The project is missing Android SDKs required for building

96
votes

I'm attempting to build my first F# Android project in Visual Studio 2017 (Community Edition).

Immediately after creating a new project by using the F# - Android - Blank App template, the error window in Visual Studio displays the following message:

The project Foo is missing Android SDKs required for building. Double-click on this message and follow the prompts to install them.

No amount of double-clicking on the message causes prompts to appear.

I can't find an obvious place to download the Android SDK from:

The SDK manager that I remember from a while ago seems to have disappeared from the Android developer website.

I've installed Android Studio, which seemed to download some Android SDKs, but Visual Studio still can't seem to find whatever it's looking for.

7
androidvisual-studioxamarinxamarin.androidandroid-sdk-tools
FWIW, There are two possible reasons installing Android Studio didn't help (I tried that also): 1) A.S. installs to a different location - and changing its SDK Manager location to match V.S./Xamarin options doesn't work - A.S. doesn't cope with a location under "Program Files (x86)" - not sure if it is permissions or the spaces in the path name. So one option is to change the VS/Xamarin/Android setting to match what A.S. uses. HOWEVER 2) A.S. may install a different Android SDK Platform version than the project was set to use. (In my case, platform 27 vs 28.) Can tell AS to install... - ToolmakerSteve
... but the accepted answer is a simpler fix. I just am explaining some underlying details, in case that is useful to someone. - ToolmakerSteve

7 Answers

222
votes

I had the same issue... and Tools -> Android -> Android SDK Manager was greyed out for me.

In the end I needed to go to Tools -> Options -> Xamarin -> Android Settings and then make sure that the "Auto Install Android SDKs" was ticked. Once I ticked this and then double clicked on the error the install window suddenly appeared.

Per teapeng's answer, you may need to restart Visual Studio for this change to take effect.

25
votes

Visual Studio includes an Android SDK Manager that you use to download Android SDK tools, platforms, and other components that you need for developing Xamarin.Android apps.

See Tools -> Android -> Android SDK Manager.

Under Platforms you'll find various Android versions for the emulator and under Tools you can install various tools.

Also

See Tools -> Options -> Xamarin -> Android Settings

There is a folder path called Android SDK Location, if it's empty you can browse for it yourself to find it.

13
votes

Go to the following location:

C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\Common7\IDE\Extensions\Xamarin\AndroidSdkManager

Then run the AndroidSDK Manager Executable.

In bottom right corner, click the gear icon and change the repository to Google.

you can see the gear here

2
votes

Well I have did these two and still cannot work,

1) Tools -> Android -> Android SDK Manager

2) Tools -> Options -> Xamarin -> Android Settings and then make sure that the "Auto Install Android SDKs" was ticked

How I solve it is restart Visual Studio and then it's running. Same old trick on Windows.

2
votes

So in my case, the issue was the Visual Studio not being able to connect to the Android Server to download the files.

I did follow a thread from https://developercommunity.visualstudio.com/content/problem/241712/android-sdk-manager-fails-to-load-component-inform.html

What you can do is look up for this folder:

C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\IDE\Extensions\Xamarin\AndroidSdkManager

Create a new config file called: AndroidSdkManager.exe.config

And then add following values to the config:

<?xml version="1.0" encoding="utf-8" ?>

<configuration>
<system.net>
<defaultProxy useDefaultCredentials="true" >
</defaultProxy>
</system.net>
</configuration>

This resolved issue and Visual Studio downloaded the necessary files.

Hope this is helpful.

1
votes

if you update visual studio then this error will occour tool solve it goto Tool>Options>scrool Down>Xamarin > check "Auto Install Android SDK"

then double click on error your require SDK will Install

after Installion done Restart Visual Studio

0
votes

Since my Windows account was a standard user(Non admin). Running Visual Studio as Admin did the trick for me.