diff --git a/Configuration.props b/Configuration.props
index 1d745dd75f4..e13031a9bc4 100644
--- a/Configuration.props
+++ b/Configuration.props
@@ -113,7 +113,7 @@
     <AndroidToolPath Condition=" '$(AndroidToolPath)' == '' ">$(AndroidSdkFullPath)\tools</AndroidToolPath>
     <AndroidToolsBinPath Condition=" '$(AndroidToolsBinPath)' == '' ">$(AndroidToolPath)\bin</AndroidToolsBinPath>
     <AndroidToolExe Condition=" '$(AndroidToolExe)' == '' ">android</AndroidToolExe>
-    <EmulatorToolPath Condition=" '$(EmulatorToolPath)' == '' ">$(AndroidSdkFullPath)\tools</EmulatorToolPath>
+    <EmulatorToolPath Condition=" '$(EmulatorToolPath)' == '' ">$(AndroidSdkFullPath)\emulator</EmulatorToolPath>
     <EmulatorToolExe Condition=" '$(EmulatorToolExe)' == '' ">emulator</EmulatorToolExe>
     <NdkBuildPath Condition=" '$(NdkBuildPath)' == '' And '$(HostOS)' != 'Windows' ">$(AndroidNdkDirectory)\ndk-build</NdkBuildPath>
     <NdkBuildPath Condition=" '$(NdkBuildPath)' == '' And '$(HostOS)' == 'Windows' ">$(AndroidNdkDirectory)\ndk-build.cmd</NdkBuildPath>
diff --git a/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/Adb.cs b/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/Adb.cs
index 5dd87e5f507..ced5311531d 100644
--- a/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/Adb.cs
+++ b/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/Adb.cs
@@ -59,7 +59,7 @@ protected override string GenerateCommandLineCommands ()
 
 		protected override void LogEventsFromTextOutput (string singleLine, MessageImportance messageImportance)
 		{
-			base.LogEventsFromTextOutput (singleLine, messageImportance);
+			Log.LogMessage (MessageImportance.Low, singleLine);
 			Lines.Add (singleLine);
 		}
 	}
diff --git a/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/CreateAndroidEmulator.cs b/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/CreateAndroidEmulator.cs
index c332f2b9cfd..24dbdbb21f0 100644
--- a/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/CreateAndroidEmulator.cs
+++ b/build-tools/Xamarin.Android.Tools.BootstrapTasks/Xamarin.Android.Tools.BootstrapTasks/CreateAndroidEmulator.cs
@@ -22,7 +22,11 @@ public class CreateAndroidEmulator : Task
 
 		public                  string          TargetId        {get; set;}
 
-		public                  string          ImageName       {get; set;} = "XamarinAndroidTestRunner";
+		public                  string          ImageName           {get; set;} = "XamarinAndroidTestRunner";
+
+		public                  string          DataPartitionSizeMB {get; set;} = "2048";
+		public                  string          RamSizeMB           {get; set;} = "2048";
+
 
 		public override bool Execute ()
 		{
@@ -68,6 +72,29 @@ void Run (string android)
 
 			var arguments   = $"create avd --abi {AndroidAbi} -f -n {ImageName} --package \"{TargetId}\"";
 			Exec (android, arguments);
+
+			string configPath = Path.Combine (Environment.GetFolderPath (Environment.SpecialFolder.Personal), ".android", "avd", $"{ImageName}.avd", "config.ini");
+			if (!File.Exists (configPath)) {
+				Log.LogWarning ($"Config file for AVD '{ImageName}' not found at {configPath}");
+				Log.LogWarning ($"AVD '{ImageName}' will use default emulator settings (memory and data partition size)");
