public class NaviDebug {

	public static NaviDebug m_instance = null;
	String m_filename;
	String SDPATH;

	protected NaviDebug() {
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");// 設定日期格式
		m_filename = df.format(new Date());// new Date()為獲取當前系統時間
		// 以第一次啟動的日期做為檔名，如果沒有則建立，否則追加
		SDPATH = Environment.getExternalStorageDirectory().getAbsolutePath();
		File navifolder = new File(SDPATH + "/navilog");
		if (!navifolder.exists() && !navifolder.isDirectory()) {
			navifolder.mkdir();
		}

		m_filename = SDPATH + "/debuglog/" + m_filename + ".log";
		File file = new File(m_filename);
		if (!file.exists()) {
			try {
				file.createNewFile(); // 建立檔案
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

	public static NaviDebug getInstance() {
		if (m_instance != null) {
			return m_instance;
		} else {
			m_instance = new NaviDebug();
			return m_instance;
		}
	}

	public void saveLog(String logstr) {
		m_instance.saveLogToFile(logstr);
	}

	private void saveLogToFile(String logstr) {
		// 啟動執行緒在檔案末尾追加log
		new LogThread(m_filename, logstr).start();
	}

	class LogThread extends Thread {
		private String m_logfilename;
		private String m_logstr;

		public LogThread(String name, String logstr) {
			m_logfilename = name;

			SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");// 設定日期格式
			String t_time = df.format(new Date());

			m_logstr = t_time + logstr + " \n"; // 需要換行
		}

		@Override
		public void run() {
			LogWriter logwter = new LogWriter();
			logwter.writeToFile(m_logfilename, m_logstr);
		}
	};

	public static class LogWriter {
		public static synchronized void writeToFile(String filename,
				String logstr) {
			try {
				FileOutputStream fos = new FileOutputStream(new File(filename),
						true);
				fos.write(logstr.getBytes());
				fos.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	};

}