【轉載自： http://blog.csdn.net/zengyangtech/article/details/6127600】
由於各種反編譯工具的泛濫，作爲Android程序員在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文件夾
google已經把proguard技術放在了android sdk裏面 可以通過正常的編譯方式也能實現代碼混淆了
可以看見新建一個工程裏面有default.properties和proguard.cfg
默認的default.properties代碼如下
- # 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已經幫我們寫好了優化代碼腳本
- -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 *;
- }
從腳本中可以看到，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變量名及類名，所有類中部分以設定了固定參數格式的構造函數，枚舉等等。(詳細信息請參考<proguard_path>/examples中的例子及註釋。)
接下來 按照google幫助文檔裏說的
- 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
- # 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生成一個發佈的apk即可
然後用反編譯工具查看dex文件
最後導出反編譯之後的混淆代碼如下圖
是不是很輕鬆加愉快!希望各位程序員都能保護好自己的Android代碼!