本文章是转载的，原文地址：http://easion-zms.iteye.com/blog/981568
在调试的时候一般都是在logcat中看日志的信息，以便找出BUG和调试信息，但是如果在真机上的话不可能一直连接电脑查看日志，所以生成日志文件并保存，是一个比较普遍的需求，下面就是最近实现的一个例子。欢迎大家讨论并给出别的思路。
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import java.io.BufferedReader;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Arrays;import java.util.Calendar;import java.util.Comparator;import java.util.Date;import java.util.List;import android.app.AlarmManager;import android.app.PendingIntent;import android.app.Service;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.os.Environment;import android.os.IBinder;import android.os.PowerManager;import android.os.PowerManager.WakeLock;import android.util.Log;/** * 日志服务，日志默认会存储在SDcar里如果没有SDcard会存储在内存中的安装目录下面。 * 1.本服务默认在SDcard中每天生成一个日志文件, * 2.如果有SDCard的话会将之前内存中的文件拷贝到SDCard中 * 3.如果没有SDCard，在安装目录下只保存当前在写日志 * 4.SDcard的装载卸载动作会在步骤2,3中切换 * 5.SDcard中的日志文件只保存7天 * @author Administrator * */public class LogService extends Service { private static final String TAG = "LogService"; private static final int MEMORY_LOG_FILE_MAX_SIZE = 10 * 1024 * 1024; //内存中日志文件最大值，10M private static final int MEMORY_LOG_FILE_MONITOR_INTERVAL = 10 * 60 * 1000; //内存中的日志文件大小监控时间间隔，10分钟 private static final int SDCARD_LOG_FILE_SAVE_DAYS = 7; //sd卡中日志文件的最多保存天数 private String LOG_PATH_MEMORY_DIR; //日志文件在内存中的路径(日志文件在安装目录中的路径) private String LOG_PATH_SDCARD_DIR; //日志文件在sdcard中的路径 @SuppressWarnings("unused") private String LOG_SERVICE_LOG_PATH; //本服务产生的日志，记录日志服务开启失败信息 private final int SDCARD_TYPE = 0; //当前的日志记录类型为存储在SD卡下面 private final int MEMORY_TYPE = 1; //当前的日志记录类型为存储在内存中 private int CURR_LOG_TYPE = SDCARD_TYPE; //当前的日志记录类型 private String CURR_INSTALL_LOG_NAME; //如果当前的日志写在内存中，记录当前的日志文件名称 private String logServiceLogName = "Log.log";//本服务输出的日志文件名称 private SimpleDateFormat myLogSdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); private OutputStreamWriter writer; private SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HHmmss");//日志名称格式 private Process process; private WakeLock wakeLock; private SDStateMonitorReceiver sdStateReceiver; //SDcard状态监测 private LogTaskReceiver logTaskReceiver; /* 是否正在监测日志文件大小； * 如果当前日志记录在SDcard中则为false * 如果当前日志记录在内存中则为true*/ private boolean logSizeMoniting = false; private static String MONITOR_LOG_SIZE_ACTION = "MONITOR_LOG_SIZE"; //日志文件监测action private static String SWITCH_LOG_FILE_ACTION = "SWITCH_LOG_FILE_ACTION"; //切换日志文件action @Override public IBinder onBind(Intent intent) { return null; } @Override public void onCreate() { super.onCreate(); init(); register(); deploySwitchLogFileTask(); new LogCollectorThread().start(); } private void init(){ LOG_PATH_MEMORY_DIR = getFilesDir().getAbsolutePath() + File.separator + "log"; LOG_SERVICE_LOG_PATH = LOG_PATH_MEMORY_DIR + File.separator + logServiceLogName; LOG_PATH_SDCARD_DIR = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "MyApp" + File.separator + "log"; createLogDir(); /* ****************************************************** try { writer = new OutputStreamWriter(new FileOutputStream( LOG_SERVICE_LOG_PATH, true)); } catch (FileNotFoundException e) { Log.e(TAG, e.getMessage(), e); } * ******************************************************/ PowerManager pm = (PowerManager) getApplicationContext().getSystemService(Context.POWER_SERVICE); wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); CURR_LOG_TYPE = getCurrLogType(); Log.i(TAG, "LogService onCreate"); } private void register(){ IntentFilter sdCarMonitorFilter = new IntentFilter(); sdCarMonitorFilter.addAction(Intent.ACTION_MEDIA_MOUNTED); sdCarMonitorFilter.addAction(Intent.ACTION_MEDIA_UNMOUNTED); sdCarMonitorFilter.addDataScheme("file"); sdStateReceiver = new SDStateMonitorReceiver(); registerReceiver(sdStateReceiver, sdCarMonitorFilter); IntentFilter logTaskFilter = new IntentFilter(); logTaskFilter.addAction(MONITOR_LOG_SIZE_ACTION); logTaskFilter.addAction(SWITCH_LOG_FILE_ACTION); logTaskReceiver = new LogTaskReceiver(); registerReceiver(logTaskReceiver,logTaskFilter); } /** * 获取当前应存储在内存中还是存储在SDCard中 * @return */ public int getCurrLogType(){ if (!Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { return MEMORY_TYPE; }else{ return SDCARD_TYPE; } } /** * 部署日志切换任务，每天凌晨切换日志文件 */ private void deploySwitchLogFileTask() { Intent intent = new Intent(SWITCH_LOG_FILE_ACTION); PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, 0); Calendar calendar = Calendar.getInstance(); calendar.add(Calendar.DAY_OF_MONTH, 1); calendar.set(Calendar.HOUR_OF_DAY, 0); calendar.set(Calendar.MINUTE, 0); calendar.set(Calendar.SECOND, 0); // 部署任务 AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); am.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, sender); recordLogServiceLog("deployNextTask succ,next task time is:"+myLogSdf.format(calendar.getTime())); } /** * 日志收集 * 1.清除日志缓存 * 2.杀死应用程序已开启的Logcat进程防止多个进程写入一个日志文件 * 3.开启日志收集进程 * 4.处理日志文件 * 移动 OR 删除 */ class LogCollectorThread extends Thread { public LogCollectorThread(){ super("LogCollectorThread"); Log.d(TAG, "LogCollectorThread is create"); } @Override public void run() { try { wakeLock.acquire(); //唤醒手机 clearLogCache(); List<String> orgProcessList = getAllProcess(); List<ProcessInfo> processInfoList = getProcessInfoList(orgProcessList); killLogcatProc(processInfoList); createLogCollector(); Thread.sleep(1000);//休眠，创建文件，然后处理文件，不然该文件还没创建，会影响文件删除 handleLog(); wakeLock.release(); //释放 } catch (Exception e) { e.printStackTrace(); recordLogServiceLog(Log.getStackTraceString(e)); } } } /** * 每次记录日志之前先清除日志的缓存, 不然会在两个日志文件中记录重复的日志 */ private void clearLogCache() { Process proc = null; List<String> commandList = new ArrayList<String>(); commandList.add("logcat"); commandList.add("-c"); try { proc = Runtime.getRuntime().exec( commandList.toArray(new String[commandList.size()])); StreamConsumer errorGobbler = new StreamConsumer(proc .getErrorStream()); StreamConsumer outputGobbler = new StreamConsumer(proc .getInputStream()); errorGobbler.start(); outputGobbler.start(); if (proc.waitFor() != 0) { Log.e(TAG, " clearLogCache proc.waitFor() != 0"); recordLogServiceLog("clearLogCache clearLogCache proc.waitFor() != 0"); } } catch (Exception e) { Log.e(TAG, "clearLogCache failed", e); recordLogServiceLog("clearLogCache failed"); } finally { try { proc.destroy(); } catch (Exception e) { Log.e(TAG, "clearLogCache failed", e); recordLogServiceLog("clearLogCache failed"); } } } /** * 关闭由本程序开启的logcat进程： * 根据用户名称杀死进程(如果是本程序进程开启的Logcat收集进程那么两者的USER一致) * 