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I am building an android app with proguard in Android Studio and my project has a library jar (na.jar) that I would like to skip obfuscation and preverification because some classes from the na.jar are giving me errors during the build. So in my proguard config file, I have the following options 

-dontpreverify 

# com.na, org.json are packages in na.jar, don't obfuscate the code in these packages
-keep class com.na.** { *; } 
-keep interface com.na.** { *; } 
-keep class org.json.** { *; } 
-keep interface org.json.** { *; }

However I am still getting the following errors related to the faulty classes in na.jar during the build process.

Caused by: java.io.IOException: Can't read [C:\StudioProjects\PBActivity\pBActivity\libs\na.jar(;;;;;;!META-INF/MANIFEST.MF)] (Can't process class [com/na/util/BinConverter.class] (256))
    at proguard.InputReader.readInput(InputReader.java:188)
    at proguard.InputReader.readInput(InputReader.java:158)
    at proguard.InputReader.readInput(InputReader.java:136)
    at proguard.InputReader.execute(InputReader.java:66)
    at proguard.ProGuard.readInput(ProGuard.java:207)
    at proguard.ProGuard.execute(ProGuard.java:81)
    at proguard.gradle.ProGuardTask.proguard(ProGuardTask.java:1074)
    at com.android.build.gradle.tasks.AndroidProGuardTask.proguard(AndroidProGuardTask.java:87)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
    ... 62 more
Caused by: java.io.IOException: Can't process class [com/na/util/BinConverter.class] (256)
    at proguard.io.ClassReader.read(ClassReader.java:112)
    at proguard.io.FilteredDataEntryReader.read(FilteredDataEntryReader.java:87)
    at proguard.io.FilteredDataEntryReader.read(FilteredDataEntryReader.java:87)
    at proguard.io.FilteredDataEntryReader.read(FilteredDataEntryReader.java:87)
    at proguard.io.JarReader.read(JarReader.java:65)
    at proguard.io.DirectoryPump.readFiles(DirectoryPump.java:65)
    at proguard.io.DirectoryPump.pumpDataEntries(DirectoryPump.java:53)
    at proguard.InputReader.readInput(InputReader.java:184)
   ... 70 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 256
    at proguard.classfile.ProgramClass.getString(ProgramClass.java:116)
    at proguard.classfile.io.ProgramClassReader.createAttribute(ProgramClassReader.java:990)
    at proguard.classfile.io.ProgramClassReader.visitProgramMethod(ProgramClassReader.java:206)
    at proguard.classfile.io.ProgramClassReader.visitProgramClass(ProgramClassReader.java:149)
    at proguard.classfile.ProgramClass.accept(ProgramClass.java:358)
    at proguard.io.ClassReader.read(ClassReader.java:91)
    ... 77 more

So does proguard still reads the classes and jars even with obfuscation skipped ? I am new to using proguard to build android apps.

Update #1

-dontpreverify
-dontoptimize
-dontshrink

-keep class com.na.** { *; }
-keep interface com.na.** { *; }
-keep class org.json.** { *; }
-keep interface org.json.** { *; }
ROMANIA_engineer
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Nicky
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  • Yes, obfuscation is only one part of what ProGuard does - it will continue to do the remaining parts to the library such as removing unused code etc. – Owais Ali Jan 04 '16 at 04:50
  • Is it possible for Proguard to skip reading/processing the library jars (na.jar) then ? – Nicky Jan 04 '16 at 04:55
  • You can disable optimization by adding a filter using: -optimizations (specify regex preceded by a ! to indicate these types/packages should not be optimized). I'm guessing this list will be the same as your "keep" list. – Owais Ali Jan 04 '16 at 05:06
  • see this link its help more : http://proguard.sourceforge.net/manual/examples.html – Saif Jan 04 '16 at 05:39
  • I only need to obfuscate my code except for the library jars (na.jar). So I added -dontoptimize and -dontshrink to my config file. However, the above error persist during the build. – Nicky Jan 04 '16 at 09:30
  • Can you post what your ProGuard config looks like now? – Owais Ali Jan 04 '16 at 17:20
  • Please refer to Update #1 in original post for my current config file. Thanks. – Nicky Jan 05 '16 at 02:06
  • Do you have access to who built the library? I'm struggling with the same and I'll try to see if I can get a new version of the jar. It seems like it is packaged in a way that ProGuard really does not like. The best would be to find a configuration that lets proguard skip processing of the file, but I have not been successful. – havchr Aug 08 '16 at 07:53
  • did you check if the file is readable ? – Adliano Alves Aug 11 '16 at 05:53

2 Answers2

2

I have also issue with pro guard but i found following code from git hub more useful.

