android studio代码混淆注意问题

Java 是一种跨平台的、解释型语言，Java 源代码编译成中间”字节码”存储于 class 文件中。由于跨平台的需要，Java 字节码中包括了很多源代码信息，如变量名、方法名，并且通过这些名称来访问变量和方法，这些符号带有许多语义信息，很容易被反编译成 Java 源代码。为了防止这种现象，我们可以使用 Java 混淆器对 Java 字节码进行混淆。

语法

-include {filename}    从给定的文件中读取配置参数 -basedirectory {directoryname}    指定基础目录为以后相对的档案名称 -injars {class_path}    指定要处理的应用程序jar,war,ear和目录 -outjars {class_path}    指定处理完后要输出的jar,war,ear和目录的名称 -libraryjars {classpath}    指定要处理的应用程序jar,war,ear和目录所需要的程序库文件 -dontskipnonpubliclibraryclasses    指定不去忽略非公共的库类。 -dontskipnonpubliclibraryclassmembers    指定不去忽略包可见的库类的成员。保留选项 -keep {Modifier} {class_specification}    保护指定的类文件和类的成员 -keepclassmembers {modifier} {class_specification}    保护指定类的成员，如果此类受到保护他们会保护的更好-keepclasseswithmembers {class_specification}    保护指定的类和类的成员，但条件是所有指定的类和类成员是要存在。 -keepnames {class_specification}    保护指定的类和类的成员的名称（如果他们不会压缩步骤中删除） -keepclassmembernames {class_specification}    保护指定的类的成员的名称（如果他们不会压缩步骤中删除） -keepclasseswithmembernames {class_specification}    保护指定的类和类的成员的名称，如果所有指定的类成员出席（在压缩步骤之后） -printseeds {filename}    列出类和类的成员-keep选项的清单，标准输出到给定的文件 压缩 -dontshrink    不压缩输入的类文件 -printusage {filename} -dontwarn   如果有警告也不终止-whyareyoukeeping {class_specification}     优化 -dontoptimize    不优化输入的类文件 -assumenosideeffects {class_specification}    优化时假设指定的方法，没有任何副作用 -allowaccessmodification    优化时允许访问并修改有修饰符的类和类的成员 混淆 -dontobfuscate    不混淆输入的类文件 -printmapping {filename} -applymapping {filename}    重用映射增加混淆 -obfuscationdictionary {filename}    使用给定文件中的关键字作为要混淆方法的名称 -overloadaggressively    混淆时应用侵入式重载 -useuniqueclassmembernames    确定统一的混淆类的成员名称来增加混淆 -flattenpackagehierarchy {package_name}    重新包装所有重命名的包并放在给定的单一包中 -repackageclass {package_name}    重新包装所有重命名的类文件中放在给定的单一包中 -dontusemixedcaseclassnames    混淆时不会产生形形色色的类名 -keepattributes {attribute_name,...}    保护给定的可选属性，例如LineNumberTable, LocalVariableTable, SourceFile, Deprecated, Synthetic, Signature, and InnerClasses. -renamesourcefileattribute {string}    设置源文件中给定的字符串常量
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不能混淆的代码

顾名思义，不能混淆代码如果被混淆了，就会出现错误。

1. 需要反射的代码
2. 系统接口
3. Jni接口
4. 需要序列号和反序列化的代码（即实现Serializable接口的JavaBean）
5. 与服务端进行元数据交互的JavaBean（JSON、XML中对应的类）

常见错误

1) Proguard returned with error code 1. See console

更新proguard版本 
android-support-v4 不进行混淆 
添加缺少相应的库

2) 使用gson包解析数据时，出现 missing type parameter 异常

在 proguard-project.txt 中添加 
-dontobfuscate 
-dontoptimize 
在 proguard-project.txt 中添加 
# removes such information by default, so configure it to keep all of it. 
-keepattributes Signature 
# Gson specific classes 
-keep class sun.misc.Unsafe { *; } 
#-keep class com.google.gson.stream.* { ; } 
# Application classes that will be serialized/deserialized over Gson 
-keep class com.google.gson.examples.android.model.* { ; }