如果不关闭会有多个进程读取logcat日志缓存信息写入日志文件 * * @param allProcList * @return */ private void killLogcatProc(List<ProcessInfo> allProcList) { if(process != null){ process.destroy(); } String packName = this.getPackageName(); String myUser = getAppUser(packName, allProcList); /* recordLogServiceLog("app user is:"+myUser); recordLogServiceLog("========================"); for (ProcessInfo processInfo : allProcList) { recordLogServiceLog(processInfo.toString()); } recordLogServiceLog("========================"); */ for (ProcessInfo processInfo : allProcList) { if (processInfo.name.toLowerCase().equals("logcat") && processInfo.user.equals(myUser)) { android.os.Process.killProcess(Integer .parseInt(processInfo.pid)); //recordLogServiceLog("kill another logcat process success,the process info is:" // + processInfo); } } } /** * 获取本程序的用户名称 * * @param packName * @param allProcList * @return */ private String getAppUser(String packName, List<ProcessInfo> allProcList) { for (ProcessInfo processInfo : allProcList) { if (processInfo.name.equals(packName)) { return processInfo.user; } } return null; } /** * 根据ps命令得到的内容获取PID，User，name等信息 * * @param orgProcessList * @return */ private List<ProcessInfo> getProcessInfoList(List<String> orgProcessList) { List<ProcessInfo> procInfoList = new ArrayList<ProcessInfo>(); for (int i = 1; i < orgProcessList.size(); i++) { String processInfo = orgProcessList.get(i); String[] proStr = processInfo.split(" "); // USER PID PPID VSIZE RSS WCHAN PC NAME // root 1 0 416 300 c00d4b28 0000cd5c S /init List<String> orgInfo = new ArrayList<String>(); for (String str : proStr) { if (!"".equals(str)) { orgInfo.add(str); } } if (orgInfo.size() == 9) { ProcessInfo pInfo = new ProcessInfo(); pInfo.user = orgInfo.get(0); pInfo.pid = orgInfo.get(1); pInfo.ppid = orgInfo.get(2); pInfo.name = orgInfo.get(8); procInfoList.add(pInfo); } } return procInfoList; } /** * 运行PS命令得到进程信息 * * @return * USER PID PPID VSIZE RSS WCHAN PC NAME * root 1 0 416 300 c00d4b28 0000cd5c S /init */ private List<String> getAllProcess() { List<String> orgProcList = new ArrayList<String>(); Process proc = null; try { proc = Runtime.getRuntime().exec("ps"); StreamConsumer errorConsumer = new StreamConsumer(proc .getErrorStream()); StreamConsumer outputConsumer = new StreamConsumer(proc .getInputStream(), orgProcList); errorConsumer.start(); outputConsumer.start(); if (proc.waitFor() != 0) { Log.e(TAG, "getAllProcess proc.waitFor() != 0"); recordLogServiceLog("getAllProcess proc.waitFor() != 0"); } } catch (Exception e) { Log.e(TAG, "getAllProcess failed", e); recordLogServiceLog("getAllProcess failed"); } finally { try { proc.destroy(); } catch (Exception e) { Log.e(TAG, "getAllProcess failed", e); recordLogServiceLog("getAllProcess failed"); } } return orgProcList; } /** * 开始收集日志信息 */ public void createLogCollector() { String logFileName = sdf.format(new Date()) + ".log";// 日志文件名称 List<String> commandList = new ArrayList<String>(); commandList.add("logcat"); commandList.add("-f"); //commandList.add(LOG_PATH_INSTALL_DIR + File.separator + logFileName); commandList.add(getLogPath()); commandList.add("-v"); commandList.add("time"); commandList.add("*:I"); //commandList.add("*:E");// 