Question

android中如何防止代码被反编译

Answer 1

Google似乎也发现了这个问题，从SDK2.3开始我们可以看到在android-sdk-windows\tools\下面多了一个proguard文件夹 proguard是一个java代码混淆的工具，通过proguard，别人即使反编译你的apk包，也只会看到一些让人很难看懂的代码，从而达到保护代码的作用。 -optimizationpasses 5 -dontusemixedcaseclassnames -dontskipnonpubliclibraryclasses -dontpreverify-verbose-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*�0�2-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�0�2-keepclasseswithmembernames class * { �0�2 �0�2 native <methods;}�0�2-keepclasseswithmembernames class * { �0�2 �0�2 public <init(android.content.Context, android.util.AttributeSet);}�0�2-keepclasseswithmembernames class * { �0�2 �0�2 public <init(android.content.Context, android.util.AttributeSet, int);}�0�2-keepclassmembers enum * { �0�2 �0�2 public static **[] values(); �0�2 �0�2 public static ** valueOf(java.lang.String);}�0�2-keep class * implements android.os.Parcelable { �0�2 public static final android.os.Parcelable$Creator *;}从脚本中可以看到，混淆中保留了继承自Activity、Service、Application、BroadcastReceiver、ContentProvider等基本组件以及com.android.vending.licensing.ILicensingService，并保留了所有的Native变量名及类名，所有类中部分以设定了固定参数格式的构造函数，枚举等等。(详细信息请参考<proguard_path/examples中的例子及注释。) 让proguard.cfg起作用的做法很简单，就是在eclipse自动生成的default.properties文件中加上一句“proguard.config=proguard.cfg”就可以了 完整的default.properties文件应该如下： # 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. �0�2# Project target. target=android-9 大功告成，正常的编译签名后就可以防止代码被反编译了。