因爲各類反編譯工具的泛濫,做爲Android程序員在2.3版本之前只能經過手動添加proguard來實現代碼混淆 java
proguard這個工具是一個java代碼混淆的工具 android
在2.3版本的sdk中 咱們能夠看到在android-sdk-windows/tools/下面多了一個proguard文件夾 程序員
google已經把proguard技術放在了android sdk裏面 能夠經過正常的編譯方式也能實現代碼混淆了 windows
能夠看見新建一個工程裏面有default.properties和proguard.cfg app
默認的default.properties代碼以下 ide
- # 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
咱們能夠看到proguard.cfg已經幫咱們寫好了優化代碼腳本 函數
- -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 *;
- }
從腳本中能夠看到,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 工具
並保留了全部的Native變量名及類名,全部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。) 優化
接下來 按照google幫助文檔裏說的 ui
- 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.
因此咱們修改default.properties file
加上一句
proguard.config=proguard.cfg
以下
- # 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
而後正常的編譯簽名便可
而後用Android Tools生成一個發佈的apk便可
而後用反編譯工具查看dex文件
最後導出反編譯以後的混淆代碼以下圖
是否是很輕鬆加愉快!但願各位程序員都能保護好本身的Android代碼!