+				return;
+			}
+
+			ulong diskSize;
+			if (!UInt64.TryParse (DataPartitionSizeMB, out diskSize))
+				Log.LogError ($"Invalid data partition size '{DataPartitionSizeMB}' - must be a positive integer value expressing size in megabytes");
+
+			ulong ramSize;
+			if (!UInt64.TryParse (RamSizeMB, out ramSize))
+				Log.LogError ($"Invalid RAM size '{RamSizeMB}' - must be a positive integer value expressing size in megabytes");
+
+			if (Log.HasLoggedErrors)
+				return;
+
+			File.AppendAllLines (configPath, new string[] {
+				$"disk.dataPartition.size={diskSize}M",
+				$"hw.ramSize={ramSize}"
+			});
 		}
 
 		StreamWriter stdin;
diff --git a/build-tools/android-toolchain/android-toolchain-windows.targets b/build-tools/android-toolchain/android-toolchain-windows.targets
deleted file mode 100644
index db7d34d94e7..00000000000
--- a/build-tools/android-toolchain/android-toolchain-windows.targets
+++ /dev/null
@@ -1,103 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <UsingTask AssemblyFile="$(MSBuildThisFileDirectory)..\..\bin\Build$(Configuration)\xa-prep-tasks.dll"  TaskName="Xamarin.Android.BuildTools.PrepTasks.AcceptAndroidSdkLicenses" />
-  <UsingTask AssemblyFile="$(MSBuildThisFileDirectory)..\..\bin\Build$(Configuration)\xa-prep-tasks.dll"  TaskName="Xamarin.Android.BuildTools.PrepTasks.GitCommitHash" />
-  <Target Name="_CopyBootstrapTasksAssembly"
-      Outputs="$(OutputPath)\Xamarin.Android.Tools.BootstrapTasks.dll">
-    <MSBuild
-        Projects="..\Xamarin.Android.Tools.BootstrapTasks\Xamarin.Android.Tools.BootstrapTasks.csproj"
-        Properties="OutputPath=$(AndroidToolchainDirectory)\"
-    />
-  </Target>
-  <UsingTask AssemblyFile="..\..\bin\Build$(Configuration)\Xamarin.Android.Tools.BootstrapTasks.dll" TaskName="Xamarin.Android.Tools.BootstrapTasks.UnzipDirectoryChildren" />
-  <PropertyGroup>
-    <BuildDependsOn>
-      ResolveReferences;
-      _CopyBootstrapTasksAssembly;
-      _DownloadItems;
-      _UnzipFiles;
-      _AcceptAndroidSdkLicenses;
-    </BuildDependsOn>
-  </PropertyGroup>
-  <Target Name="_DetermineItems">
-    <CreateItem
-        Include="@(AndroidSdkItem)"
-        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
-      <Output TaskParameter="Include" ItemName="_PlatformAndroidSdkItem"/>
-    </CreateItem>
-    <CreateItem
-        Include="@(AndroidNdkItem)"
-        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
-      <Output TaskParameter="Include" ItemName="_PlatformAndroidNdkItem"/>
-    </CreateItem>
-    <CreateItem
-        Include="@(AntItem)"
-        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
-      <Output TaskParameter="Include" ItemName="_PlatformAntItem"/>
-    </CreateItem>
-    <ItemGroup>
-        <_SdkStampFiles Include="@(_PlatformAndroidSdkItem->'$(AndroidToolchainDirectory)\sdk\.stamp-%(Identity)')" />
-    </ItemGroup>
-    <ItemGroup>
-      <_SdkStampFiles Include="@(_PlatformAntItem->'$(AntDirectory)\.stamp-%(Identity)')" />
-    </ItemGroup>
-    <ItemGroup>
-      <_DownloadedItem Include="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')" />
