本次讲述的是JAVA中各种单位之间的换算，其中包括货币单位的换算，时间单位的换算，以及小数点的保留和小数点与百分号之间的换算，都是从项目中抽取出来的，可能不太全面，把现有的先记录在这里，后面再继续补充。
（一）首先，这里是货币之间单位的换算：
/**
* 货币转换 1000000 return 1百万 10000 return 1万 1000 return 1千
*
* @param amount
* @return
*/
public static HashMap<String, String> amountConversionMap(long amount) {
HashMap<String, String> map = new HashMap<String, String>();
if (amount >= 1000000) {
map.put("amount", amount / 1000000 + "");
map.put("amoun_unit", "百万");
return map;
}
if (amount >= 10000) {
map.put("amount", amount / 10000 + "");
map.put("amoun_unit", "万元");
return map;
}
if (amount >= 1000) {
map.put("amount", amount / 1000 + "");
map.put("amoun_unit", "千元");
return map;
}
map.put("amount", amount + "");
map.put("amoun_unit", "元");
return map;
}
/**
* 1000000 return 1百万 10000 return 1万 1000 return 1千
*
* @param amount
* @return
*/
public static String amountConversion(long amount) {
if (amount >= 1000000) {
return amount / 1000000 + "百万";
}
if (amount >= 10000) {
return amount / 10000 + "万元";
}
if (amount >= 1000) {
return amount / 1000 + "千元";
}
return amount + "元";
}
/**
* 10000 return 10,000
*
* @param amount
* @return
*/
public static String amountConversionFormat(long amount) {
return NumberFormat.getInstance().format(amount);
}
/**
* 10000 return 10,000
*
* @param amount
* @return
*/
public static String amountConversionFormat(double amount) {
return NumberFormat.getInstance().format(amount);
}
都是一些常见的单位转换，还有国际标准的金额形式。
（二）然后是时间单位上的换算：
/**
* 1 Year 1年 1 Month 1个月 1 Day 1天
*
* @param period
* @param periodUnit
* @return
*/
public static String periodConversion(int period, String periodUnit) {
if ("Year".equals(periodUnit)) {
return period + "年";
}
if ("Month".equals(periodUnit)) {
return period + "个月";
}
if ("Day".equals(periodUnit)) {
return period + "天";
}
return period + "";
}
/**
* 1 Year 1年 1 Month 1个月 1 Day 1天
*
* @param period
* @param periodUnit
* @return
*/
public static String periodConversion(String periodUnit) {
if ("Year".equals(periodUnit)) {
return "年";
}
if ("Month".equals(periodUnit)) {
return "个月";
}
if ("Day".equals(periodUnit)) {
return "天";
}
return "";
}
/**
* ep: xx月xx日 xx:xx
*
* get time ,only have month,date,hour and minutes
* @param time
* @return
*/
public static String getDateStringMonthDayTime(long time) {
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(time);
StringBuilder builder = new StringBuilder();
int month = cal.get(Calendar.MONTH)+1;
builder.append(month);
builder.append("月");
builder.append(cal.get(Calendar.DATE));
builder.append("日");
builder.append(" ");
builder.append(cal.get(Calendar.HOUR_OF_DAY));
builder.append(":");
builder.append(cal.get(Calendar.MINUTE));
return builder.toString();
}
/**
* 123123123 2015-05-18 10:54:27
*
* @param time
* @return
*/
public static String getDateString(long time) {
SimpleDateFormat myFmt = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
return myFmt.format(new Date(time));
}
public static String getDateStringMinute(long time) {
SimpleDateFormat myFmt = new SimpleDateFormat("yyyy-MM-dd HH:mm");
return myFmt.format(new Date(time));
}
/**
* ep: xx月xx日
* @param time longtime
* @return
*/
public static String getDateStringMonthAndDay(long time) {
Calendar cal = Calendar.getInstance();
cal.setTimeInMillis(time);
StringBuilder sb = new StringBuilder();
sb.append(cal.get(Calendar.MONTH)+1);
sb.append("月");
sb.append(cal.get(Calendar.DAY_OF_MONTH));
sb.append("日");
return sb.toString();
}
/**
* 123123123 2015-05-18
*
* @param time
* @return
*/
public static String getDateStringDay(long time) {
SimpleDateFormat myFmt = new SimpleDateFormat("yyyy-MM-dd");
return myFmt.format(new Date(time));
}
public static boolean isDouble(String value) {
try {
Double.parseDouble(value);
return true;
} catch (NumberFormatException e) {
return false;
}
}年月日，时分秒，基本也都齐了。
（三）最后一个是小数点的各种保留方式以及小数与百分数之间的转换
/* *//**
* 9.658 return 9.65
*/
/*
* public static BigDecimal scale(double scale){ return new
* BigDecimal(scale).setScale(2, BigDecimal.ROUND_DOWN); }
*//**
* 9.658 return 9.65
*/
public static BigDecimal scale(BigDecimal scale) {
return scale.setScale(2, BigDecimal.ROUND_DOWN);
}
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
/**
* string型保留两位小数
* @param value
* @return
*/
public static String CovertTwoDecimal(Object value) {
DecimalFormat df = new DecimalFormat("######0.00");
return df.format(Double.parseDouble((String) value));
}
/**
* double型保留两位小数
*/
public static String dobCoverTwoDecimal (double value) {
DecimalFormat df = new DecimalFormat("######0.00");
return df.format(value);
}
/**
* 小数转百分数
*
*/
public static String changePointToPercent(Double point) {
return String.valueOf(point*100);
}
/**
* 0.00001 return 0.01%
*
* @param percent
* @return
*/
public static String percentConversionFormat(double percent){
NumberFormat percentNF = NumberFormat.getPercentInstance();
percentNF.setMaximumFractionDigits(2);
return percentNF.format(percent);
}