如何在Xamarin.Forms适用于Android的应用程序中使用D8，R8?

本文介绍了如何在Xamarin.Forms适用于Android的应用程序中使用D8，R8?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我刚刚下载了Vs 2019 pre，它为xamarin android提供了更多配置，如这里

I have just downloaded Vs 2019 pre and it offers more configuration for xamarin android as stated here

建议按以下方式使用，并告知proguard不能与r8一起使用，因为它可以代替proguard.

It suggests to use as below and it tells that proguard cant be use together with r8 as it is replacement for proguard.

<Project>
    <PropertyGroup>
        <AndroidEnableMultiDex>True</AndroidEnableMultiDex>
        <AndroidDexTool>d8</AndroidDexTool>
        <AndroidLinkTool>r8</AndroidLinkTool>
    </PropertyGroup>
</Project>

但是我真的不明白r8应该如何工作?因为使用proguard，我已经做了很多配置，例如定义保留哪个库，类，函数.所以我们不需要这些吗?只需设置r8即可?我已经按照建议尝试，但出现错误8>R8 : error : Compilation can't be completed because some library classes are missing.

but I dont really understand how r8 supposed to work? because using proguard I have done a lot of configurations like defining which library, class, function keep. So we dont need any of those? simply set up r8 and go? I attempted already as suggested but i get error that 8>R8 : error : Compilation can't be completed because some library classes are missing.

此外，这些设置如何将效果捆绑到本机程序集，AotAssemblies，LLVM等中?我们可以和他们一起使用吗?我的配置如下.但不幸的是，它不起作用.如果我删除D8和R8，它的工作原理.我尝试仅使用Proguard + D8，但也无法正常工作.

Beside that how are those settings effect bundle into native assemblies, AotAssemblies, LLVM etc? can we use together with them. my configuration is as below. But unfortunately it doesnt work. if i remove D8 and R8 it works. I tried using Proguard+D8 only but also doesnt work.

<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <Optimize>true</Optimize>
    <OutputPath>bin\Release\</OutputPath>
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
    <AndroidUseSharedRuntime>False</AndroidUseSharedRuntime>
    <DebugType>portable</DebugType>
    <AndroidLinkMode>Full</AndroidLinkMode>
    <EmbedAssembliesIntoApk>true</EmbedAssembliesIntoApk>
    <AndroidCreatePackagePerAbi>true</AndroidCreatePackagePerAbi>
    <JavaMaximumHeapSize>1G</JavaMaximumHeapSize>
    <AotAssemblies>true</AotAssemblies>
    <EnableLLVM>true</EnableLLVM>
    <AndroidAotAdditionalArguments>no-write-symbols,nodebug</AndroidAotAdditionalArguments>
    <DebugSymbols>false</DebugSymbols>
    <BundleAssemblies>true</BundleAssemblies>
    <AndroidEnableMultiDex>True</AndroidEnableMultiDex>
    <EnableProguard>false</EnableProguard>
    <Debugger>Xamarin</Debugger>
    <AndroidSupportedAbis>armeabi-v7a;x86;x86_64</AndroidSupportedAbis>
    <AndroidLinkSkip> </AndroidLinkSkip>
    <AndroidEnableMultipleDex>true</AndroidEnableMultipleDex>
    <AndroidExplicitCrunch>true</AndroidExplicitCrunch>
    <AndroidDexTool>d8</AndroidDexTool>
    <AndroidLinkTool>r8</AndroidLinkTool>
  </PropertyGroup>

更新:

我删除了r8并启用了proguard.因为一般阅读后(不仅是xamarin)，r8还不如proguard成熟.所以我只让d8高于configuarion和EnableProguard = true.但是我收到有关r8的警告和错误

I removed r8 and enabled proguard. because after reading in general (not only xamarin) r8 is not as mature as proguard. so I let d8 only above configuarion and EnableProguard =true. But i get warning and errors regarding r8

8>"\myApp.Droid\myApp.Droid.csproj" (Rebuild;BuiltProjectOutputGroup;BuiltProjectOutputGroupDependencies;DebugSymbolsProjectOutputGroup;DebugSymbolsProjectOutputGroupDependencies;DocumentationProjectOutputGroup;DocumentationProjectOutputGroupDependencies;SatelliteDllsProjectOutputGroup;SatelliteDllsProjectOutputGroupDependencies;SGenFilesOutputGroup;SGenFilesOutputGroupDependencies target) (1) ->
8>(_CompileToDalvikWithD8 target) -> 
8>  R8 : warning : Missing class: com.amazon.device.messaging.ADMMessageReceiver
8>  R8 : warning : Missing class: com.google.android.gms.location.LocationListener
8>  R8 : warning : Missing class: com.amazon.device.messaging.ADMMessageHandlerBase
8>  R8 : warning : Missing class: com.amazon.device.iap.PurchasingListener
8>  R8 : warning : Missing class: org.apache.http.client.methods.HttpEntityEnclosingRequestBase
8>
8>
8>"\myApp.Droid\myApp.Droid.csproj" (Rebuild;BuiltProjectOutputGroup;BuiltProjectOutputGroupDependencies;DebugSymbolsProjectOutputGroup;DebugSymbolsProjectOutputGroupDependencies;DocumentationProjectOutputGroup;DocumentationProjectOutputGroupDependencies;SatelliteDllsProjectOutputGroup;SatelliteDllsProjectOutputGroupDependencies;SGenFilesOutputGroup;SGenFilesOutputGroupDependencies target) (1) ->
8>(_CompileToDalvikWithD8 target) -> 
8>  R8 : error : Compilation can't be completed because some library classes are missing.
8>
8>    45 Warning(s)
8>    1 Error(s)
8>

R8

如何在Xamarin.Forms适用于Android的应用程序中使用D8，R8?

问题描述

推荐答案