-      <_DownloadedItem Include="@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')" />
-      <_DownloadedItem Include="@(_PlatformAntItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')" />
-    </ItemGroup>
-  </Target>
-  <Target Name="_DownloadItems"
-      DependsOnTargets="_DetermineItems"
-      Outputs="@(_DownloadedItem)">
-    <MakeDir Directories="$(AndroidToolchainCacheDirectory)" />
-    <DownloadUri
-        SourceUris="@(_PlatformAndroidSdkItem->'$(AndroidUri)/%(RelUrl)%(Identity).zip');@(_PlatformAndroidNdkItem->'$(AndroidUri)/%(RelUrl)%(Identity).zip')"
-        DestinationFiles="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip');@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
-    />
-    <DownloadUri
-        SourceUris="@(_PlatformAntItem->'$(AntUri)/%(RelUrl)%(Identity).zip')"
-        DestinationFiles="@(_PlatformAntItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
-    />
-  </Target>
-  <Target Name="_UnzipFiles"
-      DependsOnTargets="_DetermineItems"
-      Inputs="@(_DownloadedItem)"
-      Outputs="@(_SdkStampFiles);$(AndroidToolchainDirectory)\ndk\.stamp-ndk">
-    <CreateItem
-        Include="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(_PlatformAndroidSdkItem.Identity).zip'">
-      <Output TaskParameter="Include" ItemName="_AndroidSdkItems"/>
-    </CreateItem>
-    <CreateItem
-        Include="@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(_PlatformAndroidNdkItem.Identity).zip'"
-        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
-      <Output TaskParameter="Include" ItemName="_AndroidNdkItems"/>
-    </CreateItem>
-
-    <RemoveDir Directories="$(AndroidSdkDirectory);$(AndroidNdkDirectory);$(AntDirectory)" />
-    <MakeDir Directories="$(AndroidSdkDirectory);$(AndroidNdkDirectory);$(AntDirectory)" />
-
-    <UnzipDirectoryChildren
-        HostOS="$(HostOS)"
-        SourceFiles="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
-        DestinationFolder="$(AndroidToolchainDirectory)\sdk"
-    />
-    <UnzipDirectoryChildren
-        HostOS="$(HostOS)"
-        SourceFiles="@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
-        DestinationFolder="$(AndroidToolchainDirectory)\ndk"
-    />
-    <UnzipDirectoryChildren
-        HostOS="$(HostOS)"
-        SourceFiles="@(_PlatformAntItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
-        DestinationFolder="$(AntDirectory)"
-    />
-    <Touch
-        Files="@(_SdkStampFiles);$(AndroidToolchainDirectory)\ndk\.stamp-ndk"
-        AlwaysCreate="True"
-    />
-  </Target>
-  <Target Name="_AcceptAndroidSdkLicenses">
-    <AcceptAndroidSdkLicenses AndroidSdkDirectory="$(AndroidSdkDirectory)" JavaSdkDirectory="$(JavaSdkDirectory)" />
-  </Target>
-</Project>
diff --git a/build-tools/android-toolchain/android-toolchain.csproj b/build-tools/android-toolchain/android-toolchain.csproj
index 6b432b215d5..842439ec6b3 100644
--- a/build-tools/android-toolchain/android-toolchain.csproj
+++ b/build-tools/android-toolchain/android-toolchain.csproj
@@ -16,8 +16,7 @@
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <Import Project="android-toolchain.projitems" />
   <Import Project="..\scripts\RequiredPrograms.targets" />
