為了防止自己的勞動成果被別人竊取，混淆代碼能有效防止被反編譯，下面來總結以下混淆代碼的步驟：

1. 大家也許都注意到新建一個工程會看到項目下邊有這樣proguard-project.txt一個文件，這個對混淆代碼很重要，如果你不小心刪掉了，沒關系，從其他地方拷貝一個過來

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包都申明進來，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.jar b. 將你不需要混淆的部分申明進來，因為有些類經過混淆會導致程序編譯不通過，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里邊的類，最好都要避免混淆 有些很特殊的，例如百度地圖，你需要添加以下申明： -keep class com.baidu.** { *; } -keep class vi.com.gdi.bgl.android.**{*;} 根據我的經驗，一般model最好避免混淆（model無關緊要，不混淆也沒多大關系）如： -keep class com.bank.pingan.model.** { *; } 下面在貼上關于Umeng分享統計的避免混淆的申明 -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，打簽名包測試，如果有問題，仔細看下Log也許有得類不能混淆，那么你得加入到proguard-project.txt文件中
-------以上就是混淆代碼的全過程了

最后貼上proguard-project.txt的全部代碼：
# 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. 依賴工程的jar 申明：
以下是郵件發送的實例
-libraryjars ../KlowerBase/libs/mail-activation.jar-libraryjars ../KlowerBase/libs/mail-additionnal.jar-libraryjars ../KlowerBase/libs/mail.jar
2. 解決郵件發送時報的以異常
-keep class javax.mail.**{*;}-keep class com.sun.mail.**{*;}-keep class javax.activation.**{*;}-keep class org.apache.harmony.**{*;}-keep class java.security.**{*;}
#解決：can't find referenced class java.beans.Beans -dontwarn org.apache.commons.collections.BeanMap -dontwarn java.beans.** #解決：can't find referenced class javax.security.sasl.Sasl -dontwarn com.sun.mail.imap.protocol.**

總結

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