android代码混淆Warning:okio.DeflaterSink: can't find referenced class

Android studio 代码混淆遇到的两个问题

找不到app/build/intermediates/proguard-rules/release/aapt_rules.txt文件

解决方法:Build->clean Project->Make Project

Information:Gradle tasks [:app:assembleRelease]

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:there were 14 unresolved references to classes or interfaces.

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

解决办法:在proguard-rule.pro文件下加一句 -dontwarn okio.**