-  <Import Project="android-toolchain.targets" Condition=" '$(HostOS)' != 'Windows' " />
-  <Import Project="android-toolchain-windows.targets" Condition=" '$(HostOS)' == 'Windows' " />
+  <Import Project="android-toolchain.targets" />
   <ItemGroup>
     <ProjectReference Include="..\xa-prep-tasks\xa-prep-tasks.csproj">
       <Project>{7CE69551-BD73-4726-ACAA-AAF89C84BAF8}</Project>
diff --git a/build-tools/android-toolchain/android-toolchain.projitems b/build-tools/android-toolchain/android-toolchain.projitems
index e34657e8d2c..214f8f64cef 100644
--- a/build-tools/android-toolchain/android-toolchain.projitems
+++ b/build-tools/android-toolchain/android-toolchain.projitems
@@ -15,7 +15,7 @@
       <HostOS>Linux</HostOS>
       <DestDir>build-tools\$(XABuildToolsFolder)</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="platform-tools_r27.0.1-linux">
+    <AndroidSdkItem Include="platform-tools_r28.0.0-linux">
       <HostOS>Linux</HostOS>
       <DestDir>platform-tools</DestDir>
     </AndroidSdkItem>
@@ -23,7 +23,7 @@
       <HostOS>Linux</HostOS>
       <DestDir>tools</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="emulator-linux-4773671">
+    <AndroidSdkItem Include="emulator-linux-4969155">
       <HostOS>Linux</HostOS>
       <DestDir>emulator</DestDir>
     </AndroidSdkItem>
@@ -34,7 +34,7 @@
       <HostOS>Darwin</HostOS>
       <DestDir>build-tools\$(XABuildToolsFolder)</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="platform-tools_r27.0.1-darwin">
+    <AndroidSdkItem Include="platform-tools_r28.0.0-darwin">
       <HostOS>Darwin</HostOS>
       <DestDir>platform-tools</DestDir>
     </AndroidSdkItem>
@@ -42,7 +42,7 @@
       <HostOS>Darwin</HostOS>
       <DestDir>tools</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="emulator-darwin-4773671">
+    <AndroidSdkItem Include="emulator-darwin-4969155">
       <HostOS>Darwin</HostOS>
       <DestDir>emulator</DestDir>
     </AndroidSdkItem>
@@ -53,7 +53,7 @@
       <HostOS>Windows</HostOS>
       <DestDir>build-tools\$(XABuildToolsFolder)</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="platform-tools_r27.0.1-windows">
+    <AndroidSdkItem Include="platform-tools_r28.0.0-windows">
       <HostOS>Windows</HostOS>
       <DestDir>platform-tools</DestDir>
     </AndroidSdkItem>
@@ -61,7 +61,7 @@
       <HostOS>Windows</HostOS>
       <DestDir>tools</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="emulator-windows-4773671">
+    <AndroidSdkItem Include="emulator-windows-4969155">
       <HostOS>Windows</HostOS>
       <DestDir>emulator</DestDir>
     </AndroidSdkItem>
@@ -133,10 +133,10 @@
       <HostOS></HostOS>
       <DestDir>extras\android\m2repository</DestDir>
     </AndroidSdkItem>
-    <AndroidSdkItem Include="x86-21_r05">
+    <AndroidSdkItem Include="x86-28_r04">
       <HostOS></HostOS>
       <RelUrl>sys-img/android/</RelUrl>
-      <DestDir>system-images\android-21\default\x86</DestDir>
+      <DestDir>system-images\android-28\default\x86</DestDir>
     </AndroidSdkItem>
   </ItemGroup>
   <ItemGroup>
diff --git a/build-tools/android-toolchain/android-toolchain.targets b/build-tools/android-toolchain/android-toolchain.targets
index 904141636ce..552148285eb 100644
