在 proguard-rules.pro 中添加包名称后，在运行 R8 时检测到 Proguard Missing classes

Question

AGPBI 将其作为输出：

> Task :app:minifyReleaseWithR8
AGPBI: {"kind":"warning","text":"Unexpected reference to missing service class: META-INF/services/reactor.blockhound.integration.BlockHoundIntegration.","sources":[{"file":"/app/build/intermediates/merged_java_res/release/base.jar"}],"tool":"R8"}

AGPBI: {"kind":"warning","text":"Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /app/build/outputs/mapping/release/missing_rules.txt.\n","sources":[{}]}

AGPBI: {"kind":"warning","text":"Missing class com.aayushatharva.brotli4j.Brotli4jLoader (referenced from: void io.netty.handler.codec.compression.Brotli.<clinit>() and 2 other contexts)\n

Missing class com.aayushatharva.brotli4j.decoder.DecoderJNI$Status (referenced from: void io.netty.handler.codec.compression.BrotliDecoder$1.<clinit>() and 1 other context)\n
Missing class com.aayushatharva.brotli4j.decoder.DecoderJNI$Wrapper (referenced from: com.aayushatharva.brotli4j.decoder.DecoderJNI$Wrapper io.netty.handler.codec.compression.BrotliDecoder.decoder and 4 other contexts)\n
Missing class com.aayushatharva.brotli4j.encoder.Encoder$Mode (referenced from: void io.netty.handler.codec.compression.BrotliOptions.<clinit>())\n
Missing class com.aayushatharva.brotli4j.encoder.Encoder$Parameters (referenced from: com.aayushatharva.brotli4j.encoder.Encoder$Parameters io.netty.handler.codec.compression.BrotliEncoder.parameters and 7 other contexts)\n
Missing class com.aayushatharva.brotli4j.encoder.Encoder (referenced from: io.netty.buffer.ByteBuf io.netty.handler.codec.compression.BrotliEncoder.allocateBuffer(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, boolean))\n
Missing class com.android.org.conscrypt.SSLParametersImpl (referenced from: void org.conscrypt.KitKatPlatformOpenSSLSocketImplAdapter.<init>(org.conscrypt.AbstractConscryptSocket))\n
Missing class com.github.luben.zstd.Zstd (referenced from: io.netty.buffer.ByteBuf io.netty.handler.codec.compression.ZstdEncoder.allocateBuffer(io.netty.channel.ChannelHandlerContext, io.netty.buffer.ByteBuf, boolean) and 1 other context)\n
Missing class com.google.protobuf.ExtensionRegistry (referenced from: void io.netty.handler.codec.protobuf.ProtobufDecoder.<init>(com.google.protobuf.MessageLite, com.google.protobuf.ExtensionRegistry))\n
Missing class com.google.protobuf.ExtensionRegistryLite (referenced from: com.google.protobuf.ExtensionRegistryLite io.netty.handler.codec.protobuf.ProtobufDecoder.extensionRegistry and 2 other contexts)\n

丢失的文件似乎是bouncycastle 库的一部分。这是我的proguard 文件：

-keep class org.spongycastle.** { *; }
-dontwarn org.spongycastle.**

# When I remove this, java.security.cert.CertificateException: X.509 not found is thrown
-keep class org.bouncycastle.** { *; }
-keep interface org.bouncycastle.**

# I got the missing classes from missing_rules.txt and added the package names that created the problem here:
-keep class org.conscrypt.** { *; }
-keep class io.netty.** { *; }

-keep class com.aayushatharva.** { *; }

-keep class ** { *; }

build.gradle（应用程序）：

implementation "org.conscrypt:conscrypt-android:$conscrypt"
implementation 'org.bouncycastle:bcprov-jdk15on:1.69'
implementation 'org.bouncycastle:bcpkix-jdk15on:1.69'

为什么在我添加正确的缺少的包名称时它仍然给出错误？

Answer 1

缺少的类警告表明所提到的类不存在于输入（您的源代码和依赖项）或引用的库中（在这种情况下，Android 运行时库android.jar 由 Platfrom SDK 提供）。当 R8 跟踪程序时，它将尝试处理它在它认为是活动的程序部分中找到的所有类、方法和字段。将所有类保存在一个包中不会改变这一点。在这种情况下有两种选择：

1. 找到缺失的依赖并添加到项目中
2. 使用-dontwarn 忽略警告，因为该类预计会丢失。

对于com.android.org.conscrypt.SSLParametersImpl类的警告添加一个

-dontwarn com.android.org.conscrypt.SSLParametersImpl`

是正确的做法，因为查看source 表明该类扩展了一个将在 KitKat 运行时中的类，但不在应用程序中（也不在 android.jar 中）。

对于剩余的警告，必须做出类似的决定。