使用AS打包混淆Jar包，百度一下，一片一片的，但是很多都是零零散散的写得不是很详细或是直接拷贝，按照他们的教程测试总不是很顺利，所以这里我就把我个人学习AS打包混淆Jar的成果总结出来，希望对大家有帮助。个人觉得写得还是比较详细的

使用gradle混淆打包Jar

使用AS开发项目，引入第三方库是非常方便的，我们只需要在build.gradle中配置一行代码就可以轻松引入我们需要的开发库。那么gradle可以帮我们混淆打包Jar吗？答案是当然可以！

那么我们如何打包Jar呢？其实我们在编译项目的时候，AS已经帮我们在目录build/intermediates/bundles/release/classes.jar打好了Jar。那么我们需要做的就是把Jar进行混淆的工作了。这里以个人项目bannerDemo 为例，混淆步骤如下:

在你的library的`build.gradle`文件中加入如下代码：

 task makeJar(type: proguard.gradle.ProGuardTask, dependsOn: "build") { 
   // 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/cocolove2-banner-1.1.0.jar'  
  // 混淆协议
  configuration 'proguard-rules.pro'
}

配置混淆协议

1.我们先把AS自带的协议配置进来中文注释，笔者添加

# 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# no longer maintained.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 ;
}

# 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 ;
}

# 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 ;
}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep ;
}

-keepclasseswithmembers class * {
    @android.support.annotation.Keep (...);
}

2.AS自带的配置文档还是不够的，我们还需要加入如下配置
这里只展示基本操作，在实际开发中可能需要更多依赖，要根据具体情况引入自己需要的依赖包

#下面代码中的xx是指我个人的配置路径,涉及个人信息，这里以xx代替
#引入依赖包rt.jar（jdk路径）
-libraryjars /xxx/xx/xx/jdk1.8.0_77.jdk/Contents/Home/jre/lib/rt.jar
#引入依赖包android.jar(android SDK路径)
-libraryjars /xx/xx/xx/Android/sdk/platforms/android-24/android.jar
#如果用到Appcompat包，需要引入
-libraryjars /xxx/xxx/xx/xxx/MyApplication/library-banner/build/intermediates/exploded-aar/com.android.support/appcompat-v7/24.1.1/jars/classes.jar
-libraryjars /xx/xx/xx/xx/MyApplication/library-banner/build/intermediates/exploded-aar/com.android.support/support-v4/24.1.1/jars/classes.jar

#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根据实际需求配置

-keep class com.cocolove2.library_banner.view.**{*;}

在命令行执行命令混淆Jar，提示`BUILD SUCCESFUL`表示成功！

//mac
./gradlew makeJar

//windows
gradlew makeJar

示例展示

1.首先我们要看看下我们的buildTool的配置,如下图：

如果你的项目的buildTool#Gradle配置如上图，那你打包混淆的第一步已经完成了，而如果选择的是本地的gradle，当你执行./gradlew makeJar时，系统会先下载gradle,不知是网络不好还是被墙掉了，我每次尝试下载都是等了很久，最终也没成功。

2.在项目目录下执行./gradlew makeJar打包输出混淆的Jar，如下图

QQ20160827-0@2x.png

QQ20160827-1@2x.png

3.查看混淆结果.

混淆报错解决办法`个人遇到的`

#log提示缺少依赖Jar,或者路径不对

解决办法：乖乖的引入缺少的依赖jar和修改路径

#提示如下异常
[INFO] java.io.IOException: Can't read [D:\Program 
Files\Java\jdk1.8.0_91\jre\lib\rt.jar] (Can't process class 
[com/oracle/net/Sdp$1.class] (Unsupported class version number
 [52.0] (maximum 51.0, Java 1.7)))

解决办法：
下载最新proguard（支持Java 8的版本），然后将下载的文件解压。
将andorid sdk/tools/proguard/lib中的jar包，替换为刚下载解压文件中的lib包。

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