--- a/build-tools/android-toolchain/android-toolchain.targets
+++ b/build-tools/android-toolchain/android-toolchain.targets
@@ -6,7 +6,8 @@
     <BuildDependsOn>
       ResolveReferences;
       _CopyBootstrapTasksAssembly;
-      _CreateAndroidToolchains;
+      _DownloadItems;
+      _UnzipFiles;
       _CreateMxeToolchains;
       _AcceptAndroidSdkLicenses;
     </BuildDependsOn>
@@ -18,26 +19,93 @@
         Properties="OutputPath=$(AndroidToolchainDirectory)\"
     />
   </Target>
-  <Target Name="_PrepareAndroidToolchainItems">
+  <UsingTask AssemblyFile="..\..\bin\Build$(Configuration)\Xamarin.Android.Tools.BootstrapTasks.dll" TaskName="Xamarin.Android.Tools.BootstrapTasks.UnzipDirectoryChildren" />
+  <Target Name="_DetermineItems">
+    <CreateItem
+        Include="@(AndroidSdkItem)"
+        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
+			<Output TaskParameter="Include" ItemName="_PlatformAndroidSdkItem"/>
+    </CreateItem>
+    <CreateItem
+        Include="@(AndroidNdkItem)"
+        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
+			<Output TaskParameter="Include" ItemName="_PlatformAndroidNdkItem"/>
+    </CreateItem>
+    <CreateItem
+        Include="@(AntItem)"
+        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
+      <Output TaskParameter="Include" ItemName="_PlatformAntItem"/>
+    </CreateItem>
     <ItemGroup>
-      <_AndroidSdkStampFiles Include="@(AndroidSdkItem->'$(AndroidToolchainDirectory)\sdk\.stamp-%(Identity)')" Condition=" '%(AndroidSdkItem.HostOS)' == '$(HostOS)' Or '%(AndroidSdkItem.HostOS)' == '' " />
-      <_AndroidNdkStampFiles Include="@(AndroidNdkItem->'$(AndroidToolchainDirectory)\ndk\.stamp-%(Identity)')" Condition=" '%(AndroidNdkItem.HostOS)' == '$(HostOS)' Or '%(AndroidNdkItem.HostOS)' == '' " />
-      <_AntStampFiles Include="@(AntItem->'$(AndroidToolchainDirectory)\ant\.stamp-%(Identity)')" Condition=" '%(AntItem.HostOS)' == '$(HostOS)' Or '%(AntItem.HostOS)' == '' " />
+        <_SdkStampFiles Include="@(_PlatformAndroidSdkItem->'$(AndroidToolchainDirectory)\sdk\.stamp-%(Identity)')" />
+    </ItemGroup>
+    <ItemGroup>
+      <_SdkStampFiles Include="@(_PlatformAntItem->'$(AntDirectory)\.stamp-%(Identity)')" />
+    </ItemGroup>
+    <ItemGroup>
+      <_DownloadedItem Include="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')" />
+      <_DownloadedItem Include="@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')" />
+      <_DownloadedItem Include="@(_PlatformAntItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')" />
     </ItemGroup>
   </Target>
-  <Target Name="_CreateAndroidToolchains"
-      DependsOnTargets="_PrepareAndroidToolchainItems"
-      Outputs="@(_AndroidSdkStampFiles);@(_AndroidNdkStampFiles);@(_AntStampFiles)">
-    <Exec
-        Command="make $(MakeConcurrency) provision-android DISABLE_IOS=1 ANDROID_TOOLCHAIN_DIR=&quot;$(AndroidToolchainDirectory)&quot; ANDROID_TOOLCHAIN_CACHE_DIR=&quot;$(AndroidToolchainCacheDirectory)&quot; ANDROID_TOOLCHAIN_PREFIX=&quot;$(AndroidToolchainDirectory)\toolchains&quot; ANDROID_BUILD_TOOLS_VERSION=&quot;$(XABuildToolsVersion)&quot; ANDROID_BUILD_TOOLS_DIR=&quot;$(XABuildToolsFolder)&quot; ANDROID_PLATFORM_TOOLS=&quot;$(XAPlatformToolsVersion)&quot;"
