Simple Logging Facade for Java (SLF4J) that adds a logger binding for the Android platform.
SLF4J serves as a simple facade or abstraction for various logging frameworks (e.g. java.util.logging, logback, log4j) allowing the end user to plug in the desired logging framework at deployment time.
SDK for Android
Binding for log4j version 1.2, a widely used logging framework. You also need to place log4j.jar on your class path.