blocks|key|4661936|text|我修改了我的/etc/hosts文件，并确保这3行位于文件的底部：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4661937|127.0.0.1+++++++localhost
255.255.255.255+broadcasthost
::1+++++++++++++localhost|code-block|syntax|javascript|4661938|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|$]]

Well, what it worked for me:
I have change my /etc/hosts file and make sure that those 3 lines are on the bottom of the file:

<pre><code>127.0.0.1 localhost
255.255.255.255 broadcasthost
::1 localhost
</code></pre>

blocks|key|4661836|text|这就是我解决同样问题的方法：(1)移除或断开你的手机！(2)重新连接你的手机！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4661837|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|$]]

This is how I solved same issue:
(1)remove or disconnect your phone !
(2) connect your phone again!

blocks|key|4661867|text|我只需重启我的Android工作室就解决了这个问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4661868|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 solved this problem just restarting my Android studio

blocks|key|4662138|text|在所有解决方案失败后。我做了一个变通办法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4662139|1)正常运行app。|4662140|📷|atomic|offset|length|4662141|​|4662142|2)将调试器附加到android进程。|4662143|4662144|4662145|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c56f3ca0210e8c3f3e9af5eb88ae3017.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/c210a89595c5bb236745b1bf90362a67.png^0|0|0|0|1|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@$G|12|H|13|1|14]]|A|$]]|$1|I|3|J|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|E|5|F|7|17|8|@]|9|@$G|18|H|19|1|1A]]|A|$]]|$1|N|3|J|5|6|7|1B|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V|W|-4]]|X|$5|R|S|T|A|$U|Y|W|-4]]]]

After failure of all the solutions. I made a work around:

1) Run the app normally. <a href="https://i.stack.imgur.com/twlVF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/twlVF.png" alt="enter image description here"></a>

2) Attach the debugger to android process. <a href="https://i.stack.imgur.com/plRZT.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/plRZT.png" alt="enter image description here"></a>

blocks|key|155447|text|如果您在Androidx86+OS上使用VirtualBox，那么您需要首先唤醒模拟器:+Machine+->+ACPI+Shutdown+(Host%2BU)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|155448|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 are using VirtualBox with Androidx86 OS then you need to wake up simulator first: Machine -> ACPI Shutdown (Host+U)

blocks|key|4661790|text|对于每个还没有解决这个问题的人来说，./adb+get-state为我工作。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4661791|但是，当我第二次遇到这个问题时，原因是在debug按钮旁边一个名为Select+Run/Debug+Configuration的下拉菜单中选择了错误的项目。在该菜单中选择App就可以解决这个问题。(请参阅此问题的答案：Android+Studio+Always+Disconnect+Immediately+after+beginning+"debug")|4661792|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/27905119/android-studio-always-disconnect-immediately-after-beginning-debug^0|I|F|0|X|U|2D|3|31|1W|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|H|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]]]

To everyone that hasn't solved this problem yet, <code>./adb get-state</code> worked for me. 

But, the second time I got this problem, the cause was the wrong item selected in a drop down menu called <code>Select Run/Debug Configuration</code> beside the debug button. Select <code>App</code> in that menu would solved the problem.
(Refer to answer to this question: <a href="https://stackoverflow.com/questions/27905119/android-studio-always-disconnect-immediately-after-beginning-debug">Android Studio Always Disconnect Immediately after beginning &quot;debug&quot;</a>)

blocks|key|155583|text|对我来说，有另一个DDMS实例(不是Android+studio)正在运行……我关闭了它，并重新启动了Debug+...started。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|155584|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, there was one another instance of DDMS(other than Android studio) was running...I closed that and restarted the Debug ...started working.

blocks|key|4661968|text|在Windows环境中，我启动了Taskmgr，它显示了正在运行的调试器的许多副本。关闭并重新启动Android+Studio解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4661969|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 a Windows environment, I brought up Taskmgr and it showed many copies of the debugger running. Shutting down Android Studio and restarting it solved the problem.

blocks|key|155669|text|在我的例子中，我编辑了etc/hosts的所有内容。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|155670|清除文件/etc/hosts调试工作。|155671|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|$]]

in my case i edited etc/hosts's everything goes wrong.

clear files /etc/hosts debug work.

blocks|key|4661813|text|我也得到了这个错误，其他的答案对我来说都不起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4661814|我通过移除|4661815|multiDexEnabled+true|offset|length|style|CODE|4661816|从我在build.gradle文件中的调试配置。|4661817|entityMap^0|0|0|0|K|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@$F|Q|G|R|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

I also got this error, and the other answers didn't work for me.

I fixed it by removing 

<code>multiDexEnabled true</code> 

from my debug configuration in the build.gradle file.

Android Studio can't connect to debug devices.

When I click the debug button, the debug tab shows me

<pre><code>Connecting to the target VM, address: 'localhost:8600', transport: 'socket'
</code></pre>

in variables 

When I tried again it told me 

<pre><code>12:14:44 Error running Android Debugger (8600): Unable to open debugger port : java.io.IOException "handshake failed - connection prematurely closed"
</code></pre>

and then debug tab show me this 

<pre><code> Disconnected from the target VM, address: 'localhost:8600', transport: 'socket'
</code></pre>

in variables

My Android Studio version is <code>0.4.4 #AI133-1005886</code>

This problem has been haunting me for a long time.

i use OS X

android studio can't connect to debug devices

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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Android Studio无法连接到调试设备。当我单击“调试”按钮时，“调试”选项卡将显示Connecting to the target VM, address: 'localhost:8600', transport: 'socket'在变量中当我再试一次时，它告诉我12:14:44 Error running Android Debugger (8600): Unable to open 

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