在Android Studio当中混淆APK实在是太简单了，借助SDK中自带的Proguard工具，只需要修改app module 下的build.gradle中的一行配置即可。可以看到，现在build.gradle中minifyEnabled的值是false，这里我们只需要把值改成true，编译出来的APK包就会是混淆过的了。如下所示：
其中：
minifyEnabled用于设置是否启用混淆；
shrinkResources用于设置删除无效的Resources，shrinkResources依赖于minifyEnabled，必须一起使用；
proguardFiles用于选定混淆配置文件。注意这里是在release闭包内进行配置的，因此只有编译出正式版的APK才会进行混淆，Debug版的APK是不会混淆的。当然这也是非常合理的，因为Debug版的APK文件我们只会用来内部测试，不用担心被人破解。
proguard-android.txt混淆配置文件，该文件存放于android studio的sdk目录下androidsdk\tools\proguard，打开文件如下：
# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-verbose
# Optimization is turned off by default. Dex does not like code run
# through the ProGuard optimize and preverify steps (and performs some
# of these optimizations on its own).
-dontoptimize
-dontpreverify
# Note that if you want to enable optimization, you cannot just
# include optimization flags in your own project configuration file;
# instead you will need to point to the
# "proguard-android-optimize.txt" file instead of this one from your
# project.properties file.
-keepattributes *Annotation*
-keep public class com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService
# For native methods, see http://proguard.sourceforge.net/manual/examples.html#native
-keepclasseswithmembernames class * {
native ;
}
# keep setters in Views so that animations can still work.
# see http://proguard.sourceforge.net/manual/examples.html#beans
-keepclassmembers public class * extends android.view.View {
void set*(***);
*** get*();
}
# We want to keep methods in Activity that could be used in the XML attribute onClick
-keepclassmembers class * extends android.app.Activity {
public void *(android.view.View);
}
# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
-keepclassmembers enum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
-keepclassmembers class * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator CREATOR;
}
-keepclassmembers class **.R$* {
public static ;
}
# The support library contains references to newer platform versions.
# Don't warn about those in case this app is linking against an older
# platform version. We know about them, and they are safe.
-dontwarn android.support.**
# Understand the @Keep support annotation.
-keep class android.support.annotation.Keep
-keep @android.support.annotation.Keep class * {*;}
-keepclasseswithmembers class * {
@android.support.annotation.Keep ;
}
-keepclasseswithmembers class * {
@android.support.annotation.Keep ;
}
-keepclasseswithmembers class * {
@android.support.annotation.Keep (...);
}
我就问你 是不是感觉头很大，哈哈 别着急下面还有解释。
这个就是默认的混淆配置文件了，我们来一起逐行阅读一下。
好了，这就是proguard-android.txt文件中所有默认的配置，而我们混淆代码也是按照这些配置的规则来进行混淆的。经过我上面的讲解之后，相信大家对这些配置的内容基本都能理解了。
回到Android Studio项目当中，APK虽然已经成功混淆了，但是混淆的规则都是按照proguard-android.txt中默认的规则来的，当然我们也可以修改proguard-android.txt中的规则，但是直接在proguard-android.txt中修改会对我们本机上所有项目的混淆规则都生效，那么有没有什么办法只针对当前项目的混淆规则做修改呢？当然是有办法的了，你会发现任何一个Android Studio项目在app模块目录下都有一个proguard-rules.txt（proguard-rules.pro）文件，这个文件就是用于让我们编写只适用于当前项目的混淆规则的。自定义混淆通用模板如下：
#############################################
#
#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
-optimizationpasses5
#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
-keepattributesSignature
#抛出异常时保留代码行号
-keepattributesSourceFile,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
-keeppublic class * extends android.app.Activity
-keeppublic class * extends android.app.Appliction
-keeppublic class * extends android.app.Service
-keeppublic class * extends android.content.BroadcastReceiver
-keeppublic class * extends android.content.ContentProvider
-keeppublic class * extends android.app.backup.BackupAgentHelper
-keeppublic class * extends android.preference.Preference
-keeppublic class * extends android.view.View
-keeppublic class com.android.vending.licensing.ILicensingService
#保留support下的所有类及其内部类
-keepclass android.support.** {*;}
#保留继承的
