Android Studio四十四期 - 倒计时

满堂花醉三千客，一剑霜寒十四州。这篇文章主要讲述Android Studio四十四期 - 倒计时相关的知识，希望能为你提供帮助。
现在倒计时有很多种方法，这里给大家两个方法，代码经过洗礼：
1.CountDownTimer：调用的时候很简单：timer.start(); timer.cancel();

private TextView vertifyView; private CountDownTimer timer = new CountDownTimer(10000, 1000) { @Override public void onTick(long millisUntilFinished) { vertifyView.setText((millisUntilFinished / 1000) + "秒后可重发"); } @Override public void onFinish() { vertifyView.setEnabled(true); vertifyView.setText("获取验证码"); } };

附：这种方法只能支持30分钟的倒计时，否则会有延迟。下面是很精准的方法，就是复杂一些~

2.WeakReference：以系统每次更新时间的一秒的时间差来倒计时。

private H mHandler2 = new H(this); private static final int MSG_RUN = 189; private static final int DELAY_MILLIS = 1000; private long mCurrentTime; private static class H extends Handler { private WeakReference< MainActivity> mActivity; private long mNextTime; public H(MainActivity activity) { mActivity = new WeakReference< MainActivity> (activity); } @Override public void handleMessage(Message msg) { super.handleMessage(msg); MainActivity activity = mActivity.get(); if (activity == null || msg.what != MSG_RUN) { return; } if (activity.decrTime(SystemClock.uptimeMillis() - mNextTime)) { mNextTime = SystemClock.uptimeMillis(); sendEmptyMessageDelayed(MSG_RUN, DELAY_MILLIS); } } }

支持传int hour int min int second和直接传时间戳long 60000 ms,另外给大家提供一个时间的util，希望能帮到你们。

package com.example.p027_daojishi.util; import java.util.ArrayList; import java.util.List; public class TimeUtil { /** * @param ms * @return result[day, hour, minute, second] */ public static long[] compute(long ms) { long[] result = new long[4]; // day result[0] = ms / (24 * 60 * 60 * 1000); ms = ms % (24 * 60 * 60 * 1000); // hour result[1] = ms / (60 * 60 * 1000); ms = ms % (60 * 60 * 1000); // minute result[2] = ms / (60 * 1000); ms = ms % (60 * 1000); // second result[3] = ms / 1000; return result; } /** * @param * @return void * @throws Exception * @throws * @Description: 设置倒计时的时长 */ public static int[] setTime(int hour) { int[] result = new int[2]; //hour 十位 result[0] = hour / 10; //hour 个位 result[1] = hour - hour / 10 * 10; return result; } /** * TimePicker设置初始化数据bufen * * @param hour * @param num */ public static List< String> initTpTime(final int hour, final int num) { List< String> data = new ArrayList< String> () { { for (int i = hour; i < num; i++) { add(i + ""); } } }; return data; } /** * TimePicker设置起始数据bufen * tp_hour.setData(setTpTime(hour, 24)); * tp_min.setData(setTpTime(min, 60)); * tp_sec.setData(setTpTime(sec, 60)); * hour=12 num=24 * min=59 num=60 * sec=59 num=60 * * @param hour * @param num */ public static List< String> setTpTime(final int hour, final int num) { List< String> data = new ArrayList< String> () { { for (int i = hour; i < num; i++) { add(i + ""); } for (int i = 0; i < hour; i++) { add(i + ""); } } }; return data; } /** * 获取倒计时布局的hour min sec bufen 10 : 12 : 59 02 : 01 : 02 转成 long * * @param timeStr * @return */ public static long getTimeStrSec(String timeStr) { if (timeStr == null || timeStr.length() < 5) { return -1L; } String[] times = timeStr.split(":"); if (times == null || times.length != 3) { return -1L; } if (times[0] == null || times[1] == null || times[2] == null) { return -1L; } long hour = Long.parseLong(times[0].trim()); long minute = Long.parseLong(times[1].trim()); long second = Long.parseLong(times[2].trim()); return hour * 60L * 60L + minute * 60 + second; } /** * 1 2 3 转 01 02 03 * * @param i * @return */ public static String time_change_one(long i) { String s = String.format("%02d", i); return s; } /** * 01 02 12 zhuang 1 2 12 * * @param data * @return */ public static String time_change_two(String data) { char[] chars = data.toCharArray(); if (String.valueOf(chars[0]).equals("0")) { data = String.valueOf(chars[1]); } else { data = data; } return data; }}

附：TimerPicker初始化