为了防止别人对自己被盗的劳动，混淆代码可以被反编译可以有效地防止，以下在下面的代码混乱总结的步骤：

1. 大家可能已经注意到一个新的项目将在下面看到的物品都有这个proguard-project.txt一份文件，该代码可用于混乱非常重要。假设你不小心删除，没关系，来

2. 最重要的就是在proguard-project.txt加入混淆的申明了：

a. 把全部你的jar包都申明进来，比如：

 -libraryjars libs/apns_1.0.6.jar

 -libraryjars libs/armeabi/libBaiduMapSDK_v2_3_1.so

 -libraryjars libs/armeabi/liblocSDK4.so

-libraryjars libs/baidumapapi_v2_3_1.jar

-libraryjars libs/core.jar

-libraryjars libs/gesture-imageview.jar

-libraryjars libs/gson-2.0.jar

-libraryjars libs/infogracesound.jar

-libraryjars libs/locSDK_4.0.jar

-libraryjars libs/ormlite-android-4.48.jar

-libraryjars libs/ormlite-core-4.48.jar

-libraryjars libs/universal-image-loader-1.9.0.jar

b. 将你不须要混淆的部分申明进来，由于有些类经过混淆会导致程序编译不通过，例如以下：

-keep public class * extends android.app.Fragment 

-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.support.v4.**

-keep public class com.android.vending.licensing.ILicensingService

--以上都是API里边的类，最好都要避免混淆

有些非常特殊的，比如百度地图，你须要加入下面申明：

-keep class com.baidu.** { *; }

-keep class vi.com.gdi.bgl.android.**{*;}

依据我的经验。一般model最好避免混淆（model无关紧要。不混淆也没多大关系）如：

-keep class com.bank.pingan.model.** { *; }

以下在贴上关于Umeng分享统计的避免混淆的申明

-dontwarn android.support.v4.** 

-dontwarn org.apache.commons.net.**

-dontwarn com.tencent.**

-keepclasseswithmembernames class * {

    native <methods>;

}

-keepclasseswithmembernames class * {

    public <init>(android.content.Context, android.util.AttributeSet);

}

-keepclasseswithmembernames class * {

    public <init>(android.content.Context, android.util.AttributeSet, int);

}

-keepclassmembers enum * {

    public static **[] values();

    public static ** valueOf(java.lang.String);

}

-keep class * implements android.os.Parcelable {

  public static final android.os.Parcelable$Creator *;

}

-keepclasseswithmembers class * {

    public <init>(android.content.Context);

}

-dontshrink

-dontoptimize

-dontwarn com.google.android.maps.**

-dontwarn android.webkit.WebView

-dontwarn com.umeng.**

-dontwarn com.tencent.weibo.sdk.**

-dontwarn com.facebook.**

-keep enum com.facebook.**

-keepattributes Exceptions,InnerClasses,Signature

-keepattributes *Annotation*

-keepattributes SourceFile,LineNumberTable

-keep public interface com.facebook.**

-keep public interface com.tencent.**

-keep public interface com.umeng.socialize.**

-keep public interface com.umeng.socialize.sensor.**

-keep public interface com.umeng.scrshot.**

-keep public class com.umeng.socialize.* {*;}

-keep public class javax.**

-keep public class android.webkit.**

-keep class com.facebook.**

-keep class com.umeng.scrshot.**

-keep public class com.tencent.** {*;}

-keep class com.umeng.socialize.sensor.**

-keep class com.tencent.mm.sdk.openapi.WXMediaMessage {*;}

-keep class com.tencent.mm.sdk.openapi.** implements com.tencent.mm.sdk.openapi.WXMediaMessage$IMediaObject {*;}

-keep class im.yixin.sdk.api.YXMessage {*;}

-keep class im.yixin.sdk.api.** implements im.yixin.sdk.api.YXMessage$YXMessageData{*;}

-keep public class [your_pkg].R$*{

    public static final int *;

