Android ProGuard + MultiDex导致ClassNotFoundException [英] Android ProGuard +MultiDex causes ClassNotFoundException

问题描述

我在我的android项目中启用了MultiDex.在我尝试启用proguard之前，它一直运行良好.我可以成功构建项目，但是启动时会出现运行时异常.无法找到Application类和MainActivity.在启用MultiDex之前，我遇到了同样的问题.现在，我猜测由于某些原因MultiDex无法与ProGuard一起正常工作.这是我在logcat中得到的-

I have MultiDex enabled in my android project. It was working fine until I tried enabling proguard. I can successfully build the project but I get runtime exception on startup. It's unable to find the Application class and the MainActivity. I had the same problem before enabling MultiDex. Now I guess for some reason the MultiDex is not working properly with ProGuard. Here is what i get in the logcat -

02-17 19:01:09.749: I/MultiDex(2079): VM with version 2.1.0 has multidex support
02-17 19:01:09.749: I/MultiDex(2079): install
02-17 19:01:09.749: I/MultiDex(2079): VM has multidex support, MultiDex support library is disabled.
02-17 19:01:09.750: I/art(2079): Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.app.FragmentActivity>
02-17 19:01:09.750: I/art(2079): Rejecting re-init on previously-failed class java.lang.Class<android.support.v4.app.FragmentActivity>
02-17 19:01:09.751: I/art(2079): Rejecting re-init on previously-failed class java.lang.Class<mypackage.activities.MainActivity>
02-17 19:01:09.751: I/art(2079): Rejecting re-init on previously-failed class java.lang.Class<mypackage.activities.MainActivity>
02-17 19:01:09.751: D/AndroidRuntime(2079): Shutting down VM
02-17 19:01:09.751: D/AndroidRuntime(2079): --------- beginning of crash 

，然后，其余的堆栈跟踪都与MainActivity的ClassNotFoundException有关:

and after that the rest of the stack trace is about ClassNotFoundException for the MainActivity:

02-17 19:01:09.752: E/AndroidRuntime(2079): FATAL EXCEPTION: main
02-17 19:01:09.752: E/AndroidRuntime(2079): Process: com.mypackage, PID: 2079
02-17 19:01:09.752: E/AndroidRuntime(2079): java.lang.NoClassDefFoundError: Failed resolution of: Lcom/mypackage/activities/MainActivity;
02-17 19:01:09.752: E/AndroidRuntime(2079):     at cmypackage.application.ApplicationContextProvider.onCreate(Unknown Source)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1011)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4518)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at android.app.ActivityThread.access$1500(ActivityThread.java:144)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1339)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at android.os.Handler.dispatchMessage(Handler.java:102)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at android.os.Looper.loop(Looper.java:135)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at android.app.ActivityThread.main(ActivityThread.java:5221)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at java.lang.reflect.Method.invoke(Native Method)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at java.lang.reflect.Method.invoke(Method.java:372)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
02-17 19:01:09.752: E/AndroidRuntime(2079): Caused by: java.lang.ClassNotFoundException: Didn't find class "mypackage.activities.MainActivity" on path: DexPathList[[zip file "/data/app/mypackage-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
02-17 19:01:09.752: E/AndroidRuntime(2079):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
02-17 19:01:09.752: E/AndroidRuntime(2079):     at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
02-17 19:01:09.752: E/AndroidRuntime(2079):     ... 12 more
02-17 19:01:09.752: E/AndroidRuntime(2079):     Suppressed: java.lang.NoClassDefFoundError: mypackage.activities.MainActivity
02-17 19:01:09.752: E/AndroidRuntime(2079):         at dalvik.system.DexFile.defineClassNative(Native Method)
02-17 19:01:09.752: E/AndroidRuntime(2079):         at dalvik.system.DexFile.defineClass(DexFile.java:226)
02-17 19:01:09.752: E/AndroidRuntime(2079):         at dalvik.system.DexFile.loadClassBinaryName(DexFile.java:219)
02-17 19:01:09.752: E/AndroidRuntime(2079):         at dalvik.system.DexPathList.findClass(DexPathList.java:321)
02-17 19:01:09.752: E/AndroidRuntime(2079):         at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:54)
02-17 19:01:09.752: E/AndroidRuntime(2079):         ... 14 more
02-17 19:01:09.752: E/AndroidRuntime(2079):     Suppressed: java.lang.ClassNotFoundException: mypackage.MainActivity
02-17 19:01:09.752: E/AndroidRuntime(2079):         at java.lang.Class.classForName(Native Method)
02-17 19:01:09.752: E/AndroidRuntime(2079):         at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
02-17 19:01:09.752: E/AndroidRuntime(2079):         at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
02-17 19:01:09.752: E/AndroidRuntime(2079):         at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
02-17 19:01:09.752: E/AndroidRuntime(2079):         ... 13 more
02-17 19:01:09.752: E/AndroidRuntime(2079):     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available

