1.首先需要在app下的build.gradle下配置，true表示编译时会混淆代码\

Paste_Image.png Paste_Image.png

2.在proguard-rules.pro中配置，android常用的混淆配置

对于一些基本指令的添加############################################### 代码混淆压缩比，在0~7之间，默认为5，一般不做修改

-optimizationpasses 5

混合时不使用大小写混合，混合后的类名为小写

-dontusemixedcaseclassnames

指定不去忽略非公共库的类

-dontskipnonpubliclibraryclasses

这句话能够使我们的项目混淆后产生映射文件# 包含有类名->混淆后类名的映射关系

-verbose

指定不去忽略非公共库的类成员

-dontskipnonpubliclibraryclassmembers

不做预校验，preverify是proguard的四个步骤之一，Android不需要preverify，去掉这一步能够加快混淆速度。

-dontpreverify

保留Annotation不混淆

-keepattributes Annotation,InnerClasses

避免混淆泛型

-keepattributes Signature

抛出异常时保留代码行号

-keepattributes SourceFile,LineNumberTable

指定混淆是采用的算法，后面的参数是一个过滤器

这个过滤器是谷歌推荐的算法，一般不做更改

-optimizations !code/simplification/cast,!field/,!class/merging/
############################################### Android开发中一些需要保留的公共部分############################################### 保留我们使用的四大组件，自定义的Application等等这些类不被混淆# 因为这些子类都有可能被外部调用
-keep public class * extends android.app.Activity
-keep public class * extends android.app.Appliction
-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

保留support下的所有类及其内部类

-keep class android.support.** {*;}

保留继承的

-keep public class * extends android.support.v4.**
-keep public class * extends android.support.v7.**
-keep public class * extends android.support.annotation.**

保留R下面的资源

-keep class .R$ {;}

保留本地native方法不被混淆

-keepclasseswithmembernames class * { native <methods>;}

保留在Activity中的方法参数是view的方法，

这样以来我们在layout中写的onClick就不会被影响-keepclassmembers class * extends android.app.Activity{ public void *(android.view.View);}

保留枚举类不被混淆

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

保留我们自定义控件（继承自View）不被混淆

-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);}

保留Parcelable序列化类不被混淆

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

保留Serializable序列化的类不被混淆

-keepclassmembers class * implements java.io.Serializable { static final long serialVersionUID; private static final java.io.ObjectStreamField[] serialPersistentFields; !static !transient <fields>; !private <fields>; !private <methods>; private void writeObject(java.io.ObjectOutputStream); private void readObject(java.io.ObjectInputStream); java.lang.Object writeReplace(); java.lang.Object readResolve();}

对于带有回调函数的onXXEvent、*OnListener的，不能被混淆

-keepclassmembers class * { void (OnEvent); void (OnListener);}

webView处理，项目中没有使用到webView忽略即可

-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);
}

移除Log类打印各个等级日志的代码，打正式包的时候可以做为禁log使用，这里可以作为禁止log打印的功能使用

记得proguard-android.txt中一定不要加-dontoptimize才起作用

另外的一种实现方案是通过BuildConfig.DEBUG的变量来控制

-assumenosideeffects class android.util.Log {

public static int v(...);
public static int i(...);
public static int w(...);
public static int d(...);
public static int e(...);

某个包下的类不用混淆

-------------处理本应用不需要混淆的代码-------------------

keep class com.android.smarttouch.ctrl.** { *; }

网络上有许多混淆规则的代码，看官方文档最好：gradle example，这里面有对各种sdk和library混淆时候时已经写好的混淆代码，直接去抄里面的示例代码就好。混淆时最麻烦的几点就是：
第三方lib包的混淆（不再有警告提醒）比如对apache的common包，dom4j的混淆，可以不用混淆
##############################################
不警告
-dontwarn org.dom4j.**

不混淆

-keep class org.dom4j.** { ; }
-dontwarn org.apache.*
-keep class org.apache.** { ; }
-dontwarn org.xmlpull.*
-keep class org.xmlpull.** { ; }
-dontwarn com.jcraft.*
-keep class com.jcraft.** { *; }

3.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）

4.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。

5.示例：

---------------------------------1.实体类---------------------------------

-keep class com.package.bean.** { *; }

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---------------------------------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.ArrayQueueField* {
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.*{;}

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---------------------------------3.与js互相调用的类------------------------

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---------------------------------4.反射相关的类和方法-----------------------

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-------------------------------------------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

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---------------------------------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 (OnEvent);
}

-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 *;
}

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---------------------------------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);
}

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