Android log 方法

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package test;

public abstract class Logger {    private static Class<? extends Logger> mLoggerClass = null;    public static final boolean DBG = true;    public static final String TAG = null;    public static final String LINE = "------->";    private String mTag;    public Logger() {    }    public Logger(String tag) {        this.mTag = tag;    }    public static void registerLogger(Class<? extends Logger> loggerClass) {        Logger.mLoggerClass = loggerClass;    }    public static void unregisterLogger() {        Logger.mLoggerClass = null;    }    public static Logger getLogger(String tag) {        tag = "[" + tag + "]";        Logger logger = null;        if (mLoggerClass != null) {            try {                logger = mLoggerClass.newInstance();                logger.mTag = tag;            } catch (InstantiationException e) {                e.printStackTrace();            } catch (IllegalAccessException e) {                e.printStackTrace();            }        }        if (logger == null) {            logger = new Log(tag);        }        return logger;    }    public String getTag() {        return mTag;    }    public void d(String tag, String str) {        debug(mTag + LINE + str);    }    public void i(String tag, String str) {        info(mTag + LINE + str);    }    public void w(String tag, String str) {        warn(mTag + LINE + str);    }    public void e(String tag, String str) {        error(mTag + LINE + str);    }    public void d(String tag, String str, Throwable tr) {        debug(mTag + LINE + str, tr);    }    public void i(String tag, String str, Throwable tr) {        info(mTag + LINE + str, tr);    }    public void w(String tag, String str, Throwable tr) {        warn(mTag + LINE + str, tr);    }    public void e(String tag, String str, Throwable tr) {        error(mTag + LINE + str, tr);    }    protected abstract void debug(String str);    protected abstract void info(String str);    protected abstract void warn(String str);    protected abstract void error(String str);    protected abstract void debug(String str, Throwable tr);    protected abstract void info(String str, Throwable tr);    protected abstract void warn(String str, Throwable tr);    protected abstract void error(String str, Throwable tr);}

package test;import java.io.File;import java.io.FileOutputStream;import java.io.PrintStream;import java.util.Date;import android.os.Environment;public class Log extends Logger {    private static final String APP_TAG = "renwuto";    private static final String LOG_FILE_NAME = "renwuto.txt";    private static PrintStream logStream;    private static final String LOG_ENTRY_FORMAT = "[%tF %tT]%s";    public Log(String name) {        super(name);    }    @Override    protected void debug(String str) {        android.util.Log.d(APP_TAG, str);        write(str, null);    }    @Override    protected void error(String str) {        android.util.Log.e(APP_TAG, str);        write(str, null);    }    @Override    protected void info(String str) {        android.util.Log.i(APP_TAG, str);        write(str, null);    }    @Override    protected void warn(String str) {        android.util.Log.w(APP_TAG, str);        write(str, null);    }    @Override    protected void debug(String str, Throwable tr) {        android.util.Log.d(APP_TAG, str);        write(str, tr);    }    @Override    protected void error(String str, Throwable tr) {        android.util.Log.e(APP_TAG, str);        write(str, tr);    }    @Override    protected void info(String str, Throwable tr) {        android.util.Log.i(APP_TAG, str);        write(str, tr);    }    @Override    protected void warn(String str, Throwable tr) {        android.util.Log.w(APP_TAG, str);        write(str, tr);    }    private void write(String msg, Throwable tr) {        if (!Log.DBG) {            return;        }        try {            if (null == logStream) {                synchronized (Log.class) {                    if (null == logStream) {                        init();                    }                }            }            Date now = new Date();            if (null != logStream) {                logStream.printf(LOG_ENTRY_FORMAT, now, now, msg);                logStream.print("\n");            }            if (null != tr) {                tr.printStackTrace(logStream);                if (null != logStream) {                    logStream.print("\n");                }            }        } catch (Throwable t) {            // Empty catch block        }    }    public static void init() {        if (!Log.DBG) {            return;        }        try {            File sdRoot = null;            String state = Environment.getExternalStorageState();            if (Environment.MEDIA_MOUNTED.equals(state)) {                sdRoot = Environment.getExternalStorageDirectory();            }            if (sdRoot != null) {                File logFile = new File(sdRoot, LOG_FILE_NAME);                android.util.Log.d(APP_TAG, "Log to file : " + logFile);                logStream = new PrintStream(new FileOutputStream(logFile, true), true);            }        } catch (Throwable e) {            // Empty catch block        }    }    @Override    protected void finalize() throws Throwable {        try {            super.finalize();            if (logStream != null) {                logStream.close();            }        } catch (Throwable t) {            // Empty catch block        }    }}

 

Android log 方法