• -optimizationpasses 5
• -dontusemixedcaseclassnames
• -dontskipnonpubliclibraryclasses
• -dontpreverify
• -verbose
• -optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
• -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 com.android.vending.licensing.ILicensingService
• -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 *;
• }

-optimizationpasses 5-dontusemixedcaseclassnames-dontskipnonpubliclibraryclasses-dontpreverify-verbose-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*-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 com.android.vending.licensing.ILicensingService-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 *;}

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• # This file is automatically generated by Android Tools.
• # Do not modify this file -- YOUR CHANGES WILL BE ERASED!
• #
• # This file must be checked in Version Control Systems.
• #
• # To customize properties used by the Ant build system use,
• # "build.properties", and override values to adapt the script to your
• # project structure.
• # Project target.
• target=android-9
• proguardproguard.config=proguard.cfg

# This file is automatically generated by Android Tools.# Do not modify this file -- YOUR CHANGES WILL BE ERASED!## This file must be checked in Version Control Systems.## To customize properties used by the Ant build system use,# "build.properties", and override values to adapt the script to your# project structure.# Project target.target=android-9proguard.config=proguard.cfg
大功告成，正常的编译签名后就可以防止代码被反编译了。

2.3之前的SDK版本也没关系，把上面的proguard.cfg文件复制一份放到项目中，然后进行相同的操作即可。
有些应用反编译后java代码用jd-ui根本都无法打开，连混淆的代码都看不到的，本人尝试多次都做不到，希望知道的告知下怎么处理的。
 　　注意：上面的功能只是把java代码混淆了，xml和资源文件、图片并没有混淆，有些游戏应用图片比较重要需要转换成dat文件 再加上自己的加密解密算法还原。 另外加了混淆功能后还有压缩的功能，混淆后的apk比原来的小(具体比例看你的代码重复量了)