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。