Android 使用log4j
前言：
如果要直接在android工程中使用log4j，是有点问题的，会报如下的错：
11-23 09:44:56.947: D/dalvikvm(1585): GC_FOR_MALLOC freed 3278 objects / 311568 bytes in 31ms rejecting opcode 0x21 at 0x000a rejected Lorg/apache/log4j/config/PropertySetter;.getPropertyDescriptor (Ljava/lang/String;)Ljava/beans/PropertyDescriptor; Verifier rejected class Lorg/apache/log4j/config/PropertySetter; Exception Ljava/lang/VerifyError; thrown during Lorg/apache/log4j/LogManager;. Shutting down VM threadid=1: thread exiting with uncaught exception (group=0x400259f8) FATAL EXCEPTION: main java.lang.ExceptionInInitializerError at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:64) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:253) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:265) ... Caused by: java.lang.VerifyError: org.apache.log4j.config.PropertySetter at org.apache.log4j.PropertyConfigurator.parseAppender(PropertyConfigurator.java:772) at org.apache.log4j.PropertyConfigurator.parseCategory(PropertyConfigurator.java:735) at org.apache.log4j.PropertyConfigurator.configureRootCategory(PropertyConfigurator.java:615) at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:502) at org.apache.log4j.PropertyConfigurator.doConfigure(PropertyConfigurator.java:547) at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:483) at org.apache.log4j.LogManager.(LogManager.java:127) ... 20 more
因此，可以另外多下载一个叫android-logging-log4j的项目，地址在：
http://code.google.com/p/android-logging-log4j/downloads/list，注意，原本的log4j还是需要的。
在AndroidManifest.xml中，增加如下设置：
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
然后在程序中如下使用：
package com.android.myapp;
.
import java.io.File;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
.
import android.app.Application;
import android.os.Environment;
import de.mindpipe.android.logging.log4j.LogConfigurator;
.
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
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(MyApplication.class);
log.info("My Application Created");
}
}
现在日志则是以：
Environment.getExternalStorageDirectory() + File.separator + "MyApp" + File.separator + "logs" + File.separator + "log4j.txt
的方式保存了。其他和log4j的用法差不多了。
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