Android优雅的进行混淆——使用@Keep注解重要

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http://www.jianshu.com/p/be7ec1819d2f

 不能混淆的项
<pre class="hljs undefined" data-original-code="" 在androidmanifest中配置的类，比如四大组件"="" data-snippet-id="ext.4c8dd53355a8d1beda633d1900397448" data-snippet-saved="false" data-codota-status="done">在AndroidManifest中配置的类，比如四大组件
JNI调用的方法
反射用到的类
WebView中JavaScript调用的方法
Layout文件引用到的自定义View
一些引入的第三方库

使用工具AndroidStudio

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

使用proguard混淆代码是对产品本身的一种保护，常见的方法就是编写projuard-rules.pro配置文件

# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html//混淆时不使用大小写混合类名
-dontusemixedcaseclassnames
//不跳过library中的非public的类
-dontskipnonpubliclibraryclasses
//打印混淆的详细信息
-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).
//不进行优化，建议使用此选项，理由见上
-dontoptimize
//不进行预校验，预校验是作用在Java平台上的，Android平台上不需要这项功能，去掉之后还可以加快混淆速度
-dontpreverify
# Note that if you want to enable optimization, you cannot just
# include optimization flags in your own project configuration file;
# instead you will need to point to the
# "proguard-android-optimize.txt" file instead of this one from your
# project.properties file.//保留注解参数
-keepattributes *Annotation*
//保留Google原生服务需要的类
-keep public class com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService# For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
//保留native方法的类名和方法名
-keepclasseswithmembernames class * {native <methods>;
}# keep setters in Views so that animations can still work.
# see http://proguard.sourceforge.net/manual/examples.html#beans
//保留自定义View,如"属性动画"中的set/get方法
-keepclassmembers public class * extends android.view.View {void set*(***);*** get*();
}# We want to keep methods in Activity that could be used in the XML attribute onClick
//保留Activity中参数是View的方法，如XML中配置android:onClick=”buttonClick”属性，Activity中调用的buttonClick(View view)方法
-keepclassmembers class * extends android.app.Activity {public void *(android.view.View);
}# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
//保留混淆枚举中的values()和valueOf()方法
-keepclassmembers enum * {public static **[] values();public static ** valueOf(java.lang.String);
}//Parcelable实现类中的CREATOR字段是绝对不能改变的，包括大小写
-keepclassmembers class * implements android.os.Parcelable {public static final android.os.Parcelable$Creator CREATOR;
}//R文件中的所有记录资源id的静态字段
-keepclassmembers class **.R$* {public static <fields>;
}# The support library contains references to newer platform versions.
# Dont warn about those in case this app is linking against an older
# platform version.  We know about them, and they are safe.
//忽略support包因为版本兼容产生的警告
-dontwarn android.support.**

Proguard关键字

关键字                      描述
keep                        保留类和类中的成员，防止被混淆或移除
keepnames                   保留类和类中的成员，防止被混淆，成员没有被引用会被移除
keepclassmembers            只保留类中的成员，防止被混淆或移除
keepclassmembernames        只保留类中的成员，防止被混淆，成员没有引用会被移除
keepclasseswithmembers      保留类和类中的成员，防止被混淆或移除，保留指明的成员
keepclasseswithmembernames  保留类和类中的成员，防止被混淆，保留指明的成员，成员没有引用会被移除

Proguard通配符

通配符      描述
<field>     匹配类中的所有字段
<method>    匹配类中所有的方法
<init>      匹配类中所有的构造函数
*           匹配任意长度字符，不包含包名分隔符(.)
**          匹配任意长度字符，包含包名分隔符(.)
***         匹配任意参数类型
...

指定混淆时可使用字典

-applymapping filename 指定重用一个已经写好了的map文件作为新旧元素名的映射。
-obfuscationdictionary filename 指定一个文本文件用来生成混淆后的名字。
-classobfuscationdictionary filename 指定一个混淆类名的字典
-packageobfuscationdictionary filename 指定一个混淆包名的字典
-overloadaggressively 混淆的时候大量使用重载，多个方法名使用同一个混淆名（慎用）# 这里巧妙地使用java中的关键字作字典，混淆之后的代码更加不利于阅读## This obfuscation dictionary contains reserved Java keywords. They can't# be used in Java source files, but they can be used in compiled class files.# Note that this hardly improves the obfuscation. Decent decompilers can# automatically replace reserved keywords, and the effect can fairly simply be# undone by obfuscating again with simpler names.# Usage:#     java -jar proguard.jar ..... -obfuscationdictionary keywords.txt#doifforintnewtrybytecasecharelsegotolongthisvoidbreakcatchclassconstfinalfloatshortsuperthrowwhiledoubleimportnativepublicreturnstaticswitchthrowsbooleandefaultextendsfinallypackageprivateabstractcontinuestrictfpvolatileinterfaceprotectedtransientimplementsinstanceofsynchronized

