This PR don’t solve the problem I solve the issue creating a uxl with:
<Extensions Backend="CPlusPlus">
<Require Condition="Android" AndroidManifest.ApplicationElement>
<![CDATA[
<uses-library android:name="org.apache.http.legacy" android:required="false"/>
]]>
</Require>
</Extensions>
I find the solution on https://stackoverflow.com/questions/50782806/android-google-maps-java-lang-noclassdeffounderror-failed-resolution-of-lorg-a .