package com.yixia.camera.util;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.Iterator;
import java.util.TimeZone;
import android.text.TextPaint;
import android.text.TextUtils;
/**
* 字符串工具类
*
* @author tangjun
*
*/
public class StringUtils {
public static final String EMPTY = "";
private static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd";
private static final String DEFAULT_DATETIME_PATTERN = "yyyy-MM-dd hh:mm:ss";
/** 用于生成文件 */
private static final String DEFAULT_FILE_PATTERN = "yyyy-MM-dd-HH-mm-ss";
private static final double KB = 1024.0;
private static final double MB = 1048576.0;
private static final double GB = 1073741824.0;
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 char chatAt(String pinyin, int index) {
if (pinyin != null && pinyin.length() > 0)
return pinyin.charAt(index);
return ' ';
}
/** 获取字符串宽度 */
public static float GetTextWidth(String Sentence, float Size) {
if (isEmpty(Sentence))
return 0;
TextPaint FontPaint = new TextPaint();
FontPaint.setTextSize(Size);
return FontPaint.measureText(Sentence.trim()) + (int) (Size * 0.1); // 留点余地
}
/**
* 格式化日期字符串
*
* @param date
* @param pattern
* @return
*/
public static String formatDate(Date date, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
return format.format(date);
}
public static String formatDate(long date, String pattern) {
SimpleDateFormat format = new SimpleDateFormat(pattern);
return format.format(new Date(date));
}
/**
* 格式化日期字符串
*
* @param date
* @return 例如2011-3-24
*/
public static String formatDate(Date date) {
return formatDate(date, DEFAULT_DATE_PATTERN);
}
public static String formatDate(long date) {
return formatDate(new Date(date), DEFAULT_DATE_PATTERN);
}
/**
* 获取当前时间 格式为yyyy-MM-dd 例如2011-07-08
*
* @return
*/
public static String getDate() {
return formatDate(new Date(), DEFAULT_DATE_PATTERN);
}
/** 生成一个文件名，不含后缀 */
public static String createFileName() {
Date date = new Date(System.currentTimeMillis());
SimpleDateFormat format = new SimpleDateFormat(DEFAULT_FILE_PATTERN);
return format.format(date);
}
/**
* 获取当前时间
*
* @return
*/
public static String getDateTime() {
return formatDate(new Date(), DEFAULT_DATETIME_PATTERN);
}
/**
* 格式化日期时间字符串
*
* @param date
* @return 例如2011-11-30 16:06:54
*/
public static String formatDateTime(Date date) {
return formatDate(date, DEFAULT_DATETIME_PATTERN);
}
public static String formatDateTime(long date) {
return formatDate(new Date(date), DEFAULT_DATETIME_PATTERN);
}
/**
* 格林威时间转换
*
* @param gmt
* @return
*/
public static String formatGMTDate(String gmt) {
TimeZone timeZoneLondon = TimeZone.getTimeZone(gmt);
return formatDate(Calendar.getInstance(timeZoneLondon)
.getTimeInMillis());
}
/**
* 拼接数组
*
* @param array
* @param separator
* @return
*/
public static String join(final ArrayList<String> array,
final String separator) {
StringBuffer result = new StringBuffer();
if (array != null && array.size() > 0) {
for (String str : array) {
result.append(str);
result.append(separator);
}
result.delete(result.length() - 1, result.length());
}
return result.toString();
}
public static String join(final Iterator<String> iter,
final String separator) {
StringBuffer result = new StringBuffer();
if (iter != null) {
while (iter.hasNext()) {
String key = iter.next();
result.append(key);
result.append(separator);
}
if (result.length() > 0)
result.delete(result.length() - 1, result.length());
}
return result.toString();
}
/**
* 判断字符串是否为空
*
* @param str
* @return
*/
public static boolean isEmpty(String str) {
return str == null || str.length() == 0 || str.equalsIgnoreCase("null");
}
public static boolean isNotEmpty(String str) {
return !isEmpty(str);
}
/**
*
* @param str
* @return
*/
public static String trim(String str) {
return str == null ? EMPTY : str.trim();
}
/**
* 转换时间显示
*
* @param time
* 毫秒
* @return
*/
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);
}
public static boolean isBlank(String s) {
return TextUtils.isEmpty(s);
}
/** 根据秒速获取时间格式 */
public static String gennerTime(int totalSeconds) {
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
return String.format("%02d:%02d", minutes, seconds);
}
/**
* 转换文件大小
*
* @param size
* @return
*/
public static String generateFileSize(long size) {
String fileSize;
if (size < KB)
fileSize = size + "B";
else if (size < MB)
fileSize = String.format("%.1f", size / KB) + "KB";
else if (size < GB)
fileSize = String.format("%.1f", size / MB) + "MB";
else
fileSize = String.format("%.1f", size / GB) + "GB";
return fileSize;
}
/** 查找字符串，找到返回，没找到返回空 */
public static String findString(String search, String start, String end) {
int start_len = start.length();
int start_pos = StringUtils.isEmpty(start) ? 0 : search.indexOf(start);
if (start_pos > -1) {
int end_pos = StringUtils.isEmpty(end) ? -1 : search.indexOf(end,
start_pos + start_len);
if (end_pos > -1)
return search.substring(start_pos + start.length(), end_pos);
}
return "";
}
/**
* 截取字符串
*
* @param search
* 待搜索的字符串
* @param start
* 起始字符串 例如：<title>
* @param end
* 结束字符串 例如：</title>
* @param defaultValue
* @return
*/
public static String substring(String search, String start, String end,
String defaultValue) {
int start_len = start.length();
int start_pos = StringUtils.isEmpty(start) ? 0 : search.indexOf(start);
if (start_pos > -1) {
int end_pos = StringUtils.isEmpty(end) ? -1 : search.indexOf(end,
start_pos + start_len);
if (end_pos > -1)
return search.substring(start_pos + start.length(), end_pos);
else
return search.substring(start_pos + start.length());
}
return defaultValue;
}
/**
* 截取字符串
*
* @param search
* 待搜索的字符串
* @param start
* 起始字符串 例如：<title>
* @param end
* 结束字符串 例如：</title>
* @return
*/
public static String substring(String search, String start, String end) {
return substring(search, start, end, "");
}
/**
* 拼接字符串
*
* @param strs
* @return
*/
public static String concat(String... strs) {
StringBuffer result = new StringBuffer();
if (strs != null) {
for (String str : strs) {
if (str != null)
result.append(str);
}
}
return result.toString();
}
/**
* Helper function for making null strings safe for comparisons, etc.
*
* @return (s == null) ? "" : s;
*/
public static String makeSafe(String s) {
return (s == null) ? "" : s;
}
}