Android 离线log 保存工具类

提供一个自己写的离线Log工具类，将log保存到本地，以后后期排错，工具类可以实现如下功能：

设置log的保存路径
设置log保存的文件后缀
设置log是否开启（分Android自带的log和本地log）
设置log标签
log分类

如何使用：

LocalLog.setDefalutTag("cxq");
LocalLog.setFileName("MyLocalLog");
LocalLog.setLogPath("/sdcard/A");
LocalLog.i("1");
LocalLog.i("test", "1");
LocalLog.e("1");
LocalLog.e("test", "1");
LocalLog.f("1");
LocalLog.f("test", "1");
LocalLog.s("1");
LocalLog.s("test", "1");
//关闭Android自带log,只保存本地log
LocalLog.switchLog(false, true);
LocalLog.i("2");
LocalLog.i("test", "2");
LocalLog.e("2");
LocalLog.e("test", "2");
LocalLog.f("2");
LocalLog.f("test", "2");
LocalLog.s("2");
LocalLog.s("test", "2");

以下为离线Log工具类

package common;

import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.util.Calendar;
import java.util.TimeZone;

/**
* 一个将log保存到txt的工具类
* Created by CrystalChen on 2016/4/19.
*/
public class LocalLog {
static private String logPath = "/sdcard/LocalLog";
static private boolean androidLogOn = true;
static private boolean localLogOn = true;
static private String defalutTag = "LocalLog";
static private String fileName = "LocalLog";

static private String fileType = "txt";
public static final int INFO = 2;
public static final int ERROR = 3;
public static final int FAIL = 4;
public static final int SUCCESS = 5;

/**
* 设置log保存的文件类型，如 txt log等
*
* @param fileType
*/
public static void setFileType(String fileType) {
LocalLog.fileType = fileType;
}

/**
* 设置默认的tag
*
* @param defalutTag
*/
public static void setDefalutTag(String defalutTag) {
LocalLog.defalutTag = defalutTag;
}

/**
* 修改log的存放路径，如 /sdcard/mylog
*
* @param logPath
*/
public static void setLogPath(String logPath) {
LocalLog.logPath = logPath;
}

/**
* 修改log的文件名前缀
*
* @param fileName
*/
public static void setFileName(String fileName) {
LocalLog.fileName = fileName;
}

/**
* 切换log的保存状态
*
* @param androidLogOn Android自带的log开启状态
* @param localLogOn   txt文件记录状态
*/
public static void switchLog(boolean androidLogOn, boolean localLogOn) {
LocalLog.androidLogOn = androidLogOn;
LocalLog.localLogOn = localLogOn;
}

public static void i(String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.i(defalutTag, msg);
if (localLogOn)
printToFile(INFO, defalutTag, buffer);
}

public static void i(String tag, String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.i(tag, msg);
if (localLogOn)
printToFile(INFO, tag, buffer);
}

public static void e(String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.e(defalutTag, msg);
if (localLogOn)
printToFile(ERROR, defalutTag, buffer);
}

public static void e(String tag, String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.e(tag, msg);
if (localLogOn)
printToFile(ERROR, tag, buffer);
}

public static void f(String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.d(defalutTag, msg);
if (localLogOn)
printToFile(FAIL, defalutTag, buffer);
}

public static void f(String tag, String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.d(tag, msg);
if (localLogOn)
printToFile(FAIL, tag, buffer);
}

public static void s(String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.i(defalutTag, msg);
if (localLogOn)
printToFile(SUCCESS, defalutTag, buffer);
}

public static void s(String tag, String msg) {
byte[] buffer = msg.getBytes();
if (androidLogOn)
Log.i(tag, msg);
if (localLogOn)
printToFile(SUCCESS, tag, buffer);
}

private static void printToFile(int priority, String tag,
byte[] buffer) {
String logpath = logPath;
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("GMT+08:00"));
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH) + 1;
int day = cal.get(Calendar.DAY_OF_MONTH);
int hour = cal.get(Calendar.HOUR_OF_DAY);
int minute = cal.get(Calendar.MINUTE);
int second = cal.get(Calendar.SECOND);
int millisecond = cal.get(Calendar.MILLISECOND);

String timeString = String.format("%d-%02d-%02d %02d:%02d:%02d.%d",
year, month, day, hour, minute, second, millisecond);
String headString = String.format("\r\n%s\t(%d)\ttag:%s\tdata:",
timeString, priority, tag);
byte[] headBuffer = headString.getBytes();
String logFileName;
switch (priority) {
case INFO:
logFileName = "%s/" + fileName + "_Info%d%02d%02d.%s";
break;
case ERROR:
logFileName = "%s/" + fileName + "_Error%d%02d%02d.%s";
break;
case FAIL:
logFileName = "%s/" + fileName + "_Fail%d%02d%02d.%s";
break;
case SUCCESS:
logFileName = "%s/" + fileName + "_Success%d%02d%02d.%s";
break;
default:
logFileName = "%s/" + fileName + "%d%02d%02d.%s";
}
logFileName = String.format(logFileName, logpath, year, month, day, fileType);
FileOutputStream fo = null;
try {
File file = new File(logFileName);
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
file.createNewFile();
}
fo = new FileOutputStream(file, true);
fo.write(headBuffer);
fo.write(buffer);
} catch (Exception e) {
e.printStackTrace();
} finally {
if (fo != null) {
try {
fo.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

}