Android Studio 代码混淆核心解释

混淆规则

1.基本规则

两个常用的混淆命令，注意一颗星表示只是保持该包下的类名，而子包下的类名还是会被混淆；两颗星表示把本包和所含子包下的类名都保持；

-keep class cn.hadcn.test.**
-keep class cn.hadcn.test.*

用以上方法保持类后，你会发现类名虽然未混淆，但里面的具体方法和变量命名还是变了，这时如果既想保持类名，又想保持里面的内容不被混淆，我们就需要以下方法了

-keep class com.example.bean.** { *; }

在此基础上，我们也可以使用Java的基本规则来保护特定类不被混淆，比如我们可以用extend，implement等这些Java规则。如下例子就避免所有继承Activity的类被混淆

官方默认的混淆配置

android Studio中做混淆，基本就是对Proguard-rules.pro文件的操作。混淆的过程也是有规律可循的。先看看官方的proguard-android.txt文件，位于/tools/proguard目录下，不知道怎么写，可以当成模板，复制一份出来到自己的工程，改成自己项目所需的混淆配置。内容如下：

# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-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).
-dontoptimize
-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.-keepattributes *Annotation*
-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
-keepclasseswithmembernames class * {native <methods>;
}# keep setters in Views so that animations can still work.
# see http://proguard.sourceforge.net/manual/examples.html#beans
-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
-keepclassmembers class * extends android.app.Activity {public void *(android.view.View);
}# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
-keepclassmembers enum * {public static **[] values();public static ** valueOf(java.lang.String);
}-keepclassmembers class * implements android.os.Parcelable {public static final android.os.Parcelable$Creator CREATOR;
}-keepclassmembers class **.R$* {public static <fields>;
}# The support library contains references to newer platform versions.
# Don't warn about those in case this app is linking against an older
# platform version.  We know about them, and they are safe.
-dontwarn android.support.**# Understand the @Keep support annotation.
-keep class android.support.annotation.Keep-keep @android.support.annotation.Keep class * {*;}-keepclasseswithmembers class * {@android.support.annotation.Keep <methods>;
}-keepclasseswithmembers class * {@android.support.annotation.Keep <fields>;
}-keepclasseswithmembers class * {@android.support.annotation.Keep <init>(...);
}

基本的混淆模板

最后提供一份基本的混淆模板，当然第三方库，或者上面提到的地方，根据自己的实际需求进行混淆

#############################################
#
# 对于一些基本指令的添加
#
#############################################
# 代码混淆压缩比，在0~7之间，默认为5，一般不做修改
-optimizationpasses 5# 混合时不使用大小写混合，混合后的类名为小写
-dontusemixedcaseclassnames# 指定不去忽略非公共库的类
-dontskipnonpubliclibraryclasses# 这句话能够使我们的项目混淆后产生映射文件
# 包含有类名->混淆后类名的映射关系
-verbose# 指定不去忽略非公共库的类成员
-dontskipnonpubliclibraryclassmembers# 不做预校验，preverify是proguard的四个步骤之一，Android不需要preverify，去掉这一步能够加快混淆速度。
-dontpreverify# 保留Annotation不混淆
-keepattributes *Annotation*,InnerClasses# 避免混淆泛型
-keepattributes Signature# 抛出异常时保留代码行号
-keepattributes SourceFile,LineNumberTable# 指定混淆是采用的算法，后面的参数是一个过滤器
# 这个过滤器是谷歌推荐的算法，一般不做更改
-optimizations !code/simplification/cast,!field/*,!class/merging/*#############################################
#
# Android开发中一些需要保留的公共部分
#
############################################## 保留我们使用的四大组件，自定义的Application等等这些类不被混淆
# 因为这些子类都有可能被外部调用
-keep public class * extends android.app.Activity
-keep public class * extends android.app.Appliction
-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# 保留support下的所有类及其内部类
-keep class android.support.** {*;}# 保留继承的
-keep public class * extends android.support.v4.**
-keep public class * extends android.support.v7.**
-keep public class * extends android.support.annotation.**# 保留R下面的资源
-keep class **.R$* {*;}# 保留本地native方法不被混淆
-keepclasseswithmembernames class * {native <methods>;
}# 保留在Activity中的方法参数是view的方法，
# 这样以来我们在layout中写的onClick就不会被影响
-keepclassmembers class * extends android.app.Activity{public void *(android.view.View);
}# 保留枚举类不被混淆
-keepclassmembers enum * {public static **[] values();public static ** valueOf(java.lang.String);
}# 保留我们自定义控件（继承自View）不被混淆
-keep public class * extends android.view.View{*** get*();void set*(***);public <init>(android.content.Context);public <init>(android.content.Context, android.util.AttributeSet);public <init>(android.content.Context, android.util.AttributeSet, int);
}# 保留Parcelable序列化类不被混淆
-keep class * implements android.os.Parcelable {public static final android.os.Parcelable$Creator *;
}# 保留Serializable序列化的类不被混淆
-keepclassmembers class * implements java.io.Serializable {static final long serialVersionUID;private static final java.io.ObjectStreamField[] serialPersistentFields;!static !transient <fields>;!private <fields>;!private <methods>;private void writeObject(java.io.ObjectOutputStream);private void readObject(java.io.ObjectInputStream);java.lang.Object writeReplace();java.lang.Object readResolve();
}# 对于带有回调函数的onXXEvent、**On*Listener的，不能被混淆
-keepclassmembers class * {void *(**On*Event);void *(**On*Listener);
}# webView处理，项目中没有使用到webView忽略即可
-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);
}

Android混淆的方法和通配符对照表