blocks|key|1872423|text|首先删除您现有的仿真器，然后重新创建它。现在再运行一次，希望它能修复你的错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872424|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|$]]

First delete your exiting emulator than recreate it. Now run again hope it will fix your error.

blocks|key|1872456|text|如果你的docker正在运行，你应该关闭它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872457|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|$]]

if you docker is running you should close it.

blocks|key|1872505|text|重新启动电脑为我解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872506|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|$]]

Restarting the computer solved it for me.

blocks|key|1872517|text|经过多次尝试，停止设备从AVD(确切地从AVD，而不是通过交叉按钮或模拟器上的电源关闭按钮)并再次开始构建对我有帮助。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872518|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|$]]

After lots of attempts, stopping device from AVD(exactly from AVD, not by cross button nor power off button on emulator) and starting build again helped me.

blocks|key|2086443|text|升级您的显示器驱动程序...这对我很有效！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086444|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|$]]

Upgrade your Display driver ... this worked for me!

blocks|key|2086468|text|可能您没有模拟器的SDK，请查看File->Settings->Appearance&Behavior->SystemSetting->Android+SDK|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086469|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|$]]

maybe you do not have SDK of your simulator,please check File->Settings->Appearance&amp;Behavior->SystemSetting->Android SDK

blocks|key|2086516|text|尝试配置不同的Android+Emulator并在运行时使用它。您当前的仿真器可能有一些问题。这对我很管用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086517|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|$]]

Try configuring different Android Emulator and using it while running. You current emulator may have some issues. It worked for me.

blocks|key|1872599|text|在更新我的android工作室时，我也遇到了类似的问题。不知何故，它改变了我的SDK路径。我只需将其更改为更新后的SDK路径，它就起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872600|Android+Studio+->文件->设置->外观和行为->系统设置->+Android+SDK|1872601|在这里你会找到Android+SDK的位置，只需点击前面的编辑链接，然后从文件浏览器中浏览并选择Android+SDK即可。选择并单击Apply。|1872602|选择AVD管理器并启动Emulator。这个解决方案对我很有效。|1872603|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I had a similar problem when updated my android studio. Somehow it changed my SDK path. I just changed it to my updated SDK path and it worked.

Android Studio -> File -> Settings -> Appearance &amp; Behaviour -> System Settings -> Android SDK 

Here you will find Android SDK location just click on edit link in front of that and browse and select the Android SDK from the file browser. Select and click on Apply.

Select AVD manager and start Emulator. This solution worked for me.

blocks|key|2086537|text|我不得不关闭Parallels+Desktop，它在没有重启的情况下重新开始工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086538|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|$]]

I had to turn off Parallels Desktop and it started working again without reboot.

blocks|key|1872630|text|对我来说，发生的事情是虚拟设备从未启动过。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872631|解决这个问题的方法是：|1872632|cd+~/.android/avd/<Name+of+virtual+device>/
rm+*.img|code-block|syntax|javascript|1872633|然后我重启了虚拟设备，它就上线了。|1872634|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For me what was happening was the Virtual device never booted. 

What fixed this was: 

<pre><code>cd ~/.android/avd/&lt;Name of virtual device&gt;/
rm *.img
</code></pre>

Then I restarted the virtual device and it came on line.

blocks|key|1872641|text|如果前面的答案都不能解决您的问题，我建议您检查KVM错误。即使您没有安装KVM，当您尝试运行x86镜像时也可能得到KVM错误。打开终端，在启动模拟器后输入dmesg+%7C+grep+kvm。这样，您将能够看到是否出现KVM错误。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1872642|在我安装了Android+Studio2.3.3的Ubuntu16.04机器上，问题出在KVM上。Android+Studio试图为x86镜像启用KVM。当我尝试启动模拟器时，dmesg显示错误"kvm:启用虚拟化失败“。尽管手臂图像工作正常。|1872643|安装KVM之后，我可以在模拟器上运行x86镜像，而不会出现错误。|1872644|如果这就是您遇到的问题，您可能需要检查KVM+installation+page。|1872645|entityMap|0|LINK|mutability|MUTABLE|url|https://help.ubuntu.com/community/KVM/Installation^0|25|G|0|2G|5|0|0|J|L|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|Z|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|L|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]]]

If none of the previous answers solved your problem, I suggest you to check KVM errors. Even if you did not install KVM it's possible you to get KVM errors when you try to run x86 images. Open a terminal and type <code>dmesg | grep kvm</code> after starting emulator. This way you will be able to see if you get KVM errors.

On my Ubuntu 16.04 machine with Android Studio 2.3.3 installed on it, the problem was about KVM. Android Studio was trying to enable KVM for x86 images. When I try to start the emulator, <code>dmesg</code> showing errors "kvm: enabling virtualization failed." Although ARM images were working fine.

