blocks|key|316123|text|我不得不使用killall+adb，因为不知何故，Android+Studio设法崩溃了，不想再和亚行通信了。因此，我的设备没有出现。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|316124|因此，退出Android+Studio，终止终端中的所有adb实例，然后重新启动Android+Studio+(应该询问是否应该启用调试)成功了。|316125|entityMap^0|6|B|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|N|8|@]|D|@]|E|$]]]|I|$]]

I had to <code>killall adb</code> because somehow, Android Studio managed to crash and did not want to communicate with adb anymore. Thus, my device did not show up.

So quitting Android Studio, terminating all adb instances in Terminal and starting Android Studio again (should ask if it should enable debugging then) worked.

blocks|key|316951|text|花了一段时间后，我发现问题是将USB调试选项设为on。只需在您的移动设置->开发人员选项->USB调试中找到。只需启用它，它就能正常工作。这可能会对某些人有帮助！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316952|​|316953|📷|atomic|offset|length|316954|316955|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c62def3bb17a3d09af4d5a176bfe4d67.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

After spending some time I found the problem was to enable USB debugging option to on. Just find in your mobile Settings->Developer Option->USB debugging. Just enable it and it works.
It might help someone!

<a href="https://i.stack.imgur.com/H8jKz.png" rel="noreferrer"><img src="https://i.stack.imgur.com/H8jKz.png" alt="enter image description here"></a>

blocks|key|99347|text|我的Nexus+5手机在设置菜单中没有开发者选项。我不得不做以下事情：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99348|在Android+4.2和更新版本中，开发者选项默认是隐藏的。要使其可用，请转到Settings+>+About+phone并点击Build+number七次。返回到上一个屏幕以查找开发人员选项。|99349|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|$]]

My Nexus 5 phone did not have developer options in the settings menu. I had to do the following:

On Android 4.2 and newer, Developer options is hidden by default. To make it available, go to Settings > About phone and tap Build number seven times. Return to the previous screen to find Developer options.

blocks|key|316325|text|也可以尝试取消勾选“工具”-+"Android“-”启用ADB集成“。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316326|这是我在更新Windows到10后的工作。|316327|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|$]]

Also try uncheck "Tools" - "Android" - "Enable ADB Integration".

This is work for me after update Windows to 10.

blocks|key|316710|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316711|📷|atomic|offset|length|316712|316713|316714|316715|316716|打开调试模式后，打开设置/开发人员选项更新配置相同的映像|316717|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2734d57f2eba846aae798098ba5e6b34.jpeg|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/ec3224d5621665484cbbebeca5f94c2b.jpeg^0|0|0|1|0|0|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Y|8|@]|9|@$E|Z|F|10|1|11]]|A|$]]|$1|G|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|H|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|I|3|C|5|D|7|14|8|@]|9|@$E|15|F|16|1|17]]|A|$]]|$1|J|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|19|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T|U|-4]]|V|$5|P|Q|R|A|$S|W|U|-4]]]]

<a href="https://i.stack.imgur.com/tQU73.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/tQU73.jpg" alt="Please check debug mode in device"></a>

<a href="https://i.stack.imgur.com/nCfXo.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/nCfXo.jpg" alt="Config same image"></a>

After u turn on debug mode open settings/Developer options
Update config same image

blocks|key|99266|text|AVD管理器用于模拟器映像。它从不显示硬件。这对于AVD管理器的任何使用都是正确的:+Eclipse、Android+Studio等。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99267|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|$]]

The AVD Manager is for emulator images. It never shows hardware. This is true for any usage of the AVD Manager: Eclipse, Android Studio, etc.

blocks|key|317179|text|尝试更改到midi设备的usb连接模式。这就是对我有效的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317180|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 changing mode of usb connection to midi devices. Thats what worked for me.

blocks|key|100762|text|在我的例子中，我必须将我的安卓设置为enable+USB+debugging。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|100763|​|100764|📷|atomic|100765|100766|https://developer.android.com/studio/run/device#setting-up|100767|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/a8b9bf4aa0a08eb1d708e9a0d0f600c1.png|imageAlt|1|LINK|MUTABLE|url^0|I|K|0|0|0|1|0|0|0|0|1M|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|14|8|@]|D|@$9|15|A|16|1|17]]|E|$]]|$1|K|3|G|5|6|7|18|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|19|8|@]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|N|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]|W|$5|X|R|Y|E|$Z|M]]]]

