Android Studio導(dǎo)出apk并混淆很容易衅鹿，但是我們?nèi)绻鯯DK開發(fā)的話，只能提供給客戶jar包过咬，為了不透露自己的信息大渤，必須對jar包進行混淆。

一般混淆jar的方法

混淆jar大部分使用的是proguard 軟件掸绞，如下圖所示泵三，每次設(shè)置都要弄半天，我試了很久都莫名其妙報錯集漾。
我們是搞Android開發(fā)的，強大的Android Studio的集成了它砸脊，并且沒有那么多復(fù)雜的具篇，我們在Android Studio中直接使用就行了，完全不用下載proguard 軟件凌埂。

proguard.png

新建Module

新建Module.png

更改Module的build.gradle

在末尾添加如下代碼：

• 只導(dǎo)出并重命名jar包

task makeJar(type: Copy) {
    //刪除存在的
    delete 'build/libs/mysdk.jar'
    //設(shè)置拷貝的文件
    from('build/intermediates/bundles/release/')
    //打進jar包后的文件目錄
    into('build/outputs/jar/')
    //將classes.jar放入build/libs/目錄下
    //include ,exclude參數(shù)來設(shè)置過濾
    //（我們只關(guān)心classes.jar這個文件）
    include('classes.jar')
    //重命名
    rename ('classes.jar', 'mylib.jar')
}
makeJar.dependsOn(build)

• 導(dǎo)出并混淆jar包

task makeJar(type: proguard.gradle.ProGuardTask, dependsOn: "build") {
    // 未混淆的jar路徑
    injars 'build/intermediates/bundles/release/classes.jar'
    // 混淆后的jar輸出路徑
    outjars 'build/outputs/zmodo_wifi.jar'
    // 混淆協(xié)議
    configuration 'proguard-rules.pro'
//    configuration 'proguard-android.txt'
}

添加混淆協(xié)議

更改Android Studio的proguard-rules.pro文件驱显，具體設(shè)置見文末。

打開混淆開關(guān)

更改Module的build.gradle

minifyEnabled true

在終端執(zhí)行生成JAR包

在Android Studio的Terminal執(zhí)行

gradlew makeJar

如果出現(xiàn)既不是內(nèi)部命令，又不是外部命令埃疫，說明環(huán)境變量沒配置成功伏恐，請網(wǎng)上搜下Android Studio的Terminal配置。

proguard-rules.pro設(shè)置

末尾的是我自己項目的設(shè)置栓霜，請按照自己項目更改翠桦，其他的可以完全復(fù)制「炻混淆一定要注意JNI類销凑，很多錯誤就是JNI類導(dǎo)致的。

#-libraryjars libs\gson-2.2.2.jar

# 記錄生成的日志數(shù)據(jù)仅炊，在mapping目錄下
-printmapping build/outputs/mapping/release/mapping.txt

 -ignorewarnings

# Keep - Applications. Keep all application classes, along with their 'main'
# methods.
#-keepclasseswithmembers public class * {
#    public static void main(java.lang.String[]);
#}

# Also keep - Enumerations. Keep the special static methods that are required in
# enumeration classes.
-keepclassmembers enum  * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

# Also keep - Database drivers. Keep all implementations of java.sql.Driver.
-keep class * extends java.sql.Driver

# Also keep - Swing UI L&F. Keep all extensions of javax.swing.plaf.ComponentUI,
# along with the special 'createUI' method.
-keep class * extends javax.swing.plaf.ComponentUI {
    public static javax.swing.plaf.ComponentUI createUI(javax.swing.JComponent);
}

# Keep names - Native method names. Keep all native class/method names.
-keepclasseswithmembers,allowshrinking class * {
    native <methods>;
}

# Remove - System method calls. Remove all invocations of System
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.System {
    public static long currentTimeMillis();
    static java.lang.Class getCallerClass();
    public static int identityHashCode(java.lang.Object);
    public static java.lang.SecurityManager getSecurityManager();
    public static java.util.Properties getProperties();
    public static java.lang.String getProperty(java.lang.String);
    public static java.lang.String getenv(java.lang.String);
    public static java.lang.String mapLibraryName(java.lang.String);
    public static java.lang.String getProperty(java.lang.String,java.lang.String);
}

