参考博文：http://www.jianshu.com/p/0a3ce6e9ab85
开展项目合作时，基于模块化思想，对方要用到你的程序，而你又不想将源代码给对方，通常会将程序进行打包生成jar，并作混淆处理。
1、创建项目
【File】——【New Module】——【Android Library】，命名，然后编辑代码。
二、编辑library路径下的build.gradle
AS中进行代码混淆需要在build.gradle文件和proguard-rules.pro文件中进行设置（可以通过jd-gui工具对比混淆前后效果）：
1、配置build.gradle文件
你的library库下打开build.gradle文件，在末尾加上下述代码。
task makeJar(type: proguard.gradle.ProGuardTask, dependsOn: "build") { //删除已有的jar包 delete 'build/outputs/ips.jar' // 未混淆的jar路径 injars 'build/intermediates/bundles/release/classes.jar' // 混淆后的jar输出路径 outjars 'build/outputs/ips.jar' // 混淆协议 configuration 'proguard-rules.pro' }说明：（1）AS会自动对library进行打包，即build/intermediates/bundles/release/classes.jar，只是未进行混淆工作而已；
（2）在delete和injars中的ips.jar是你要打包的jar包名字。
2、配置proguard-rules.pro文件
（1）把AS自带的协议配置进来
# This is a configuration file for ProGuard. # http://proguard.sourceforge.net/index.html#manual/usage.html # # Starting with version 2.2 of the Android plugin for Gradle, these files are no longer used. Newer # versions are distributed with the plugin and unpacked at build time. Files in this directory are # no longer maintained. #表示混淆时不使用大小写混合类名 -dontusemixedcaseclassnames #表示不跳过library中的非public的类 -dontskipnonpubliclibraryclasses #打印混淆的详细信息 -verbose # Optimization is turned off by default. Dex does not like code run # through the ProGuard optimize and preverify steps (and performs some # of these optimizations on its own). -dontoptimize ##表示不进行校验,这个校验作用 在java平台上的 -dontpreverify # Note that if you want to enable optimization, you cannot just # include optimization flags in your own project configuration file; # instead you will need to point to the # "proguard-android-optimize.txt" file instead of this one from your # project.properties file. -keepattributes *Annotation* -keep public class com.google.vending.licensing.ILicensingService -keep public class com.android.vending.licensing.ILicensingService # For native methods, see http://proguard.sourceforge.net/manual/examples.html#native -keepclasseswithmembernames class * { native <methods>; } # keep setters in Views so that animations can still work. # see http://proguard.sourceforge.net/manual/examples.html#beans -keepclassmembers public class * extends android.view.View { void set*(***); *** get*(); } # We want to keep methods in Activity that could be used in the XML attribute onClick -keepclassmembers class * extends android.app.Activity { public void *(android.view.View); } # For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations -keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); } -keepclassmembers class * implements android.os.Parcelable { public static final android.os.Parcelable$Creator CREATOR; } -keepclassmembers class **.R$* { public static <fields>; } # The support library contains references to newer platform versions. # Don't warn about those in case this app is linking against an older # platform version. We know about them, and they are safe. -dontwarn android.support.** # Understand the @Keep support annotation. -keep class android.support.annotation.Keep -keep @android.support.annotation.Keep class * {*;} -keepclasseswithmembers class * { @android.support.annotation.Keep <methods>; } -keepclasseswithmembers class * { @android.support.annotation.Keep <fields>; } -keepclasseswithmembers class * { @android.support.annotation.Keep <init>(...); }
参考http://www.jianshu.com/p/0a3ce6e9ab85。
（2）引入依赖包路径
#引入依赖包rt.jar（jdk路径） -libraryjars 'D:\Android_Studio\Android_Studio_Install\jre\jre\lib\rt.jar' #引入依赖包android.jar(android SDK路径) -libraryjars 'D:\Android_Studio\Android_SDK\platforms\android-25\android.jar' #如果用到其他包，需要引入 #忽略警告 -ignorewarnings #保证是独立的jar,没有任何项目引用,如果不写就会认为我们所有的代码是无用的,从而把所有的代码压缩掉,导出一个空的jar -dontshrink #保护泛型 -keepattributes Signature（3）加入自己不想混淆的配置这个根据实际情况选择性配置
#自己不想混淆的配置,保证com下的类名不被混淆 -keep class ips.casm.com.**{public *;}看下添加（3）和不添加（3）的效果
不混淆 混淆
3、执行打包命令
在Terminal 窗口输入下面代码：
gradlew makeJar提示BUILD SUCCESSFUL表示打包成功！
说明：上面的命令是在windows下，而在mac下则需要输入
./gradlew makeJar 4、jar包路径ipslibrary（你的library）/build/outputs/ips.jar（你的jar包名称）
三、用jd_gui或导入到AS查看jar打包效果
