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
# 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 <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
引用
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
# 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!