blocks|key|4359831|text|问题就解决了。我遇到的问题是我将SDK平台工具升级到了25.0.6。但是我的SDK构建工具是25.0.3。(25.0.6尚未提供)我猜版本不匹配，这导致了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4359832|我将我的SDK平台工具降级到25.0.3，它像往常一样工作。|4359833|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|$]]

The problem is solved. The issue I have is I upgraded the SDK platform-tools to 25.0.6. But My SDK Build-Tools is 25.0.3. (25.0.6 is not yet provided) I guess the version did not match which cause this problem. 

I downgrade my SDK platform-tools to 25.0.3 and it is working as usual.

blocks|key|4359596|text|也有同样的问题。解决方案是Avast删除了adb.exe。尝试将SDK文件夹添加到防病毒白名单中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4359597|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. Solution was that Avast deleted the adb.exe.
Try adding the SDK folder to your antivirus whitelist.

blocks|key|4359643|text|对我有效的方法(在安装了AS+2.x和AS+3.x并尝试让Canary+3.1正常工作后)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4359644|有时在更新/尝试加载新版本的Android+Studio时，更新程序/补丁程序会出错。它可能会在声明将停止并更新它之后删除adb，它可能是快速启动或aapt…管他呢。|4359645|对我来说，有效的方法是删除整个sdk/+platform+-tools文件夹，重新启动AS，然后重新下载整个平台工具包。|4359646|然后再次启动AS并转到文件->无效缓存/重新启动。|4359647|如果您一直在更新Java，您可能还希望确保您的JAVA_HOME是正确的，并且您的AS项目已经被设置为正确的JDK+(项目设置)。|4359648|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|N|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|O|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|K|$]]

What worked for me (after having AS 2.x and AS 3.x installed and trying to get Canary 3.1 to work):

Sometimes during an update/trying to sideload a new version of Android Studio, the updater/patcher screws up. It might delete adb after saying it will stop and update it, it might be fastboot or aapt ... whatever.

What works for me is to delete the whole sdk/platform-tools folder, restart AS and get it to redownload the entire platform tools package.

Then start AS again and go to File->Invalidate caches/restart.

If you have been updating Java, you might also want to ensure your JAVA_HOME is correct and that your AS project has been set to the correct JDK (project settings).

blocks|key|4359679|text|是的，看起来很多人(太多人了，谷歌为你感到羞耻)都想出了一个缺失的“adb.exe”症状。(在我的例子中，我声称在我的Windows-10捆绑安装Android+Studio+3.1.2版的过程中，它根本没有安装过。)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4359680|好的，这是我推荐的解决方案(我借用了这个问题并稍微修改了一下)：Android+Studio+SDK+installer+hangs+indefinitely+at+Unzipping+'platform-tools/systrace/NOTICE'|offset|length|4359681|第二个(？)答案基本上是正确的……“Dx+Arout”大胆而正确地推荐：|4359682|(1)从C:\Users\AppData\Local\Android\Sdk位置删除platform-tools|4359683|他/她有了正确的想法，然后启动Android+Studio，并试图让它抱怨并提出解决问题，让you...says：|4359684|(2)重启Android+Studio。gradle构建完成后，它将要求安装缺少的工具。只需单击此处。它应该工作得很好。|4359685|嗯，不，不完全是。它没有问我任何问题，因为我没有从当前项目的构建中得到任何错误。所以，我不得不“踢它在*ss”，通过启动Tools+->+SDK管理器，选择中间的标签(“SDK+Tools”)，并进入一个已经安装的名为“Android+SDK+Build-Tools+28-rc2”的条目(您的确切版本条目可能会有所不同)。所以，点击它的复选框，选择“Show+package+details”复选框(右下角)。我点亮了所有的包变体，并强制它安装所有这些包。这可能有些夸张，但当我启动调试运行时，确实安装了完成'adb‘的voila...once。(在“logcat”标签的日志消息窗口中，两个红色的标题终于变成了黑色，调试终于可以使用了！|4359686|干杯..。|4359687|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/42100297^0|0|W|2L|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|F|3|G|5|6|7|14|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|17|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|18|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|19|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

Yep, looks like LOTS of folks (way too many, shame on you, Google) have come up with a missing 'adb.exe' symptom. (In my case, I claim that it never got installed at all, during my Windows-10 bundled installation of Android Studio,
version 3.1.2.)

