Android开发调试日志工具类[支持保存到SD卡]

import java.io.File;    import java.io.FileWriter;    import java.io.IOException;    import java.io.PrintWriter;    import java.io.StringWriter;    import java.net.UnknownHostException;    import java.text.SimpleDateFormat;    import java.util.Date;        import android.annotation.SuppressLint;    import android.os.Environment;    import android.util.Log;        /**    * Android开发调试日志工具类[支持保存到SD卡]<br>    * <br>    *     * 需要一些权限: <br>    * <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> <br>    * <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" /><br>    *     * @author PMTOAM    *     */    @SuppressLint("SimpleDateFormat")    public class MyLog    {            public static final String CACHE_DIR_NAME = "dPhoneLog";                public static boolean isDebugModel = true;// 是否输出日志        public static boolean isSaveDebugInfo = true;// 是否保存调试日志        public static boolean isSaveCrashInfo = true;// 是否保存报错日志            public static void v(final String tag, final String msg)        {            if (isDebugModel)            {                Log.v(tag, "--> " + msg);            }        }            public static void d(final String tag, final String msg)        {            if (isDebugModel)            {                Log.d(tag, "--> " + msg);            }        }            public static void i(final String tag, final String msg)        {            if (isDebugModel)            {                Log.i(tag, "--> " + msg);            }        }            public static void w(final String tag, final String msg)        {            if (isDebugModel)            {                Log.w(tag, "--> " + msg);            }        }            /**        * 调试日志，便于开发跟踪。        * @param tag        * @param msg        */        public static void e(final String tag, final String msg)        {            if (isDebugModel)            {                Log.e(tag, "--> " + msg);            }                if (isSaveDebugInfo)            {                new Thread()                {                    public void run()                    {                        write(time() + tag + " --> " + msg + "\n");                    };                }.start();            }        }            /**        * try catch 时使用，上线产品可上传反馈。        * @param tag        * @param tr        */        public static void e(final String tag, final Throwable tr)        {            if (isSaveCrashInfo)            {                new Thread()                {                    public void run()                    {                        write(time() + tag + " [CRASH] --> "                                + getStackTraceString(tr) + "\n");                    };                }.start();            }        }            /**        * 获取捕捉到的异常的字符串        * @param tr        * @return        */        public static String getStackTraceString(Throwable tr)        {            if (tr == null)            {                return "";            }                Throwable t = tr;            while (t != null)            {                if (t instanceof UnknownHostException)                {                    return "";                }                t = t.getCause();            }                StringWriter sw = new StringWriter();            PrintWriter pw = new PrintWriter(sw);            tr.printStackTrace(pw);            return sw.toString();        }            /**        * 标识每条日志产生的时间        * @return        */        private static String time()        {            return "["                    + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date(                            System.currentTimeMillis())) + "] ";        }            /**        * 以年月日作为日志文件名称        * @return        */        private static String date()        {            return new SimpleDateFormat("yyyy-MM-dd").format(new Date(System                    .currentTimeMillis()));        }            /**        * 保存到日志文件        * @param content        */        public static synchronized void write(String content)        {            try            {                FileWriter writer = new FileWriter(getFile(), true);                writer.write(content);                writer.close();            }            catch (IOException e)            {                e.printStackTrace();            }        }            /**        * 获取日志文件路径        * @return        */        public static String getFile()        {            File sdDir = null;                if (Environment.getExternalStorageState().equals(                    android.os.Environment.MEDIA_MOUNTED))                sdDir = Environment.getExternalStorageDirectory();                File cacheDir = new File(sdDir + File.separator + CACHE_DIR_NAME);            if (!cacheDir.exists())                cacheDir.mkdir();                File filePath = new File(cacheDir + File.separator + date() + ".txt");                return filePath.toString();        }        }