Android输出调试日志至文件中

       本博客讲述的是android输出日志到文件中，不依赖于任何类，仅需配置读写外部存储卡的权限，可叠加输出日志文件，可区别调试模式与正式发布版本进行选择性输出。可直接在项目中使用。下面贴上代码,代码可到(LogUtils)下载,密码:hvqw。

1.申请权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE">
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE">
</uses-permission></uses-permission>

2.核心代码

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.RandomAccessFile;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.annotation.SuppressLint;
import android.os.Environment;

/**
* 日志输出类,输出日志至文件中
*
* @author yzy
*
*/
public class LogUtils {
public static String LOG_PATH = "";
public static String LOG_NAME = "/debug.log";
private static String INFO = "info";
private static String DEBUG = "debug";
private static String WARN = "warn";
private static String VERBOSE = "verbose";
private static String ERROR = "error";
private static final boolean isDebug = true ;
static {
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
LOG_PATH = Environment.getExternalStorageDirectory() + "/LogUtils" + "/.log" ;
}else{
LOG_PATH = "/LogUtils" + "/.log" ;
}
}

/**
* 初始化保存日志的文件
* @param path
* @param name
*/
public static void init(String path,String name){
LOG_PATH = path ;
LOG_NAME = name ;
}

public static void i(String content) {
saveLog(INFO, content);
}

public static void v(String content) {
saveLog(VERBOSE, content);
}

public static void d(String content) {
saveLog(DEBUG, content);
}

public static void e(String content) {
saveLog(ERROR, content);
}

public static void w(String content) {
saveLog(WARN, content);
}

@SuppressLint("SimpleDateFormat")
public static void saveLog(String type, String content) {
if(isDebug){//当当前是debug时,才进入保存日志操作
appendToFile_Third(LOG_PATH + LOG_NAME, new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS").format(new Date(
System.currentTimeMillis())) + "(" + type + "):" + content + "\r\n");
}
}

/**
* 第一种方式追加文本至文件中(随机文件流追加)
*
* @param filePath
* @param content
*/
public static void appendToFile_One(String filePath, String content) {
RandomAccessFile ranFile = null;
try {
File file = new File(filePath);
if (!file.exists()) {
file.getParentFile().mkdirs();
file.createNewFile();
}
ranFile = new RandomAccessFile(file, "rw");
long fileLength = ranFile.length();// 获取文件文本的长度
ranFile.seek(fileLength); // 设置游标至文件的尾部
ranFile.writeBytes(content);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (ranFile != null) {
ranFile.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

/**
* 第二种方式追加文本至文件中(BufferedWriter追加)
*
* @param filePath
* @param content
*/
public static void appendToFile_Two(String filePath, String content) {
BufferedWriter bufferedWriter = null;
try {
File file = new File(filePath);
if (!file.exists()) {
file.getParentFile().mkdirs();
file.createNewFile();
}
bufferedWriter = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(file)));
bufferedWriter.write(content);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (bufferedWriter != null) {
try {
bufferedWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

/**
* 第三种方式追加文本至文件中(BufferedWriter追加)
*
* @param filePath
* @param content
*/
public static void appendToFile_Third(String filePath, String content) {
FileWriter fileWriter = null;
try {
File file = new File(filePath);
if (!file.exists()) {
fil
a952
e.getParentFile().mkdirs();
file.createNewFile();
}
fileWriter = new FileWriter(file, true);// true表示附加
fileWriter.append(content);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fileWriter != null) {
try {
fileWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}