc836fe23f.png|imageAlt^0|C|R|1R|J|2B|5|C|R|1R|J|0|0|1|0|0|1|0|1|0|0|0|1|0|0|1|0|0|15|0|0|7|0|0|0|7|0|0|0|6|0|0|6|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]|$9|1H|A|1I|B|C]|$9|1J|A|1K|B|D]|$9|1L|A|1M|B|D]]|E|@]|F|$]]|$1|G|3|H|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|E|@]|F|$]]|$1|I|3|J|5|K|7|1Q|8|@$9|1R|A|1S|B|C]]|E|@$9|1T|A|1U|1|1V]]|F|$]]|$1|L|3|M|5|6|7|1W|8|@$9|1X|A|1Y|B|C]]|E|@]|F|$]]|$1|N|3|M|5|6|7|1Z|8|@$9|20|A|21|B|C]]|E|@]|F|$]]|$1|O|3|P|5|6|7|22|8|@$9|23|A|24|B|C]]|E|@]|F|$]]|$1|Q|3|R|5|6|7|25|8|@$9|26|A|27|B|C]]|E|@]|F|$]]|$1|S|3|-4|5|6|7|28|8|@]|E|@]|F|$]]|$1|T|3|U|5|V|7|29|8|@$9|2A|A|2B|B|C]]|E|@]|F|$]]|$1|W|3|-4|5|6|7|2C|8|@]|E|@]|F|$]]|$1|X|3|Y|5|6|7|2D|8|@$9|2E|A|2F|B|C]]|E|@]|F|$]]|$1|Z|3|10|5|11|7|2G|8|@$9|2H|A|2I|B|C]]|E|@]|F|$]]|$1|12|3|-4|5|6|7|2J|8|@]|E|@]|F|$]]|$1|13|3|-4|5|6|7|2K|8|@]|E|@]|F|$]]]|14|$15|$5|16|17|18|F|$19|1A|1B|-4]]]]

Check again for SDK update because <code>API 23: Android N (preview)</code> is now available, download it properly OR select the <code>API 23: Android 6.0</code> from the top right of the preview window. check the image 

<a href="https://i.stack.imgur.com/ubQH4.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ubQH4.png" alt="enter image description here"></a>
. 
. 
It (Android Studio) automatically selects the latest one even if it not properly installed. So,

What you need to do is :

<ol>
<li>install the new one properly

OR</li>
<li>click on the previous one.</li>
</ol>

blocks|key|33439|text|更改要在IDE中呈现布局时使用的Android版本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33440|转到您的xml布局文件sdk+->将Android+API版本从自动选择最佳更改为您的最低版本和目标版本之间的一个值。|33441|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Change the Android version to use while rendering layouts in the IDE. 

Go to your xml layout file -> Design -> change Android API version from Automatically Pick Best to a value in between your minimum and target sdk versions.

blocks|key|33800|text|通过转到build+>+Clean+build来清理构建您的项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33801|当我遇到同样的问题时，它对我很有帮助。|33802|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Clean build your project by going to Build > Clean build.

It helped me when I had the same problem.

blocks|key|33465|text|强制刷新帮了我。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33466|它位于设计选项卡的顶部。|33467|​|33468|📷|atomic|offset|length|33469|33470|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/781cb01f36ff531f66a43030ff8a3027.png|imageAlt^0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@$I|Y|J|Z|1|10]]|A|$]]|$1|K|3|E|5|6|7|11|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]]]

Force refresh helped me.

It is at the top of the design tab.