-keeppublic class * extends android.support.v4.**
-keeppublic class * extends android.support.v7.**
-keeppublic class * extends android.support.annotation.**
#保留R下面的资源
-keepclass **.R$* {*;}
#保留本地native方法不被混淆
-keepclasseswithmembernamesclass * {
native ;
}
#保留在Activity中的方法参数是view的方法，
#这样以来我们在layout中写的onClick就不会被影响
-keepclassmembersclass * extends android.app.Activity{
public void *(android.view.View);
}
#保留枚举类不被混淆
-keepclassmembersenum * {
public static **[] values();
public static ** valueOf(java.lang.String);
}
#保留我们自定义控件（继承自View）不被混淆
-keeppublic class * extends android.view.View{
*** get*();
void set*(***);
public (android.content.Context);
public (android.content.Context, android.util.AttributeSet);
public (android.content.Context, android.util.AttributeSet, int);
}
#保留Parcelable序列化类不被混淆
-keepclass * implements android.os.Parcelable {
public static final android.os.Parcelable$Creator *;
}
#保留Serializable序列化的类不被混淆
-keepclassmembersclass * implements java.io.Serializable {
static final long serialVersionUID;
private static final java.io.ObjectStreamField[] serialPersistentFields;
!static !transient ;
!private ;
!private ;
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、**On*Listener的，不能被混淆
-keepclassmembersclass * {
void *(**On*Event);
void *(**On*Listener);
}
# webView处理，项目中没有使用到webView忽略即可
-keepclassmembersclass fqcn.of.javascript.interface.for.webview {
public *;
}
-keepclassmembersclass * extends android.webkit.webViewClient {
public void *(android.webkit.WebView, java.lang.String, android.graphics.Bitmap);
public boolean *(android.webkit.WebView, java.lang.String);
}
-keepclassmembersclass * 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(...);
#}
#############################################
#
#项目中特殊处理部分
#
#############################################
#-----------处理反射类---------------
#-----------处理js交互---------------
#-----------处理实体类---------------
#在开发的时候我们可以将所有的实体类放在一个包内，这样我们写一次混淆就行了。
#-keep public class com.ljd.example.entity.** {
# public void set*(***);
# public *** get*();
# public *** is*();
#}
#-----------处理第三方依赖库---------
下面介绍常用第三方混淆配置
#############################################
#
#处理第三方依赖库
#
#############################################
# AndroidEventBus
-keepclass org.simple.** {*;}
-keepinterface org.simple.** {*;}
-keepclassmembersclass * {
@org.simple.eventbus.Subscriber ;
}
#百度地图（jar包换成自己的版本，记得签名要匹配）
-libraryjarslibs/baidumapapi_v2_1_3.jar
-keepclass com.baidu.** {*;}
-keepclass vi.com.** {*;}
-keepclass com.sinovoice.** {*;}
-keepclass pvi.com.** {*;}
-dontwarncom.baidu.**
-dontwarnvi.com.**
-dontwarnpvi.com.**
# Bugly
-dontwarncom.tencent.bugly.**
-keepclass com.tencent.bugly.** {*;}
# ButterKnife
-keepclass butterknife.** {*;}
-dontwarnbutterknife.internal.**
-keepclass **$$ViewBinder {*;}
-keepclasseswithmembernamesclass * {
@butterknife.* ;
}
-keepclasseswithmembernamesclass * {
@butterknife.* ;
}
# EventBus
-keepattributes*Annotation*
-keepclassmembersclass ** {
@org.greenrobot.eventbus.Subscribe ;
}
-keepenum org.greenrobot.eventbus.ThreadMode {*;}
-keepclass com.facebook.** {*;}
-keepinterface com.facebook.** {*;}
-keepenum com.facebook.** {*;}
# FastJson
-dontwarncom.alibaba.fastjson.**
-keepclass com.alibaba.fastjson.** {*;}
-keepattributesSignature
-keepattributes*Annotation*
# Fresco
-keepclass com.facebook.fresco.** {*;}
-keepinterface com.facebook.fresco.** {*;}
-keepenum com.facebook.fresco.** {*;}
#高德相关依赖
#集合包:3D地图3.3.2导航1.8.0定位2.5.0
-dontwarncom.amap.api.**
-dontwarncom.autonavi.**
-keepclass com.amap.api.**{*;}
-keepclass com.autonavi.**{*;}
#地图服务
-dontwarncom.amap.api.services.**
-keepclass com.map.api.services.** {*;}
# 3D地图
-dontwarncom.amap.api.mapcore.**
-dontwarncom.amap.api.maps.**
-dontwarncom.autonavi.amap.mapcore.**
-keepclass com.amap.api.mapcore.**{*;}
-keepclass com.amap.api.maps.**{*;}
-keepclass com.autonavi.amap.mapcore.**{*;}
#定位
-dontwarncom.amap.api.location.**
