一，设置开启混淆release {minifyEnabled truezipAlignEnabled trueshrinkResources trueproguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}

二，混淆的文件中，对gson相关类不进行混淆，否则会在运行中报错，

proguard-rules.pro在该文件中添加如下内容

# removes such information by default, so configure it to keep all of it.
-keepattributes Signature
# Gson specific classes
-keep class sun.misc.Unsafe { *; }
#-keep class com.google.gson.stream.** { *; }
# Application classes that will be serialized/deserialized over Gson
-keep class com.google.gson.examples.android.model.** { *; }
# //这句非常重要，主要是滤掉使用gson的bean文件不进行混淆编译，具体根据不同的包名进行调整
-keep class com.oubase.jk.bean.** {*;}