In my case, I had to set up my android to <code>enable USB debugging</code>.
<a href="https://i.stack.imgur.com/uWoBe.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/uWoBe.png" alt="enter image description here" /></a>
<a href="https://developer.android.com/studio/run/device#setting-up" rel="nofollow noreferrer">https://developer.android.com/studio/run/device#setting-up</a>

blocks|key|99551|text|我知道这听起来很疯狂，但是我在连接的时候重启了我的手机，它出现了|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99552|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 know it sounds crazy but i just reboot my phone while was connected and it appears

blocks|key|317590|text|打开USB调试并将设备连接到PC。等待设备被PC检测到。连接后，关闭USB调试，然后再次打开它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317591|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|$]]

Turn on USB debugging and connect the device to PC. Wait until the device gets detected by PC. While connected, turn off USB debugging and turn on it again.

blocks|key|316408|text|我一直在解决同样的问题。我已经在我上面的帖子中尝试了这个主题中的所有技巧。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316409|我的情况是：-计算机已看到我的平板电脑-在开发人员模式下打开了调试usb选项-+sdk中的adb没有看到我的设备，终止并启动没有帮助|316410|问题是我的win8上有三星Galaxy驱动程序。当我打开设备管理器时，看到的是带有黄色标记的联想A7600平板电脑。Settings+->+->从现有的驱动程序中选择，我将三星的驱动程序连接到这个驱动程序。|316411|它的效果就像魅力一样。|316412|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 have been troubleshotting same problem. 
I have tried all the tips in this topic in posts above me.

My situation was:
- computer have seen my tablet
- had debug usb options in developer mode on
- adb in sdk was not seeing my device, killing &amp; start didnt help

The problem was I had Samsung Galaxy drivers on my win8. When I went to devices manager, there was Lenovo A7600 Tablet with yellow marking. Settings -> actualize drivers -> choose from existing ones and i hooked up the Samsung drivers to this one.

It worked like charm.

blocks|key|317089|text|如果对每种配置都进行了排序，那么对我来说起作用的就是将设备切换到PTP，然后再连接回MTP。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|317090|entityMap^0|W|3|16|3|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

If every configuration is sorted, what worked for me was to switch the device to be connected at <code>PTP</code> and then back to <code>MTP</code>.

blocks|key|317116|text|解决方案是切换到PTP+USP选项，而不是MTP。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317117|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|$]]

Switching to PTP USP Option instead of MTP is the solution.

blocks|key|317155|text|在我更新SDK+platform-+this之前，以上所有答案都没有解决我的问题。这可能是导致这个问题的原因之一。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317156|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|$]]

None of above answers solved my problem until I updated SDK platform-tools.This maybe one of the causes of this issue.

blocks|key|317287|text|我使用的是Nougat+API+24的Android版本，我通过更换USB数据线解决了一个无法检测到的设备问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317288|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 use the Android version of Nougat API 24, I solved a device problem not detected by replacing the USB cable.

blocks|key|99295|text|检查设备驱动程序如果您的设备是Galaxy安装Kise将搜索您的驱动程序|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99296|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|$]]

Check device driver
if your device is Galaxy install Kise will search your driver

blocks|key|99460|text|令人惊讶的是，在Debian+Linux上对我起作用的只有：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99461|adb+kill-server|code-block|syntax|javascript|99462|而不用重新启动它！|99463|我一关掉服务器，这个设备就出现在Android+Studio中。我发现这一点的唯一原因是我的终端模拟器窗口是透明的。:D|99464|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|$]]

Surprisingly enough, what worked for me on Debian Linux was ONLY:

<pre><code>adb kill-server
</code></pre>

WITHOUT STARTING IT AGAIN!!!

