[build] Bump Android SDK components for Android 8.1 (#1273)

Fixes: #1266

Configuration.props

@@ -68,8 +68,8 @@
     <AllSupported32BitTargetAndroidAbis>armeabi;armeabi-v7a;x86</AllSupported32BitTargetAndroidAbis>
     <AllSupported64BitTargetAndroidAbis>arm64-v8a;x86_64</AllSupported64BitTargetAndroidAbis>
     <AllSupportedTargetAndroidAbis>$(AllSupported32BitTargetAndroidAbis);$(AllSupported64BitTargetAndroidAbis)</AllSupportedTargetAndroidAbis>
-    <XABuildToolsVersion>26.0.1</XABuildToolsVersion>
-    <XABuildToolsFolder Condition="'$(XABuildToolsFolder)' == ''">26.0.1</XABuildToolsFolder>
+    <XABuildToolsVersion>27.0.3</XABuildToolsVersion>
+    <XABuildToolsFolder Condition="'$(XABuildToolsFolder)' == ''">27.0.3</XABuildToolsFolder>
     <XAIntegratedTests Condition="'$(XAIntegratedTests)' == ''">False</XAIntegratedTests>
     <PathSeparator>$([System.IO.Path]::PathSeparator)</PathSeparator>
     <TestsAotName Condition=" '$(AotAssemblies)' == 'true' ">-Aot</TestsAotName>

build-tools/android-toolchain/android-toolchain.projitems

@@ -15,11 +15,11 @@
       <HostOS>Linux</HostOS>
       <DestDir>build-tools\$(XABuildToolsFolder)</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="platform-tools_r26.0.0-linux.zip">
+    <AndroidSdkItem Include="platform-tools_r27.0.1-linux.zip">
       <HostOS>Linux</HostOS>
       <DestDir>platform-tools</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="sdk-tools-linux-3952940.zip">
+    <AndroidSdkItem Include="sdk-tools-linux-4333796.zip">
       <HostOS>Linux</HostOS>
       <DestDir>tools</DestDir>
     </AndroidSdkItem>
@@ -34,11 +34,11 @@
       <HostOS>Darwin</HostOS>
       <DestDir>build-tools\$(XABuildToolsFolder)</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="platform-tools_r26.0.0-darwin.zip">
+    <AndroidSdkItem Include="platform-tools_r27.0.1-darwin.zip">
       <HostOS>Darwin</HostOS>
       <DestDir>platform-tools</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="sdk-tools-darwin-3952940.zip">
+    <AndroidSdkItem Include="sdk-tools-darwin-4333796.zip">
       <HostOS>Darwin</HostOS>
       <DestDir>tools</DestDir>
     </AndroidSdkItem>
@@ -53,11 +53,11 @@
       <HostOS>Windows</HostOS>
       <DestDir>build-tools\$(XABuildToolsFolder)</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="platform-tools_r26.0.0-windows.zip">
+    <AndroidSdkItem Include="platform-tools_r27.0.1-windows.zip">
       <HostOS>Windows</HostOS>
       <DestDir>platform-tools</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="sdk-tools-windows-3952940.zip">
+    <AndroidSdkItem Include="sdk-tools-windows-4333796.zip">
       <HostOS>Windows</HostOS>
       <DestDir>tools</DestDir>
     </AndroidSdkItem>

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets

@@ -232,9 +232,9 @@ Copyright (C) 2011-2012 Xamarin. All rights reserved.
 	     Disable generation to avoid "bizarre" build errors. -->
 	<GenerateSerializationAssemblies>Off</GenerateSerializationAssemblies>
 
-	<AndroidSdkBuildToolsVersion Condition="'$(AndroidSdkBuildToolsVersion)' == ''">23.0.0</AndroidSdkBuildToolsVersion>
-	<AndroidSdkPlatformToolsVersion Condition="'$(AndroidSdkPlatformToolsVersion)' == ''">25.0.5</AndroidSdkPlatformToolsVersion>
-	<AndroidSdkToolsVersion Condition="'$(AndroidSdkToolsVersion)' == ''">25.2.5</AndroidSdkToolsVersion>
+	<AndroidSdkBuildToolsVersion Condition="'$(AndroidSdkBuildToolsVersion)' == ''">27.0.3</AndroidSdkBuildToolsVersion>
+	<AndroidSdkPlatformToolsVersion Condition="'$(AndroidSdkPlatformToolsVersion)' == ''">27.0.1</AndroidSdkPlatformToolsVersion>
+	<AndroidSdkToolsVersion Condition="'$(AndroidSdkToolsVersion)' == ''">26.1.1</AndroidSdkToolsVersion>
 	<AndroidNdkVersion Condition="'$(AndroidNdkVersion)' == ''">r14b</AndroidNdkVersion>
 
 	<!-- Obsolete -->