Google在2.3之后tools中就添加了自带的混淆器android-sdk-windows\tools\proguard
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使用步骤如下：
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一、在新建2.3项目的时候会自动生成proguard.cfg的文件
（如果你是2.3之前的版本，需要自己拷贝此文件到工程目录下）
文件中代码已经生成，如下：
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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>;}-keepclasseswithmembers class * { public <init>(android.content.Context, android.util.AttributeSet);}-keepclasseswithmembers class * { public <init>(android.content.Context, android.util.AttributeSet, int);}-keepclassmembers class * extends android.app.Activity { public void *(android.view.View);}-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String);}-keep class * implements android.os.Parcelable { public static final android.os.Parcelable$Creator *;}?
二、在project.properties(default.properties)中添加一行命令，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,# "ant.properties", and override values to adapt the script to your# project structure.# Project target.target=android-9proguard.config=proguard.cfg
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三、重新生成apk
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这里需要注意的是，如果只是clean后再bin下面生成的apk，会发现混淆没有起作用，还是和以前一样
这里我使用 右键点击工程->>Android Tools->>Export Signed Application Package..
上述步骤是对程序进行签名发布，在这时会对代码进行混淆。
如果混淆遇到错误，请首先检查你的工程路径是不是存在空格。
然后反编译出来就是a b c d之类的了