Update Android (template) to Android 9.0

[mallibone]

Updates the template for Android to target Android 9.0.

Uses the Support libraries v28 as described in this discussion #442.

[mallibone]

There seems to be an issue with the latest WPF XF platform project. I will check if it is reproducible with a C# XF app.

[SergejDK]

@mallibone
aren't there changes between XF 4.0.0.425677 and 4.0.0.482894 or are they only internal of XF?

[mallibone]

aren't there changes between XF 4.0.0.425677 and 4.0.0.482894 or are they only internal of XF?

As far as the release notes go it includes only bugfixes and under the hood improvements.

[mallibone]

So seems like there was a bug in the previous service release of Xamarin.Forms. Should be good for a final look and test run.

[SergejDK]

@mallibone

Android Java.Interop Assembly not found.
WPF Allcontrols get StackOverflowException.

[mallibone]

@SergejDK, I did not touch them intentionally and was not aware that they reference the NuGet packages locally. I'll have a look at them as soon as I get some time - having a bit of a busy week.

[mallibone]

@SergejDK after a quick peek into the solution. Am I right under the impression that paket is used to allocate the NuGet packages for the samples? It seems that this file defines the NuGet versions for the samples.

[SergejDK]

@mallibone
yes, I forgot about it.
Surely the paket files should be checked and updated, too.

[mallibone]

@SergejDK surely it is then... I am not yet that familiar with paket but I will give my best to update the packages for the samples.

[TimLariviere]

@SergejDK @mallibone The samples crashing is unrelated to this PR.
I updated them in #446
Will take a look at why they're crashing now.

[TimLariviere]

Android Java.Interop Assembly not found.

@SergejDK Where did you have this error? In the templates or the samples?
Just tried to create a new projet with the updated template and everything is good

[SergejDK]

@TimLariviere
was a failure on my side...
needed to delete bin/obj, close and open again, rebuild - everything great. (just times where this has to be done....)

[TimLariviere]

Ok. I'm merging this then. :)
Thanks @mallibone!