<a href="https://i.stack.imgur.com/zWLPZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/zWLPZ.png" alt="enter image description here"></a>

blocks|key|35378|text|快进到2018年，我们仍然有这个问题！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|35379|当我今天在Android+Studio+Canary+3.2遇到这个问题时，我是这样做的：|offset|length|style|CODE|35380|我去了|35381|File+->+Settings+->+Plugins|35382|在插件列表中，我通过取消选中Android+Support来禁用它。|35383|然后，我选择Apply，然后选择OK。|BOLD|35384|在此之后，我重新启动了Android+Studio。|35385|在重新启动时，我重复了这个过程：|35386|File+->+Settings+->+Plugins|code-block|syntax|javascript|35387|但这一次，在插件列表中，我通过选中它来启用Android+Support。|35388|然后我又重新启动了。|35389|当Android+Studio出现的时候，我允许Gradle做它自己的事情，然后我做了：|35390|File+->+Sync+Project+with+Gradle+Files|35391|完成后，我重新打开或刷新了xml文件，一切都很正常。|35392|是啊，路途很长，但我得在上班的时候接生？它肯定是有效的！|35393|Android+TLDR：只需禁用并重新启用对的支持，一切都会好起来的|35394|entityMap^0|0|5|P|0|0|0|R|0|E|F|0|6|5|G|2|0|B|E|0|0|0|L|F|0|0|1|E|O|6|0|0|0|0|N|C|0^^$0|@$1|2|3|4|5|6|7|1F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1G|8|@$D|1H|E|1I|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|1J|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1K|8|@$D|1L|E|1M|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|1N|8|@$D|1O|E|1P|F|G]]|9|@]|A|$]]|$1|N|3|O|5|6|7|1Q|8|@$D|1R|E|1S|F|P]|$D|1T|E|1U|F|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1V|8|@$D|1W|E|1X|F|G]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|U|3|V|5|W|7|1Z|8|@]|9|@]|A|$X|Y]]|$1|Z|3|10|5|6|7|20|8|@$D|21|E|22|F|G]]|9|@]|A|$]]|$1|11|3|12|5|6|7|23|8|@]|9|@]|A|$]]|$1|13|3|14|5|6|7|24|8|@$D|25|E|26|F|G]|$D|27|E|28|F|G]]|9|@]|A|$]]|$1|15|3|16|5|W|7|29|8|@]|9|@]|A|$X|Y]]|$1|17|3|18|5|6|7|2A|8|@]|9|@]|A|$]]|$1|19|3|1A|5|6|7|2B|8|@]|9|@]|A|$]]|$1|1B|3|1C|5|6|7|2C|8|@$D|2D|E|2E|F|P]]|9|@]|A|$]]|$1|1D|3|-4|5|6|7|2F|8|@]|9|@]|A|$]]]|1E|$]]

Fast Forward to 2018 and we are still having this issue!

When I had this issue with <code>Android Studio Canary 3.2</code> today, this is what I did:

I went to 

<code>File -&gt; Settings -&gt; Plugins</code>

On the plugins list, I disabled <code>Android Support</code> by unchecking it.

Then, I selected Apply and then, OK.

After this I restarted <code>Android Studio</code>.

On restart, I repeated the process:

<pre><code>File -&gt; Settings -&gt; Plugins
</code></pre>

But this time, on the plugins list, I enabled <code>Android Support</code> by checking it.

Then I restarted.

When <code>Android Studio</code> came on, I allowed <code>Gradle</code> do its thing, then I did:

<pre><code>File -&gt; Sync Project with Gradle Files
</code></pre>

When this was done, I reopened my xml files or refreshed them anyhow possible
and everything was fine.

Yeah long route, but on a day when I have to deliver at work? It sure works!

