保留android程序崩溃日志到SD卡

	private boolean writeToSDCard(Throwable ex) 	{		boolean isDealing = false;		if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED))		{			RandomAccessFile randomAccessFile = null;			try			{				String fileName = SDCARDROOT + File.separator + "logs" + File.separator + "crash" + File.separator;				File file = new File(fileName);				if(!file.exists())					file.mkdirs();				randomAccessFile = new RandomAccessFile(fileName + paserTime(System.currentTimeMillis())+ ".log", "rw");				long fileLength = randomAccessFile.length();				randomAccessFile.seek(fileLength);				randomAccessFile.writeBytes(getThrowableInfo(ex));			} 			catch (IOException e) 			{				e.printStackTrace();			} 			finally 			{				if (randomAccessFile != null)				{					try 					{						randomAccessFile.close();						isDealing = true;					} 					catch (IOException e)					{						e.printStackTrace();					}				}			}		}		return isDealing;	}

	private static String getThrowableInfo(Throwable ex)	{		StringWriter stringWriter = new StringWriter();		PrintWriter printWriter = new PrintWriter(stringWriter);		ex.printStackTrace(printWriter);		return stringWriter.toString();	}