为了防止自己的劳动成果被别人窃取，混淆代码能有效防止被反编译，下面来总结以下混淆代码的步骤：
1. 大家也许都注意到新建一个工程会看到项目下边有这样proguard-project.txt一个文件，这个对混淆代码很重要，如果你不小心删掉了，没关系，从其他地方拷贝一个过来
2. 最重要的就是在proguard-project.txt添加混淆的申明了：
a. 把所有你的jar包都申明进来，例如：
-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.jarb. 将你不需要混淆的部分申明进来，因为有些类经过混淆会导致程序编译不通过，如下：
-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
有些很特殊的，例如百度地图，你需要添加以下申明：
-keep class com.baidu.** { *; }
-keep class vi.com.gdi.bgl.android.**{*;}根据我的经验，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.** { *; }
下面在贴上关于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.以上工作完成，混淆工作就完成了一大半了，最后需要做的就是在project.properties文件中加上你的混淆文件申明了，如下：
proguard.config=${sdk.dir}/tools/proguard/proguard-android.txt:proguard-project.txt
4. OK， 最后一步，打签名包测试，如果有问题，仔细看下Log也许有得类不能混淆，那么你得加入到proguard-project.txt文件中
-------以上就是混淆代码的全过程了
最后贴上proguard-project.txt的全部代码：
# 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 *;}
OK，That's all.
--Thank you!