TLDR: Just disable and re-enable Android Support and you will be fine

blocks|key|35421|text|这是一个常见的问题。只需将res/values/styles.xml更改为|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|CODE|entityRanges|data|35422|
<style+name="AppTheme"+parent="Base.Theme.AppCompat.Light.DarkActionBar">
++++
</style>|code-block|syntax|javascript|35423|步骤：|35424|35425|转到res/values/|unordered-list-item|35426|open+styles.xml|35427|35428|-+change+from+->+style+name="AppTheme"+parent="**Theme.AppCompat.Light.DarkActionBar**"
-+change+to+->+style+name="AppTheme"+parent="**Base.Theme.AppCompat.Light.DarkActionBar**"|35429|(只需将"Base.“前缀为”Theme“即可。)|35430|35431|保存文件并选中立即预览。|35432|预览Works+Perfeclty。|35433|35434|entityMap^0|D|L|D|L|0|0|0|0|0|0|0|0|5|5|F|5|0|0|0|2|5|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|1B|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|1C|8|@]|E|@]|F|$]]|$1|N|3|-4|5|6|7|1D|8|@]|E|@]|F|$]]|$1|O|3|P|5|Q|7|1E|8|@]|E|@]|F|$]]|$1|R|3|S|5|Q|7|1F|8|@]|E|@]|F|$]]|$1|T|3|-4|5|6|7|1G|8|@]|E|@]|F|$]]|$1|U|3|V|5|I|7|1H|8|@]|E|@]|F|$J|K]]|$1|W|3|X|5|6|7|1I|8|@$9|1J|A|1K|B|C]|$9|1L|A|1M|B|C]]|E|@]|F|$]]|$1|Y|3|-4|5|6|7|1N|8|@]|E|@]|F|$]]|$1|Z|3|10|5|Q|7|1O|8|@]|E|@]|F|$]]|$1|11|3|12|5|Q|7|1P|8|@$9|1Q|A|1R|B|C]]|E|@]|F|$]]|$1|13|3|-4|5|6|7|1S|8|@]|E|@]|F|$]]|$1|14|3|-4|5|6|7|1T|8|@]|E|@]|F|$]]]|15|$]]

This is a common problem . It can be easily solved by changing <code>res/values/styles.xml</code> to

<pre><code>&lt;!-- Base application theme. --&gt;
&lt;style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"&gt;
 &lt;!-- Customize your theme here. --&gt;
&lt;/style&gt;
</code></pre>

<h3>Steps :</h3>

<ul>
<li>Go to res/values/</li>
<li>open styles.xml

<ul>
<li>change from -> style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"</li>
<li>change to -> style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"</li>
</ul>

(Just prepend "Base." to "Theme".)</li>
</ul>

 

<ul>
<li>Save the file and check Preview now.</li>
<li>Preview Works Perfeclty now.</li>
</ul>

blocks|key|34396|text|我也遇到了同样的问题，只需转到res->values->style.xml并更改|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34397|<style+name="AppTheme"+parent="Theme.AppCompat.Light.DarkActionBar">+|code-block|syntax|javascript|34398|至|34399|<style+name="AppTheme"+parent="Base.Theme.AppCompat.Light.DarkActionBar">|34400|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I also go through same problem and do this simple work just go to res->values->style.xml and change 

<pre><code>&lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt; 
</code></pre>

to 

<pre><code>&lt;style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"&gt;
</code></pre>

blocks|key|35507|text|这是一个对我有效的简单解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|35508|35509|转到位于右下角的File+->+Settings+->+Apperance+&+Behavior+->+System+Settings+->+Android+SDK+:|ordered-list-item|offset|length|style|CODE|35510|Check+Show+Package+Details。|35511|在最新的Android+SDK版本下(例如：Android+8.1+(Oreo))，检查Google+Play+Intel+x86+Atom+System+Image+|35512|现在单击<代码>D12按钮|35513|35514|该系统镜像帮助android+studio展示布局预览。|35515|entityMap^0|0|0|8|24|0|6|K|0|M|I|18|13|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|W|8|@$F|X|G|Y|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|Z|8|@$F|10|G|11|H|I]]|9|@]|A|$]]|$1|L|3|M|5|E|7|12|8|@$F|13|G|14|H|I]|$F|15|G|16|H|I]]|9|@]|A|$]]|$1|N|3|O|5|E|7|17|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|T|$]]

Here is a simple solution that worked for me:

