Android 2.3 代碼混淆proguard技術介紹 收藏

由於各種反編譯工具的泛濫，作為Android程式員在2.3版本以前只能通過手動添加proguard來實現代碼混淆

proguard這個工具是一個java代碼混淆的工具

在2.3版本的sdk中 我們可以看到在android-sdk-windows/tools/下面多了一個proguard檔案夾

google已經把proguard技術放在了android sdk裡面 可以通過正常的編譯方式也能實現代碼混淆了

 

可以看見建立一個工程裡面有default.properties和proguard.cfg

預設的default.properties代碼如下

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# 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 use, 
# "build.properties", and override values to adapt the script to your 
# project structure. 
# Project target.  
target=android-9 
# 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 use,
# "build.properties", and override values to adapt the script to your
# project structure.
# Project target.
target=android-9
 

我們可以看到proguard.cfg已經幫我們寫好了最佳化代碼指令碼

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-optimizationpasses 5  
-dontusemixedcaseclassnames  
-dontskipnonpubliclibraryclasses  
-dontpreverify  
-verbose  
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*  
-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 com.android.vending.licensing.ILicensingService  
-keepclasseswithmembernames class * {  
    native <methods>;  
}  
-keepclasseswithmembernames class * {  
    public <init>(android.content.Context, android.util.AttributeSet);  
}  
-keepclasseswithmembernames class * {  
    public <init>(android.content.Context, android.util.AttributeSet, int);  
}  
-keepclassmembers enum * {  
    public static **[] values();  
    public static ** valueOf(java.lang.String);  
}  
-keep class * implements android.os.Parcelable {  
  public static final android.os.Parcelable$Creator *;  
} 
-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider
-keep public class com.android.vending.licensing.ILicensingService
-keepclasseswithmembernames class * {
    native <methods>;
}
-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}
-keepclasseswithmembernames class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}
-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}
 

從指令碼中可以看到，混淆中保留了繼承自Activity、Service、Application、BroadcastReceiver、ContentProvider等基本組件以及com.android.vending.licensing.ILicensingService

並保留了所有的Native變數名及類名，所有類中部分以設定了固定參數格式的建構函式，枚舉等等。(詳細資料請參考<proguard_path>/examples中的例子及注釋。)

接下來 按照google協助文檔裡說的

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To enable ProGuard so that it runs as part of an Ant or Eclipse build, set the proguard.config property in the <project_root>/default.properties file. The path can be an absolute path or a path relative to the project's root. 
To enable ProGuard so that it runs as part of an Ant or Eclipse build, set the proguard.config property in the <project_root>/default.properties file. The path can be an absolute path or a path relative to the project's root.

所以我們修改default.properties file

加上一句

proguard.config=proguard.cfg

如下

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# 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 use, 
# "build.properties", and override values to adapt the script to your 
# project structure. 
# Project target.  
target=android-9  
proguard.config=proguard.cfg 
# 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 use,
# "build.properties", and override values to adapt the script to your
# project structure.
# Project target.
target=android-9
proguard.config=proguard.cfg
 

然後正常的編譯簽名即可

然後用Android Tools產生一個發布的apk即可

 

然後用反編譯工具查看dex檔案

最後匯出反編譯之後的混淆代碼如

 

是不是很輕鬆加愉快!希望各位程式員都能保護好自己的Android代碼!

 

本文來自CSDN部落格，轉載請標明出處：http://blog.csdn.net/Zengyangtech/archive/2011/01/10/6127600.aspx