Android Studio 打包成jar文件并混淆代码

在Studio中混淆打包需要修改模块下的build.gradle文件和proguard-rules.pro文件

1：首先修改指定模块的build.gradle文件，在末尾加上下述代码

task makeJar(type: proguard.gradle.ProGuardTask, dependsOn: "build") {
    //删除之前编译混淆jar包
    delete'build/outputs/jar/SystemInfo.jar'
    // 未混淆的jar
    injars 'build/intermediates/bundles/release/classes.jar'
    // 混淆后的jar路径
    outjars 'build/outputs/jar/SystemInfo.jar'
    // 混淆文件
    configuration 'proguard-rules.pro'
}

说明：AS会自动对模块进行打包，即build/intermediates/bundles/release/classes.jar，只是未进行混淆工作而已；

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# no longer maintained.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 ;
}

# 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）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

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 com.csdn.info.**{*;}

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！

4：jar包路径

你的Module/build/outputs/jar/SystemInfo.jar（你的jar包名称）