直接上代码：

package com.xxx.utils;

import java.io.FileNotFoundException;
import java.io.PrintStream;
import java.text.SimpleDateFormat;
import java.util.AbstractMap;
import java.util.Date;
import android.app.Activity;
import android.content.Context;
import android.util.Log;

/**
* @Date 2016-5-10 下午7:56:11
* @Author Arvin
* @Description 工具类：Log日志信息抓取
*/ 
public class Logger {

   private static boolean ENABLE_LOG = true;// false为禁用日志打印,true开启日志打印
   private static boolean REDIRECTTO_FILE = false;

   public static String logFilePrefix = "LogDebug";

   public static void v(String tag, String msg) {
       if (ENABLE_LOG) {
           try {
               Log.v(tag, msg);
               logMsg(tag, msg);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void i(String tag, String msg) {
       if (ENABLE_LOG) {
           try {
               Log.i(tag, msg);
               logMsg(tag, msg);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void i(String tag, String msg, Throwable tr) {
       if (ENABLE_LOG) {
           try {
               Log.i(tag, msg, tr);
               logException(tag, msg, tr);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void d(String tag, String msg) {
       if (ENABLE_LOG) {
           try {
               Log.d(tag, msg);
               logMsg(tag, msg);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void d(String tag, String msg, Throwable tr) {
       if (ENABLE_LOG) {
           try {
               Log.d(tag, msg, tr);
               logException(tag, msg, tr);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void w(String tag, String msg) {
       if (ENABLE_LOG) {
           try {

               Log.w(tag, msg);
               logMsg(tag, msg);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void w(String tag, String msg, Throwable tr) {
       if (ENABLE_LOG) {
           try {
               Log.w(tag, msg, tr);
               logException(tag, msg, tr);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void e(String tag, String msg) {
       if (ENABLE_LOG) {
           try {
               Log.e(tag, msg);
               logMsg(tag, msg);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void e(String tag, String msg, Throwable tr) {
       if (ENABLE_LOG) {
           try {
               Log.e(tag, msg, tr);
               logException(tag, msg, tr);
           } catch (Exception e) {
               // TODO: handle exception
           }
       }
   }

   public static void initLog(Activity activity) {
       if (REDIRECTTO_FILE && ENABLE_LOG) {
           PrintStream out = null;
           try {
               out = new PrintStream(activity.openFileOutput(logFilePrefix
                       + System.currentTimeMillis() + ".log",
                       Context.MODE_WORLD_WRITEABLE), true);
           } catch (FileNotFoundException e) {
               e.printStackTrace();
           }
           System.setOut(out);
           System.setErr(out);
       }
   }

   private static void logMsg(String tag, String msg) {
       if (REDIRECTTO_FILE) {
           SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
           String date = sdf.format(new Date());
           StringBuilder sb = new StringBuilder();
           sb.append(date);
           sb.append("|");
           sb.append("Thread|");
           sb.append(Thread.currentThread().getId());
           sb.append(":");
           sb.append(tag);
           sb.append("=>");
           sb.append(msg);

           System.out.println(sb.toString());
       }
   }

   private static void logException(String tag, String msg, Throwable tr) {
       if (REDIRECTTO_FILE) {
           SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
           String date = sdf.format(new Date());
           StringBuilder sb = new StringBuilder();
           sb.append(date);
           sb.append("|");
           sb.append("Thread|");
           sb.append(Thread.currentThread().getId());
           sb.append(":");
           sb.append(tag);
           sb.append("=>");
           sb.append(msg);
           sb.append("=>Exception:");
           sb.append(tr);

           System.out.println(sb.toString());
       }
   }

   @SuppressWarnings("rawtypes")
   public static void dumpMap(String tag, AbstractMap m) {
       d(tag, "dump map information");
       for (Object obj : m.keySet())
           d(tag, "key:" + obj + ";\tvalue:" + m.get(obj));
   }
}