过滤所有的错误信息 // 过滤指定TAG的信息 // commandList.add("MyAPP:V"); // commandList.add("*:S"); try { process = Runtime.getRuntime().exec( commandList.toArray(new String[commandList.size()])); recordLogServiceLog("start collecting the log,and log name is:"+logFileName); // process.waitFor(); } catch (Exception e) { Log.e(TAG, "CollectorThread == >" + e.getMessage(), e); recordLogServiceLog("CollectorThread == >" + e.getMessage()); } } /** * 根据当前的存储位置得到日志的绝对存储路径 * @return */ public String getLogPath(){ createLogDir(); String logFileName = sdf.format(new Date()) + ".log";// 日志文件名称 if(CURR_LOG_TYPE == MEMORY_TYPE){ CURR_INSTALL_LOG_NAME = logFileName; Log.d(TAG, "Log stored in memory, the path is:"+LOG_PATH_MEMORY_DIR + File.separator + logFileName); return LOG_PATH_MEMORY_DIR + File.separator + logFileName; }else{ CURR_INSTALL_LOG_NAME = null; Log.d(TAG, "Log stored in SDcard, the path is:"+LOG_PATH_SDCARD_DIR + File.separator + logFileName); return LOG_PATH_SDCARD_DIR + File.separator + logFileName; } } /** * 处理日志文件 * 1.如果日志文件存储位置切换到内存中，删除除了正在写的日志文件 * 并且部署日志大小监控任务，控制日志大小不超过规定值 * 2.如果日志文件存储位置切换到SDCard中，删除7天之前的日志，移 * 动所有存储在内存中的日志到SDCard中，并将之前部署的日志大小 * 监控取消 */ public void handleLog(){ if(CURR_LOG_TYPE == MEMORY_TYPE){ deployLogSizeMonitorTask(); deleteMemoryExpiredLog(); }else{ moveLogfile(); cancelLogSizeMonitorTask(); deleteSDcardExpiredLog(); } } /** * 部署日志大小监控任务 */ private void deployLogSizeMonitorTask() { if(logSizeMoniting){ //如果当前正在监控着，则不需要继续部署 return; } logSizeMoniting = true; Intent intent = new Intent(MONITOR_LOG_SIZE_ACTION); PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, 0); AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); am.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(), MEMORY_LOG_FILE_MONITOR_INTERVAL, sender); Log.d(TAG, "deployLogSizeMonitorTask() succ !"); //recordLogServiceLog("deployLogSizeMonitorTask() succ ,start time is " + calendar.getTime().toLocaleString()); } /** * 取消部署日志大小监控任务 */ private void cancelLogSizeMonitorTask() { logSizeMoniting = false; AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE); Intent intent = new Intent(MONITOR_LOG_SIZE_ACTION); PendingIntent sender = PendingIntent.getBroadcast(this, 0, intent, 0); am.cancel(sender); Log.d(TAG, "canelLogSizeMonitorTask() succ"); } /** * 检查日志文件大小是否超过了规定大小 * 如果超过了重新开启一个日志收集进程 */ private void checkLogSize(){ if(CURR_INSTALL_LOG_NAME != null && !"".equals(CURR_INSTALL_LOG_NAME)){ String path = LOG_PATH_MEMORY_DIR + File.separator + CURR_INSTALL_LOG_NAME; File file = new File(path); if(!file.exists()){ return; } Log.d(TAG, "checkLog() ==> The size of the log is too big?"); if(file.length() >= MEMORY_LOG_FILE_MAX_SIZE){ Log.d(TAG, "The log's size is too big!"); new LogCollectorThread().start(); } } } /** * 创建日志目录 */ private void createLogDir() { File file = new File(LOG_PATH_MEMORY_DIR); boolean mkOk; if (!file.isDirectory()) { mkOk = file.mkdirs(); if (!mkOk) { mkOk = file.mkdirs(); } } /* ************************************ file = new File(LOG_SERVICE_LOG_PATH); if (!file.exists()) { try { mkOk = file.createNewFile(); if (!mkOk) { file.createNewFile(); } } catch (IOException e) { Log.e(TAG, e.getMessage(), e); } } * ************************************/ if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { file = new File(LOG_PATH_SDCARD_DIR); if (!file.isDirectory()) { mkOk = file.mkdirs(); if (!mkOk) { recordLogServiceLog("move file failed,dir is not created succ"); return; } } } } /** * 将日志文件转移到SD卡下面 */ private void moveLogfile() { if (!Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { //recordLogServiceLog("move file failed, sd card does not mount"); return; } File file = new File(LOG_PATH_SDCARD_DIR); if (!file.isDirectory()) { boolean mkOk = file.mkdirs(); if (!mkOk) { //recordLogServiceLog("move file failed,dir is not created succ"); return; } } file = new File(LOG_PATH_MEMORY_DIR); if (file.isDirectory()) { File[] allFiles = file.listFiles(); for (File logFile : allFiles) { String fileName = logFile.getName(); if (logServiceLogName.equals(fileName)) { continue; } //String createDateInfo = getFileNameWithoutExtension(fileName); boolean isSucc = copy(logFile, new File(LOG_PATH_SDCARD_DIR + File.separator + fileName)); if (isSucc) { logFile.delete(); //recordLogServiceLog("move file success,log name is:"+fileName); } } } } /** * 删除内存下过期的日志 */ private void deleteSDcardExpiredLog() { File file = new File(LOG_PATH_SDCARD_DIR); if (file.isDirectory()) { File[] allFiles = file.listFiles(); for (File logFile : allFiles) { String fileName = logFile.getName(); if (logServiceLogName.equals(fileName)) { continue; } String createDateInfo = getFileNameWithoutExtension(fileName); if (canDeleteSDLog(createDateInfo)) { logFile.delete(); Log.d(TAG, "delete expired log success,the log path is:" + logFile.getAbsolutePath()); } } } } /** * 判断sdcard上的日志文件是否可以删除 * @param createDateStr * @return */ public boolean canDeleteSDLog(String createDateStr) { boolean canDel = false; Calendar calendar = Calendar.getInstance(); calendar.add(Calendar.DAY_OF_MONTH, -1 * SDCARD_LOG_FILE_SAVE_DAYS);//删除7天之前日志 Date expiredDate = calendar.getTime(); try { Date createDate = sdf.parse(createDateStr); canDel = createDate.before(expiredDate); } catch (ParseException e) { Log.e(TAG, e.getMessage(), e); canDel = false; } return canDel; } /** * 删除内存中的过期日志，删除规则： * 除了当前的日志和离当前时间最近的日志保存其他的都删除 */ private void deleteMemoryExpiredLog(){ File file = new File(LOG_PATH_MEMORY_DIR); if (file.isDirectory()) { File[] allFiles = file.listFiles(); Arrays.sort(allFiles, new FileComparator()); for (int i=0;i<allFiles.length-2;i++) { //"-2"保存最近的两个日志文件 File _file = allFiles[i]; if (logServiceLogName.equals(_file.getName()) || _file.getName().equals(CURR_INSTALL_LOG_NAME)) { continue; } _file.delete(); Log.d(TAG, "delete expired log success,the log path is:"+_file.getAbsolutePath()); } } } /** * 拷贝文件 * @param source * @param target * @return */ private boolean copy(File source, File target) { FileInputStream in = null; FileOutputStream out = null; try { if(!target.exists()){ boolean createSucc = target.createNewFile(); if(!createSucc){ return false; } } in = new FileInputStream(source); out = new FileOutputStream(target); byte[] buffer = new byte[8*1024]; int count; while ((count = in.read(buffer)) != -1) { out.write(buffer, 0, count); } return true; } catch (Exception e) { e.printStackTrace(); Log.e(TAG, e.getMessage(), e); recordLogServiceLog("copy