错误：
Error:warning: Ignoring InnerClasses attribute for an anonymous inner class
Error:associated EnclosingMethod attribute. This class was probably produced by a
Error:compiler that did not target the modern .class file format. The recommended
Error:solution is to recompile the class from source, using an up-to-date compiler
Error:and without specifying any "-target" type options. The consequence of ignoring
Error:this warning is that reflective operations on this class will incorrectly
Error:indicate that it is *not* an inner class.
这是由于项目添加的jar包已经混淆过再次混淆造成的。虽然有错误信息，但是不会影响编译过程及软件的使用，解决办法：在proguard-rules.pro文件中添加-keepattributes EnclosingMethod
1.如果在build.gradle中不添加 minifyEnabled false 默认是开启混淆的（as 2.1.3），不开启混淆则不会出现该错误。
2.如果1有问题，与 productFlavors 有关，