android开发 获取logcat日志并记录(方便离线调试)

转自：http://blog.csdn.net/jzh2012/article/details/7462506

感谢分享！

案例：当我们的软件安装在手机上的时候，或许还需要知道整个软件运行的情况，那么我们就需要一种把软件运行的状况记录下来，保存在某个地方(本地文件，以下就是解决方法

直接上代码：

package com.ifeng.fhdt.service;  
  
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("*:w");  
          
        //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&&line.contains(getPackageName())) {  
                    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);  
    }  
  
}  

此外还要加上权限：

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

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

<service
    android:name="com.xxx.LogService"
    android:enabled="true"
    android:exported="false"/>