Android 打包混淆

Java代码编译成二进制class 文件，这个class 文件也可以反编译成源代码 ，除了注释外，原来的code 基本都可以看到。为了防止重要code 被泄露，我们往往需要混淆（Obfuscation code ， 也就是把方法，字段，包和类这些java 元素的名称改成无意义的名称，这样代码结构没有变化，还可以运行，但是想弄懂代码的架构却很难。

一、项目混淆过程中注意事项：

我的新建android项目下只有proguard-project.txt和project.properties这两个文件夹，而网上一些所谓混淆的方法不少是proguard.config和project.properties，以下是一些混淆总结：

1、如果是proguard.config和project.properties这两个文件夹的则为：

proguard.config=proguard.cfg

如果是proguard-project.txt和project.properties这两个文件夹的则为：

proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt（当然视您生成项目时候该文件具体生成情况所定）。

2、如果有第三方libs包的话，则混淆时需要注意了，以下是常用的一些libs包的混淆配置：

1）、友盟sdk:

-libraryjars libs/umeng_sdk.jar

-keepclassmembers class * {

public (org.json.JSONObject);

}

-keep public class com.smile.android.R$*{

public static final int ;

}

2)、gson

-ibraryjars libs/gson-2.2.2.jar

-keep class sun.misc.Unsafe { *; }

-keep class com.google.gson.stream.* { ;
}

-keep class com.google.gson.examples.android.model.* { ;
}

-keep class com.google.gson.* { *;}

3)、support-v4包

-libraryjars libs/android-support-v4.jar

-dontwarn android.support.v4.**

-keep class android.support.v4.** { ;
}

4）、nineoldandroids动画lib包

-libraryjars libs/nineoldandroids-2.4.0.jar

-dontwarn com.nineoldandroids.*

-keep class com.nineoldandroids.** { *;}

注解：

-braryjars libs/nineoldandroids-2.4.0.jar----指明libs包的在工程中的路径

而-dontwarn com.xx.bbb.**和-keep class com.xx.bbb.** { ;}

这两个参数用来保持第三方库中的类而不乱，将-dontwarn和-keep 结合使用，意思是保持com.xx.bbb.*这个包里面的所有类和所有方法而不混淆，接着还叫ProGuard不要警告找不到com.xx.bbb.**这个包里面的类的相关引用。

project.properties源文件

# 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 edit
# "ant.properties", and override values to adapt the script to your
# project structure.
#
# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
#proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt

# Project target.
target=android-10

我的加混淆的project.properties文件

# 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 edit
# "ant.properties", and override values to adapt the script to your
# project structure.
#
# To enable ProGuard to shrink and obfuscate your code, uncomment this (available properties: sdk.dir, user.home):
proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt

# Project target.
target=android-10

proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt 去掉前面的注解符#

proguard-project.txt源文件

-optimizationpasses 5->设置混淆的压缩比率 0 ~ 7
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses->如果应用程序引入的有jar包,并且想混淆jar包里面的class
-dontpreverify
-verbose->混淆后生产映射文件 map 类名->转化后类名的映射
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*->混淆采用的算法.

-keep public class * extends android.app.Activity->所有activity的子类不要去混淆
-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>;-> 所有native的方法不能去混淆.
}

-keepclasseswithmembers class * {-->某些构造方法不能去混淆
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 * {-> 枚举类不能去混淆
public static **[] values();
public static ** valueOf(java.lang.String);
}

-keep class * implements android.os.Parcelable {-> aidl文件不能去混淆.
public static final android.os.Parcelable$Creator *;
}

我的加混淆的proguard-project.txt文件

# 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 *;
#}

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-dontoptimize
-ignorewarnings
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-keepattributes Signature

-dontskipnonpubliclibraryclassmembers
-dontskipnonpubliclibraryclasses

-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 *;
}

-keep public class com.smile.android.R$*{
public static final *;
}

-libraryjars libs/android-support-v4.jar
-dontwarn android.support.v4.**
-keep class android.support.v4.** { *; }

-libraryjars libs/alipaysdk.jar
-dontwarn com.alipay.**
-keep class com.alipay.** { *; }

-libraryjars libs/alipaysecsdk.jar
-dontwarn com.alipay.mobilesecuritysdk.**
-keep class com.alipay.mobilesecuritysdk.** { *; }
-dontwarn HttpUtils.**
-keep class HttpUtils.** { *; }

-libraryjars libs/alipayutdid.jar
-dontwarn com.**
-keep class com.** { *; }

-libraryjars libs/universal-image-loader-1.9.1-with-sources.jar
-dontwarn com.nostra13.universalimageloader.**
-keep class com.nostra13.universalimageloader.** { *; }

然后打包就ok了

这是简单的，凡事往往没想象的简单，具体问题遇到再说吧。