StringUtils.java

package com.charon.video.util;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Iterator;

import android.util.Log;

public class StringUtils {

    public static final SimpleDateFormat DATE_FORMAT_PART = new SimpleDateFormat(
            "HH:mm");

    public static String currentTimeString() {
        return DATE_FORMAT_PART.format(Calendar.getInstance().getTime());
    }

    public static String join(Object[] elements, CharSequence separator) {
        return join(Arrays.asList(elements), separator);
    }

    public static String join(Iterable<? extends Object> elements,
            CharSequence separator) {
        StringBuilder builder = new StringBuilder();

        if (elements != null) {
            Iterator<? extends Object> iter = elements.iterator();
            if (iter.hasNext()) {
                builder.append(String.valueOf(iter.next()));
                while (iter.hasNext()) {
                    builder.append(separator).append(
                            String.valueOf(iter.next()));
                }
            }
        }

        return builder.toString();
    }

    public static String fixLastSlash(String str) {
        String res = str == null ? "/" : str.trim() + "/";
        if (res.length() > 2 && res.charAt(res.length() - 2) == '/')
            res = res.substring(0, res.length() - 1);
        return res;
    }

    public static int convertToInt(String str) throws NumberFormatException {
        int s, e;
        for (s = 0; s < str.length(); s++)
            if (Character.isDigit(str.charAt(s)))
                break;
        for (e = str.length(); e > 0; e--)
            if (Character.isDigit(str.charAt(e - 1)))
                break;
        if (e > s) {
            try {
                return Integer.parseInt(str.substring(s, e));
            } catch (NumberFormatException ex) {
                Log.e("convertToInt", ex.toString());
                throw new NumberFormatException();
            }
        } else {
            throw new NumberFormatException();
        }
    }

    public static String generateTime(long time) {
        int totalSeconds = (int) (time / 1000);
        int seconds = totalSeconds % 60;
        int minutes = (totalSeconds / 60) % 60;
        int hours = totalSeconds / 3600;

        return hours > 0 ? String.format("%02d:%02d:%02d", hours, minutes,
                seconds) : String.format("%02d:%02d", minutes, seconds);
    }

}