代码混淆步骤：
1，project.properties中打开代码混淆功能，加入proguard.config=proguard.cfg
2，编辑proguard.cfg文件，项目没有自动生成时可手工新建并放到项目根目录，内容如下
-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-ignorewarnings
-libraryjars libs/android-support-v4.jar -dontwarn android.support.v4.**
-keep class android.support.v4.** { *; }
-keep interface android.support.v4.app.** { *; }
-keep public class * extends android.support.v4.**
-keep public class * extends android.app.Fragment -libraryjars libs/asmack.jar
-libraryjars libs/aws-android-sdk-1.7.1.1-core.jar
-libraryjars libs/aws-android-sdk-1.7.1.1-s3.jar
-libraryjars libs/LibFrameWidget.jar
-libraryjars libs/LibFramework.jar
-libraryjars libs/locSDK_4.0.jar
-libraryjars libs/umeng_sdk.jar
-libraryjars libs/zxing-core.jar
-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 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 *;
}
应该注意的地方如下：
1，android-support-v4.jar报错的话，要加上下面的代码
-ignorewarnings
-dontwarn android.support.v4.**
-keep class android.support.v4.** { *; }
-keep interface android.support.v4.app.** { *; }
-keep public class * extends android.support.v4.**
-keep public class * extends android.app.Fragment
2，所有Libs下的jar包都要加上引用说明，格式如下（*未对应的jar包名称）
-libraryjars libs/*.jar