金钱转换

public class MoneyFormatUtil {
　　//分转换成元
    public static String format_fen_as_yuan(int money_fen) {
        float money_yuan = new BigDecimal(money_fen / 100f).setScale(2, BigDecimal.ROUND_HALF_UP).floatValue();
        return format(money_yuan);
    }

    /**
     * @param @param  money
     * @param @return
     * @return String
     * @throws
     * @Description: 格式化，保留小数点后两位
     */
    public static String format(float money_yuan) {
        String str = money_yuan + "";
        int pos = str.indexOf(".");
        if (pos < 0)
            return str;
        else {
            String pre = str.substring(0, pos);
            String last = str.substring(pos + 1);
            try {
                int xiaoshu = Integer.parseInt(last);
                if (xiaoshu == 0) {
                    return pre;
                }
            } catch (NumberFormatException ex) {
                ex.printStackTrace();
            }
        }
        DecimalFormat df = new DecimalFormat("##0.00");
        return df.format(money_yuan);
    }
}

//元转换为分 用法Money.fromYuan(yuan).fen();
public class Money implements Serializable, Parcelable {
    BigDecimal value_bigDecimal;
    int value_fen;
    float value_yuan;

    public Money(int value_fen) {
        this.value_fen = value_fen;
        value_bigDecimal = new BigDecimal(value_fen);
        this.value_yuan = value_bigDecimal.setScale(2, BigDecimal.ROUND_HALF_UP).floatValue();
    }

    public Money(Parcel in) {
        this(in.readInt());
    }

    public static Money fromFen(String fen) {
        return new Money(Integer.parseInt(fen));
    }

    public static Money fromFen(int fen) {
        return new Money(fen);
    }

    public static Money fromYuan(String yuan_money_str) {
        float money_shishou_yuan = Float.parseFloat(yuan_money_str);
        return fromYuan(money_shishou_yuan);
    }
　
    public static Money fromYuan(float money_shishou_yuan) {
        int fen = new BigDecimal(money_shishou_yuan).multiply(new BigDecimal(100)).setScale(2, BigDecimal.ROUND_HALF_UP).intValue();
        Money money = new Money(fen);
        return money;
    }

    public int fen() {
        return value_fen;
    }

    public float yuan() {
        return value_yuan;
    }

    public BigDecimal toBigDecimalValue() {
        return value_bigDecimal;
    }

    /**
     * 显示金额，比如: 3.1 （元，不包含单位）
     *
     * @return
     */
    public String toStringAsYuan() {
        return MoneyFormatUtil.format_fen_as_yuan(value_fen);
    }

    public Money multiply(BigDecimal num) {
        return new Money(new BigDecimal(value_fen).multiply(num).intValue());
    }

    public Money divide(BigDecimal num) {
        return new Money(new BigDecimal(value_fen).divide(num).intValue());
    }

    public Money add(BigDecimal num) {
        return new Money(new BigDecimal(value_fen).add(num).intValue());
    }

    public Money subtract(BigDecimal num) {
        return new Money(new BigDecimal(value_fen).subtract(num).intValue());
    }

    @Override
    public String toString() {
        return toStringAsYuan();
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(value_fen);
    }

    public static final Parcelable.Creator<Money> CREATOR = new Parcelable.Creator<Money>() {
        public Money createFromParcel(Parcel in) {
            return new Money(in);
        }

        public Money[] newArray(int size) {
            return new Money[size];
        }
    };

}