The device appeared in the Android Studio as soon as I killed the server. The only reason I spotted this was that my terminal emulator window was transparent. :D

blocks|key|316525|text|对于三星的盖乐世s4，我通过安装Kies软件解决了这个问题，之后，一切都像符咒一样工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316526|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|$]]

For Samsung Galaxy s4 i resolved issue by instaling Kies software, after that everything works like a charm.

blocks|key|316801|text|我也面临着同样的问题。原来是有问题的数据线。该设备将开始充电，但不会显示在Android+Studio的联网设备中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316802|尝试另一条电缆工作正常。|316803|如果您已使用当前电缆一段时间，请先尝试另一条电缆。|316804|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|$]]

I was facing the same issue. Turned out to be a faulty data cable. The device would start charging but would not show up in connected devices in Android Studio.

Trying another cable worked fine.

Try another cable first if you have been using your current one for a while.

blocks|key|99914|text|这个想法是修复您的计算机上的USB驱动程序。启动->设备管理器->其他设备。右键单击USB设备，然后更新驱动程序软件->浏览我的电脑..->让我选择...下一步是->安卓设备->。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99915|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|$]]

The idea is to fix USB driver on your computer.
Start -> Device Manger -> Other devices.
Right click on the USB device then Update Driver Software -> Browse my Computer ..-> Let me pick... -> Android device -> Next.

blocks|key|100200|text|所以我用的是Android+Studio+3.1，上面的东西都不起作用。修复这个问题的唯一方法是启用"Use+libusb+backend“的复选框(请参阅附件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100201|📷|atomic|offset|length|100202|​|100203|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/5684e545471d1577d35f3de8cbca79b6.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]]]]

So I am using Android Studio 3.1 and nothing above worked. The only thing that fixed the problem is enabling the checkbox of "Use libusb backend" See attached <a href="https://i.stack.imgur.com/tjt0t.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tjt0t.png" alt="enter image description here"></a>

blocks|key|317424|text|特别是如果您以前有连接，如果您正在使用使用ADB连接到您的手机的其他应用程序-关闭该应用程序。我有总指挥官，有亚行的手机连接插件，这解决了我的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317425|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|$]]

Especially if you had a connection previously, if you are using some other application that used ADB connection to your phone - close that application. I have Total Commander that has plugin for ADB connection to mobile phone, and that solved my problem.

blocks|key|99378|text|Android+Studio也没有在Windows上显示我的设备(三星Galaxy+Alpha)，直到我从三星支持页面下载并安装了Windows驱动程序。我不得不在设备上使用MTP连接模式。在我第一次将设备连接到计算机后，我还确认了对计算机的授权。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99379|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|$]]

Android Studio did not show my device (Samsung Galaxy Alpha) on Windows too until I downloaded and installed a Windows driver from Samsung Support page. I had to use the MTP connection mode on the device. I also confirmed authorizing the computer after I connected the device to it for the first time.

blocks|key|99418|text|我也有这个问题。在查看我的边缘6之后，启用usb调试显示为灰色，并且无法打开。谷歌快速搜索显示，是myKnox安全程序阻止了它的使用。你所需要做的就是卸载myKnox，然后你就可以进行调试了。这解决了我的问题，选择设备对话框现在显示我的连接电话。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99419|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 also had this problem.
After looking though my edge 6 the enable usb debugging was greyed out and unable to be turned on.
Quick google search showed it was the myKnox security program that was stopping this from being used. all you need to do is uninstall myKnox and you can then allow usb debugging. This solved my problem with the choose device dialog now showing my connected phone.

blocks|key|316447|text|不确定此问题是否仍未解决。但我通过换成不同的usb数据线解决了这个问题。希望这能为你节省几个小时。LOL|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316448|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|$]]

not sure if this question is still open. But I solved the issue by switching to a different usb cable. hopefully, this can save you a couple hours. lol

blocks|key|99882|text|如果您的Windows甚至无法安装驱动程序，您应该转到设备管理器并获取设备ID+(右键单击您的设备->属性->详细信息->硬件ID(在属性中))。从Android+Studio安装Google+USB驱动程序。进入android_winusb.inf文件(在ANDROID_SDK_DIR/extras/google/usb_driver/下)，根据文件格式添加您的设备ID。再次运行"adb+devices“，一切正常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|99883|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 your Windows cannot even install the driver, you should go to Device Manager and get the Device ID (right click on your device->Properties->Details->Hardware Ids (in Property).
Install the Google USB drivers from Android Studio.
Go to android_winusb.inf file (under ANDROID_SDK_DIR/extras/google/usb_driver/) and add your Device ID according to the file format.
Run "adb devices" again and everything works fine.