Build.grade

buildscript {
    repositories {
        mavenCentral()
        maven {
            url 'https://oss.sonatype.org/content/repositories/snapshots/'
        }
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.9.+'
        classpath 'com.squareup.gradle:gradle-android-test-plugin:0.9.1-SNAPSHOT'
    }
}
apply plugin: 'android'
apply plugin: 'android-test'

repositories {
    mavenCentral()
    maven {
        url 'https://oss.sonatype.org/content/repositories/snapshots/'
    }
}

android {
    compileSdkVersion 19
    buildToolsVersion "19.1.0"

    defaultConfig {
        minSdkVersion 9
        targetSdkVersion 19
    }

    signingConfigs {
        debug {
            storeFile file("debug.keystore")
        }

        release {
            storeFile file("project.keystore")
            storePassword "1234"
            keyAlias "Project"
            keyPassword "1234"
        }
    }

    buildTypes {
        release {
            debuggable false
            runProguard true
            signingConfig signingConfigs.release
            proguardFile getDefaultProguardFile('proguard-android-optimize.txt')
        }
    }

    productFlavors {
        defaultFlavor {
            proguardFile 'proguard-rules.txt'
        }
    }

    sourceSets {
        main {
            java.srcDirs = ['src/main/java', 'src-gen/main/java']
        }
        instrumentTest.setRoot('src/test')
    }
}

dependencies {

    compile 'com.actionbarsherlock:actionbarsherlock:4.4.0@aar'
    compile 'com.android.support:support-v4:19.1.+'
    compile 'de.greenrobot:greendao:1.3.7'
    compile 'com.google.android.gms:play-services:4.4.52'

    testCompile 'junit:junit:4.10'
    testCompile 'org.robolectric:robolectric:2.1.+'
    testCompile 'com.squareup:fest-android:1.0.+'

    instrumentTestCompile 'junit:junit:4.10'
    instrumentTestCompile 'org.robolectric:robolectric:2.1.+'
    instrumentTestCompile 'com.squareup:fest-android:1.0.+'
}

task wrapper(type: Wrapper) {
    gradleVersion = '1.8'
}

pro guard-rules 

####################################################################################################
    ####################################################################################################
    ####################################################################################################
    ######################################### PROGUARD #################################################
    ####################################################################################################
    ####################################################################################################
    ####################################################################################################

    # This is a configuration file for ProGuard.
    # http://proguard.sourceforge.net/index.html#manual/usage.html
    -dontusemixedcaseclassnames
    -dontskipnonpubliclibraryclasses
    -verbose

    # Optimization is turned off by default. Dex does not like code run
    # through the ProGuard optimize and preverify steps (and performs some
    # of these optimizations on its own).
    #-dontoptimize
    #-dontpreverify

    # If you want to enable optimization, you should include the
    # following:
    -optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*
    -optimizationpasses 5
    -allowaccessmodification
    #
    # Note that you cannot just include these flags in your own
    # configuration file; if you are including this file, optimization
    # will be turned off. You'll need to either edit this file, or
    # duplicate the contents of this file and remove the include of this
    # file from your project's proguard.config path property.

    -keep public class * extends android.app.Activity
    -keep public class * extends android.app.Application
    -keep public class * extends android.app.Service
    -keep public class * extends android.content.BroadcastReceiver
    -keep public class * extends android.content.ContentProvider
    -keep public class * extends android.app.backup.BackupAgent
    -keep public class * extends android.preference.Preference
    -keep public class * extends android.support.v4.app.Fragment
    -keep public class * extends android.support.v4.app.DialogFragment
    -keep public class * extends com.actionbarsherlock.app.SherlockListFragment
    -keep public class * extends com.actionbarsherlock.app.SherlockFragment
    -keep public class * extends com.actionbarsherlock.app.SherlockFragmentActivity
    -keep public class * extends android.app.Fragment
    -keep public class com.android.vending.licensing.ILicensingService

    # For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
    -keepclasseswithmembernames class * {
     native <methods>;
    }

    -keep public class * extends android.view.View {
     public <init>(android.content.Context);
     public <init>(android.content.Context, android.util.AttributeSet);
     public <init>(android.content.Context, android.util.AttributeSet, int);
     public void set*(...);
    }

    -keepclasseswithmembers class * {
     public <init>(android.content.Context, android.util.AttributeSet);
    }

    -keepclasseswithmembers class * {
     public <init>(android.content.Context, android.util.AttributeSet, int);
    }

    -keepclassmembers class * extends android.app.Activity {
     public void *(android.view.View);
    }

    # For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
    -keepclassmembers enum * {
     public static **[] values();
     public static ** valueOf(java.lang.String);
    }

    -keep class * implements android.os.Parcelable {
     public static final android.os.Parcelable$Creator *;
    }

    -keepclassmembers class **.R$* {
     public static <fields>;
    }

    -keep class android.support.v4.app.** { *; }
    -keep interface android.support.v4.app.** { *; }
    -keep class com.actionbarsherlock.** { *; }
    -keep interface com.actionbarsherlock.** { *; }
    # The support library contains references to newer platform versions.
    # Don't warn about those in case this app is linking against an older
    # platform version. We know about them, and they are safe.
    -dontwarn android.support.**
    -dontwarn com.google.ads.**
0

try this:

-dontwarn com.na.**
-keep class com.na.** { *; }
-keepattributes Signature
-keepattributes Exceptions
masoud vali
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  • This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post. - [From Review](/review/low-quality-posts/14187008) – Eli Sadoff Nov 05 '16 at 00:10
  • he wanted to skip the jar file classes, so i put this code to help him not to critique him @EliSadoff – masoud vali Nov 05 '16 at 05:21