After installing KVM, I was able to run x86 images on emulator without errors.

If this is the problem you are encountering, you might want to checkout <a href="https://help.ubuntu.com/community/KVM/Installation" rel="nofollow noreferrer">KVM installation page</a>.

blocks|key|2086554|text|我尝试在设备中执行“立即冷启动”，但收到错误提示:+AVD+Pixel_API_24已在运行。如果不是这样，请删除/.android/avd/Pixel_API_24.avd/*.lock上的文件。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2086555|删除建议文件夹中的.lock文件后，“立即冷启动”起作用，设备恢复正常。|2086556|entityMap^0|1L|11|0|9|5|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

I tried doing a “Cold Boot Now” in the device, but got an error saying: AVD Pixel_API_24 is already running. If that is not the case, delete the files at <code>/.android/avd/Pixel_API_24.avd/*.lock</code>. 

After deleting a <code>.lock</code> file in the suggested folder the “Cold Boot Now” worked and the device was back to normal.

blocks|key|2086598|text|我遇到了同样的问题，模拟器将启动，但我会留下一个黑屏，我的应用程序将无法加载。无论如何，我所做的是，我访问了模拟器的设置。确保"Save+Make+boot+state+on+exit+for+AVD+Pixel_2_API_26“设置为"No”。注意:我的设备是Pixel+2，对于其他用户可能会有所不同。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086599|📷|atomic|offset|length|2086600|​|2086601|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/cff19f59ab9f87180aafa64668953acd.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 was experiencing the same issue where the emulator would start up but I would be left with a black screen and my app won't load up.
Anyway, what I did was, I accessed the setting of the emulator. Make sure the "Save quick-boot state on exit for AVD Pixel_2_API_26" is set to "No". Note: My device is a Pixel 2, it could be different for other users.
 <a href="https://i.stack.imgur.com/5U0Bk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5U0Bk.png" alt="Extended Controls"></a>

blocks|key|1872710|text|我对Quick+boot的新更新也有同样的问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1872711|不幸的是，为了让模拟器再次工作，我不得不禁用它。|1872712|Android+Studio+->+tools+->+Android+->+AVD+->+->编辑您的模拟器->显示高级设置->选择冷启动|1872713|entityMap^0|2|A|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|P|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|K|$]]

I have the same issue with the new update about <code>Quick boot</code>.

Unfortunately I had to disable it to make the emulator working again.

Android Studio -> tools -> Android -> AVD Manager -> edit your emulator -> Show Advanced Settings -> select Cold boot

blocks|key|2086640|text|我通过修改我在AVD上的配置解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086641|1)转到AVD管理器|2086642|2)点击“编辑此AVD”按钮(铅笔图标)。|2086643|我没有选择任何设备，它显示了一条错误消息，提示我需要选择一个设备才能使AVD正常工作。一旦我这样做了，并保存我的模拟器工作。|2086644|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

I solved by modifying my configuration on AVD.

1) Go to the AVD Manager

2) Click "Edit this AVD" Button (the pencil icon).

I had no device selected and it showed an error message that I need to select a device for the AVD to work. Once I did that and saved my emulator worked.

blocks|key|1872733|text|我有另一个Android模拟器在后台运行，完全独立于Android+Studio。我在加载ADB时在列表中看到了它，因此出于某种原因它被检测到了，但我忽略了它。无论如何，当我关闭它的时候，这个错误就消失了，我可以毫无问题地加载我的应用程序了。具体地说，我加载了BlueStacks。因此，如果你使用BlueStacks或其他安卓模拟器，关闭它，因为这可能是问题所在。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872734|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|$]]

I had another Android emulator running in the background, completely separate from Android Studio. I saw it in the list when I loaded ADB, so it was detected for some reason, but I ignored it. Anyway, when I closed it, this error went away and I was able to load my app no problem. Specifically, I had BlueStacks loaded. So, if you use BlueStacks or another Android emulator, close that as that might be the problem.

