写了个android简洁的日志打印工具类。

package mma.demo.exception;import java.io.BufferedWriter;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;import java.util.Locale;import java.util.regex.Pattern;import android.content.Context;import android.os.Environment;import android.util.Log;/** * 打印工具类 * @author meimuan * 功能点：<p> * <ul> * <li>可以控制打印输出</li> * <li>可以简便打印，经过包装得到精准特定格式的日志信息</li> * <li>可以直接打印异常</li> * <li>可以定位异常信息</li> * <li>可以便捷统一修改，优化</li> *  <li>^^^^^^^^^^^^^^^^^^^^^^^^^^^^</li> *  <li>同步输出日志到本地sdcard文件</li> * </ul> * <p> * 需要注册权限： * <table> *  <tr> * <td>* 读写SD卡权限    </td><td>android.permission.WRITE_EXTERNAL_STORAGE</td> *  </tr> * <tr> * <td>? 网络权限    </td><td>android.permission.INTERNET</td> *  </tr> * </table> * </p> * <p> * 说明：<br/> * 1. 日志是针对天数级别的，自动生成的日志名称yyyyMMdd.log形式。</br> * 2. 如果当天的日志需要新开一个（比如：日志很大了，需要从新生成一个） * </p> */public class LogUtil {/** 控制打印级别 在level级别之上才可以被打印出来 */public static int LEVEL = 3;/** 打印级别为V，对应Log.v*/public final static int V = 1;/** 打印级别为W，对应Log.w*/public final static int W = 2;/** 打印级别为I，对应Log.i*/public final static int I = 3;/** 打印级别为D，对应Log.d*/public final static int D = 4;/** 打印级别为E，对应Log.e*/public final static int E = 5;/** 最高级别打印，强制性打印，LEVEL无法关闭。 */private final static int P = Integer.MAX_VALUE;/** 打印修饰符号*/private static final String _L = "[";private static final String _R = "]";/** 是否同步输出到本地日志文件 */private static boolean IS_SYNS = false;/** 打印日志保存路径*/private static String LOG_FILE_DIR = "";/** 生成一个日期文件名格式的日式格式对象*/private static final SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd",Locale.getDefault());/** 是否新建一个日志文件。*/private static boolean IF_START_NEWLOG = true;/** 保存创建的文件路径 */private static String CURRENT_LOG_NAME = "";/** 针对天数级别的。如果当天已经存在一个LOG了，而使用者需要新开一个LOG，那么将计数 */private static int FILE_LOG_COUNT = 0;/** 单个日志的最大的容量,如果一个日志太大了，打开会影响效率*/private static int LOG_MAX_SIZE = 6 * 1024 * 1024;/** 检测文件目的地址是否正确 */private static Pattern pattern = Pattern.compile("(\\w+/)+");/** 设置是否同步记录信息或者异常到日志文件。*/public static final void setSyns(boolean flag) {synchronized (LogUtil.class){IS_SYNS = flag;}}/** 开启一个新的LOG */public static final void startNewLog() {IF_START_NEWLOG = true;}/** * 打印信息 * @param message */public static final void i(String message) {if (LEVEL <= I) {Log.i(getTag(message), message);if (IS_SYNS) {LogFile.writeLog(message);}}}public static final void i(Exception exp) {if (LEVEL <= I) {Log.i(getTag(exp),getMessage(exp));if (IS_SYNS) {LogFile.writeLog(exp);}}}public static final void e(String message) {if (LEVEL <= E) {Log.e(getTag(message), message);if (IS_SYNS) {LogFile.writeLog(message);}}}public static final void e(Exception exp) {if (LEVEL <= E) {Log.e(getTag(exp),getMessage(exp));if (IS_SYNS) {LogFile.writeLog(exp);}}}public static final void w(String message) {if (LEVEL <= W) {Log.w(getTag(message), message);if (IS_SYNS) {LogFile.writeLog(message);}}}public static final void w(Exception exp) {if (LEVEL <= W) {Log.w(getTag(exp),getMessage(exp));if (IS_SYNS) {LogFile.writeLog(exp);}}}public static final void v(String message) {if (LEVEL <= V) {Log.v(getTag(message), message);if (IS_SYNS) {LogFile.writeLog(message);}}}public static final void v(Exception exp) {if (LEVEL <= V) {Log.v(getTag(exp),getMessage(exp));if (IS_SYNS) {LogFile.writeLog(exp);}}}public static final void d(String message) {if (LEVEL <= D) {Log.d(getTag(message), message);if (IS_SYNS) {LogFile.writeLog(message);}}}public static final void d(Exception exp) {if (LEVEL <= D) {Log.d(getTag(exp),getMessage(exp));if (IS_SYNS) {LogFile.writeLog(exp);}}}/** * 强制打印信息 * @param message */public static final void print(String message) {if (LEVEL <= P) {Log.e(getTag(message), message);if (IS_SYNS)LogFile.writeLog(message);}}/** * 强制打印异常 * @param exp */public static final void print(Exception exp) {if (LEVEL <= P) {Log.e(getTag(exp), getMessage(exp));if (IS_SYNS)LogFile.writeLog(exp);}}/** 获取一个Tag打印标签 * @param msg * @return * @since JDK 1.5 */private static String getTag(String msg) {if (msg != null) {//since jdk 1.5if (Thread.currentThread().getStackTrace().length > 0) {String name = Thread.currentThread().getStackTrace()[0].getClassName();return _L + name.substring(name.lastIndexOf(".") + 1) + _R;}}return _L + "null" + _R;}/** * 跟据变量获取一个打印的标签。 * @param exp * @return */private static String getTag(Exception exp) {if (exp != null) {if (exp.getStackTrace().length > 0) {String name = exp.getStackTrace()[0].getClassName();return _L + name.substring(name.lastIndexOf(".") + 1) + _R;}return _L + "exception" + _R;}return _L + "null" + _R;}/** * 获取Exception的简便异常信息 * @param exp * @return */private static String getMessage(Exception exp) {StringBuilder sb = new StringBuilder();StackTraceElement[] element =  exp.getStackTrace();int n = 0;sb.append("\n");sb.append(exp.toString());sb.append("\n");for (StackTraceElement e : element) {sb.append(e.getClassName());sb.append(".");sb.append(e.getMethodName());sb.append("[");sb.append(e.getLineNumber());sb.append("]");sb.append("\n");n++;if (n >= 2) break;}if (exp.getCause() != null) {sb.append("Caused by: ");sb.append(exp.getMessage());}return sb.toString();}/** 自定义保存文件路径，如果是多重路径，请以xxx/xxx/xxx 形式的‘文件夹’  *  @parma  path : 文件夹名称  *  * [将自动以当前时间为文件名拼接成完整路径。请慎用] *  */public final static void setLogFilePath(String path) {String url = SDcardUtil.getPath() + File.separator + path;boolean flag = pattern.matcher(url).matches();if (flag) {LOG_FILE_DIR = url;} else {LogFile.print("the url is not match file`s dir");}}/** 设置默认路径，以包名为格式的文件夹*/public final static void setDefaultFilePath(Context context) {String pkName = context.getPackageName().replaceAll("\\.", "\\/");setLogFilePath(pkName);}/** 获取时间字符串 */private static String getCurrTimeDir() {return sdf.format(new Date());}/** LOG定制类。 *  输出LOG到日志。 */private static class LogFile {/** 内部强制性打印使用。区分print ， 是为了解决无限循环打印exception*/private static void print(String msg) {if (LEVEL <= P) {Log.e(getTag(msg), msg);}}/** * 打印信息 * @param message */public static synchronized void writeLog(String message) {File f = getFile();if (f != null) {try {FileWriter fw = new FileWriter(f , true);BufferedWriter bw = new BufferedWriter(fw);bw.append("\n");bw.append(message);bw.append("\n");bw.flush();bw.close();fw.close();} catch (IOException e) {print("writeLog error, " + e.getMessage());}} else {print("writeLog error, due to the file dir is error");}}/** * 打印异常 * @param exp */public static synchronized void writeLog(Exception exp) {File f = getFile();if (f != null) {try {FileWriter fw = new FileWriter(f , true);PrintWriter pw = new PrintWriter(fw);pw.append("\n");exp.printStackTrace(pw);pw.flush();pw.close();fw.close();} catch (IOException e) {print("writeLog error, " + e.getMessage());}} else {print("writeLog error, due to the file dir is error");}}/** * 获取文件 * @return */private static final File getFile() {if ("".equals(LOG_FILE_DIR)) {return null;}synchronized (LogUtil.class) {if (!IF_START_NEWLOG) {File currFile = new File(CURRENT_LOG_NAME);if (currFile.length() >= LOG_MAX_SIZE) {IF_START_NEWLOG = true;return getFile();}return currFile;}File f = new File(LOG_FILE_DIR);if (!f.exists()) {f.mkdirs();}File file = new File(f.getAbsolutePath() + File.separator + getCurrTimeDir() + ".log");if (!file.exists()) {try {file.createNewFile();FILE_LOG_COUNT = 0;IF_START_NEWLOG = false;CURRENT_LOG_NAME = file.getAbsolutePath();} catch (IOException e) {print("createFile error , " + e.getMessage());}} else {//已经存在了if (IF_START_NEWLOG) {FILE_LOG_COUNT ++;return new File(f.getAbsolutePath() + File.separator + getCurrTimeDir() + "_" + FILE_LOG_COUNT+ ".log");}}return file;}}}/** * SD卡管理器 */private static class SDcardUtil {//public static String getAbsPath() {//if (isMounted()) {//return Environment.getExternalStorageDirectory().getAbsolutePath();//}//return "";//}/** 获取Path*/public static String getPath() {if (isMounted()) {return Environment.getExternalStorageDirectory().getPath();}LogFile.print("please check if sd card is not mounted");return "";}/** 判断SD卡是否mounted*/public static boolean isMounted() {return Environment.isExternalStorageEmulated();}}}

用法介绍：设置日志打印级别  LogUtil.LEVEL = LogUtil.W;  (默认为LogUtil.I)设置应用打印日志路径名称LogUtil.setDefaultFilePath(context);设置应用自定义打印日志路径名称LogUtil.setLogFilePath("com/demo/log");设置同步打印记录到日志LogUtil.setSyns(true);设置启用一个新的LOGLogUtil.startNewLog();打印单行信息LogUtil.i(msg)   LogUtil.v(msg)   LogUtil.w(msg)  LogUtil.d(msg)  LogUtil.e(msg);打印异常信息LogUtil.i(exp) .... ;强制打印信息LogUtil.print(msg);  LogUtil.print(exp);==========================================================================================一般应用发布前要除去项目中的打印信息，因此只需要设置LogUtil.LEVEL = 10 (比LogUtil.E大即可);对于强制打印的信息，将无法去除。欢迎大家补充，以及指点错误之处。

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