全國(guó)統(tǒng)一招生熱線
0755-86191118
作為Android應(yīng)用開發(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開始我們可以看到在android-sdk-windows\tools\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\tools\lib\proguard.cfg的內(nèi)容：
-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
}
-keepclasseswithmembernames class * {
public
}
-keepclasseswithmembernames class * {
public
}
-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
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變量名及類名，所有類中部分以設(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
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：
# 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)該類似于下面的效果，是很難看懂的：
