I have recently updated Android Studio from 2.2.3 to 2.3. Now can't see the option "Launch Standalone SDK Manager", which is useful to check for updates, google play services, etc.
It is a deprecated feature: https://code.google.com/p/android/issues/detail?id=235625 There is an option in Android Studio to "Show Package Details".
For manual SDK and AVD management, please use Android Studio. For command-line tools, use tools/bin/sdkmanager and tools/bin/avdmanager
Even I had this issue when I updated to Android Studio 2.3
Click on Configure on the bottom left side
Select the Check Box to Show Package Details on the bottom left side
Move between the different tabs as per your requirements.
Can't working on Android Studio 2.3.3
On Mac :
/Users/YourAccount/Library/Android/sdk/tools
click android, you'll see standalone SDK manager
On Windows :
C:\Productivity\android-sdks\tools
double click on android.bat, standalone SDK Manger will be launched (see image below).
As the standalone sdk manager has been deprecated in favor of studio builtin sdk manager, there's a workaround to get back the standalone sdk manager.
Step1.
Download command line sdk tools for your platform:
http://dl.google.com/android/installer_r24-windows.exe
http://dl.google.com/android/android-sdk_r24-windows.zip
the links refer to an old distribution intentionally (see note below).
Step2.
Copy the SDK Manager.exe, tools/android.bat and tools/lib/archquery.jar into your existing sdk to which android studio is currently being pointed.
Step3.
Run SDK Manager or tools/android.bat and you will get back your beloved standalone sdk manager while having latest android studio > 2.3
Note
if you download latest command line tools for sdk, you wont be able to find the archquery.jar which is required to run the standalone sdk utility.
In this latest version (2.3.1 and 2.3.1+), after some digging, I found a faster way to open AVD and SDK: In the welcome interface of Android Studio, after pressing CTRL+SHIFT+A, a search box will jump out, then you can input "AVD", the AVD manager will come out. To open SDK is the same way.
However, AVD does not work in the welcome interface but SDK works. If you want to use CTRL+SHIFT+A to quickly open AVD you must create a new project and open AVD in the project interface.
If you are a Xamarin user, you can install the Xamarin Android SDK Manager, available on the Visual Studio Marketplace which will give you an interface like this:
NOTE: The Xamarin SDK manager has to be accessed from visual studio, but it will (should) work on both windows and mac
You can open it from your SDK path which in my case is
C:\Users\Akshay\AppData\Local\Android\sdk
Double click on SDK Manager.exe and it will open standalone SDK manager, refer attached Screenshot.
来源：https://stackoverflow.com/questions/42577166/standalone-sdk-manager-option-in-android-studio-2-3