Commits on Oct 23, 2018

1. [Mono.Android] Obsolete Mono.Android.dll for < API-19 …

   Fixes: http://work.devdiv.io/712427
   
   For the next major release of Visual Studio, Xamarin.Android will stop
   building and distributing `Mono.Android.dll` for:
   
     * v2.3 (API-10)
     * v4.0.3 (API-15)
     * v4.1 (API-16)
     * v4.2 (API-17)
     * v4.3 (API-18)
   
   This will be done for the following reasons:
   
    1. Support for API-10 and API-15 will be dropped from the
       [Android NDK][0]:
   
       > Support for ICS (android-14 and android-15) will be removed from r18
   
    2. The [Android Support Library][1], as of release 26.0.0
       (July 2017), requires API-14 or higher:
   
       > Starting with Support Library version 26.0.0 (released in July 2017),
       > the minimum supported API level has changed to Android 4.0 (API level 14)
       > for all support library packages.
   
    3. The Android Support Library replacement, [AndroidX][2], requires
       a `compileSdkVersion` minimum value of API-28 (v9.0).
   
    4. As of 2018-Oct-22, the [Android Distribution Dashboard][3] shows
       that only ~3.8% of devices hitting the Google Play Store are
       running Android 4.3 (API-18) or earlier.
   
   We want to provide a "heads-up" that these assemblies will be removed,
   to give our customers an opportunity to bump their
   `$(TargetFrameworkVersion)` to v4.4 or later.
   
   To do so, add `/package/class/@deprecated` and
   `/package/interface/@deprecated` XML attribute to *all bound types*,
   via `metadata`, for API levels 1 through 18.  This will cause all
   types to contain the following additional `[Obsolete]`:
   
   	[ObsoleteAttribute (@"The assembly `Mono.Android.dll` for this API level will be removed in a future release.  Please bump your `$(TargetFrameworkVersion)` to be v4.4 or greater.")]
   
   If one of these types is used from a project referencing a
   `Mono.Android.dll` of v4.3 or earlier, the compiler will generate the
   following warning for all such referenced types:
   
   	MainActivity.cs(30,30): Warning CS0618: 'Activity' is obsolete:
   	'The assembly `Mono.Android.dll` for this API level will be removed in a future release.
   	Please bump your `$(TargetFrameworkVersion)` to be v4.4 or greater.'
   
   [0]: https://developer.android.com/ndk/downloads/revision_history
   [1]: https://developer.android.com/topic/libraries/support-library/
   [2]: https://developer.android.com/jetpack/androidx/
   [3]: https://developer.android.com/about/dashboards/

   

   jonpryor committed Oct 23, 2018
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