代码混淆proguard技术介绍

由于各种反编译工具的泛滥，作为Android程序员在2.3版本以前只能通过手动添加proguard来实现代码混淆



proguard这个工具是一个java代码混淆的工具



在2.3版本的sdk中 我们可以看到在android-sdk-windows/tools/下面多了一个proguard文件夹

google已经把proguard技术放在了android sdk里面 可以通过正常的编译方式也能实现代码混淆了







可以看见新建一个工程里面有default.properties和proguard.cfg



默认的default.properties代码如下




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# This file is automatically generated by Android Tools.

# Do not modify this file -- YOUR CHANGES WILL BE ERASED!

#

# This file must be checked in Version Control Systems.

#

# To customize properties used by the Ant build system use,

# "build.properties", and override values to adapt the script to your

# project structure.

# Project target.

target=android-9



我们可以看到proguard.cfg已经帮我们写好了优化代码脚本




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-optimizationpasses 5

-dontusemixedcaseclassnames

-dontskipnonpubliclibraryclasses

-dontpreverify

-verbose

-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-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 com.android.vending.licensing.ILicensingService

-keepclasseswithmembernames class * {

native <methods>;

}

-keepclasseswithmembernames class * {

public <init>(android.content.Context, android.util.AttributeSet);

}

-keepclasseswithmembernames class * {

public <init>(android.content.Context, android.util.AttributeSet, int);

}

-keepclassmembers enum * {

public static **[] values();

public static ** valueOf(java.lang.String);

}

-keep class * implements android.os.Parcelable {

public static final android.os.Parcelable$Creator *;

}



从脚本中可以看到，混淆中保留了继承自Activity、Service、Application、BroadcastReceiver、 ContentProvider等基本组件以及com.android.vending.licensing.ILicensingService



并保留了所有的Native变量名及类名，所有类中部分以设定了固定参数格式的构造函数，枚举等等。(详细信息请参考<proguard_path>/examples中的例子及注释。)



接下来 按照google帮助文档里说的




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To enable ProGuard so that it runs as part of an Ant or Eclipse build, set the proguard.config property in the <project_root>/default.properties file. The path can be an absolute path or a path relative to the project's root.



所以我们修改default.properties file

加上一句

proguard.config=proguard.cfg

如下




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# This file is automatically generated by Android Tools.

# Do not modify this file -- YOUR CHANGES WILL BE ERASED!

#

# This file must be checked in Version Control Systems.

#

# To customize properties used by the Ant build system use,

# "build.properties", and override values to adapt the script to your

# project structure.

# Project target.

target=android-9

proguard.config=proguard.cfg





然后正常的编译签名即可



然后用Android Tools生成一个发布的apk即可







然后用反编译工具查看dex文件

最后导出反编译之后的混淆代码如下图











是不是很轻松加愉快!希望各位程序员都能保护好自己的Android代码!









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