http://www.myexception.cn/android/1477945.html

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androidsdk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

# 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

-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 ;}-keepclasseswithmembernames class * {    public (android.content.Context, android.util.AttributeSet);}-keepclasseswithmembernames class * {    public (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/examples中的例子及注释。)

接下来按照google帮助文档里说的

引用

To enable ProGuard so that it runs as part of an Ant or Eclipsebuild, set the proguard.config property in the /default.propertiesfile. The path can be an absolute path or a path relative to theproject's root.

所以我们修改default.propertiesfile

加上一句

proguard.config=proguard.cfg

如下

# 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AndroidTools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!