QuhaoLog.java

package com.withiter.quhao.util;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import com.withiter.quhao.util.tool.QuhaoConstant;

import android.os.Environment;
import android.util.Log;

/**
 * 带日志文件输入的，又可控开关的日志调试
 * 
 * @author Cross
 */
public class QuhaoLog {
	private static Boolean MYLOG_SWITCH = true; 						// 日志文件总开关
	private static Boolean MYLOG_WRITE_TO_FILE = true; 					// 日志写入文件开关
	private static char MYLOG_TYPE = 'v'; 								// 输入日志类型，w代表只输出告警信息等，v代表输出所有信息
	private static String MYLOG_PATH_SDCARD_DIR = Environment
			.getExternalStorageDirectory().getPath(); 					// 日志文件在sdcard中的路径
	private static int SDCARD_LOG_FILE_SAVE_DAYS = 0; 					// sd卡中日志文件的最多保存天数
	private static String MYLOGFILEName = "QuhaoLog.txt";				// 本类输出的日志文件名称

	public static void w(String tag, Object msg) {
		log(tag, msg.toString(), 'w');
	}

	public static void e(String tag, Object msg) {
		log(tag, msg.toString(), 'e');
	}

	public static void d(String tag, Object msg) {
		log(tag, msg.toString(), 'd');
	}

	public static void i(String tag, Object msg) {
		log(tag, msg.toString(), 'i');
	}

	public static void v(String tag, Object msg) {
		log(tag, msg.toString(), 'v');
	}

	public static void w(String tag, String text) {
		log(tag, text, 'w');
	}

	public static void e(String tag, String text) {
		log(tag, text, 'e');
	}

	public static void d(String tag, String text) {
		log(tag, text, 'd');
	}

	public static void i(String tag, String text) {
		log(tag, text, 'i');
	}

	public static void v(String tag, String text) {
		log(tag, text, 'v');
	}

	/**
	 * 根据tag, msg和等级，输出日志
	 * 
	 * @param tag
	 * @param msg
	 * @param level
	 * @return void
	 * @since v 1.0
	 */
	private static void log(String tag, String msg, char level) {
		
		// 增加行号显示
		Throwable state = new Throwable();
		StackTraceElement[] elements = state.getStackTrace();
		if(elements != null && elements[2] != null){
			int lineNumber = elements[2].getLineNumber();
			msg = "line number "+lineNumber+": " + msg;
		}
		
		if (MYLOG_SWITCH) {
			if ('e' == level && ('e' == MYLOG_TYPE || 'v' == MYLOG_TYPE)) { // 输出错误信息
				Log.e(tag, msg);
			} else if ('w' == level && ('w' == MYLOG_TYPE || 'v' == MYLOG_TYPE)) {
				Log.w(tag, msg);
			} else if ('d' == level && ('d' == MYLOG_TYPE || 'v' == MYLOG_TYPE)) {
				Log.d(tag, msg);
			} else if ('i' == level && ('d' == MYLOG_TYPE || 'v' == MYLOG_TYPE)) {
				Log.i(tag, msg);
			} else {
				Log.v(tag, msg);
			}

			boolean sdCardExist = Environment.getExternalStorageState().equals(
					android.os.Environment.MEDIA_MOUNTED); // 判断sd卡是否存在
			if (MYLOG_WRITE_TO_FILE && sdCardExist) {
				writeLogtoFile(String.valueOf(level), tag, msg);
			}
		}
	}

	/**
	 * 打开日志文件并写入日志
	 * 
	 * @return
	 * **/
	private static void writeLogtoFile(String mylogtype, String tag, String text) {// 新建或打开日志文件
		Date nowtime = new Date();
		SimpleDateFormat logfile = new SimpleDateFormat("yyyy-MM-dd");// 日志文件格式
		String needWriteFiel = logfile.format(nowtime);
		SimpleDateFormat myLogSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		String needWriteMessage = myLogSdf.format(nowtime) + "    " + mylogtype
				+ "    " + tag + "    " + text;
		File fileDir = new File(MYLOG_PATH_SDCARD_DIR + "/"+QuhaoConstant.LOGS_SD_URL);
		if(!fileDir.exists()){
			fileDir.mkdirs();
		}
		File file = new File(MYLOG_PATH_SDCARD_DIR + "/"+QuhaoConstant.LOGS_SD_URL, needWriteFiel
				+ MYLOGFILEName);
		
		try {
			if(!file.exists())
			{
				file.createNewFile();
			}
			FileWriter filerWriter = new FileWriter(file, true);// 后面这个参数代表是不是要接上文件中原来的数据，不进行覆盖
			BufferedWriter bufWriter = new BufferedWriter(filerWriter);
			bufWriter.write(needWriteMessage);
			bufWriter.newLine();
			bufWriter.close();
			filerWriter.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 删除制定的日志文件
	 * */
	public static void delFile() {// 删除日志文件
		SimpleDateFormat logfile = new SimpleDateFormat("yyyy-MM-dd");// 日志文件格式
		String needDelFiel = logfile.format(getDateBefore());
		File file = new File(MYLOG_PATH_SDCARD_DIR, needDelFiel + MYLOGFILEName);
		if (file.exists()) {
			file.delete();
		}
	}

	/**
	 * 得到现在时间前的几天日期，用来得到需要删除的日志文件名
	 * */
	private static Date getDateBefore() {
		Date nowtime = new Date();
		Calendar now = Calendar.getInstance();
		now.setTime(nowtime);
		now.set(Calendar.DATE, now.get(Calendar.DATE)
				- SDCARD_LOG_FILE_SAVE_DAYS);
		return now.getTime();
	}

}