SLF4J Android – is a Simple Logging Facade for Java (SLF4J) that adds a logger binding for the Android platform.
ProGuard rules for SLF4J
Add the following lines to your ProGuard configuration proguard.cfg file in project.
#################################### SLF4J ##################################### -dontwarn org.slf4j.**
For more information about SLF4J please see the website.