Log 4J in Android

Download the log4j-1.2.17.jar and android-logging-log4j-1.0.3.jar from the links given in the references. (the version number could vary in the file name, as of this writing these are the files i was able to download)

After this added the gradle build file using Open Module Settings -> Dependencies -> File Dependancies 

The build.gradle file looked like this 

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:22.1.1'
    compile 'com.android.support:support-v4:22.1.1'
    compile 'com.google.android.gms:play-services:7.3.0'
    compile files('libs/android-logging-log4j-1.0.3.jar')
    compile files('libs/log4j-1.2.17.jar')
}

Now added the Log4jHelper class like this below. 

package mypackage;

import android.os.Environment;
import de.mindpipe.android.logging.log4j.LogConfigurator;


public class Log4jHelper {
    private final static LogConfigurator mLogConfigrator = new LogConfigurator();

    static {
        configureLog4j();
    }

    private static void configureLog4j() {
        String fileName = Environment.getExternalStorageDirectory() + "/" + "log4j.log";
        String filePattern = "%d - [%c] - %p : %m%n";
        int maxBackupSize = 10;
        long maxFileSize = 1024 * 1024;

        configure( fileName, filePattern, maxBackupSize, maxFileSize );
    }

    private static void configure( String fileName, String filePattern, int maxBackupSize, long maxFileSize ) {
        mLogConfigrator.setFileName( fileName );
        mLogConfigrator.setMaxFileSize( maxFileSize );
        mLogConfigrator.setFilePattern(filePattern);
        mLogConfigrator.setMaxBackupSize(maxBackupSize);
        mLogConfigrator.setUseLogCatAppender(true);
        mLogConfigrator.configure();

    }

    public static org.apache.log4j.Logger getLogger( String name ) {
        org.apache.log4j.Logger logger = org.apache.log4j.Logger.getLogger( name );
        return logger;
    }
}

From the application code, call the below, 

org.apache.log4j.Logger logger= Log4jHelper.getLogger("MainActivity");
logger.info("This is a sample message as info");
logger.trace("This is a sample message as trace");
logger.warn("This is a sample message as warn");

Thats it! . i was able to see the log4j.log file under storage in sdcard. 

References:

http://stackoverflow.com/questions/1756296/android-writing-logs-to-text-file

https://logging.apache.org/log4j/1.2/download.html

https://code.google.com/p/android-logging-log4j/downloads/detail?name=android-logging-log4j-1.0.3.jar