使用proguardgui对jar包进行混淆

proguardgui工具支持Shrinking(压缩)、Optimization(优化)、Obfuscation(混淆)、Preverification(预校验)四项操作详细步骤：1 Load configuration --> Next2 Add input/Add output3 添加jar包依赖JAVA_HOME/jre/lib/rt.jarAndroid_SDK/platfroms/android-23/android.jarAndroidStudioProjects/ProjectName/app/build/intermediates/exploded-aar/com.android.support/appcompat-v7/23.4.0/jars/classes.jarAndroidStudioProjects/ProjectName/app/build/intermediates/exploded-aar/com.android.support/support-v4/23.4.0/jars/classes.jarAndroidStudioProjects/ProjectName/app/build/intermediates/exploded-aar/com.android.support/support-v4/23.4.0/jars/libs/internal_impl-23.4.0.jar其他第三方jar文件4 Don`t use Shrink --> Next5 Add --> Extends/implements class --> android.app.Activity --> ok --> Next6 Next7 Next8 View configuration
tips:AndroidStudio中生成jar文件方法：jar -cvf filename.jar -C app/build/intermediates/classes/debug

5分钟快速混淆

#-------------------------------------------定制化区域----------------------------------------------
#---------------------------------1.实体类----------------------------------keep class com.demo.login.bean.** { *; }
-keep class com.demo.main.bean.** { *; }#-------------------------------------------------------------------------#---------------------------------2.第三方包-------------------------------#eventBus
-keepattributes *Annotation*
-keepclassmembers class ** {@org.greenrobot.eventbus.Subscribe <methods>;
}
-keep enum org.greenrobot.eventbus.ThreadMode { *; }
-keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {<init>(java.lang.Throwable);
}#glide
-keep public class * implements com.bumptech.glide.module.GlideModule
-keep public enum com.bumptech.glide.load.resource.bitmap.ImageHeaderParser$** {**[] $VALUES;public *;
}#log4j
-libraryjars log4j-1.2.17.jar
-dontwarn org.apache.log4j.**
-keep class  org.apache.log4j.** { *;}#-------------------------------------------------------------------------#---------------------------------3.与js互相调用的类-------------------------keepclasseswithmembers class com.demo.login.bean.ui.MainActivity$JSInterface { <methods>; 
}#-------------------------------------------------------------------------#---------------------------------4.反射相关的类和方法-----------------------
# 有
#----------------------------------------------------------------------------
#---------------------------------------------------------------------------------------------------#-------------------------------------------基本不用动区域--------------------------------------------
#---------------------------------基本指令区----------------------------------
-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontskipnonpubliclibraryclassmembers
-dontpreverify
-verbose
-printmapping proguardMapping.txt
-optimizations !code/simplification/cast,!field/*,!class/merging/*
-keepattributes *Annotation*,InnerClasses
-keepattributes Signature
-keepattributes SourceFile,LineNumberTable
#----------------------------------------------------------------------------#---------------------------------默认保留区---------------------------------
-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.BackupAgentHelper
-keep public class * extends android.preference.Preference
-keep public class * extends android.view.View
-keep public class com.android.vending.licensing.ILicensingService
-keep class android.support.** {*;}-keepclasseswithmembernames class * {native <methods>;
}
-keepclassmembers class * extends android.app.Activity{public void *(android.view.View);
}
-keepclassmembers enum * {public static **[] values();public static ** valueOf(java.lang.String);
}
-keep public class * extends android.view.View{*** get*();void set*(***);public <init>(android.content.Context);public <init>(android.content.Context, android.util.AttributeSet);public <init>(android.content.Context, android.util.AttributeSet, int);
}
-keepclasseswithmembers class * {public <init>(android.content.Context, android.util.AttributeSet);public <init>(android.content.Context, android.util.AttributeSet, int);
}
-keep class * implements android.os.Parcelable {public static final android.os.Parcelable$Creator *;
}
-keepclassmembers class * implements java.io.Serializable {static final long serialVersionUID;private static final java.io.ObjectStreamField[] serialPersistentFields;private void writeObject(java.io.ObjectOutputStream);private void readObject(java.io.ObjectInputStream);java.lang.Object writeReplace();java.lang.Object readResolve();
}
-keep class **.R$* {*;
}
-keepclassmembers class * {void *(**On*Event);
}
#----------------------------------------------------------------------------#---------------------------------webview------------------------------------
-keepclassmembers class fqcn.of.javascript.interface.for.Webview {public *;
}
-keepclassmembers class * extends android.webkit.WebViewClient {public void *(android.webkit.WebView, java.lang.String, android.graphics.Bitmap);public boolean *(android.webkit.WebView, java.lang.String);
}
-keepclassmembers class * extends android.webkit.WebViewClient {public void *(android.webkit.WebView, jav.lang.String);
}
#----------------------------------------------------------------------------
#---------------------------------------------------------------------------------------------------# 删除代码中Log相关的代码
-assumenosideeffects class android.util.Log {public static boolean isLoggable(java.lang.String, int);public static int v(...);public static int i(...);public static int w(...);public static int d(...);public static int e(...);
}

网上有很多5分钟完成混淆规则的教程，但如何更优雅的完成这一枯燥的过程，即使用@Keep注解，使混淆变得轻松愉快

在proguard-rules.pro配置文件中加入以下规则

#手动启用support keep注解
#http://tools.android.com/tech-docs/support-annotations
-dontskipnonpubliclibraryclassmembers
-printconfiguration
-keep,allowobfuscation @interface android.support.annotation.Keep-keep @android.support.annotation.Keep class *
-keepclassmembers class * {@android.support.annotation.Keep *;
}

哪里不对@Keep哪里，妈妈再也不用担心我不会混淆啦……

参考资料
http://blog.csdn.net/guolin_blog/article/details/50451259
http://www.jianshu.com/p/60e82aafcfd0

作者：Ziv_紫藤花开
链接：http://www.jianshu.com/p/be7ec1819d2f
來源：简书
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