blocks|key|1872796|text|尝尝这个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872797|单击应用程序-->编辑配置|1872798|📷|atomic|offset|length|1872799|​|1872800|选择“指定活动”。|1872801|1872802|1872803|1872804|然后在activity中，选择您的主活动(或您为其指定的任何名称)，然后单击Ok。|1872805|1872806|1872807|然后在“目标”中选择“打开选择部署目标对话框”。|1872808|1872809|1872810|单击“应用”，然后单击“确定”。|1872811|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/3657af5768e1ceece530a01494cbf125.jpeg|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/146261260e02c788170d0a67fa26b941.jpeg|2|https://ask.qcloudimg.com/http-save/yehe-900000/d7612c90b0bda56838a74c845059949d.jpeg|3|https://ask.qcloudimg.com/http-save/yehe-900000/f15845888d50ec110248b5e57137ebde.jpeg^0|0|0|0|1|0|0|0|0|0|0|1|1|0|0|0|0|1|2|0|0|0|0|1|3|0|0|0^^$0|@$1|2|3|4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1F|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|1G|8|@]|9|@$G|1H|H|1I|1|1J]]|A|$]]|$1|I|3|J|5|6|7|1K|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1L|8|@]|9|@]|A|$]]|$1|M|3|J|5|6|7|1M|8|@]|9|@]|A|$]]|$1|N|3|E|5|F|7|1N|8|@]|9|@$G|1O|H|1P|1|1Q]]|A|$]]|$1|O|3|J|5|6|7|1R|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1S|8|@]|9|@]|A|$]]|$1|R|3|E|5|F|7|1T|8|@]|9|@$G|1U|H|1V|1|1W]]|A|$]]|$1|S|3|J|5|6|7|1X|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|V|3|E|5|F|7|1Z|8|@]|9|@$G|20|H|21|1|22]]|A|$]]|$1|W|3|J|5|6|7|23|8|@]|9|@]|A|$]]|$1|X|3|Y|5|6|7|24|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|16|17|-4]]|18|$5|12|13|14|A|$15|19|17|-4]]|1A|$5|12|13|14|A|$15|1B|17|-4]]|1C|$5|12|13|14|A|$15|1D|17|-4]]]]

Try this.

Click on App-->Edit configuration
<a href="https://i.stack.imgur.com/kjB1n.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kjB1n.jpg" alt="enter image description here"></a>

choose "Specified activity".

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

Then in activity, choose your main activity(or whatever name you gave it), then click Ok.
<a href="https://i.stack.imgur.com/sWocp.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sWocp.jpg" alt="enter image description here"></a>

Then in "target" choose "open select deployment target dialog".
<a href="https://i.stack.imgur.com/2EK6n.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2EK6n.jpg" alt="enter image description here"></a>

Click "Apply" then "Ok".

blocks|key|2086768|text|我意识到我的模拟器实际上是冻结的，尽管我重新启动了它并重新启动了我的计算机。我只需要擦除数据(AVD管理器>右键单击模拟器>擦除数据)，它又开始工作了。您将丢失所有状态，但至少您不需要重新安装它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086769|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|$]]

I realized my emulator was actually frozen, despite restarting it and restarting my computer. I just had to wipe data (AVD Manager > right-click on emulator > Wipe Data) and it started working again. You'll lose any state you had, but at least you won't have to reinstall it.

blocks|key|1872932|text|我不能得到任何解决方案，我尝试了几乎所有的解决方案。真正对我起作用的是我偶然发现的一些东西。我打开了两个Android+Studio应用程序，运行了一个，让它停留在“等待目标设备上线”，然后转到我想要运行的其他应用程序，但当你选择avd时，连接的设备下会有一个选项，选择那个。它将连接到您在运行和工作的第一个应用程序中使用的avd。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1872933|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|$]]

I couldn't get any solutions working and I tried almost every solution. What actually worked for me was something I accidentally stumbled upon. I opened two Android Studio applications and ran one and let it stay "waiting for target device to come online" and went to my other app that I want to run and run that but there will be an option under connected devices when you go to choose your avd, choose that one. It will connect to the avd you are using in the first app you ran and work.

blocks|key|2086864|text|对于现在有问题的任何人来说，没有一个解决方案有效。试试这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2086865|我也有同样的问题，它实际上是由android+Q预览版引起的。我用Pie创建了一个设备，一切都正常工作。|2086866|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|$]]

For anyone who is having the issue now and non of the solutions worked. Try this:

I was having the same issue and it was actually caused by android Q preview. I created a device with Pie and everything just works.

Recently upgraded to Android Studio from 2.2.3 to 2., running on Win10

Emulator stopped working since then. Tried installing other images(25 rev 4)/upgrading for AVD but nothing seems to work. After running gradle and showing "waiting for target device to come online" in task bar nothing happens and program doesn't run.

Kindly help

<hr>

Adding Screenshot:

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

And:

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

"waiting for target device to come online" in Android Studio 2.3

Android Studio

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最近将Android Studio从2.2.3升级到2.，运行在Win10上仿真器从此停止工作。尝试安装其他镜像(25版本4)/upgrading的AVD，但似乎没有任何工作。在运行gradle并在任务栏中显示“等待目标设备上线”后，什么也没有发生，程序不运行。热心的帮助添加截图：​​和：​​

问Android Studio 2.3中的“等待目标设备上线”
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