使用proguard创建已签名apk的错误

Question

我正在尝试使用proguard进行已签名的apk。发生 错误：

Warning: Exception while processing task java.io.IOException: Can not write [C: \ Android \ App \ Project \ app \ build \ intermediates \ transforms \ proguard \ release \ jars \ 3 \ 1f \ main.jar] (Can 'T read [C: \ users \ user \ .gradle \ caches \ modules-2 \ files-2.1 \ com.google.code.gson \ gson \ 2.7 \ 751f548c85fa49f330cecbb1875893f971b33c4e \ gson-2.7.jar (;;;;;; **. Class)] (Duplicate zip entry [com/google/a/a/a.class == gson-2.7.jar: com/google/gson/annotations/Expose.class])) 
Error: Execution failed for task ': app: transformClassesAndResourcesWithProguardForRelease'. 
Job failed, see logs for details 

的proguard-rules.pro文件I配置

-keepattributes Signature 
-keep class sun.misc.Unsafe { *; } 
-keep class com.exp.data.** { *; } 
-dontwarn com.google.common.** 
-dontwarn com.google.gson.** 
-dontwarn retrofit2.converter.gson.** 
-dontwarn retrofit2.Platform$Java8 
-dontwarn okio.** 
-dontwarn org.apache.commons.io.FilenameUtils 
-keep class okio.** 

为什么能发生一个错误？

我使用的build.gradle文件

apply plugin: 'com.android.application' 

android { 
    compileSdkVersion 25 
    buildToolsVersion '25.0.2' 
    defaultConfig { 
     applicationId "ru.vintegra.sale" 
     minSdkVersion 21 
     targetSdkVersion 25 
     versionCode 41 
     versionName '1.41' 
     multiDexEnabled true 
    } 
    dexOptions { 
     javaMaxHeapSize "4g" //specify the heap size for the dex process 
    } 
    buildTypes { 
     release { 
      minifyEnabled true 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 
        'proguard-rules.pro' 
     } 
    } 
}  
dependencies { 
    compile fileTree(include: ['*.jar'], dir: 'libs') 
    compile 'com.android.support:multidex:1.0.1' 
    compile 'com.android.support:appcompat-v7:25.3.1' 
    compile 'com.android.support:support-v4:25.3.1' 
    compile 'com.android.support:design:25.3.1' 
    compile 'com.android.support:support-v13:25.3.1' 
    compile 'com.microsoft.azure:azure-mobile-services-android-sdk:2.0.3' 
    compile 'com.google.android.gms:play-services-location:11.0.1' 
    compile 'com.google.android.gms:play-services-maps:11.0.1' 
    compile 'com.google.android.gms:play-services-vision:11.0.1' 
    compile 'com.squareup.retrofit2:retrofit:2.1.0' 
    compile 'com.squareup.retrofit2:converter-gson:2.1.0' 
    compile 'com.squareup.retrofit2:converter-scalars:2.1.0' 
    compile 'com.squareup.okhttp3:okhttp:3.4.2' 
} 

在我的项目只有一个文件proguard的-android.txt-2.3.3。

Answer 1

你可以试试这个片断：

########### OkHttp3 ########### 

-keepattributes Signature 

-keepattributes *Annotation* 

-keep,includedescriptorclasses class okhttp3.** { *; } 

-keep interface okhttp3.** { *; } 

-dontwarn okhttp3.** 

-dontnote okhttp3.** 

######### OkHttp3 end ######### 

########### OkHttp URL Connection ########### 

-keep class com.squareup.okhttp3.** { *; } 

-keep interface com.squareup.okhttp3.** { *; } 

-dontwarn com.squareup.okhttp3.** 

-dontnote com.squareup.okhttp3.** 

########### OkHttp URL Connection end ########### 

-keep class com.google.android.gms.** 

-keepclassmembers class com.google.android.gms.** { 
    *; 
} 

-keep class com.google.gson.** 

-keepclassmembers class com.google.gson.** { 
    *; 
}