# Remove - Math method calls. Remove all invocations of Math
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.Math {
    public static double sin(double);
    public static double cos(double);
    public static double tan(double);
    public static double asin(double);
    public static double acos(double);
    public static double atan(double);
    public static double toRadians(double);
    public static double toDegrees(double);
    public static double exp(double);
    public static double log(double);
    public static double log10(double);
    public static double sqrt(double);
    public static double cbrt(double);
    public static double IEEEremainder(double,double);
    public static double ceil(double);
    public static double floor(double);
    public static double rint(double);
    public static double atan2(double,double);
    public static double pow(double,double);
    public static int round(float);
    public static long round(double);
    public static double random();
    public static int abs(int);
    public static long abs(long);
    public static float abs(float);
    public static double abs(double);
    public static int max(int,int);
    public static long max(long,long);
    public static float max(float,float);
    public static double max(double,double);
    public static int min(int,int);
    public static long min(long,long);
    public static float min(float,float);
    public static double min(double,double);
    public static double ulp(double);
    public static float ulp(float);
    public static double signum(double);
    public static float signum(float);
    public static double sinh(double);
    public static double cosh(double);
    public static double tanh(double);
    public static double hypot(double,double);
    public static double expm1(double);
    public static double log1p(double);
}

# Remove - Number method calls. Remove all invocations of Number
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.* extends java.lang.Number {
    public static java.lang.String toString(byte);
    public static java.lang.Byte valueOf(byte);
    public static byte parseByte(java.lang.String);
    public static byte parseByte(java.lang.String,int);
    public static java.lang.Byte valueOf(java.lang.String,int);
    public static java.lang.Byte valueOf(java.lang.String);
    public static java.lang.Byte decode(java.lang.String);
    public int compareTo(java.lang.Byte);
    public static java.lang.String toString(short);
    public static short parseShort(java.lang.String);
    public static short parseShort(java.lang.String,int);
    public static java.lang.Short valueOf(java.lang.String,int);
    public static java.lang.Short valueOf(java.lang.String);
    public static java.lang.Short valueOf(short);
    public static java.lang.Short decode(java.lang.String);
    public static short reverseBytes(short);
    public int compareTo(java.lang.Short);
    public static java.lang.String toString(int,int);
    public static java.lang.String toHexString(int);
    public static java.lang.String toOctalString(int);
    public static java.lang.String toBinaryString(int);
    public static java.lang.String toString(int);
    public static int parseInt(java.lang.String,int);
    public static int parseInt(java.lang.String);
    public static java.lang.Integer valueOf(java.lang.String,int);
    public static java.lang.Integer valueOf(java.lang.String);
    public static java.lang.Integer valueOf(int);
    public static java.lang.Integer getInteger(java.lang.String);
    public static java.lang.Integer getInteger(java.lang.String,int);
    public static java.lang.Integer getInteger(java.lang.String,java.lang.Integer);
    public static java.lang.Integer decode(java.lang.String);
    public static int highestOneBit(int);
    public static int lowestOneBit(int);
    public static int numberOfLeadingZeros(int);
    public static int numberOfTrailingZeros(int);
    public static int bitCount(int);
    public static int rotateLeft(int,int);
    public static int rotateRight(int,int);
    public static int reverse(int);
    public static int signum(int);
    public static int reverseBytes(int);
    public int compareTo(java.lang.Integer);
    public static java.lang.String toString(long,int);
    public static java.lang.String toHexString(long);
    public static java.lang.String toOctalString(long);
    public static java.lang.String toBinaryString(long);
    public static java.lang.String toString(long);
    public static long parseLong(java.lang.String,int);
    public static long parseLong(java.lang.String);
    public static java.lang.Long valueOf(java.lang.String,int);
    public static java.lang.Long valueOf(java.lang.String);
    public static java.lang.Long valueOf(long);
    public static java.lang.Long decode(java.lang.String);
    public static java.lang.Long getLong(java.lang.String);
    public static java.lang.Long getLong(java.lang.String,long);
    public static java.lang.Long getLong(java.lang.String,java.lang.Long);
    public static long highestOneBit(long);
    public static long lowestOneBit(long);
    public static int numberOfLeadingZeros(long);
    public static int numberOfTrailingZeros(long);
    public static int bitCount(long);
    public static long rotateLeft(long,int);
    public static long rotateRight(long,int);
    public static long reverse(long);
    public static int signum(long);
    public static long reverseBytes(long);
    public int compareTo(java.lang.Long);
    public static java.lang.String toString(float);
    public static java.lang.String toHexString(float);
    public static java.lang.Float valueOf(java.lang.String);
    public static java.lang.Float valueOf(float);
    public static float parseFloat(java.lang.String);
    public static boolean isNaN(float);
    public static boolean isInfinite(float);
    public static int floatToIntBits(float);
    public static int floatToRawIntBits(float);
    public static float intBitsToFloat(int);
    public static int compare(float,float);
    public boolean isNaN();
    public boolean isInfinite();
    public int compareTo(java.lang.Float);
    public static java.lang.String toString(double);
    public static java.lang.String toHexString(double);
    public static java.lang.Double valueOf(java.lang.String);
    public static java.lang.Double valueOf(double);
    public static double parseDouble(java.lang.String);
    public static boolean isNaN(double);
    public static boolean isInfinite(double);
    public static long doubleToLongBits(double);
    public static long doubleToRawLongBits(double);
    public static double longBitsToDouble(long);
    public static int compare(double,double);
    public boolean isNaN();
    public boolean isInfinite();
    public int compareTo(java.lang.Double);
    public <init>(byte);
    public <init>(short);
    public <init>(int);
    public <init>(long);
    public <init>(float);
    public <init>(double);
    public <init>(java.lang.String);
    public byte byteValue();
    public short shortValue();
    public int intValue();
    public long longValue();
    public float floatValue();
    public double doubleValue();
    public int compareTo(java.lang.Object);
    public boolean equals(java.lang.Object);
    public int hashCode();
    public java.lang.String toString();
}

