blocks|key|2662577|text|使你的Studio缓存无效，重新启动你的设备，pc就会正常工作。有时端口也有问题，只需在更改pc的usb端口后再尝试。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2662578|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|$]]

Invalidate your Studio cache, restart your device and pc will work. Sometimes the problem with port also, just try after changing the usb port of your pc also.

blocks|key|2662861|text|重新启用USB调试解决了此问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2662862|设置>开发人员选项>禁用并重新启用USB调试|offset|length|style|BOLD|2662863|entityMap^0|0|0|2|3|6|H|5|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|I|$]]

Re-enabling USB Debugging fixed the problem

Settings > Developer Options > Disable &amp; Re-enable USB Debugging

blocks|key|2873711|text|您只需重启ADB，无需重启PC或Phone|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2873712|请尝试以下步骤：|2873713|在命令提示符下进入Android+SDK+platform-tools目录|2873714|adb+kill-server类型|CODE|2873715|然后键入adb+start-server|2873716|现在尝试重新连接...|2873717|​|2873718|📷|atomic|2873719|2873720|在我的例子中，我通过wifi进行了很长一段时间的调试，然后ADB服务器需要刷新才能再次看到连接的设备。|2873721|2873722|它发生在运行Android8.1.0和Android+Studio3.0的像素设备上|blockquote|2873723|2873724|2873725|干杯!|2873726|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/678bd2b6eb76354f6e3f6e82acc3f06e.png|imageAlt^0|5|3|D|2|G|5|0|0|9|B|0|0|F|0|4|G|0|0|0|0|1|0|0|0|O|R|0|0|0|16|0|0|0|0|3|0^^$0|@$1|2|3|4|5|6|7|1F|8|@$9|1G|A|1H|B|C]|$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1M|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1N|8|@$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1Q|8|@$9|1R|A|1S|B|L]]|D|@]|E|$]]|$1|M|3|N|5|6|7|1T|8|@$9|1U|A|1V|B|L]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1W|8|@]|D|@]|E|$]]|$1|Q|3|R|5|6|7|1X|8|@]|D|@]|E|$]]|$1|S|3|T|5|U|7|1Y|8|@]|D|@$9|1Z|A|20|1|21]]|E|$]]|$1|V|3|R|5|6|7|22|8|@]|D|@]|E|$]]|$1|W|3|X|5|6|7|23|8|@$9|24|A|25|B|C]]|D|@]|E|$]]|$1|Y|3|-4|5|6|7|26|8|@]|D|@]|E|$]]|$1|Z|3|10|5|11|7|27|8|@$9|28|A|29|B|C]]|D|@]|E|$]]|$1|12|3|-4|5|6|7|2A|8|@]|D|@]|E|$]]|$1|13|3|-4|5|6|7|2B|8|@]|D|@]|E|$]]|$1|14|3|15|5|6|7|2C|8|@$9|2D|A|2E|B|C]]|D|@]|E|$]]|$1|16|3|-4|5|6|7|2F|8|@]|D|@]|E|$]]]|17|$18|$5|19|1A|1B|E|$1C|1D|1E|-4]]]]

You just need to restart ADB , no need to restart your PC or Phone
Try the below steps:
Go to the Android SDK platform-tools directory in the command prompt
Type <code>adb kill-server</code> 
Then type <code>adb start-server</code>
Now try re-connecting ...
<a href="https://i.stack.imgur.com/dzf9o.png" rel="noreferrer"><img src="https://i.stack.imgur.com/dzf9o.png" alt="It Worked!" /></a>
In my case I was debugging over wifi for a long time , then the ADB server needed to be refreshed to see the connected devices again
<blockquote>
It Happened on Pixel device running Android 8.1.0 with Android Studio 3.0
</blockquote>
Cheers!

blocks|key|2662896|text|尝试禁用并重新启用*+USB调试。*|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2662897|在你的开发者选项菜单下|2662898|这解决了我的问题。|2662899|entityMap^0|0|I|0|0|0|9|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|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|K|$]]