<ol>
<li>Go to <code>File -&gt; Settings -&gt; Apperance &amp; Behavior -&gt; System Settings -&gt; Android SDK :</code></li>
<li>Check <code>Show Package Details</code> which is located on the bottom right.</li>
<li>Under the latest Android SDK version (for ex: <code>Android 8.1 (Oreo)</code>), check <code>Google Play Intel x86 Atom System Image</code> </li>
<li>Now click <code>apply</code> button </li>
</ol>

This system image helps android studio to show layout preview.

blocks|key|33608|text|当我开始我的第一个项目时，它甚至没有在预览中显示"Hello+World“，只显示”渲染问题“和”无法实例化一个或多个类“。这对我很有帮助，试试这个.在左侧菜单中，GoTo|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33609|+base->+res->+values->+styles.xml|code-block|syntax|javascript|33610|然后写下“Base”。在<style+name="AppTheme"+parent="Theme.AppCompat.Light.DarkActionBar">行中|offset|length|style|CODE|33611|就在Theme.AppCompat+(即<style+name="AppTheme"+parent="Base.Theme.AppCompat.Light.DarkActionBar">+)之前|33612|entityMap^0|0|0|C|1W|0|K|21|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@$I|W|J|X|K|L]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|P|$]]

It doesn't even show the "Hello World" in the preview when i started my first project,only displays 'Rendering problem' and 'Failed to instantiates one or more class'.This helps me out, try this.....
in the left side menu, GoTo 
 base-> res-> values-> styles.xml 
then write "Base." in the line <code>&lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;</code> 
just before the Theme.AppCompat i.e <code>&lt;style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"&gt;</code>

blocks|key|2500260|text|将主题从AppTheme改为DeviceDefault或Holo之类的主题(在安卓符号附近表示更改应用程序接口版本)可以轻松解决问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2500261|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|$]]

Changing the theme(near the android symbol for changing API version) from AppTheme to anything else like DeviceDefault or Holo fixed the problem easily.

blocks|key|34460|text|只需通过单击此按钮刷新您的布局：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34461|在“layout-”页面的左上方会有一个蓝色的徽标|offset|length|style|BOLD|34462|单击并选择“强制刷新布局”|34463|​|34464|📷|atomic|34465|34466|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/07e0d16851bcf0e905360ff1cf547443.png|imageAlt^0|0|9|G|0|0|D|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|15|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|16|8|@]|9|@$D|17|E|18|1|19]]|A|$]]|$1|O|3|K|5|6|7|1A|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]]]

just refresh your layout by clicking this:

there will be a blue logo at the top left of the "layout-design" page

click and choose "Force Refresh Layout"

<a href="https://i.stack.imgur.com/5cDB0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5cDB0.png" alt="enter image description here"></a>

blocks|key|2500306|text|当我创建一个新项目时，我遇到了一个确切的问题，它似乎与Appcompat库有关，以解决它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2500307|我用implementation+'com.android.support:appcompat-v7:27.1.1'替换了：implementation+'com.android.support:appcompat-v7:28.0.0-alpha3'，一切都很好。|offset|length|style|CODE|2500308|总而言之，这个问题与库版本中的一个bug有关。|2500309|但是，如果有必要使用Natesh+bhat，那么它的解决方案就是为您准备的。|2500310|entityMap^0|0|2|1K|1Q|1R|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|M|$]]

I faced the exact problem when creating a new project, It seams to be related to the Appcompat Library to solve it:

I replaced : <code>implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'</code> by <code>implementation 'com.android.support:appcompat-v7:27.1.1'</code> And everything worked fine.

In conclusion, The problem is related to a bug in the library version.

