多线程实现方式implements Runnable 或 extends Thread
1)Activity.runOnUiThread(Runnable)AsyncTask
优点:
2、简述android下的定时器有哪些实现方法
android定时器实现
public class NumberToCN {(参考) /** * 汉语中数字大写 */ private static final String[] CN_UPPER_NUMBER = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" }; /** * 汉语中货币单位大写,这样的设计类似于占位符 */ private static final String[] CN_UPPER_MONETRAY_UNIT = { "分", "角", "元", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟", "兆", "拾", "佰", "仟" }; /** * 特殊字符:整 */ private static final String CN_FULL = "整"; /** * 特殊字符:负 */ private static final String CN_NEGATIVE = "负"; /** * 金额的精度,默认值为2 */ private static final int MONEY_PRECISION = 2; /** * 特殊字符:零元整 */ private static final String CN_ZEOR_FULL = "零元" + CN_FULL; /** * 把输入的金额转换为汉语中人民币的大写 * * @param numberOfMoney * 输入的金额 * @return 对应的汉语大写 */ public static String number2CNMontrayUnit(BigDecimal numberOfMoney) { StringBuffer sb = new StringBuffer(); // -1, 0, or 1 as the value of this BigDecimal is negative, zero, or // positive. int signum = numberOfMoney.signum(); // 零元整的情况 if (signum == 0) { return CN_ZEOR_FULL; } //这里会进行金额的四舍五入 long number = numberOfMoney.movePointRight(MONEY_PRECISION) .setScale(0, 4).abs().longValue(); // 得到小数点后两位值 long scale = number % 100; int numUnit = 0; int numIndex = 0; boolean getZero = false; // 判断最后两位数,一共有四中情况:00 = 0, 01 = 1, 10, 11 if (!(scale > 0)) { numIndex = 2; number = number / 100; getZero = true; } if ((scale > 0) && (!(scale % 10 > 0))) { numIndex = 1; number = number / 10; getZero = true; } int zeroSize = 0; while (true) { if (number <= 0) { break; } // 每次获取到最后一个数 numUnit = (int) (number % 10); if (numUnit > 0) { if ((numIndex == 9) && (zeroSize >= 3)) { sb.insert(0, CN_UPPER_MONETRAY_UNIT[6]); } if ((numIndex == 13) && (zeroSize >= 3)) { sb.insert(0, CN_UPPER_MONETRAY_UNIT[10]); } sb.insert(0, CN_UPPER_MONETRAY_UNIT[numIndex]); sb.insert(0, CN_UPPER_NUMBER[numUnit]); getZero = false; zeroSize = 0; } else { ++zeroSize; if (!(getZero)) { sb.insert(0, CN_UPPER_NUMBER[numUnit]); } if (numIndex == 2) { if (number > 0) { sb.insert(0, CN_UPPER_MONETRAY_UNIT[numIndex]); } } else if (((numIndex - 2) % 4 == 0) && (number % 1000 > 0)) { sb.insert(0, CN_UPPER_MONETRAY_UNIT[numIndex]); } getZero = true; } // 让number每次都去掉最后一个数 number = number / 10; ++numIndex; } // 如果signum == -1,则说明输入的数字为负数,就在最前面追加特殊字符:负 if (signum == -1) { sb.insert(0, CN_NEGATIVE); } // 输入的数字小数点后两位为"00"的情况,则要在最后追加特殊字符:整 if (!(scale > 0)) { sb.append(CN_FULL); } return sb.toString(); } public static void main(String[] args) { double money = 2020004.01; BigDecimal numberOfMoney = new BigDecimal(money); String s = NumberToCN.number2CNMontrayUnit(numberOfMoney); System.out.println("你输入的金额为:【"+ money +"】 ------ [" +s.toString()+"]"); } }