- Download this two files (https://raw.githubusercontent.com/atsushieno/monodroid-schema-gen/master/schemas.android.com.apk.res.android.xsd and https://raw.githubusercontent.com/atsushieno/monodroid-schema-gen/master/android-layout-xml.xsd) to “C:\Program Files (x86)\MSBuild\Xamarin\Android” (if there is no such files there).
- Start “Developer Command Prompt for VS2015”
- Execute “devenv /resetsettings”
- Open *.axml file in your solution with “Open with” and select “Automatic editor selector (XML)”

- If intellisense still not working go to XML -> Schemas, add this schemas manually and restart visual studio

You Will be able to see intellisense in xaml.
Happy coding 🙂