But if it is necessary to use the Natesh bhat's solution is for you.

blocks|key|33682|text|在值中查找Styles.xml。(res/Values/Styles.xml)更改此设置|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33683|<style+name="AppTheme"+parent="Theme.AppCompat.Light.DarkActionBar">|code-block|syntax|javascript|33684|要这样做：|33685|<style+name="AppTheme"+parent="Base.Theme.AppCompat.Light.DarkActionBar">|33686|然后清理并构建项目。这两个都可以从build菜单中完成。|33687|这对我很管用。|33688|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

Find Styles.xml in Values.(res/Values/Styles.xml)
Change this

<pre><code>&lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
</code></pre>

to this:

<pre><code>&lt;style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"&gt;
</code></pre>

Then clean and build project. Both of those you can do from build menu. 

It worked for me.

blocks|key|2500330|text|在我的例子中，Android+Studio创建了一个项目，其中包括版本为RC或beta的支持库。所以我尝试了降级支持库的版本，然后工作了。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2500331|如果您的库版本是RC或测试版，请尝试。|BOLD|2500332|将此降级|2500333|implementation+'com.android.support:appcompat-v7:28.0.0-rc01'|2500334|到这个|2500335|implementation+'com.android.support:appcompat-v7:27.1.1'|2500336|如果你需要，也可以降级compileSdkVersion，targetSdkVersion。|2500337|entityMap^0|10|2|13|4|0|I|1|0|0|0|1P|0|0|0|1K|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|H]]|D|@]|E|$]]|$1|I|3|J|5|6|7|12|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|16|8|@]|D|@]|E|$]]|$1|O|3|P|5|6|7|17|8|@$9|18|A|19|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1A|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|T|$]]

In my case, Android Studio created project including support library which version is <code>RC</code> or <code>beta</code>.
So I tried downgrade version of support library, then worked. 
If your library version is RC or beta, try downgrade.

Downgrade this 
<code>implementation 'com.android.support:appcompat-v7:28.0.0-rc01'</code>

to this 
<code>implementation 'com.android.support:appcompat-v7:27.1.1'</code>

and downgrade also compileSdkVersion, targetSdkVersion if you need.

blocks|key|2500363|text|请在build.gradle+(模块:+App)中(change+com.android.support:appcompat-v7:28.0.0-alpha3)或(com.android.support:appcompat-v7:28.0.0-rc02)+to+(com.android.support:appcompat-v7:28.0.0-alpha1)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2500364|接下来，单击文件->无效缓存/重新启动|2500365|需要互联网接入。|2500366|它适用于我的Windows+10和Ubuntu+18.04.1+LTS|2500367|entityMap^0|Q|1H|2A|18|3O|1A|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|V|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|W|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|M|$]]

Please (<code>change com.android.support:appcompat-v7:28.0.0-alpha3</code>) or (<code>com.android.support:appcompat-v7:28.0.0-rc02</code>) to (<code>com.android.support:appcompat-v7:28.0.0-alpha1</code>) in build.gradle (Module: App).

Next click File -> Invalidate Caches / Restart

Need internet access.

It works for me Windows 10 and in Ubuntu 18.04.1 LTS

blocks|key|34520|text|有时布局预览不只在当前项目中显示，如果在其他项目中布局预览工作正常，请尝试打开其他项目。在你当前的项目中尝试清理项目，重建项目，如果仍然不能工作，尝试在你的build.gradle应用程序文件中做一些更改，比如添加一些实现然后gradle同步，检查你的布局预览工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|34521|entityMap^0|1I|4|1N|4|35|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

Sometimes layout preview not show only in your current project, try open other project if in other project layout preview work well then the problem in your current project.
in your current project try clean project, rebuild project, if still not working try make changes in your build.gradle app file, such add some implementation then gradle sync , check your layout preview works.

blocks|key|33792|text|经过这么多翻转后，我意识到在上面的xml+Preview大小上，在Apptheme的左侧，我们有一个带耳朵的安卓图标，点击它，并更改为您的目标应用程序接口，以防它与built.gradle上的目标不同|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|33793|entityMap^0|H|3|L|7|X|8|2A|C|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