# Remove - String method calls. Remove all invocations of String
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.String {
    public <init>();
    public <init>(byte[]);
    public <init>(byte[],int);
    public <init>(byte[],int,int);
    public <init>(byte[],int,int,int);
    public <init>(byte[],int,int,java.lang.String);
    public <init>(byte[],java.lang.String);
    public <init>(char[]);
    public <init>(char[],int,int);
    public <init>(java.lang.String);
    public <init>(java.lang.StringBuffer);
    public static java.lang.String copyValueOf(char[]);
    public static java.lang.String copyValueOf(char[],int,int);
    public static java.lang.String valueOf(boolean);
    public static java.lang.String valueOf(char);
    public static java.lang.String valueOf(char[]);
    public static java.lang.String valueOf(char[],int,int);
    public static java.lang.String valueOf(double);
    public static java.lang.String valueOf(float);
    public static java.lang.String valueOf(int);
    public static java.lang.String valueOf(java.lang.Object);
    public static java.lang.String valueOf(long);
    public boolean contentEquals(java.lang.StringBuffer);
    public boolean endsWith(java.lang.String);
    public boolean equalsIgnoreCase(java.lang.String);
    public boolean equals(java.lang.Object);
    public boolean matches(java.lang.String);
    public boolean regionMatches(boolean,int,java.lang.String,int,int);
    public boolean regionMatches(int,java.lang.String,int,int);
    public boolean startsWith(java.lang.String);
    public boolean startsWith(java.lang.String,int);
    public byte[] getBytes();
    public byte[] getBytes(java.lang.String);
    public char charAt(int);
    public char[] toCharArray();
    public int compareToIgnoreCase(java.lang.String);
    public int compareTo(java.lang.Object);
    public int compareTo(java.lang.String);
    public int hashCode();
    public int indexOf(int);
    public int indexOf(int,int);
    public int indexOf(java.lang.String);
    public int indexOf(java.lang.String,int);
    public int lastIndexOf(int);
    public int lastIndexOf(int,int);
    public int lastIndexOf(java.lang.String);
    public int lastIndexOf(java.lang.String,int);
    public int length();
    public java.lang.CharSequence subSequence(int,int);
    public java.lang.String concat(java.lang.String);
    public java.lang.String replaceAll(java.lang.String,java.lang.String);
    public java.lang.String replace(char,char);
    public java.lang.String replaceFirst(java.lang.String,java.lang.String);
    public java.lang.String[] split(java.lang.String);
    public java.lang.String[] split(java.lang.String,int);
    public java.lang.String substring(int);
    public java.lang.String substring(int,int);
    public java.lang.String toLowerCase();
    public java.lang.String toLowerCase(java.util.Locale);
    public java.lang.String toString();
    public java.lang.String toUpperCase();
    public java.lang.String toUpperCase(java.util.Locale);
    public java.lang.String trim();
}

# Remove - StringBuffer method calls. Remove all invocations of StringBuffer
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.StringBuffer {
    public <init>();
    public <init>(int);
    public <init>(java.lang.String);
    public <init>(java.lang.CharSequence);
    public java.lang.String toString();
    public char charAt(int);
    public int capacity();
    public int codePointAt(int);
    public int codePointBefore(int);
    public int indexOf(java.lang.String,int);
    public int lastIndexOf(java.lang.String);
    public int lastIndexOf(java.lang.String,int);
    public int length();
    public java.lang.String substring(int);
    public java.lang.String substring(int,int);
}

# Remove - StringBuilder method calls. Remove all invocations of StringBuilder
# methods without side effects whose return values are not used.
-assumenosideeffects public class java.lang.StringBuilder {
    public <init>();
    public <init>(int);
    public <init>(java.lang.String);
    public <init>(java.lang.CharSequence);
    public java.lang.String toString();
    public char charAt(int);
    public int capacity();
    public int codePointAt(int);
    public int codePointBefore(int);
    public int indexOf(java.lang.String,int);
    public int lastIndexOf(java.lang.String);
    public int lastIndexOf(java.lang.String,int);
    public int length();
    public java.lang.String substring(int);
    public java.lang.String substring(int,int);
}