-dontwarncom.aps.**
-keepclass com.amap.api.location.**{*;}
-keepclass com.aps.**{*;}
#导航
-dontwarncom.amap.api.navi.**
-dontwarncom.autonavi.**
-keepclass com.amap.api.navi.** {*;}
-keepclass com.autonavi.** {*;}
# Glide
-keeppublic class * implements com.bumptech.glide.module.GlideModule
-keeppublic enum com.bumptech.glide.load.resource.bitmap.ImageHeaderParser$** {
**[] $VALUES;
public *;
}
# Gson
-keepattributesSignature-keepattributes *Annotation*
-keepclass sun.misc.Unsafe {*;}
-keepclass com.google.gson.stream.** {*;}
#使用Gson时需要配置Gson的解析对象及变量都不混淆。不然Gson会找不到变量。
#将下面替换成自己的实体类
-keepclass com.example.bean.** {*;}
# Jackson
-dontwarnorg.codehaus.jackson.**
-dontwarncom.fasterxml.jackson.databind.**
-keepclass org.codehaus.jackson.** {*;}
-keepclass com.fasterxml.jackson.** {*;}
#极光推送
-dontoptimize
-dontpreverify
-dontwarncn.jpush.**
-keepclass cn.jpush.** {*;}
# OkHttp3
-dontwarncom.squareup.okhttp3.**
-keepclass com.squareup.okhttp3.** {*;}
-dontwarnokio.**
# Okio
-dontwarncom.squareup.**
-dontwarnokio.**
-keeppublic class org.codehaus.* {*;}
-keeppublic class java.nio.* {*;}
# OrmLite
-keepattributes*DatabaseField*
-keepattributes*DatabaseTable*
-keepattributes*SerializedName*
-keepclass com.j256.**
-keepclassmembersclass com.j256.** {*;}
-keepenum com.j256.**
-keepclassmembersenum com.j256.** {*;}
-keepinterface com.j256.**
-keepclassmembersinterface com.j256.** {*;}
# Realm
-keepclass io.realm.annotations.RealmModule
-keep@io.realm.annotations.RealmModule class *
-keepclass io.realm.internal.Keep
-keep@io.realm.internal.Keep class * {*;}
-dontwarnjavax.**
-dontwarnio.realm.**
# Retrofit
-dontwarnretrofit2.**
-keepclass retrofit2.** {*;}
-keepattributesSignature
-keepattributesExceptions
# Retrolambda
-dontwarnjava.lang.invoke.*
# RxJava RxAndroid
-dontwarnsun.misc.**
-keepclassmembersclass rx.internal.util.unsafe.*ArrayQueue*Field* {
long producerIndex;
long consumerIndex;
}
-keepclassmembersclass rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef {
rx.internal.util.atomic.LinkedQueueNode producerNode;
}
-keepclassmembersclass rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef {
rx.internal.util.atomic.LinkedQueueNode consumerNode;
}
#微信支付
-dontwarncom.tencent.mm.**
-dontwarncom.tencent.wxop.stat.**
-keepclass com.tencent.mm.** {*;}
-keepclass com.tencent.wxop.stat.**{*;}
#信鸽
-keeppublic class * extends android.app.Service
-keeppublic class * extends android.content.BroadcastReceiver
-keepclass com.tencent.android.tpush.** {* ;}
-keepclass com.tencent.mid.** {* ;}
-keepattributes*Annotation*
#新浪微博
-keepclass com.sina.weibo.sdk.* {*;}
-keepclass android.support.v4.* {*;}
-keepclass com.tencent.* {*;}
-keepclass com.baidu.* {*;}
-keepclass lombok.ast.ecj.* {*;}
-dontwarnandroid.support.v4.**
-dontwarncom.tencent.**s
-dontwarncom.baidu.**
#讯飞语音
-dontwarncom.iflytek.**
-keepclass com.iflytek.** {*;}
#银联
-dontwarncom.unionpay.**
-keepclass com.unionpay.** {*;}
#友盟统计分析
-keepclassmembersclass * {public (org.json.JSONObject);}
-keepclassmembersenum com.umeng.analytics.** {
public static **[] values();
public static ** valueOf(java.lang.String);
}
#友盟自动更新
-keepclassmembersclass * {public (org.json.JSONObject);}
-keeppublic class cn.irains.parking.cloud.pub.R$*{public static final int *;}
-keeppublic class * extends com.umeng.**
-keepclass com.umeng.** {*;}
#支付宝钱包
-dontwarncom.alipay.**
-dontwarnHttpUtils.HttpFetcher
-dontwarncom.ta.utdid2.**
-dontwarncom.ut.device.**
-keepclass com.alipay.android.app.IAlixPay{*;}
-keepclass com.alipay.android.app.IAlixPay$Stub{*;}
-keepclass com.alipay.android.app.IRemoteServiceCallback{*;}
-keepclass com.alipay.android.app.IRemoteServiceCallback$Stub{*;}
-keepclass com.alipay.sdk.app.PayTask{public *;}
-keepclass com.alipay.sdk.app.AuthTask{public *;}
-keepclass com.alipay.mobilesecuritysdk.*
-keepclass com.ut.*
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