我在我的android项目中启用了MultiDex。它工作正常，直到我尝试启用proguard。我可以成功构建项目，但我在启动时遇到运行时异常。它无法找到Application类和MainActivity。在启用MultiDex之前，我遇到了同样的问题。现在我想由于某种原因MultiDex与ProGuard无法正常工作。这是我在logcat中得到的东西 -
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
之后，堆栈跟踪的其余部分是关于MainActivity的ClassNotFoundException：
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
修改 - 这是我的proguard规则文件：
-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.**
答案 0 :(得分：4)
默认
proguard.cfg文件试图涵盖一般情况，但是你 可能会遇到例如ClassNotFoundException等异常 当ProGuard剥离你的整个班级时，就会发生这种情况 应用程序调用。当ProGuard通过添加a删除代码时，您可以修复错误
-keep文件中的proguard.cfg行。例如：-keep public class <MyClass>使用-keep选项时有很多选项和注意事项， 所以强烈建议您阅读ProGuard手册了解更多信息 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。该 ProGuard手册的故障排除部分概述了其他常见问题 代码被剥离后可能遇到的问题。
您可以尝试以下proguard.cfg我曾经在不优化时混淆代码，因此不会从APK中删除类/方法。
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-dontoptimize
-verbose
您已经要求保留一些课程，但不是MainActivity。所以你必须添加这一行：
-keep class com.mypackage.activities.MainActivity { *; }