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8 作為Android應(yīng)用開(kāi)發(fā)者，不得不面對(duì)一個(gè)尷尬的局面，就是自己辛辛苦苦開(kāi)發(fā)的應(yīng)用可以被別人很輕易的就反編譯出來(lái)。 Google似乎也發(fā)現(xiàn)了這個(gè)問(wèn)題，從SDK2.3開(kāi)始我們可以看到在android-sdk-windows ools下面多了一個(gè)proguard文件夾 proguard是一個(gè)java代碼混淆的工具，通過(guò)proguard，別人即使反編譯你的apk包，也只會(huì)看到一些讓人很難看懂的代碼，從而達(dá)到保護(hù)代碼的作用。 下面具體說(shuō)一說(shuō)怎么樣讓SDK2.3下的proguard.cfg文件起作用，先來(lái)看看android-sdk-windows oolslib的內(nèi)容：
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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 * extends android.app.backup.BackupAgentHelper -keep public class * extends android.preference.Preference -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$Creator *; }
-optimizationpasses 5-dontusemixedcaseclassnames-dontskipnonpubliclibraryclasses-dontpreverify-verbose-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*-keep public class * extends android.app.Activity-keep public class * extends android.app.Application-keep public class * extends android.app.Service-keep public class * extends android.content.BroadcastReceiver-keep public class * extends android.content.ContentProvider-keep public class * extends android.app.backup.BackupAgentHelper-keep public class * extends android.preference.Preference-keep public class com.android.vending.licensing.ILicensingService-keepclasseswithmembernames class * { native <methods>;}-keepclasseswithmembernames class * { public <init>(android.content.Context, android.util.AttributeSet);}-keepclasseswithmembernames class * { public <init>(android.content.Context, android.util.AttributeSet, int);}-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String);}-keep class * implements android.os.Parcelable { public static final android.os.Parcelable$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， 并保留了所有的Native變量名及類(lèi)名，所有類(lèi)中部分以設(shè)定了固定參數(shù)格式的構(gòu)造函數(shù)，枚舉等等。(詳細(xì)信息請(qǐng)參考<proguard_path>/examples中的例子及注釋。) 讓proguard.cfg起作用的做法很簡(jiǎn)單，就是在eclipse自動(dòng)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文件應(yīng)該如下：
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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-9proguard.config=proguard.cfg
大功告成，正常的編譯簽名后就可以防止代碼被反編譯了。反編譯經(jīng)過(guò)代碼混淆的apk得到的代碼應(yīng)該類(lèi)似于下面的效果，是很難看懂的：
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發(fā)表于 2013-8-28 16:29
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