Ln.java

package com.mobino.util;

import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileWriter;
import java.io.PrintStream;
import java.text.DateFormat;
import java.util.Locale;

import android.content.Context;
import android.util.Log;

public class Ln {
	private static boolean androidlog = true;
	private static boolean filelog = false;
	
	public static void d(String msg) {
		if (androidlog) {
			String tag = getTag();
			d(tag, msg);
		}
	}

	public static void i(String msg) {
		if (androidlog) {
			String tag = getTag();
			i(tag, msg);
		}
	}

	public static void e(String msg) {
		String tag = getTag();
		e(tag, msg);
	}

	public static void e(Throwable e) {
		String tag = getTag();
		e(tag, e);
	}

	public static void d(String tag, String msg) {
		if (androidlog) {
			Log.d(tag, msg);
		}
		writeLog(tag, msg, "d");
	}
	
	public static void i(String tag, String msg) {
		if (androidlog) {
			Log.i(tag, msg);
		}
		writeLog(tag, msg, "i");
	}
	
	public static void e(String tag, Throwable e) {
		//if (androidlog) {
			Log.e(tag, "exception caught: ", e);
		//}
		writeLog(tag, getStackTrace(e), "e");
	}

	public static void e(String tag, String msg) {
		//if (androidlog) {
			Log.e(tag, msg);
		//}
		writeLog(tag, msg, "e");
	}
	
	private static String getTag() {
		StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace();
		StackTraceElement element = stackTrace[4];
		String TAG = element.getClassName();
		return TAG;
	}

	public static String getThreadSignature() {
		Thread t = Thread.currentThread();
		long l = t.getId();
		String name = t.getName();
		long p = t.getPriority();
		String gname = t.getThreadGroup().getName();
		return (name 
				+ ":(id)" + l 
				+ ":(priority)" + p
				+ ":(group)" + gname);
	}

	private static void writeLog(String tag, String msg, String level) {
		if (!filelog) {
			return;
		}
		try {
			File dest = new File("/sdcard/mobino.log");
			
			FileWriter fstream = new FileWriter(dest, true);
			BufferedWriter out = new BufferedWriter(fstream);
			String t = time2DateTime(null, System.currentTimeMillis());
			out.write(t  + " " + tag + " " + level +  " " + msg + "\n");
			out.close();
		}
		catch (Exception e) {
			Log.e(Ln.class.getName(), "exception caught", e);
		}
	}
	
	public static String getStackTrace(Throwable ex) {
		ByteArrayOutputStream buf = new ByteArrayOutputStream();
		ex.printStackTrace(new PrintStream(buf));
		return buf.toString();
	}
	
	public static String time2DateTime(Context ctx, long d) {
		DateFormat df = DateFormat.getDateTimeInstance(
				DateFormat.SHORT, 
				DateFormat.SHORT, 
				Locale.US
		);
		return df.format(d);
	}
}