Android签名APK生成:未找到引用类/方法的Proguard异常

Question

我需要为Play商店生成已签名的APK.(使用Android Studio)如果我没有proguard(build.gradle中的minifyEnabled false)那么一切正常!

如果我使用默认参数激活它:

buildTypes {
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

我收到这些警告

:app:proguardRelease
Warning: com.android.volley.error.VolleyErrorHelper$1: can't find superclass or interface com.google.gson.reflect.TypeToken
Warning: com.android.volley.error.VolleyErrorHelper: can't find referenced class com.google.gson.Gson
Warning: com.android.volley.error.VolleyErrorHelper: can't find referenced class com.google.gson.Gson
Warning: com.android.volley.error.VolleyErrorHelper: can't find referenced method 'java.lang.reflect.Type getType()' in program class com.android.volley.error.VolleyErrorHelper$1
Warning: com.android.volley.error.VolleyErrorHelper: can't find referenced class com.google.gson.Gson
Warning: com.android.volley.error.VolleyErrorHelper$1: can't find referenced class com.google.gson.reflect.TypeToken
Warning: com.android.volley.error.VolleyErrorHelper$1: can't find referenced class com.google.gson.reflect.TypeToken
Warning: com.android.volley.error.VolleyErrorHelper$1: can't find referenced class com.google.gson.reflect.TypeToken
Warning: com.android.volley.request.GsonRequest: can't find referenced class com.google.gson.Gson
Warning: com.android.volley.request.GsonRequest: can't find referenced class com.google.gson.Gson
Warning: com.android.volley.request.GsonRequest: can't find referenced class com.google.gson.Gson
Warning: com.android.volley.request.GsonRequest: can't find referenced class com.google.gson.JsonSyntaxException
Warning: com.android.volley.request.GsonRequest: can't find referenced class com.google.gson.JsonSyntaxException
Warning: com.android.volley.request.GsonRequest: can't find referenced class com.google.gson.Gson
Warning: com.android.volley.request.GsonRequest: can't find referenced class com.google.gson.JsonSyntaxException
Warning: com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl: can't find referenced method 'long getContentLengthLong()' in program class com.squareup.okhttp.internal.huc.HttpURLConnectionImpl
Warning: com.squareup.okhttp.internal.huc.HttpsURLConnectionImpl: can't find referenced method 'long getHeaderFieldLong(java.lang.String,long)' in program class com.squareup.okhttp.internal.huc.HttpURLConnectionImpl
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.Files
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 28 unresolved references to classes or interfaces.
         You may need to add missing library jars or update their versions.
         If your code works fine without the missing classes, you can suppress
         the warnings with '-dontwarn' options.
         (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
Warning: there were 3 unresolved references to program class members.
         Your input classes appear to be inconsistent.
         You may need to recompile the code.
         (http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedprogramclassmember)
Exception while processing task 
java.io.IOException: Please correct the above warnings first.
    at proguard.Initializer.execute(Initializer.java:473)
    at proguard.ProGuard.initialize(ProGuard.java:233)
    at proguard.ProGuard.execute(ProGuard.java:98)
    at proguard.gradle.ProGuardTask.proguard(ProGuardTask.java:1074)
    at com.android.build.gradle.tasks.AndroidProGuardTask.doMinification(AndroidProGuardTask.java:137)
    at com.android.build.gradle.tasks.AndroidProGuardTask$1.run(AndroidProGuardTask.java:113)
    at com.android.builder.tasks.Job.runTask(Job.java:48)
    at com.android.build.gradle.tasks.SimpleWorkQueue$EmptyThreadContext.runTask(SimpleWorkQueue.java:41)
    at com.android.builder.tasks.WorkQueue.run(WorkQueue.java:227)
    at java.lang.Thread.run(Thread.java:745)
:app:dexRelease UP-TO-DATE
:app:validateExternalOverrideSigning
:app:packageRelease

并且构建过程停止并显示以下消息:

Error:Execution failed for task ':app:packageRelease'.
> Unable to compute hash of ...\app\build\intermediates\classes-proguard\release\classes.jar

经过几次尝试后,我找到了一种方法来删除我在"proguard-rules.pro"中使用这些行的警告:

-dontwarn com.android.volley.**
-dontwarn com.squareup.okhttp.**
-dontwarn okio.**

但构建过程仍然出错!任何人都有解决此问题的方法？

谢谢!达维德

Answer 1

经过几次尝试......这里解决方案:

首先按照Raymond的建议配置dontwarn(也许这不是必需的,但我离开了它):

-dontwarn com.google.gson.**
-dontwarn java.nio.file.**
-dontwarn org.codehaus.mojo.animal_sniffer.**
-dontwarn com.squareup.okhttp.internal.huc.**
-dontwarn com.android.volley.error.**

然后配置Proguard跳过我的库:

-keep class com.android.volley.error.** { *; }
-keep class com.squareup.okhttp.internal.huc.** { *; }
-keep class okio.** { *; }

另外,编译还可以,但在运行时应用程序崩溃了.所以,为了避免这个问题,我添加了这些行:

-keep class android.support.design.widget.** { *; }
-keep interface android.support.design.widget.** { *; }
-dontwarn android.support.design.**

根据从这个主题中找到的一些信息:

java.lang.RuntimeException:无法使行为子类膨胀

通过此设置,我可以生成我的应用程序的签名APK.

Answer 2

您必须dontwarn改为申请引用的类。

例如：

-dontwarn com.google.gson.**
-dontwarn java.nio.file.**