##########################################################################
# added by firefox

##########################################################################
## from proguard-android-optimize.txt

# This is a configuration file for ProGuard.
# http://proguard.sourceforge.net/index.html#manual/usage.html

# Optimizations: If you don't want to optimize, use the
# proguard-android.txt configuration file instead of this one, which
# turns off the optimization flags.  Adding optimization introduces
# certain risks, since for example not all optimizations performed by
# ProGuard works on all versions of Dalvik.  The following flags turn
# off various optimizations known to have issues, but the list may not
# be complete or up to date. (The "arithmetic" optimization can be
# used if you are only targeting Android 2.0 or later.)  Make sure you
# test thoroughly if you go this route.
-optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*
-optimizationpasses 5
-allowaccessmodification
-dontpreverify # 表示不進行預(yù)校驗斗幼。這個預(yù)校驗是作用在Java平臺上的，Android平臺上不需要這項功能抚垄，去掉之后還可以加快混淆速度蜕窿。

# The remainder of this file is identical to the non-optimized version
# of the Proguard configuration file (except that the other file has
# flags to turn off optimization).

-dontusemixedcaseclassnames #表示混淆時不使用大小寫混合類名。
-dontskipnonpubliclibraryclasses # 表示不跳過library中的非public的類呆馁。
-verbose # 表示打印混淆的詳細信息桐经。

-keepattributes *Annotation* # 表示對注解中的參數(shù)進行保留。
-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
# 表示不混淆任何包含native方法的類的類名以及native方法名
-keepclasseswithmembernames class * {
    native <methods>;
}

# keep setters in Views so that animations can still work.
# see http://proguard.sourceforge.net/manual/examples.html#beans
# 表示不混淆任何一個View中的setXxx()和getXxx()方法智哀，
# 因為屬性動畫需要有相應(yīng)的setter和getter的方法實現(xiàn)次询，混淆了就無法工作了。
-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
# 表示不混淆Activity中參數(shù)是View的方法瓷叫，
# 因為有這樣一種用法屯吊，在XML中配置android:onClick=”buttonClick”屬性，當(dāng)用戶點擊該按鈕時就會調(diào)用
-keepclassmembers class * extends android.app.Activity {
   public void *(android.view.View);
}

# For enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations
# 表示不混淆枚舉中的values()和valueOf()方法
-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

# 表示不混淆Parcelable實現(xiàn)類中的CREATOR字段
-keep class * implements android.os.Parcelable {
  public static final android.os.Parcelable$Creator *;
}

# 表示不混淆R文件中的所有靜態(tài)字段
-keepclassmembers class **.R$* {
    public static <fields>;
}

# 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.**

##########################################################################
## from proguard-project.txt

# To enable ProGuard in your project, edit project.properties
# to define the proguard.config property as described in that file.
#
# Add project specific ProGuard rules here.
# By default, the flags in this file are appended to flags specified
# in ${sdk.dir}/tools/proguard/proguard-android.txt
# You can edit the include path and order by changing the ProGuard
# include property in project.properties.
#
# For more details, see
#   http://developer.android.com/guide/developing/tools/proguard.html

# Add any project specific keep options here:

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
#   public *;
#}

-keepclassmembers class * extends android.content.Context {
   public void *(android.view.View);
   public void *(android.view.MenuItem);
}

-keep public class * extends android.view.View {
    public <init>(android.content.Context);
    public <init>(android.content.Context, android.util.AttributeSet);
    public <init>(android.content.Context, android.util.AttributeSet, int);
    public void set*(...);
}

-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();
}

##########################################################################
# project setting

-keepattributes Exceptions,InnerClasses

# keep interface for inherit
-keep class * { public protected *; }

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

# annotation.
-keep public class android.annotation.** { *; }
-dontwarn android.annotation.**

##########################################################################
# Gson
# Gson uses generic type information stored in a class file when working with fields. Proguard
# 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.** { *; }
-keep class com.google.gson.examples.android.model.** { *; }
-keep class com.google.gson.** { *;}
-dontwarn com.google.gson.**

## end of Gson
##########################################################################

##########################################################################
# release log

#-assumenosideeffects class android.util.Log {
#   public static boolean isLoggable(java.lang.String, int);
#   public static int v(...);
#   public static int i(...);
#   public static int w(...);
#   public static int d(...);
#   public static int e(...);
#}

# end of release log
##########################################################################
# 項目獨有的摹菠，不要混淆jni類
-keep class com.xxx.xxxx.xxx.xxxxxx {
    *;
}
-keep class com.xxx.xxxx.xxxxx{
    *;
}

參考鏈接：
http://blog.csdn.net/qq_23547831/article/details/51966166
http://notes.stay4it.com/2016/02/26/export-jar-and-proguard/
http://blog.csdn.net/guolin_blog/article/details/50451259