Android SDK location

Try to open the Android Sdk manager and the path would be displayed on the status bar.

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The Android SDK path is usually C:\Users\<username>\AppData\Local\Android\sdk.

Do you have a screen of the content of your folder? This is my setup:

Xamarin

Folder

I hope these screenshots can help you out.

Update v3.3

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Update:

Android Studio 3.1 update, some of the icon images have changed. Click this icon in Android Studio.

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Original:

Click this icon in Android Studio for the Android SDK manager

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And your Android SDK Location will be here enter image description here

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