blocks|key|316979|text|请看http://visualgdb.com/KB/usbdebug-manual/，因为这对我很有效。我必须在Android+studio中下载并安装USB驱动程序，然后通过windows8.1中的设备管理器实际安装驱动程序。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|316980|entityMap|0|LINK|mutability|MUTABLE|url|http://visualgdb.com/KB/usbdebug-manual/^0|2|14|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]]]]

Please see <a href="http://visualgdb.com/KB/usbdebug-manual/" rel="nofollow noreferrer">http://visualgdb.com/KB/usbdebug-manual/</a> as this worked well for me. Had to download and install the USB drivers inside Android studio then actually install the drivers via device manager in windows 8.1

blocks|key|317008|text|我相信这可能会对外面的某个人有用。在我的例子中，我在mac上运行Android+Studio，同时也在尝试Visual+Studio+Xamarin。同时打开这两个文件就会造成这种冲突。所以关闭Visual就足够了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317009|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'm sure this might be useful for someone out there. 
In my case I am running Android Studio in a mac and also trying Visual Studio Xamarin. Having both of them opened at the same time was creating this conflict. So closing Visual was enough.

blocks|key|100028|text|已经有很多答案了，但我刚刚下载了一个运行O的模拟器，在那之后就再也没有设备工作了。我从AVD管理器中删除了模拟器，杀死了adb，然后重启了Android+studio。已将USB移至另一个端口，设备再次出现在那里。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100029|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|$]]

Many answers already but I had just downloaded a simulator running O, and after that no device ever worked again. I deleted the emulator from AVD manager killed adb and then restarted Android studio. Moved the USB to another port and the device was there again.

blocks|key|100223|text|在我的例子中，解决方案是关闭以重启Android+Studio|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100224|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 case the solution was to close to restart Android Studio

blocks|key|317271|text|在我的例子中，创建了多个adb实例。从系统拔下设备。打开任务监视器(活动监视器)并检查adb实例。杀死所有adb进程。再次尝试连接设备。也许能行得通。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317272|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 case There was multiple instance of adb got created. Unplug device from system.
Open Task Monitor (Activity Monitor) and check for adb instances. Kill all adb processes. Try to connect device again. It might work.

blocks|key|100310|text|环境-+AS+3.3.2+Linux+4+(ubuntu)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100311|in+AS+used+menu+Tools+>+Create+desktop+entry+|code-block|syntax|javascript|100312|桌面文件内容-(请注意，路径不包括平台工具)|100313|[Desktop+Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Name=Android+Studio
Icon=jetbrains-studio.png
Path=/home/rob/android-studio
Exec=sh+-c+'+/home/rob/android-studio/bin/studio.sh'+
StartupNotify=false
StartupWMClass=jetbrains-studio
OnlyShowIn=Unity;
X-UnityGenerated=true|100314|请注意，上面的desktop.PATH将找不到下面的adb.SDK.platform+tools+'adb‘的位置：|100315|+$+which+adb
/usr/local/src/android-sdk-linux/platform-tools/adb|100316|在我的设置中，我的症状是任何终端都会列出设备OK，但AS中的工具栏按钮永远不会显示连接的设备……当我的手机通过USB线连接时，我只能看到“没有设备”。|100317|我的解决方案是在文件顶部附近添加正确的路径：|100318|+${AS_HOME}/bin/studio.sh+...

