我使用Visual Studio 2019开发了Xamarin.Form。当我尝试在发布模式下构建应用程序时，我收到很多Progard警告，并且构建失败并出现错误MSB6006：“ java.exe”退出，代码为1。在网上检查以找到修复程序，然后我创建了一个ProgardConfiguration文件，如下所示：
# This is Xamarin-specific (and enhanced) configuration.
-keep class android.arch.persistence.room.paging.** { *; }
-keep class com.google.android.gms.** { *; }
-keep class com.google.firebase.** { *; }
-keep class android.arch.paging.** { *; }
-keepattributes Signature
-keep class com.firebase.** { *; }
-keep class org.apache.** { *; }
-dontwarn org.apache.**
-dontwarn org.w3c.dom.**
-dontwarn android.support.v4.**
-dontwarn com.google.android.gms.**
-dontwarn com.google.firebase.**
但是我无法解决这些问题。
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find superclass or interface android.arch.paging.PositionalDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced method 'int computeInitialLoadPosition(android.arch.paging.PositionalDataSource$LoadInitialParams,int)' in program class android.arch.persistence.room.paging.LimitOffsetDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced method 'int computeInitialLoadSize(android.arch.paging.PositionalDataSource$LoadInitialParams,int,int)' in program class android.arch.persistence.room.paging.LimitOffsetDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced method 'void invalidate()' in program class android.arch.persistence.room.paging.LimitOffsetDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadInitialCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeParams
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource$LoadRangeCallback
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource: can't find referenced class android.arch.paging.PositionalDataSource
1>PROGUARD : warning : android.arch.persistence.room.paging.LimitOffsetDataSource$1: can't find referenced method 'void invalidate()' in program class android.arch.persistence.room.paging.LimitOffsetDataSource
1>PROGUARD : warning : there were 27 unresolved references to classes or interfaces.
1>PROGUARD : warning : there were 4 unresolved references to program class members.
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Xamarin\Android\Xamarin.Android.D8.targets(49,5): error MSB6006: "java.exe" exited with code 1.
有人可以帮助我解决该问题吗？我从未在Visual Studio 2017中遇到过这个问题。