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android怎么代码混淆

热度:103   发布时间:2016-04-28 04:54:57.0
android如何代码混淆

从SDK2.3开始我们可以看到在android-sdk-windows\tools\下面多了一个proguard文件夹proguard是一个java代码混淆的工具,通过proguard,别人即使反编译你的apk包,也只会看到一些让人很难看懂的代码,从而达到保护代码的作用。

来看看android-sdk-windows\tools\lib\proguard.cfg的内容:

Java代码??收藏代码
  1. -optimizationpasses?5??
  2. -dontusemixedcaseclassnames??
  3. -dontskipnonpubliclibraryclasses??
  4. -dontpreverify??
  5. -verbose??
  6. -optimizations?!code/simplification/arithmetic,!field/*,!class/merging/*??
  7. ??
  8. -keep?public?class?*?extends?android.app.Activity??
  9. -keep?public?class?*?extends?android.app.Application??
  10. -keep?public?class?*?extends?android.app.Service??
  11. -keep?public?class?*?extends?android.content.BroadcastReceiver??
  12. -keep?public?class?*?extends?android.content.ContentProvider??
  13. -keep?public?class?*?extends?android.app.backup.BackupAgentHelper??
  14. -keep?public?class?*?extends?android.preference.Preference??
  15. -keep?public?class?com.android.vending.licensing.ILicensingService??
  16. ??
  17. -keepclasseswithmembernames?class?*?{??
  18. ????native?<methods>;??
  19. }??
  20. ??
  21. -keepclasseswithmembernames?class?*?{??
  22. ????public?<init>(android.content.Context,?android.util.AttributeSet);??
  23. }??
  24. ??
  25. -keepclasseswithmembernames?class?*?{??
  26. ????public?<init>(android.content.Context,?android.util.AttributeSet,?int);??
  27. }??
  28. ??
  29. -keepclassmembers?enum?*?{??
  30. ????public?static?**[]?values();??
  31. ????public?static?**?valueOf(java.lang.String);??
  32. }??
  33. ??
  34. -keep?class?*?implements?android.os.Parcelable?{??
  35. ??public?static?final?android.os.Parcelable$Creator?*;??
  36. }??

?

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。)

让proguard.cfg起作用的做法很简单,就是在eclipse自动生成的default.properties文件中加上一句“proguard.config=proguard.cfg”就可以了

完整的default.properties文件应该如下:

?

Java代码??收藏代码
  1. #?This?file?is?automatically?generated?by?Android?Tools.??
  2. #?Do?not?modify?this?file?--?YOUR?CHANGES?WILL?BE?ERASED!??
  3. #??
  4. #?This?file?must?be?checked?in?Version?Control?Systems.??
  5. #??
  6. #?To?customize?properties?used?by?the?Ant?build?system?use,??
  7. #?"build.properties",?and?override?values?to?adapt?the?script?to?your??
  8. #?project?structure.??
  9. ??
  10. #?Project?target.??
  11. target=android-9??
  12. proguard.config=proguard.cfg??

?


大功告成,正常的编译签名后就可以防止代码被反编译了。反编译经过代码混淆的apk得到的代码应该类似于下面的效果,是很难看懂的:



?如果您使用的是2.3之前的SDK版本也没关系,把上面的proguard.cfg文件复制一份放到项目中,然后进行相同的操作即可

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