Try Disabling and Re-Enabling * USB debugging. *

Under your developer option menu

This solved my issue.

blocks|key|2662786|text|我有“撤销USB调试授权”下的“开发人员选项”，它的工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2662787|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 have "revoked USB debugging authorizations " under "Developer options" and it works

blocks|key|115878|text|我在手机的开发者选项中更改了设置，它开始工作得很好。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|115879|1.允许从未知来源安装应用程序2.允许通过USB安装应用程序。|115880|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|$]]

I changed settings in the Developer options in my phone and it started working just fine.

1.Permission to install apps from unknown source
2.permission to install apps via USB.

blocks|key|116163|text|我也有同样的问题，刚刚重启并修复了，实际上是连接问题，所以先检查手机的线缆|type|unstyled|depth|inlineStyleRanges|entityRanges|data|116164|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|$]]

Had Same Problem, Just rebooted and its fixed, its the connection problem actually, so check phone's cable first

blocks|key|2662584|text|在我的例子中，我激活了手机中的未知源，以便安装应用程序。因为这个应用还没有被Google接受，所以它将阻止安装过程。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2662585|要激活未知源(在我的设备Samsung+Galaxy+Tab+A+9.7中)：|2662586|Lock+screen+and+security|code-block|syntax|javascript|2662587|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In my case, I have activated Unknown sources in my cellphone to let application installation. Because the app hasn't accepted by Google yet, so it will block installation process.

To activate Unknown sources (In my device Samsung Galaxy Tab A 9.7 is): 

<pre><code>Lock screen and security
</code></pre>

blocks|key|113690|text|拔下您的设备并单击run，在访问选择窗口后，再次插入您的设备并选择已连接的设备。看起来不错!|type|unstyled|depth|inlineStyleRanges|entityRanges|data|113691|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|$]]

unplug your device and click on run and after visiting selection window, plug your device again and select your connected device. it will work!

blocks|key|113729|text|我已经将它从Charge+Device改为File+Transfer，它每次都能工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|113730|entityMap^0|C|7|L|D|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|$]]

I have changed it from Charge The Device to File Transfer and it works every time.

blocks|key|2873927|text|也有同样的问题。解决后重启我的AS和我的设备，不要忘了检查您的Caple。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2873928|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|$]]

Had the Same Problem .. Solved after restart My AS and My Device, Don't forget to check your Caple.

blocks|key|2662952|text|我解决了mac+Android>Preferences>Build，Execution，Deployment>Debugger+-取消选中=>+Use+libusb+backend|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2662953|对于windows+File>Settings>Build，Execution，Deployment>Debugger+-取消选中=>+Use+libusb+backend|2662954|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|$]]

I got it solved 
for mac
 Android>Preferences>Build,Execution, Deployment>Debugger ---Uncheck => Use libusb backend 

for windows
File>Settings>Build,Execution, Deployment>Debugger ---Uncheck => Use libusb backend

blocks|key|116211|text|更改USB端口并使用PC或笔记本电脑的另一个USB端口。这对我来说很有效！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|116212|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|$]]

Change USB port and use another USB port of your PC or Laptop. This works for me!