}

3.以上工作完毕，混淆工作就完毕了一大半了。最后须要做的就是在project.properties文件里加上你的混淆文件申明了，例如以下：

proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt

4. OK。 最后一步，打签名包測试。假设有问题，细致看下Log或许有得类不能混淆，那么你得增加到proguard-project.txt文件里

-------以上就是混淆代码的全过程了

最后贴上proguard-project.txt的所有代码：

# 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 *;

#}

-optimizationpasses 5

-dontusemixedcaseclassnames

-dontskipnonpubliclibraryclasses

-dontpreverify

-verbose

-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*

-keepattributes *Annotation*

-keepattributes Signature

-libraryjars libs/apns_1.0.6.jar

-libraryjars libs/armeabi/libBaiduMapSDK_v2_3_1.so

-libraryjars libs/armeabi/liblocSDK4.so

-libraryjars libs/baidumapapi_v2_3_1.jar

-libraryjars libs/core.jar

-libraryjars libs/gesture-imageview.jar

-libraryjars libs/gson-2.0.jar

-libraryjars libs/infogracesound.jar

-libraryjars libs/locSDK_4.0.jar

-libraryjars libs/ormlite-android-4.48.jar

-libraryjars libs/ormlite-core-4.48.jar

-libraryjars libs/universal-image-loader-1.9.0.jar

-keep class com.baidu.** { *; }

-keep class vi.com.gdi.bgl.android.**{*;}

-keep public class * extends android.app.Fragment

-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.support.v4.**

-keep public class com.android.vending.licensing.ILicensingService

-keep class com.google.gson.stream.** { *; }

-keep class com.google.gson.examples.android.model.** { *; }

-keep class com.uuhelper.Application.** { *; }

-keep class net.sourceforge.zbar.** { *; }

-keep class com.google.android.gms.** { *; } 

-keep class com.bank.pingan.model.** { *; }

-keep public class * extends com.j256.ormlite.android.apptools.OrmLiteSqliteOpenHelper

-keep public class * extends com.j256.ormlite.android.apptools.OpenHelperManager

-keep class com.android.vending.licensing.ILicensingService

-keep class android.support.v4.** { *; }

-keep class org.apache.commons.net.** { *; }

-keep class com.tencent.** { *; }  

-keep class com.umeng.** { *; }

-keep class com.umeng.analytics.** { *; }

-keep class com.umeng.common.** { *; }

-keep class com.umeng.newxp.** { *; }  

-keep class com.j256.ormlite.** { *; }

-keep class com.j256.ormlite.android.** { *; }

-keep class com.j256.ormlite.field.** { *; }

-keep class com.j256.ormlite.stmt.** { *; } 

-dontwarn android.support.v4.**

-dontwarn org.apache.commons.net.**

-dontwarn com.tencent.**  

-keepclasseswithmembernames class * {

    native <methods>;

}

-keepclasseswithmembernames class * {

    public <init>(android.content.Context, android.util.AttributeSet);

}

-keepclasseswithmembernames class * {

    public <init>(android.content.Context, android.util.AttributeSet, int);

}

-keepclassmembers enum * {

    public static **[] values();

    public static ** valueOf(java.lang.String);

}

-keep class * implements android.os.Parcelable {

  public static final android.os.Parcelable$Creator *;

}

-keepclasseswithmembers class * {

    public <init>(android.content.Context);

}

-dontshrink

-dontoptimize

-dontwarn com.google.android.maps.**

-dontwarn android.webkit.WebView

-dontwarn com.umeng.**

-dontwarn com.tencent.weibo.sdk.**

-dontwarn com.facebook.**

-keep enum com.facebook.**

-keepattributes Exceptions,InnerClasses,Signature

-keepattributes *Annotation*

-keepattributes SourceFile,LineNumberTable

-keep public interface com.facebook.**

-keep public interface com.tencent.**

-keep public interface com.umeng.socialize.**

-keep public interface com.umeng.socialize.sensor.**

-keep public interface com.umeng.scrshot.**

-keep public class com.umeng.socialize.* {*;}

-keep public class javax.**

-keep public class android.webkit.**

-keep class com.facebook.**

-keep class com.umeng.scrshot.**

-keep public class com.tencent.** {*;}

-keep class com.umeng.socialize.sensor.**

-keep class com.tencent.mm.sdk.openapi.WXMediaMessage {*;}

-keep class com.tencent.mm.sdk.openapi.** implements com.tencent.mm.sdk.openapi.WXMediaMessage$IMediaObject {*;}

-keep class im.yixin.sdk.api.YXMessage {*;}

-keep class im.yixin.sdk.api.** implements im.yixin.sdk.api.YXMessage$YXMessageData{*;}

-keep public class [your_pkg].R$*{

    public static final int *;

}

2015-05-25更新

1. 依赖工程的jar 申明：

	下面是邮件发送的实例

   -libraryjars ../KlowerBase/libs/mail-activation.jar

   -libraryjars ../KlowerBase/libs/mail-additionnal.jar

   -libraryjars ../KlowerBase/libs/mail.jar

2. 解决邮件发送时报的以异常

   -keep class javax.mail.**{*;}

   -keep class com.sun.mail.**{*;}

  -keep class javax.activation.**{*;}

  -keep class org.apache.harmony.**{*;}

  -keep class java.security.**{*;}

#解决：can't find referenced class java.beans.Beans

-dontwarn org.apache.commons.collections.BeanMap

-dontwarn java.beans.**

#解决：can't find referenced class javax.security.sasl.Sasl

-dontwarn com.sun.mail.imap.protocol.**

OK，That's all.

--Thank you!