Android日志打印工具

单例模式下的日志打印工具
转载自：http://blog.youkuaiyun.com/guolin_blog/article/details/8860649

public class LogUtil {  

    private static LogUtil sLogUtil;  

    public final int DEGUB = 0;  

    public final int INFO = 1;  

    public final int ERROR = 2;  

    public final int NOTHING = 3;  

    public int level = DEGUB;  

   private LogUtil(){  //私有构造函数，防止new出新对象

    }

    //单例模式
    public static LogUtil getInstance(){
        if(sLogUtil==null){
            synchronized (LogUtil.class) {  //同步锁机制
                if(sLogUtil==null){
                    sLogUtil=new LogUtil();
                }
            }
        }
        return sLogUtil;
    }

    public void debug(String msg) {  
        if (DEGUB >= level) {  
            System.out.println(msg);  
        }  
    }  

    public void info(String msg) {  
        if (INFO >= level) {  
            System.out.println(msg);  
        }  
    }  

    public void error(String msg) {  
        if (ERROR >= level) {  
            System.out.println(msg);  
        }  
    }  

}