android保存log信息

1、下载log4j.jar

http://pan.baidu.com/share/link?shareid=1766056665&uk=875968089&fid=2084669538 

2、下载android-logging-log4j

http://code.google.com/p/android-logging-log4j/downloads/detail?name=android-logging-log4j-1.0.3.jar&can=2&q= 

将以上两个jar包导入工程，编写保存log代码如下：

import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import de.mindpipe.android.logging.log4j.LogConfigurator;

import android.os.Environment;

......此处省略

private void saveLog() {
		
        LogConfigurator logConfigurator = new LogConfigurator();     
        logConfigurator.setFileName(Environment.getExternalStorageDirectory()  
                        + File.separator + "MyApp" + File.separator + "logs"  
                        + File.separator + "log4j.txt");  
        logConfigurator.setRootLevel(Level.DEBUG);  
        logConfigurator.setLevel("org.apache", Level.ERROR);  
        logConfigurator.setFilePattern("%d %-5p [%c{2}]-[%L] %m%n");  
        logConfigurator.setMaxFileSize(1024 * 1024 * 5);  
        logConfigurator.setImmediateFlush(true);  
        logConfigurator.configure();  

        Logger log = Logger.getLogger(MainActivity.class);  

        log.info("info"); 
        log.debug("debug");
}

运行程序，我们会发现生成/sdcard/MyApp/logs/log4j.txt文件，该文件内容为：

root@android:/sdcard/MyApp/logs # cat log4j.txt
cat log4j.txt
2013-12-24 02:20:47,236 INFO  [logger.MainActivity]-[68] info
2013-12-24 02:20:47,251 DEBUG [logger.MainActivity]-[69] debug

参考：

http://jackyrong.iteye.com/blog/1694699