设置minifyEnabled后，无法生成签名APk

Question

我已将Warning:com.fasterxml.jackson.databind.ext.DOMSerializer: can't find referenced class org.w3c.dom.bootstrap.DOMImplementationRegistry Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement Warning:okio.Okio: can't find referenced class java.nio.file.Files Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class java.nio.file.Path Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement Warning:retrofit2.Platform$Java8: can't find referenced method 'boolean isDefault()' in library class java.lang.reflect.Method Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandles$Lookup Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandle Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandles Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandle Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandles$Lookup Warning:retrofit2.Platform$Java8: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement Warning:there were 27 unresolved references to classes or interfaces. Warning:there were 1 unresolved references to library class members. Warning:Exception while processing task java.io.IOException: Please correct the above warnings first. Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'. > Job failed, see logs for details 设为true，但之后我无法生成已签名的apk。

显示警告和错误：

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现在当我将minifyEnabled设置为false时，它将允许我生成已签名的apk但我想将其设置为true。

我怎样解决这个问题？

Answer 1

这是okio和proguard的问题。

关注this link以获取详细说明 但简而言之，您似乎需要将这些行添加到项目中的proguard-rules文件中。

-dontwarn okhttp3.**
-dontwarn okio.**

Answer 2

在proguard-rules文件中添加以下行：

-dontwarn okhttp3.**
-dontwarn okio.**
-dontwarn com.fasterxml.jackson.databind.**

Reference