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??
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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?*;??
- }??
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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.??
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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??
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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!
转：
http://blog.csdn.net/Zengyangtech/archive/2011/01/10/6127600.aspx
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