为了防止自己的劳动成果被别人窃取，混淆代码能有效防止被反编译，下面来总结以下混淆代码的步骤：
2、编辑项目下的proguard-project.txt，添加不需要混淆的规则（model、泛型、反射、第三方jar包），proguard-project.txt文件内容如下：
# To enable ProGuard in your project, edit project.properties
# to define the proguard.config property as described in that file.
#
# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in ${sdk.dir}/tools/proguard/proguard-android.txt
# You can edit the include path and order by changing the ProGuard
# include property in project.properties.
#
# For more details, see
# http://developer.android.com/guide/developing/tools/proguard.html # Add any project specific keep options here: # If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
# public *;
#} #####################################
######### 主程序不能混淆的代码 #########
#####################################
######-dontwarn xxx.model.**
######-keep class xxx.model.** { *; } #####################################
########### 不优化泛型和反射 ##########
#####################################
-keepattributes Signature
-keep class * extends java.lang.annotation.Annotation { *; } #####################################
######### 不混淆第三方库或者jar包 #######
#####################################
-dontwarn net.sourceforge.jtds.**
-keep class net.sourceforge.jtds.** { *; } -dontwarn com.iflytek.speech.**
-keep class com.iflytek.speech.** { *; } -dontwarn com.lidroid.xutils.**
-keep class com.lidroid.xutils.** { *; }
#####################################
技巧：第三方jar包包名可以用WinRAR来打开jar文件，获取包路径。例如：jtds-1.2.jar，用WinRAR查看，可以发现包名为：net.sourceforge.jtds，所以只需要添加如下2行代码，即可不混淆该jar文件的相关包和类：
-dontwarn net.sourceforge.jtds.**
-keep class net.sourceforge.jtds.** { *; }
参考文章：
1、http://blog.csdn.net/lovexjyong/article/details/24652085
2、http://www.cnblogs.com/qianxudetianxia/p/4948499.html