-        WorkingDirectory="$(MonoSourceFullPath)\sdks\builds"
+  <Target Name="_DownloadItems"
+      DependsOnTargets="_DetermineItems"
+      Outputs="@(_DownloadedItem)">
+    <MakeDir Directories="$(AndroidToolchainCacheDirectory)" />
+    <DownloadUri
+        SourceUris="@(_PlatformAndroidSdkItem->'$(AndroidUri)/%(RelUrl)%(Identity).zip');@(_PlatformAndroidNdkItem->'$(AndroidUri)/%(RelUrl)%(Identity).zip')"
+        DestinationFiles="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip');@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
+    />
+    <DownloadUri
+        SourceUris="@(_PlatformAntItem->'$(AntUri)/%(RelUrl)%(Identity).zip')"
+        DestinationFiles="@(_PlatformAntItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
+    />
+  </Target>
+  <Target Name="_UnzipFiles"
+      DependsOnTargets="_DetermineItems"
+      Inputs="@(_DownloadedItem)"
+      Outputs="@(_SdkStampFiles);$(AndroidToolchainDirectory)\ndk\.stamp-ndk">
+    <CreateItem
+        Include="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(_PlatformAndroidSdkItem.Identity).zip'">
+      <Output TaskParameter="Include" ItemName="_AndroidSdkItems"/>
+    </CreateItem>
+    <CreateItem
+        Include="@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(_PlatformAndroidNdkItem.Identity).zip'"
+        Condition=" '%(HostOS)' == '$(HostOS)' Or '%(HostOS)' == '' ">
+      <Output TaskParameter="Include" ItemName="_AndroidNdkItems"/>
+    </CreateItem>
+
+    <RemoveDir Directories="$(AndroidSdkDirectory);$(AndroidNdkDirectory);$(AntDirectory)" />
+    <MakeDir Directories="$(AndroidSdkDirectory);$(AndroidNdkDirectory);$(AntDirectory)" />
+
+    <UnzipDirectoryChildren
+        HostOS="$(HostOS)"
+        NoSubdirectory="%(_PlatformAndroidSdkItem.NoSubdirectory)"
+        SourceFiles="@(_PlatformAndroidSdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
+        DestinationFolder="$(AndroidToolchainDirectory)\sdk"
+    />
+    <UnzipDirectoryChildren
+        HostOS="$(HostOS)"
+        NoSubdirectory="%(_PlatformAndroidSdkItem.NoSubdirectory)"
+        SourceFiles="@(_PlatformAndroidNdkItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
+        DestinationFolder="$(AndroidToolchainDirectory)\ndk"
+    />
+    <UnzipDirectoryChildren
+        HostOS="$(HostOS)"
+        NoSubdirectory="%(_PlatformAndroidSdkItem.NoSubdirectory)"
+        SourceFiles="@(_PlatformAntItem->'$(AndroidToolchainCacheDirectory)\%(Identity).zip')"
+        DestinationFolder="$(AntDirectory)"
+    />
+    <Touch
+        Files="@(_SdkStampFiles);$(AndroidToolchainDirectory)\ndk\.stamp-ndk"
+        AlwaysCreate="True"
     />
   </Target>
   <Target Name="_AcceptAndroidSdkLicenses">
     <AcceptAndroidSdkLicenses AndroidSdkDirectory="$(AndroidSdkDirectory)" JavaSdkDirectory="$(JavaSdkDirectory)" />
   </Target>
   <Target Name="_CreateMxeToolchains"
-      Condition=" '$(NeedMxe)' == 'true' And ($(AndroidSupportedHostJitAbisForConditionalChecks.Contains (':mxe-Win32:')) Or $(AndroidSupportedHostJitAbisForConditionalChecks.Contains (':mxe-Win64:')))"