After so many flip-flap I realised that on <code>xml</code> <code>Preview</code> size above,on the left side of <code>Apptheme</code> we have Android Icon with ears click it and change to your target api in case that its not the same as it targeted on <code>built.gradle</code>

blocks|key|2710210|text|此问题是由于主题兼容性问题造成的。您所要做的就是首先导航到项目view.There中的res/values/styles.xml，查找基本应用程序主题，默认情况下应该是第四行。它看起来类似于以下内容：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2710211|<style+name="AppTheme"+parent="Theme.AppCompat.Light.DarkActionBar">|code-block|syntax|javascript|2710212|现在，您只需将'Base.+.‘添加到父级。|2710213|<style+name="AppTheme"+parent="Base.Theme.AppCompat.Light.DarkActionBar">|2710214|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

This problem occurs due to theme compatibility issue.
All you have to do is first navigate to res/values/styles.xml in the project view.There look for base application theme which by default should be the fourth line.
It'd look similar to the following:

<pre><code>&lt;style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"&gt;
</code></pre>

Now, you just have to add 'Base. to the parent.

<pre><code>&lt;style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"&gt;
</code></pre>

blocks|key|33821|text|转到style.xml文件，只需在主题前添加“基础”类。就像|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33822|<style+name="AppTheme"+parent="Base.Theme.AppCompat.Light.DarkActionBar">
</style>|code-block|syntax|javascript|33823|@注意:将Theme.AppCompat.Light.DarkActionBar替换为Base.Theme.AppCompat.Light.DarkActionBar|33824|并清除项目。|33825|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Go to style.xml file and just add "Base" class before theme. as like

<pre><code>&lt;style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar"&gt;
&lt;/style&gt;
</code></pre>

@Note: Replace Theme.AppCompat.Light.DarkActionBar to Base.Theme.AppCompat.Light.DarkActionBar

and clear project.

blocks|key|2500479|text|对我来说，这个问题在我第一次运行APK后一直出现。作废无济于事。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2500480|然而，我带来了一个变通方法：|2500481|只需运行APK，当它运行时，您可以单击"Lightning“按钮(应用更改)，将您的更改提交到右上角的"+run”按钮。在对布局进行更改时，对我来说很有吸引力。|2500482|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

For me this problem keeps appearing after I run the APK at first time. Invalidating did not help. 
However, I came with a workaround: 
Just run the APK, and while it's running you can submit your changes clicking the "Lightning" button (Apply changes) next to to the "Run" button at the top right panel. Works charming for me, when making changes to the layout.

blocks|key|33866|text|在顶部的Android+Studio菜单中，进入视图>工具窗口>预览，然后它应该会出现在Android+Studio框架中的某个地方，您可以使用预览框架中的凹轮工具将其移动到所需的位置|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|33867|entityMap^0|O|A|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

In your top Android Studio menu, go to View > Tool Windows > Preview, then it should appear somewhere in the frame of Android Studio, you can move it to the desired place with the dented wheel tool in the Preview frame

blocks|key|34679|text|对我来说，在Android+Studio3.6.1中，而在layout.xml文件中，点击这里再次显示了布局的预览。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34680|📷|atomic|offset|length|34681|​|34682|我不认为"tab“Preview已经存在了，它现在确实出现在这里:+View+>+Tool+Windows+>+Preview。|34683|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/d195abdb0b343973ae49ea2c2c79138d.png|imageAlt^0|0|0|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|U|8|@]|9|@$E|V|F|W|1|X]]|A|$]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R|S|-4]]]]

For me, in Android Studio 3.6.1, while in the layout.xml file, clicking here showed the preview of the layout again. <a href="https://i.stack.imgur.com/qrZWH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qrZWH.png" alt="Android Studio 3.6.1 Screenshot" /></a>
I Don't think the &quot;tab&quot; Preview exists anymore, it does now appear to me here: View &gt; Tool Windows &gt; Preview.

