Android的生成日志文件

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。

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);    }}

最后不要忘记在配置文件中加入

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