+      Condition=" '$(HostOS)' != 'Windows' And '$(NeedMxe)' == 'true' And ($(AndroidSupportedHostJitAbisForConditionalChecks.Contains (':mxe-Win32:')) Or $(AndroidSupportedHostJitAbisForConditionalChecks.Contains (':mxe-Win64:')))"
       Outputs="$(AndroidMxeFullPath)\.stamp">
     <GitCommitHash
         WorkingDirectory="..\..\external\mxe"
diff --git a/build-tools/scripts/TestApks.targets b/build-tools/scripts/TestApks.targets
index 30e99373f77..983334e06ac 100644
--- a/build-tools/scripts/TestApks.targets
+++ b/build-tools/scripts/TestApks.targets
@@ -32,10 +32,12 @@
         AndroidAbi="x86"
         AndroidSdkHome="$(AndroidSdkDirectory)"
         JavaSdkHome="$(JavaSdkDirectory)"
-        SdkVersion="21"
+        SdkVersion="28"
         ImageName="$(_TestImageName)"
         ToolExe="$(AvdManagerToolExe)"
         ToolPath="$(AndroidToolsBinPath)"
+        RamSizeMB="2048"
+        DataPartitionSizeMB="2048"
     />
     <StartAndroidEmulator
         Condition=" '$(_ValidAdbTarget)' != 'True' "
diff --git a/src/mono-runtimes/mono-runtimes.targets b/src/mono-runtimes/mono-runtimes.targets
index 605e9a4c560..4eee8933411 100644
--- a/src/mono-runtimes/mono-runtimes.targets
+++ b/src/mono-runtimes/mono-runtimes.targets
@@ -40,13 +40,11 @@
     <_MonoSdksAndroidToolchainDir>$(AndroidToolchainDirectory)</_MonoSdksAndroidToolchainDir>
     <_MonoSdksAndroidToolchainCacheDir>$(AndroidToolchainCacheDirectory)</_MonoSdksAndroidToolchainCacheDir>
     <_MonoSdksAndroidToolchainPrefix>$(AndroidToolchainDirectory)\toolchains</_MonoSdksAndroidToolchainPrefix>
-    <_MonoSdksAndroidBuildToolsVersion>$(XABuildToolsVersion)</_MonoSdksAndroidBuildToolsVersion>
-    <_MonoSdksAndroidBuildToolsDir>$(XABuildToolsFolder)</_MonoSdksAndroidBuildToolsDir>
     <_MonoSdksLlvmSrc>$(MSBuildThisFileDirectory)..\..\external\llvm</_MonoSdksLlvmSrc>
     <_MonoSdksMxePrefixDir>$(AndroidToolchainDirectory)</_MonoSdksMxePrefixDir>
     <_MonoSdksMxeSrc>$(MSBuildThisFileDirectory)..\..\external\mxe</_MonoSdksMxeSrc>
 
-    <_MonoSdksParameters>CONFIGURATION=$(_MonoSdksConfiguration) IGNORE_PROVISION_MXE=true IGNORE_PROVISION_ANDROID=true IGNORE_PACKAGE_LLVM=true ANDROID_TOOLCHAIN_DIR=&quot;$(_MonoSdksAndroidToolchainDir)&quot; ANDROID_TOOLCHAIN_CACHE_DIR=&quot;$(_MonoSdksAndroidToolchainCacheDir)&quot; ANDROID_TOOLCHAIN_PREFIX=&quot;$(_MonoSdksAndroidToolchainPrefix)&quot; ANDROID_BUILD_TOOLS_VERSION=&quot;$(_MonoSdksAndroidBuildToolsVersion)&quot; ANDROID_BUILD_TOOLS_DIR=&quot;$(_MonoSdksAndroidBuildToolsDir)&quot; LLVM_SRC=&quot;$(_MonoSdksLlvmSrc)&quot; MXE_PREFIX_DIR=&quot;$(_MonoSdksMxePrefixDir)&quot; MXE_SRC=&quot;$(_MonoSdksMxeSrc)&quot;</_MonoSdksParameters>
+    <_MonoSdksParameters>CONFIGURATION=$(_MonoSdksConfiguration) IGNORE_PROVISION_MXE=true IGNORE_PROVISION_ANDROID=true IGNORE_PACKAGE_LLVM=true ANDROID_TOOLCHAIN_DIR=&quot;$(_MonoSdksAndroidToolchainDir)&quot; ANDROID_TOOLCHAIN_CACHE_DIR=&quot;$(_MonoSdksAndroidToolchainCacheDir)&quot; ANDROID_TOOLCHAIN_PREFIX=&quot;$(_MonoSdksAndroidToolchainPrefix)&quot; LLVM_SRC=&quot;$(_MonoSdksLlvmSrc)&quot; MXE_PREFIX_DIR=&quot;$(_MonoSdksMxePrefixDir)&quot; MXE_SRC=&quot;$(_MonoSdksMxeSrc)&quot;</_MonoSdksParameters>
   </PropertyGroup>
   <PropertyGroup>
     <ForceBuildDependsOn>