编辑- 这是我的proguard规则文件:

Edit- Here is my proguard rules file:

-libraryjars libs

# We only want obfuscation
-keepattributes InnerClasses,Signature

-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-dontoptimize
-verbose

# Sdk
-keep public interface com.zendesk.sdk.** { *; }
-keep public class com.zendesk.sdk.** { *; }

# Appcompat and support
#-keep interface android.support.v7.** { *; }
#-keep class android.support.v7.** { *; }
#-keep interface android.support.v4.** { *; }
#-keep class android.support.v4.** { *; }

# Gson
-keep interface com.google.gson.** { *; }
-keep class com.google.gson.** { *; }

# Retrofit
#-keep class com.google.inject.** { *; }
#-keep class org.apache.http.** { *; }
#-keep class org.apache.james.mime4j.** { *; }
#-keep class javax.inject.** { *; }
#-keep class retrofit.** { *; }
#-keep interface retrofit.** { *; }

# Retrofit
-keep class com.squareup.okhttp.** { *; }
-keep interface com.squareup.okhttp.** { *; }
-dontwarn com.squareup.okhttp.**

-dontwarn rx.**
-dontwarn retrofit.**
-dontwarn okio.**
-keep class retrofit.** { *; }
-keepclasseswithmembers class * {
    @retrofit.http.* <methods>;
}

# Jackson
-keepattributes *Annotation*,EnclosingMethod,Signature
-keepnames class com.fasterxml.jackson.** { *; }
 -dontwarn com.fasterxml.jackson.databind.**
 -keep class org.codehaus.** { *; }
 -keepclassmembers public final enum org.codehaus.jackson.annotate.JsonAutoDetect$Visibility {
 public static final org.codehaus.jackson.annotate.JsonAutoDetect$Visibility *; }
-keep public class mypackage.parsers.JacksonParser.** {
  public void set*(***);
  public *** get*();
}

#Picasso
-dontwarn com.squareup.okhttp.**

#-dontwarn javax.management.**
#-dontwarn java.lang.management.**
#-dontwarn org.apache.log4j.**
#-dontwarn org.apache.commons.logging.**
#-dontwarn org.json.*
#-dontwarn org.apache.commons.codec.binary.Base64

#-keep class javax.** {* ; }
#-keep class org.** { *; }

-dontwarn org.mortbay.**
-dontwarn org.slf4j.**
-dontwarn org.apache.log4j.**
-dontwarn org.apache.commons.logging.**
-dontwarn org.apache.commons.codec.binary.**

推荐答案

此页面说:

默认的proguard.cfg文件试图覆盖一般情况，但是您 可能会遇到诸如ClassNotFoundException之类的异常， 当ProGuard剥夺您的整个班级时发生 应用程序调用.

The default proguard.cfg file tries to cover general cases, but you might encounter exceptions such as ClassNotFoundException, which happens when ProGuard strips away an entire class that your application calls.

当ProGuard删除代码时，您可以通过添加以下内容来修复错误: proguard.cfg文件中的-keep行.例如:

You can fix errors when ProGuard strips away your code by adding a -keep line in the proguard.cfg file. For example:

-keep public class <MyClass>

使用-keep选项时，有很多选项和注意事项， 因此强烈建议您阅读ProGuard手册以了解更多信息 有关自定义配置文件的信息.概述 保留选项"和示例"部分特别有用.这 ProGuard手册的故障排除"部分概述了其他常见问题 剥离代码时可能会遇到的问题.

There are many options and considerations when using the -keep option, so it is highly recommended that you read the ProGuard Manual for more information about customizing your configuration file. The Overview of Keep options and Examples sections are particularly helpful. The Troubleshooting section of the ProGuard Manual outlines other common problems you might encounter when your code gets stripped away.

解决方案1 ​​

您可以尝试以下proguard.cfg我曾经在优化代码时使代码模糊不清，因此没有从APK中删除类/方法.

Solution 1

You could try the following proguard.cfg I used to obfuscate the code while not optimising, and hence not remove classes/methods from your APK.

-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-dontoptimize
-verbose

解决方案2

您已经要求保留一些课程，但没有要求MainActivity.因此，您必须添加以下行:

Solution 2

You have asked some classes to be kept but not for MainActivity. So you have to add this line:

-keep class com.mypackage.activities.MainActivity { *; }

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