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 android.util.Log;/** * 带日志文件输入的，又可控开关的日志调试 * * @author Dsw * @version 1.0 * @data 2012-2-20 */public class DswLog { private static char LOG_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 Boolean LOG_SWITCH = true; // 日志文件总开关 private static Boolean LOG_WRITE_TO_FILE = true; // 日志写入文件开关 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 LOGFILENAME = "Log.txt"; // 本类输出的日志文件名称 private static String LOG_PATH_SDCARD_DIR = "/sdcard/"; // 日志文件在sdcard中的路径 private static SimpleDateFormat LogSdf = 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, 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 (LOG_SWITCH) { if ('i' == level) { Log.e(tag, msg); } else if ('e' == level) { Log.i(tag, msg); } else if ('w' == level) { Log.w(tag, msg); } else if ('d' == level) { Log.d(tag, msg); }else { Log.v(tag, msg); } if (LOG_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) { Date nowtime = new Date(); String needWriteFiel = logfile.format(nowtime); String needWriteMessage = LogSdf.format(nowtime) + " " + mylogtype + " " + tag + " " + text; File file = new File(LOG_PATH_SDCARD_DIR, needWriteFiel + LOGFILENAME); 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) { e.printStackTrace(); } } /** * 删除制定的日志文件 * */ public static void delFile() { String needDelFiel = logfile.format(getDateBefore()); File file = new File(LOG_PATH_SDCARD_DIR, needDelFiel + LOGFILENAME); 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(); }}