Android之如何混淆代码和相关配置

昨天，客户想看一下目前项目开发到什么程度了，于是需要将项目签名打包成apk，结果打包的时候出错了，吃惊，什么情况。等成功打包以后，安装起来发现部分功能又报错了，囧，所幸最后还是解决了。在这里记录一下遇到的错误和解决方法。

1.如何混淆

将代码混淆起来，这样可以防止在apk被人反编译后而被别人直接看到源码，混淆方法很简单，当我们创建好项目时，已经自动为我们生成了混淆文件，老版的ADT生成的是proguard.cfg文件，而新版的ADT则是以proguard-project.txt替代了它。两则配置方法一致，只要在project.properties文件中引入就好。前者是将project.properties的“#  proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt”的“#”去掉就可以了，后者加入一句proguard.config=proguard.cfg即可。

2.如何防止第三方jar包混淆

我使用的混淆文件是proguard.cfg。

开头提到的第一个打包失败的原因是因为引入了第三方jar包。

所报错误如下

  Proguard returned with error code 1. See console
  Note: there were 1465 duplicate class definitions.
  Warning: library class android.net.http.AndroidHttpClient extends or implements program class org.apache.http.client.HttpClient
  Warning: org.apache.http.client.protocol.RequestAddCookies: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.RequestAddCookies: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.RequestAuthCache: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.RequestAuthCache: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.RequestAuthenticationBase: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.RequestAuthenticationBase: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.RequestClientConnControl: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.RequestClientConnControl: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.ResponseAuthCache: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.ResponseAuthCache: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.ResponseProcessCookies: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.client.protocol.ResponseProcessCookies: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.auth.BasicScheme: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.BasicScheme: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSManager
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSName
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSManager
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSName
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSManager
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSContext
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSContext
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSContext
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSManager
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSName
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSContext
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSManager
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSManager
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSName
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSContext
  Warning: org.apache.http.impl.auth.GGSSchemeBase: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.KerberosScheme: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.KerberosScheme: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.KerberosScheme: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.NTLMEngineImpl$NTLMMessage: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.NTLMEngineImpl$NTLMMessage: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.NTLMEngineImpl$NTLMMessage: can't find referenced class org.apache.commons.codec.binary.Base64
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.auth.NegotiateScheme: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.SPNegoScheme: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.SPNegoScheme: can't find referenced class org.ietf.jgss.Oid
  Warning: org.apache.http.impl.auth.SPNegoScheme: can't find referenced class org.ietf.jgss.GSSException
  Warning: org.apache.http.impl.client.AbstractAuthenticationHandler: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AbstractAuthenticationHandler: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AbstractHttpClient: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AbstractHttpClient: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AuthenticationStrategyAdaptor: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AuthenticationStrategyAdaptor: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AuthenticationStrategyImpl: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AuthenticationStrategyImpl: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AutoRetryHttpClient: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.AutoRetryHttpClient: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.DefaultRedirectHandler: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.DefaultRedirectHandler: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.DefaultRedirectStrategy: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.DefaultRedirectStrategy: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.DefaultRequestDirector: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.DefaultRequestDirector: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.HttpAuthenticator: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.client.HttpAuthenticator: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.BasicClientConnectionManager: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.BasicClientConnectionManager: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultClientConnection: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultClientConnection: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultClientConnection: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultClientConnectionOperator: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultClientConnectionOperator: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultHttpResponseParser: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultHttpResponseParser: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultResponseParser: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.DefaultResponseParser: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.IdleConnectionHandler: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.IdleConnectionHandler: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.InMemoryDnsResolver: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.InMemoryDnsResolver: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.PoolingClientConnectionManager: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.PoolingClientConnectionManager: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.SingleClientConnManager: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.SingleClientConnManager: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.AbstractConnPool: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.AbstractConnPool: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.ConnPoolByRoute: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.ConnPoolByRoute: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.RouteSpecificPool: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.RouteSpecificPool: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager: can't find referenced class org.apache.commons.logging.LogFactory
  Warning: org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager: can't find referenced class org.apache.commons.logging.LogFactory
        You should check if you need to specify additional program jars.
  Warning: there were 104 unresolved references to classes or interfaces.
           You may need to specify additional library jars (using '-libraryjars').
  Warning: there were 1 instances of library classes depending on program classes.
           You must avoid such dependencies, since the program classes will
           be processed, while the library classes will remain unchanged.
  java.io.IOException: Please correct the above warnings first.
      at proguard.Initializer.execute(Initializer.java:321)
      at proguard.ProGuard.initialize(ProGuard.java:211)
      at proguard.ProGuard.execute(ProGuard.java:86)
      at proguard.ProGuard.main(ProGuard.java:492)

解决方法很简单，就是在proguard.cfg中加入句-dontwarn即可。

第二个运行时报错，我用真机调试查看了下LogCat日志输出，发现报的错误是找不到资源，而报错地方是引入第三方jar的时候，原来是混淆时将第三方jar包也混淆了,那么只要不混淆第三方jar就可以吧。

以下是我最后的proguard.cfg配置。

 -keep class **.R$* {   *;  }//不混淆R文件
 -optimizationpasses 5
 -dontusemixedcaseclassnames
 -dontskipnonpubliclibraryclasses
 -dontpreverify
 -ignorewarnings
 -verbose
 -optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

 //不混淆的jar包，脚本中去掉该句
 -libraryjars libs/jar包名称

 -dontwarn//不警告,脚本中去掉该句
 -dontskipnonpubliclibraryclassmembers

 -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>;
 }

 -keepclasseswithmembers class * {
     public <init>(android.content.Context, android.util.AttributeSet);
 }

 -keepclasseswithmembers class * {
     public <init>(android.content.Context, android.util.AttributeSet, int);
 }

 -keepclassmembers class * extends android.app.Activity {
    public void *(android.view.View);
 }

 -keepclassmembers enum * {
     public static **[] values();
     public static ** valueOf(java.lang.String);
 }

 -keep class * implements android.os.Parcelable {
   public static final android.os.Parcelable$Creator *;
 }

 //不混淆某包中的指定内容,脚本中去掉该句
 -keep class 包名.** {*;}

至此，就ok了