Ok, here's my recommended solution (which I borrowed and modified slightly from
this question): <a href="https://stackoverflow.com/questions/42100297">Android Studio SDK installer hangs indefinitely at Unzipping &#39;platform-tools/systrace/NOTICE&#39;</a>

The second(?) answer is essentially correct..."Dx Arout" boldly and correctly recommends:

(1) Delete platform-tools from this location C:\Users\AppData\Local\Android\Sdk

and he/she's got the right idea, to then launch Android Studio and try to get it to complain and offer to fix the problem for you...says to:

(2) Then restart Android Studio. After gradle build finish it will ask for installation of missing tools. just click there. It should work fine.

Well, no, not quite. It didn't ask me anything, because I didn't get any
errors from current proj's build. So, I had to 'kick-it-in-the-*ss', by
launching Tools -> SDK Manager, choosing the middle tab ('SDK Tools'), and going to an already-installed entry named 'Android SDK Build-Tools 28-rc2' (your exact version entry may be somewhat different). So, click on its checkbox, choose 'Show package details' checkbox (down in lower-right corner). I lit up ALL the package variants, and forced it to install them all. That may have been overkill, but voila...once that completed, 'adb' DID get installed, as confirmed
when I launched a debug run. (Down in the 'logcat' tab's log-message window, the two RED headings, finally turned to black and debugging was finally USEABLE!

Cheers...

blocks|key|4359727|text|我也面临着这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4359728|avast+antivirus已将文件adb.exe移动到病毒箱，这就是问题的原因。我已经通过恢复avast的病毒箱中的adb.exe解决了这个问题。|4359729|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 also faced the issue.

The avast antivirus had moved the file adb.exe to the virus chest and that was the cause of the issue. I have resolved it by restoring the adb.exe from the virus chest of avast.

blocks|key|4359766|text|如果安装了杀毒软件，adb.exe将不会出现，我们需要将其列入白名单。防病毒软件会阻止它，因为它会发现.exe文件，所以会阻止它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4359767|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|$]]

adb.exe won't appear if antivirus is installed and we need to whitelist this.
Anti virus block this because as it find .exe file so it will block it.

blocks|key|4359796|text|找不到adb。我不得不从AVD管理器中删除虚拟设备，创建另一个虚拟设备。现在已成功连接虚拟设备|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4359797|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|$]]

no adb found. I had to delete the virtual device from AVD manager create another. now virtual device connected succesfully

Today, I clicked some update when I launch Android Stodio. I forgot what it is. Then, I run some code when there is a error 
"8:34 PM IllegalArgumentException: Unable to locate adb"

Then, I google for few hours and still cannot solve my problem. And I found that there is no "adb.exe" under my platform-tools folder.

Can someone help?

my os is Window 10.
I have tried uninstall Android Studio and install it back. It doesn't help.

Edit 1: After I re-install the platform-tools, I get back the adb.exe.But, I run my program again, it does the "ADB initialization", my adb.exe file lose again.

android studio platform-tools missing adb.exe

Android Studio

Android

Windows

Java

今天，当我启动Android Stodio时，我点击了一些更新。我都忘了那是什么了。然后，当出现错误"8:34 PM IllegalArgumentException: Unable to locate adb“时，我运行一些代码。然后，我在谷歌上搜索了几个小时，仍然无法解决我的问题。我发现在我的platform-tools文件夹下没有"adb.exe“。有人能帮帮忙吗？我的操作系统是window

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