3) 类型转换错误

在 proguard-project.txt 中添加 
-keepattributes Signature

4) 空指针异常

混淆过滤掉相关类与方法

5) java.lang.reflect.UndeclaredThrowableException

-keep interface com.dev.impl.**

6) Error: Unable to access jarfile ..libproguard.jar

路径问题

7) java.lang.NoSuchMethodError

这也是最常见的问题，因为找不到相关方法，方法被混淆了，混淆过滤掉相关方法便可。

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下面是我实际项目中的混淆配置：

#---------------------------------1.实体类----------------------------------keep class com.package.bean.** { *; }#-------------------------------------------------------------------------#---------------------------------2.第三方包-------------------------------#eventBus-keepattributes *Annotation*-keepclassmembers class ** {    @org.greenrobot.eventbus.Subscribe <methods>;}-keep enum org.greenrobot.eventbus.ThreadMode { *; }-keepclassmembers class * extends org.greenrobot.eventbus.util.ThrowableFailureEvent {    <init>(java.lang.Throwable);}#glide-keep public class * implements com.bumptech.glide.module.GlideModule-keep public enum com.bumptech.glide.load.resource.bitmap.ImageHeaderParser$** {  **[] $VALUES;  public *;}-keep class com.bumptech.glide.** { *; }#retrofit2-dontwarn retrofit2.**-keep class retrofit2.** { *; }-keepattributes Signature-keepattributes Exceptions-dontwarn org.robovm.**-keep class org.robovm.** { *; }#okhttp3-dontwarn com.squareup.okhttp3.**-keep class com.squareup.okhttp3.** { *;}-keep class okhttp3.** { *;}-keep class okio.** { *;}-dontwarn sun.security.**-keep class sun.security.** { *;}-dontwarn okio.**-dontwarn okhttp3.**#rxjava-dontwarn rx.**-keep class rx.** { *; }-dontwarn sun.misc.**-keepclassmembers class rx.internal.util.unsafe.*ArrayQueue*Field* { long producerIndex; long consumerIndex;}-keepclassmembers class rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef { rx.internal.util.atomic.LinkedQueueNode producerNode;}-keepclassmembers class rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef { rx.internal.util.atomic.LinkedQueueNode consumerNode;}#baidu-keep class com.baidu.** { *; }-dontwarn com.baidu.**#alipay-keep class com.alipay.android.app.IAlixPay{*;}-keep class com.alipay.android.app.IAlixPay$Stub{*;}-keep class com.alipay.android.app.IRemoteServiceCallback{*;}-keep class com.alipay.android.app.IRemoteServiceCallback$Stub{*;}-keep class com.alipay.sdk.app.PayTask{ public *;}-keep class com.alipay.sdk.app.AuthTask{ public *;}-keep class com.alipay.mobilesecuritysdk.*-keep class com.ut.*-dontwarn android.net.**-keep class android.net.** { *; }#gson-keep class com.google.gson.** {*;}#-keep class com.google.**{*;}-keep class sun.misc.Unsafe { *; }-keep class com.google.gson.stream.** { *; }-keep class com.google.gson.examples.android.model.** { *; }-keep class com.google.** {    <fields>;    <methods>;}-keepclassmembers class * implements java.io.Serializable {    static final long serialVersionUID;    private static final java.io.ObjectStreamField[] serialPersistentFields;    private void writeObject(java.io.ObjectOutputStream);    private void readObject(java.io.ObjectInputStream);    java.lang.Object writeReplace();    java.lang.Object readResolve();}-dontwarn com.google.gson.**#umeng-dontwarn com.umeng.**-keep class com.umeng.**{*;}-keep class u.aly.**{*;}-keep class com.google.**{*;}#butterknife-keep class butterknife.** { *; }-dontwarn butterknife.internal.**-keep class **$$ViewBinder { *; }-keepclasseswithmembernames class * {    @butterknife.* <fields>;}-keepclasseswithmembernames class * {    @butterknife.* <methods>;}#pinyin4j-dontwarn net.soureceforge.pinyin4j.**-dontwarn demo.**-libraryjars src/libs/pinyin4j-2.5.0.jar-keep class net.sourceforge.pinyin4j.** { *;}-keep class demo.** { *;}-keep class com.hp.** { *;}#httpclient (org.apache.http.legacy.jar)-dontwarn android.net.compatibility.**-dontwarn android.net.http.**-dontwarn com.android.internal.http.multipart.**-dontwarn org.apache.commons.**-dontwarn org.apache.http.**-dontwarn org.apache.http.protocol.**-keep class android.net.compatibility.**{*;}#-keep class android.net.http.**{*;}-keep class com.android.internal.http.multipart.