blocks|key|113811|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|113812|重启并在验证安卓|unordered-list-item|113813|
|113814|中禁用和启用usb+|113815|113816|113817|
+start-server|113818|daemon+server|113819|YourComputer@YourComputer:~/Android/Sdk/platform-tools$+adb+kill-server|113820|YourComputer@YourComputer:~/Android/Sdk/platform-tools$+adb+|113821|113822|ordered-list-item|113823|113824|113825|kill+and+start+adb+app+not+running；现在从tcp:5037|113826|daemon开始重新启动successfully|113827|113828|Run应用程序|113829|如果它不起作用，请确保您的电缆或连接正常|113830|113831|entityMap^0|0|0|0|0|0|0|0|0|0|0|1|1|1|1|1|1|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|18|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|19|7|@]|8|@]|9|$]]|$1|D|3|E|4|5|6|1A|7|@]|8|@]|9|$]]|$1|F|3|G|4|C|6|1B|7|@]|8|@]|9|$]]|$1|H|3|E|4|5|6|1C|7|@]|8|@]|9|$]]|$1|I|3|-4|4|C|6|1D|7|@]|8|@]|9|$]]|$1|J|3|K|4|5|6|1E|7|@]|8|@]|9|$]]|$1|L|3|M|4|C|6|1F|7|@]|8|@]|9|$]]|$1|N|3|O|4|C|6|1G|7|@]|8|@]|9|$]]|$1|P|3|Q|4|C|6|1H|7|@]|8|@]|9|$]]|$1|R|3|-4|4|C|6|1I|7|@]|8|@]|9|$]]|$1|S|3|-4|4|T|6|1J|7|@]|8|@]|9|$]]|$1|U|3|-4|4|T|6|1K|7|@]|8|@]|9|$]]|$1|V|3|-4|4|T|6|1L|7|@]|8|@]|9|$]]|$1|W|3|X|4|T|6|1M|7|@]|8|@]|9|$]]|$1|Y|3|Z|4|T|6|1N|7|@]|8|@]|9|$]]|$1|10|3|-4|4|5|6|1O|7|@]|8|@]|9|$]]|$1|11|3|12|4|T|6|1P|7|@]|8|@]|9|$]]|$1|13|3|14|4|T|6|1Q|7|@]|8|@]|9|$]]|$1|15|3|-4|4|5|6|1R|7|@]|8|@]|9|$]]|$1|16|3|-4|4|5|6|1S|7|@]|8|@]|9|$]]]|17|$]]

<ol>
<li>restart and in validate android studio</li>
<li>Disable and enable usb debugging</li>
<li>unplug device</li>
<li>plug device</li>
<li>uninstall existing app</li>
<li>kill and start adb server</li>
<li>YourComputer@YourComputer:~/Android/Sdk/platform-tools$ adb kill-server</li>
<li>YourComputer@YourComputer:~/Android/Sdk/platform-tools$ adb start-server</li>
</ol>
<ul>
<li>daemon not running; starting now at tcp:5037</li>
<li>daemon started successfully</li>
</ul>
<ol start="8">
<li>Run app again</li>
<li>if it doesn't work ensure u cable or connection is good</li>
</ol>

blocks|key|116199|text|Tools>>AVD++>>Actions+>>Select+you+Tools>>AVD+More+>>擦除Data|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|116200|重新启动设备|116201|entityMap^0|0|5|7|4|E|7|Z|5|16|H|0|0|6|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$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|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|I|$]]

Tools>>AVD Manager >>Actions >>Select you Device More >> Wipe Data

Start again Device

After update of Android Studio to 2.1.2 I've been getting the following error too many times when i make a change.

<blockquote>
 com.android.ddmlib.AdbCommandRejectedException: device offline
 
 Error while Installing APK
</blockquote>

The problem is device was never connected and is not offline

If i unplug and re-plug the device it starts working fine again. This never happened in the previous version of AS.

Question: Is there a setting to be changed in AS for this to stop happening or it is a bug?

com.android.ddmlib.AdbCommandRejectedException: device offline (Even when device is connected)

Android Studio

服务器

Android

在Android Studio更新到2.1.2之后，当我进行更改时，我收到了太多次以下错误。 com.android.ddmlib.AdbCommandRejectedException:设备脱机安装APK时出错问题是设备从未连接过且未脱机如果我拔下并重新插入设备，它又可以正常工作了。在上一版本的AS中从未发生过这种情况。问:有没有需要更改的设置，以便停止发生这种情况，或者它是一个bug？

问com.android.ddmlib.AdbCommandRejectedException:设备脱机(即使设备已连接)
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