DateTimeHelper.java

package com.ch_linghu.fanfoudroid.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import android.util.Log;

import com.ch_linghu.fanfoudroid.R;
import com.ch_linghu.fanfoudroid.TwitterApplication;
import com.ch_linghu.fanfoudroid.db.TwitterDatabase;

public class DateTimeHelper {
	private static final String TAG = "DateTimeHelper";

	// Wed Dec 15 02:53:36 +0000 2010
	public static final DateFormat TWITTER_DATE_FORMATTER = new SimpleDateFormat(
			"E MMM d HH:mm:ss Z yyyy", Locale.US);

	public static final DateFormat TWITTER_SEARCH_API_DATE_FORMATTER = new SimpleDateFormat(
			"E, d MMM yyyy HH:mm:ss Z", Locale.US); // TODO: Z -> z ?

	public static final Date parseDateTime(String dateString) {
		try {
			Log.v(TAG, String.format("in parseDateTime, dateString=%s",
					dateString));
			return TWITTER_DATE_FORMATTER.parse(dateString);
		} catch (ParseException e) {
			Log.w(TAG, "Could not parse Twitter date string: " + dateString);
			return null;
		}
	}

	// Handle "yyyy-MM-dd'T'HH:mm:ss.SSS" from sqlite
	public static final Date parseDateTimeFromSqlite(String dateString) {
		try {
			Log.v(TAG, String.format("in parseDateTime, dateString=%s",
					dateString));
			return TwitterDatabase.DB_DATE_FORMATTER.parse(dateString);
		} catch (ParseException e) {
			Log.w(TAG, "Could not parse Twitter date string: " + dateString);
			return null;
		}
	}

	public static final Date parseSearchApiDateTime(String dateString) {
		try {
			return TWITTER_SEARCH_API_DATE_FORMATTER.parse(dateString);
		} catch (ParseException e) {
			Log.w(TAG, "Could not parse Twitter search date string: "
					+ dateString);
			return null;
		}
	}

	public static final DateFormat AGO_FULL_DATE_FORMATTER = new SimpleDateFormat(
			"yyyy-MM-dd HH:mm");

	public static String getRelativeDate(Date date) {
		Date now = new Date();

		String prefix = TwitterApplication.mContext
				.getString(R.string.tweet_created_at_beautify_prefix);
		String sec = TwitterApplication.mContext
				.getString(R.string.tweet_created_at_beautify_sec);
		String min = TwitterApplication.mContext
				.getString(R.string.tweet_created_at_beautify_min);
		String hour = TwitterApplication.mContext
				.getString(R.string.tweet_created_at_beautify_hour);
		String day = TwitterApplication.mContext
				.getString(R.string.tweet_created_at_beautify_day);
		String suffix = TwitterApplication.mContext
				.getString(R.string.tweet_created_at_beautify_suffix);

		// Seconds.
		long diff = (now.getTime() - date.getTime()) / 1000;

		if (diff < 0) {
			diff = 0;
		}

		if (diff < 60) {
			return diff + sec + suffix;
		}

		// Minutes.
		diff /= 60;

		if (diff < 60) {
			return prefix + diff + min + suffix;
		}

		// Hours.
		diff /= 60;

		if (diff < 24) {
			return prefix + diff + hour + suffix;
		}

		return AGO_FULL_DATE_FORMATTER.format(date);
	}

	public static long getNowTime() {
		return Calendar.getInstance().getTime().getTime();
	}
}