打印log日志，保存在本地

import android.util.Log;

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
* Created by jingjingtan on 10/22/15.
*
* 打印log日志,并且保存到文件里
*/
public class MyLog {
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="/sdcard/";// 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 = "HawaLog.txt";// 本类输出的日志文件名称
private static SimpleDateFormat myLogSdf = new SimpleDateFormat(
"yyyy-MM-dd HH:mm:ss");// 日志的输出格式
private static SimpleDateFormat logfile = new SimpleDateFormat("yyyy-MM-dd");// 日志文件格式

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

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

public static void d(String tag, Object msg) {// 调试信息
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) {
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);
}
if (MYLOG_WRITE_TO_FILE)
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();
String needWriteFiel = logfile.format(nowtime);
String needWriteMessage = myLogSdf.format(nowtime) + "    " + mylogtype
+ "    " + tag + "    " + text;
File file = new File(MYLOG_PATH_SDCARD_DIR, needWriteFiel
+ MYLOGFILEName);
//        ELog.e("========"+file);
try {
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) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//        inPut(file);
}

/**
* 删除制定的日志文件
* */
public static void delFile() {// 删除日志文件
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();
}

/**
* 读取
*
* @return
*/
public static void inPut(File fileName) {
FileReader reader = null;
char[] buf = new char[1024];
int len = 0;
try {
reader = new FileReader(fileName);//fileName文件路径
while ((len = reader.read(buf)) != -1) {
ELog.e("==========="+new String(buf, 0, len));
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
reader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

}