今天终于完成了近一个月的App开发工作，对程序进行混淆导出签名apk包时，却出现了如下的错误：
Proguard returned with error code 1. See console
Note: there were 4 duplicate class definitions.
Warning: library class android.content.res.XmlResourceParser extends or implements program class org.xmlpull.v1.XmlPullParser
Warning: library class android.content.Intent depends on program class org.xmlpull.v1.XmlPullParser
。。。
心里想着，真是好事多磨呀！
那就赶紧问度娘呀，终于在一位网友那里找到了答案。
对于Android导入了第三方jar包时，proguard混淆脚本会出现错误，而出现上面的错误是因为程序中引入了第三方jar包[ksoap2-android-assembly-2.6.5-jar-with-dependencies.jar]，二话不说，立马行动：
在proguard-project.txt中增加了
-ignorewarnings
-libraryjars lib/ksoap2-android-assembly-2.5.4-jar-with-dependencies.jar （jar包路径）
即在文件中增加了如下红色的两行：
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-verbose
-ignorewarnings
# Optimization is turned off by default. Dex does not like code run
# through the ProGuard optimize and preverify steps (and performs some
# of these optimizations on its own).
-dontoptimize
#-dontoptimize
# Note that if you want to enable optimization, you cannot just
# include optimization flags in your own project configuration file;
# instead you will need to point to the
# "proguard-android-optimize.txt" file instead of this one from your
# project.properties file.
-libraryjars libs/ksoap2-android-assembly-2.6.5-jar-with-dependencies.jar
-keepattributes *Annotation*
-keep public class com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService
Proguard returned with error code 1. See console
Note: there were 4 duplicate class definitions.
Warning: library class android.content.res.XmlResourceParser extends or implements program class org.xmlpull.v1.XmlPullParser
Warning: library class android.content.Intent depends on program class org.xmlpull.v1.XmlPullParser
。。。
心里想着，真是好事多磨呀！
那就赶紧问度娘呀，终于在一位网友那里找到了答案。
对于Android导入了第三方jar包时，proguard混淆脚本会出现错误，而出现上面的错误是因为程序中引入了第三方jar包[ksoap2-android-assembly-2.6.5-jar-with-dependencies.jar]，二话不说，立马行动：
在proguard-project.txt中增加了
-ignorewarnings
-libraryjars lib/ksoap2-android-assembly-2.5.4-jar-with-dependencies.jar （jar包路径）
即在文件中增加了如下红色的两行：
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-verbose
-ignorewarnings
# Optimization is turned off by default. Dex does not like code run
# through the ProGuard optimize and preverify steps (and performs some
# of these optimizations on its own).
-dontoptimize
#-dontoptimize
# Note that if you want to enable optimization, you cannot just
# include optimization flags in your own project configuration file;
# instead you will need to point to the
# "proguard-android-optimize.txt" file instead of this one from your
# project.properties file.
-libraryjars libs/ksoap2-android-assembly-2.6.5-jar-with-dependencies.jar
-keepattributes *Annotation*
-keep public class com.google.vending.licensing.ILicensingService
-keep public class com.android.vending.licensing.ILicensingService
![[JarEditor]可直接修改jar包的IDEA插件](https://ucc.alicdn.com/pic/developer-ecology/tfqi3qaz6nu2i_302451654d0141cf840457e1e9f7bee6.png?x-oss-process=image/format,webp/resize,h_160,m_lfit)