error while adding multiple proguard directory in release type

[TheReprator]

FileCollection proGuardFileCollection = files { file('./cproguardfiles').listFiles() }
proguardFiles(proGuardFileCollection)

Folder name is: cproguardfiles(in project structure )

Error:(23, 0) Cannot convert the provided notation to a File or URI: file collection.
The following types/formats are supported:

• A String or CharSequence path, for example 'src/main/java' or '/usr/include'.
• A String or CharSequence URI, for example 'file:/usr/include'.
• A File instance.
• A URI or URL instance.

This is

[jdulaney]

switch it to

proguardFiles fileTree(dir: "cproguardfiles", include: ["*.pro"]).asList().toArray()

[TheReprator]

thanks it worked.

[TheReprator]

although the error is removed but it didn't accept the proguard files added, here is the screenshot of the error

here is the error along with screenshot,
Warning:com.fasterxml.jackson.databind.ext.PathDeserializer: can't find referenced class java.nio.file.Path
Warning:com.fasterxml.jackson.databind.ext.DOMSerializer: can't find referenced class org.w3c.dom.bootstrap.DOMImplementationRegistry
Warning:com.fasterxml.jackson.databind.ext.PathDeserializer: can't find referenced class java.nio.file.Paths
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.Transient
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.Transient
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.ConstructorProperties
Warning:com.fasterxml.jackson.databind.ext.PathDeserializer: can't find referenced class java.nio.file.Path
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.ConstructorProperties
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.Transient
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.ConstructorProperties
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.Transient
Warning:com.fasterxml.jackson.databind.introspect.JacksonAnnotationIntrospector$Java7Support: can't find referenced class java.beans.ConstructorProperties
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 41 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:transformClassesAndResourcesWithProguardForClientDebug'.

java.io.IOException: Please correct the above warnings first.

[sauravexodus]

Include these in your proguard-rules.pro

-dontwarn com.fasterxml.**
-dontwarn okio.**
-dontwarn retrofit2.**

[TheReprator]

if i add these lines in proguard-rules.pro, then "{ file('./cproguardfiles').listFiles() }" will be useless, your as well as mine efforts will go in vein.

[sauravexodus]

I don't understand. Can you provide any reference?

What I read about -dontwarn is they are only used to ignore warnings while building. So if you know that some unreferenced class won't create a mess in your project then its totally okay to use these.

http://proguard.sourceforge.net/manual/usage.html

[enginebai]

I had the same problem as well.

android {
    ....
    buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            FileCollection proguardFileCollection = files { file('./proguard').listFiles() }
            proguardFiles(proguardFileCollection)
        }
    }
}

It seem

[TheReprator]

please add this "proguardFiles fileTree(dir: "proguard", include: ["*.pro"]).asList().toArray()"

and remove these lines,
FileCollection proguardFileCollection = files { file('./proguard').listFiles() }
proguardFiles(proguardFileCollection)

[TheReprator]

@sauravexodus , means i include these then, what will be the advantage of adding your file as i have to write the code in my own proguard files.

[trevorwang]

https://code.google.com/p/android/issues/detail?id=212882

[chriscoderdr]

@TheGreat0004 line of code solved it for me