**{*;}-keep class org.apache.commons.**{*;}-keep class org.apache.org.**{*;}-keep class org.apache.harmony.**{*;}#lib-wheel-dontwarn kankan.wheel.**-keep class kankan.wheel.**{*;}#PhotoPicker-dontwarn me.iwf.photopicker.**-keep class me.iwf.photopicker.**{*;}#nineoldandroids-dontwarn com.nineoldandroids.*-keep class com.nineoldandroids.** { *;}#weixin-dontwarn com.tencent.mm.**-keep class com.tencent.mm.**{*;}#topsnackbar-dontwarn com.androidadvance.topsnackbar.**-keep class com.androidadvance.topsnackbar.**{*;}#pull_recyclerview_library-dontwarn com.cundong.recyclerview.**-keep class com.cundong.recyclerview.**{*;}#-------------------------------------------------------------------------#---------------------------------3.与js互相调用的类------------------------#-------------------------------------------------------------------------#---------------------------------4.反射相关的类和方法-----------------------#----------------------------------------------------------------------------#-------------------------------------------基本不用动区域--------------------------------------------#---------------------------------基本指令区-----------------------------------optimizationpasses 5-dontskipnonpubliclibraryclassmembers-printmapping proguardMapping.txt-optimizations !code/simplification/cast,!field/*,!class/merging/*-keepattributes *Annotation*,InnerClasses-keepattributes Signature-keepattributes SourceFile,LineNumberTable#-ignorewarnings#----------------------------------------------------------------------------#---------------------------------默认保留区----------------------------------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 * extends android.view.View-keep public class com.android.vending.licensing.ILicensingService-keep class android.support.** {*;}-keep public class * extends android.os.IInterface-keep public class * extends android.view.View{    *** get*();    void set*(***);    public <init>(android.content.Context);    public <init>(android.content.Context, android.util.AttributeSet);    public <init>(android.content.Context, android.util.AttributeSet, int);}-keepclasseswithmembers class * {    public <init>(android.content.Context, android.util.AttributeSet);    public <init>(android.content.Context, android.util.AttributeSet, int);}-keepclassmembers class * implements java.io.Serializable {    static final long serialVersionUID;    private static final java.io.ObjectStreamField[] serialPersistentFields;    private void writeObject(java.io.ObjectOutputStream);    private void readObject(java.io.ObjectInputStream);    java.lang.Object writeReplace();    java.lang.Object readResolve();}-keep class **.R$* { *;}-keepclassmembers class * {    void *(**On*Event);}-keepclasseswithmembernames class * { # 保持 native 方法不被混淆 native <methods>;}-keepclasseswithmembers class * { # 保持自定义控件类不被混淆 public <init>(android.content.Context, android.util.AttributeSet);}-keepclasseswithmembers class * {# 保持自定义控件类不被混淆 public <init>(android.content.Context, android.util.AttributeSet, int);}-keepclassmembers class * extends android.app.Activity { # 保持自定义控件类不被混淆 public void *(android.view.View);}-keepclassmembers enum * { # 保持枚举 enum 类不被混淆 public static **[] values(); public static ** valueOf(java.lang.String);}-keep class * implements android.os.Parcelable { # 保持 Parcelable 不被混淆 public static final android.os.Parcelable$Creator *;}#----------------------------------------------------------------------------#---------------------------------webview-------------------------------------keepclassmembers class fqcn.of.javascript.interface.for.webview {   public *;}-keepclassmembers class * extends android.webkit.webViewClient {    public void *(android.webkit.WebView, java.lang.String, android.graphics.Bitmap);    public boolean *(android.webkit.WebView, java.lang.String);}-keepclassmembers class * extends android.webkit.webViewClient {    public void *(android.webkit.webView, jav.lang.String);}#----------------------------------------------------------------------------#---------------------------------------------------------------------------------------------------