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作为Android应用开发者，不得不面对一个尴尬的局面，就是自己辛辛苦苦开发的应用可以被别人很轻易的就反编译出来。Google似乎也发现了这个问题，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。 下面具体说一说怎么样让SDK2.3下的proguard.cfg文件起作用，先来看看 android-sdk-windows\tools\lib\proguard.cfg的内容：
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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 * extends android.app.backup.BackupAgentHelper -keep public class * extends android.preference.Preference -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$Creator *; }
-optimizationpasses 5-dontusemixedcaseclassnames-dontskipnonpubliclibraryclasses-dontpreverify-verbose-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*-keep public class * extends android.app.Activity-keep public class * extends android.app.Application-keep public class * extends android.app.Service-keep public class * extends android.content.BroadcastReceiver-keep public class * extends android.content.ContentProvider-keep public class * extends android.app.backup.BackupAgentHelper-keep public class * extends android.preference.Preference-keep public class com.android.vending.licensing.ILicensingService-keepclasseswithmembernames class * { native <methods>;}-keepclasseswithmembernames class * { public <init>(android.content.Context, android.util.AttributeSet);}-keepclasseswithmembernames class * { public <init>(android.content.Context, android.util.AttributeSet, int);}-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String);}-keep class * implements android.os.Parcelable { public static final android.os.Parcelable$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。) 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：
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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
proguardproguard.config=proguard.cfg
# 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-9proguard.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。
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。
有些应用反编译后java代码用jd-ui根本都无法打开，连混淆的代码都看不到的，本人尝试多次都做不到，希望知道的告知下怎么处理的。
注意：上面的功能只是把java代码混淆了，xml和资源文件、图片并没有混淆，有些游戏应用图片比较重要需要转换成dat文件 再加上自己的加密解密算法还原。另外加了混淆功能后还有压缩的功能，混淆后的apk比原来的小(具体比例看你的代码重复量了)
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