blocks|key|35767|text|Follow+a+few+steps:-
1)+Clean+Project
If+1+doesn't+work+then
2)+Invalidate+cache+and+restart+
If+2+doesn't+work+then+
3)+run+command+in+the+project+folder+rm+-r+.idea|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|35768|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>Follow a few steps:-
1) Clean Project
If 1 doesn't work then
2) Invalidate cache and restart 
If 2 doesn't work then 
3) run command in the project folder rm -r .idea
</code></pre>

blocks|key|33983|text|我使用了Debug+"app“按钮|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33984|📷|atomic|offset|length|33985|我的问题就解决了|33986|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/85aee281dbcc06f01263eba012e96e5f.png|imageAlt^0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@$E|T|F|U|1|V]]|A|$]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P|Q|-4]]]]

I used the Debug "app" button 
<img src="https://i.stack.imgur.com/h2REt.png" alt="enter image description here"> 
and my problem was solved

blocks|key|2710578|text|清除Project|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2710579|Rebuild+Project|unordered-list-item|2710580|
|2710581|Invalidate缓存/重新启动|2710582|ordered-list-item|2710583|2710584|2710585|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|Q|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|R|8|@]|9|@]|A|$]]|$1|I|3|-4|5|J|7|S|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

<ol>
<li>Clean Project</li>
<li>Rebuild Project</li>
<li>Invalidate Caches / Restart</li>
</ol>

blocks|key|34050|text|Android+Studio停留在初始化阶段|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34051|android+studio+4.1.2突然停留在初始化预览和XML预览完全崩溃。这就是我为解决这个问题所做的事情|34052|转到C:/Users/username/AppData/Roaming/Google|34053|Delete整个集成开发环境folder|unordered-list-item|34054|
|34055|Invalidate缓存，然后重新启动|34056|34057|34058|34059|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|H|7|W|8|@]|9|@]|A|$]]|$1|M|3|-4|5|H|7|X|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|Q|$]]

<h2>Android Studio Stuck At Initializing</h2>
android studio 4.1.2 suddenly stuck at initializing preview and XML preview is completely crashed. this is what I have done to fix the issue
<ul>
<li>go to C:/Users/username/AppData/Roaming/Google</li>
<li>Delete the entire AndroidStudio folder</li>
<li>Invalidate cache and restart your IDE</li>
</ul>

blocks|key|2710893|text|Android+Studio停留在初始化阶段|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2710894|2710895|关闭项目|unordered-list-item|2710896|删除项目根文件夹中的.idea文件夹|2710897|打开项目|2710898|2710899|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|N|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|L|$]]

Android Studio Stuck At Initializing
<ul>
<li>Close the project</li>
<li>Delete .idea folder in project root folder</li>
<li>Open the
project</li>
</ul>