file fail"); return false; } finally{ try { if(in != null){ in.close(); } if(out != null){ out.close(); } } catch (IOException e) { e.printStackTrace(); Log.e(TAG, e.getMessage(), e); recordLogServiceLog("copy file fail"); return false; } } } /** * 记录日志服务的基本信息 防止日志服务有错，在LogCat日志中无法查找 * 此日志名称为Log.log * * @param msg */ private void recordLogServiceLog(String msg) { if (writer != null) { try { Date time = new Date(); writer.write(myLogSdf.format(time) + " : " + msg); writer.write("\n"); writer.flush(); } catch (IOException e) { e.printStackTrace(); Log.e(TAG, e.getMessage(), e); } } } /** * 去除文件的扩展类型（.log） * @param fileName * @return */ private String getFileNameWithoutExtension(String fileName){ return fileName.substring(0, fileName.indexOf(".")); } class ProcessInfo { public String user; public String pid; public String ppid; public String name; @Override public String toString() { String str = "user=" + user + " pid=" + pid + " ppid=" + ppid + " name=" + name; return str; } } class StreamConsumer extends Thread { InputStream is; List<String> list; StreamConsumer(InputStream is) { this.is = is; } StreamConsumer(InputStream is, List<String> list) { this.is = is; this.list = list; } public void run() { try { InputStreamReader isr = new InputStreamReader(is); BufferedReader br = new BufferedReader(isr); String line = null; while ((line = br.readLine()) != null) { if (list != null) { list.add(line); } } } catch (IOException ioe) { ioe.printStackTrace(); } } } /** * 监控SD卡状态 * @author Administrator * */ class SDStateMonitorReceiver extends BroadcastReceiver{ public void onReceive(Context context, Intent intent) { if(Intent.ACTION_MEDIA_UNMOUNTED.equals(intent.getAction())){ //存储卡被卸载 if(CURR_LOG_TYPE == SDCARD_TYPE){ Log.d(TAG, "SDcar is UNMOUNTED"); CURR_LOG_TYPE = MEMORY_TYPE; new LogCollectorThread().start(); } }else{ //存储卡被挂载 if(CURR_LOG_TYPE == MEMORY_TYPE){ Log.d(TAG, "SDcar is MOUNTED"); CURR_LOG_TYPE = SDCARD_TYPE; new LogCollectorThread().start(); } } } } /** * 日志任务接收 * 切换日志，监控日志大小 * @author Administrator * */ class LogTaskReceiver extends BroadcastReceiver{ public void onReceive(Context context, Intent intent) { String action = intent.getAction(); if(SWITCH_LOG_FILE_ACTION.equals(action)){ new LogCollectorThread().start(); }else if(MONITOR_LOG_SIZE_ACTION.equals(action)){ checkLogSize(); } } } class FileComparator implements Comparator<File>{ public int compare(File file1, File file2) { if(logServiceLogName.equals(file1.getName())){ return -1; }else if(logServiceLogName.equals(file2.getName())){ return 1; } String createInfo1 = getFileNameWithoutExtension(file1.getName()); String createInfo2 = getFileNameWithoutExtension(file2.getName()); try { Date create1 = sdf.parse(createInfo1); Date create2 = sdf.parse(createInfo2); if(create1.before(create2)){ return -1; }else{ return 1; } } catch (ParseException e) { return 0; } } } @Override public void onDestroy() { super.onDestroy(); recordLogServiceLog("LogService onDestroy"); if (writer != null) { try { writer.close(); } catch (IOException e) { e.printStackTrace(); } } if (process != null) { process.destroy(); } unregisterReceiver(sdStateReceiver); unregisterReceiver(logTaskReceiver); }}