PATH=$PATH:/usr/local/src/android-sdk-linux/platform-tools:/usr/local/src/android-sdk-linux/tools|100319|entityMap^0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|13|8|@]|9|@]|A|$]]|$1|S|3|T|5|D|7|14|8|@]|9|@]|A|$E|F]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

Env - AS 3.3.2 
 Linux 4 (ubuntu)

<pre><code>in AS used menu Tools &gt; Create desktop entry 
</code></pre>

Desktop file content - ( note the path does NOT include Platform-tools )

<pre><code>[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Name=Android Studio
Icon=jetbrains-studio.png
Path=/home/rob/android-studio
Exec=sh -c ' /home/rob/android-studio/bin/studio.sh' 
StartupNotify=false
StartupWMClass=jetbrains-studio
OnlyShowIn=Unity;
X-UnityGenerated=true
</code></pre>

Note that the location of SDK.platform-tools 'adb' below will not be found by desktop.PATH above:

<pre><code> $ which adb
/usr/local/src/android-sdk-linux/platform-tools/adb
</code></pre>

On my setup, my symptom was that any terminal would list the device OK but the toolbar button in AS would never show a connected device... "no devices" is all i would ever see when my phone was connected via USB cable. 

SOLUTION for me was adding the correct PATH near the top of the file:

<pre><code> ${AS_HOME}/bin/studio.sh ...

PATH=$PATH:/usr/local/src/android-sdk-linux/platform-tools:/usr/local/src/android-sdk-linux/tools
</code></pre>

blocks|key|317383|text|在Windows7上，唯一对我起作用的就是这个。进入设备管理器->下的安卓手机->右击并选择‘启用’|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317384|​|317385|📷|atomic|offset|length|317386|317387|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/422b5ffd8bc546952d05fbb502ceb414.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

On Windows 7 , the only thing that worked for me is this.
Go to Device Manager -> Under Android Phone -> Right Click and select 'enable'

<a href="https://i.stack.imgur.com/XB33K.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XB33K.png" alt="enter image description here"></a>

blocks|key|317513|text|我的macbook+pro上有usb转usbc集线器，但不知何故阻塞了设备，当我直接将它与苹果usbc连接到usb加密狗时，它就能工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317514|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 usb to usbc hub on my macbook pro which was blocking the device somehow, it worked when I connected it directly with the apple usbc to usb dongle.

blocks|key|317638|text|我的工作是取消选中您的移动设置开发者选项下的usb调试模式，并再次允许它将显示我的设备选项|type|unstyled|depth|inlineStyleRanges|entityRanges|data|317639|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|$]]

Thing which worked for me is is to uncheck the usb debug mode under your mobile setting 
developer option and allow again it will
show the my device option

blocks|key|100652|text|尝试以下命令并重新连接您的设备，它将显示。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100653|​|100654|adb+kill-server|code-block|syntax|javascript|100655|100656|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|N|8|@]|9|@]|A|$G|H]]|$1|I|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

try the following command and reconnect your device, it will show up.
<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-html lang-html prettyprint-override"><code>adb kill-server</code></pre>
</div>
</div>

blocks|key|100788|text|对我来说，Macbook+USB+C+Hub才是问题所在。我将手机直接连接到Mac+USB+C端口，工作起来很有魅力！希望这对你有所帮助！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|100789|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|$]]

For me, Macbook USB C Hub was the issue. I connected the phone directly to Mac USB C port and worked like charm! hope this help!

blocks|key|316379|text|我在windows8中也遇到过同样的问题，并找到了解决方案。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|316380|1)右击我的电脑。|316381|2)点击manager。|316382|3)转到设备管理器。|316383|4)右击设备名称(在其他设备上)。|316384|5)点击Update+Driver。|316385|6)点击下一步。|316386|7)点击让我知道...标签。|316387|驱动程序将自动安装。|316388|它对我来说很好。|316389|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|X|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|11|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|12|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|13|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|14|8|@]|9|@]|A|$]]|$1|T|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|U|$]]

I have faced same problem in windows 8 and found the solution.

1) Right click on My Computer. 
2) Click on manager. 
3) Go to Device Manager. 
4) Right click on device name (Which below on Other devices). 
5) Click on Update Driver. 
6) Click on next. 
7) Click on Let me know... label.

Driver will be installed automatically.

Its works fine for me.

The AVD Manager in Android Studio doesn't show my device but <code>adb devices</code> does show it. Am I missing something obvious here?

Android Studio doesn't see device

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Android Studio中的AVD管理器没有显示我的设备，但adb devices显示了它。我是不是漏掉了什么明显的东西？

问Android Studio看不到设备
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