blocks|key|34191|text|解决方案|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|34192|34193|转到Preferences+->+Plugin+->+Installed.|unordered-list-item|34194|Search+"Android+APK+Support“Restart|34195|Re-enable+Disable+It|34196|Invalidate&Restart|34197|Re-enable+"Android+APK+Support”plugin|34198|Restart|34199|Done+(它应该可以解决这个问题。如果您仍然在一些自定义视图上看到该问题，只需重新构建/运行项目即可)|34200|34201|PROBLEM|34202|问题的原因(根据我的调查)与一些不正确的UI部件有关，例如：|34203|不正确的XML布局implementation|34204|Incorrect样式implementation|34205|
+|34206|34207|34208|因此，如果问题仍然存在，只需尝试找出UI的哪一部分实现错误，并修复它。|34209|entityMap^0|0|4|0|0|0|0|0|0|0|0|0|0|0|7|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|1G|8|@]|D|@]|E|$]]|$1|J|3|K|5|I|7|1H|8|@]|D|@]|E|$]]|$1|L|3|M|5|I|7|1I|8|@]|D|@]|E|$]]|$1|N|3|O|5|I|7|1J|8|@]|D|@]|E|$]]|$1|P|3|Q|5|I|7|1K|8|@]|D|@]|E|$]]|$1|R|3|S|5|I|7|1L|8|@]|D|@]|E|$]]|$1|T|3|U|5|I|7|1M|8|@]|D|@]|E|$]]|$1|V|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|1O|8|@$9|1P|A|1Q|B|C]]|D|@]|E|$]]|$1|Y|3|Z|5|6|7|1R|8|@]|D|@]|E|$]]|$1|10|3|11|5|6|7|1S|8|@]|D|@]|E|$]]|$1|12|3|13|5|I|7|1T|8|@]|D|@]|E|$]]|$1|14|3|15|5|6|7|1U|8|@]|D|@]|E|$]]|$1|16|3|-4|5|I|7|1V|8|@]|D|@]|E|$]]|$1|17|3|-4|5|6|7|1W|8|@]|D|@]|E|$]]|$1|18|3|19|5|6|7|1X|8|@]|D|@]|E|$]]|$1|1A|3|-4|5|6|7|1Y|8|@]|D|@]|E|$]]]|1B|$]]

SOLUTION
<ul>
<li>Go to Preferences -&gt; Plugin -&gt; Installed.</li>
<li>Search &quot;Android APK Support&quot; -&gt; Disable it</li>
<li>Invalidate Caches &amp; Restart</li>
<li>Re-enable &quot;Android APK Support&quot; plugin</li>
<li>Restart</li>
<li>Done (It should resolve the issue. If you still see the issue on some custom views, just rebuilt/run the project)</li>
</ul>
PROBLEM
The reason of the issue (from my investigation) is related to some incorrect UI parts, for example:
<ul>
<li>Incorrect XML layout implementation</li>
<li>Incorrect styles implementation</li>
</ul>
So if the issue still persists, just try to figure out what part of your UI implemented wrong, and fix it.

blocks|key|36001|text|在build.gradle中使用下面的代码，它将显示您的布局预览。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|36002|+configurations.all+{
++++resolutionStrategy+{
++++++++force+'androidx.core:core-ktx:1.6.0'
++++}
}|code-block|syntax|javascript|36003|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|$]]

use the below code in build.gradle and it will show your layout preview.
<pre><code> configurations.all {
 resolutionStrategy {
 force 'androidx.core:core-ktx:1.6.0'
 }
}
</code></pre>

I'm using Android Studio 1.4

It has passed some time since the last time I've created a new project in android studio and today when I did it the android studio does not show anything from the layout preview. Its a blank window and says "Nothing to show".

I think it's related with the new support design library cuz I've never seen this new "default code". I've researched a bit and it's the new android material design guidelines ... 

I've already done this:

<ol>
<li>updated the SDK tools</li>
<li>cleaned the project and rebuild it</li>
<li>invalidated and restarted caches</li>
</ol>

...and still nothing.

Updated:

I decided to update 1.5.1 it's like this: it's giving me that rendering problem.. I think it's not showing correctly the lower right button, cuz I think it's supposed to be a button with a message icon in it and in my AS just shows the message icon (correct me if I'm wrong).

<a href="https://i.stack.imgur.com/4sAuC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4sAuC.png" alt="enter image description here"></a>

<a href="https://i.stack.imgur.com/PXpLq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PXpLq.png" alt="enter image description here"></a>

Android Studio does not show layout preview

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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我使用的是Android Studio 1.4距离我上次在android studio中创建新项目已经过去了一段时间，今天当我这样做的时候，android studio没有显示布局预览中的任何内容。这是一个空白窗口，上面写着“没有要显示的东西”。我认为这与新的支持设计库有关，因为我从未见过这个新的“默认代码”。我研究了...

问Android Studio不显示布局预览
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