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Error APT0000: No resource identifier found for attribute 'touchscreenBlocksFocus' in package 'android' (APT0000) (Test)
Can't compile unless API target is set to level 21
Common problem. See https://forums.xamarin.com/discussion/comment/141636
I believe you should use Google Play Services (Froyo) package that builds as old as Froyo. The latest Xamarin.Android does not suppport pre-Gingerbread anymore though.
Also you could specify different minSdkVersion (whatever you need) from targetSdkVersion (specify 21 or higher).
I'm leaving this report to the Component team (who actually creates those packages) for their comments.
The fix is in the forum post, set your target api level to 21 or higher.
Unfortunately, this is the same on Google's own tooling for these libraries since aapt needs to compile against the higher api level to see the attributes. You can still set your minSdkVersion as Atsushi mentioned to a lower API level.