分享一个简单的Android日志文件记录类

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MusicLog
{
 private static MusicLog mMusicLog;
 /**日志保存路径*/
 private static final String LOG_SAVE_PATH = "sdcard/StackTraceLog/";
 /**日志开关*/
 private static final boolean LOG_SWITCH = false;
 
 public static MusicLog MusicLogInstance(){
  if(mMusicLog == null){
   mMusicLog = new MusicLog();
  }
  return mMusicLog;
 }
 
 /**插入日志*/
 public void addLog(String logStr){
  if(LOG_SWITCH){
   File file = checkLogFileIsExist();
   if(file == null)
    return;
   FileOutputStream fos = null;
   try
   {
    fos = new FileOutputStream(file, true);
    fos.write((new Date().toLocaleString() + " " + logStr).getBytes("gbk"));
    fos.write("\r\n".getBytes("gbk"));
   }
   catch (FileNotFoundException e)
   {
    e.printStackTrace();
   }
   catch (IOException e)
   {
    e.printStackTrace();
   }
   finally{
    try
    {
     if(fos != null){
      fos.close();
      fos = null;
     }
    }
    catch (IOException e)
    {
     e.printStackTrace();
    }
    fos = null;
    file = null;
   }
  }
 }
 
 /**检查日志文件是否存在*/
 private File checkLogFileIsExist(){
  if(!MemorySpaceManager.isSDExist()){
   return null;
  }
  File file = new File(LOG_SAVE_PATH);
  if(!file.exists()){
   file.mkdirs();
  }
  SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
  String dateStr = sdf.format(new Date());
  file = new File(LOG_SAVE_PATH + dateStr + ".txt");
  if(!isLogExist(file)){
   try
   {
    file.createNewFile();
   }
   catch (IOException e)
   {
    e.printStackTrace();
   }
  }
  sdf = null;
  return file;
 }
 
 /**
  * 检查当天日志文件是否存在
  * @param file
  * @return
  */
 private boolean isLogExist(File file){
  File tempFile = new File(LOG_SAVE_PATH);
  File[] files = tempFile.listFiles();
  for(int i = 0; i < files.length; i++){
   if(files[0].getName().trim().equalsIgnoreCase(file.getName())){
    return true;
   }
  }
  return false;
 }
 
 /**
  * 打印异常堆栈信息
  * @param e
  * @return
  */
 public static String getExceptionStackTrace(Throwable e){
        if(e != null){
            StringWriter sw = new StringWriter();
            PrintWriter pw = new PrintWriter(sw);
            e.printStackTrace(pw);
            return sw.toString();
        }
        return "";
    }
}