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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();
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | 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" ); } }; //利用反射动态地改变CountDownTimer类的私有字段mCountdownInterval private void changeCountdownInterval( long time) { try { // 反射父类CountDownTimer的mCountdownInterval字段，动态改变回调频率 Class clazz = Class.forName( "android.os.CountDownTimer" ); Field field = clazz.getDeclaredField( "mCountdownInterval" ); //从Toast对象中获得mTN变量 field.setAccessible( true ); field.set(countDownTimer, time); } catch (Exception e) { Log.e( "Ye" , "反射类android.os.CountDownTimer.mCountdownInterval失败：" + e); } } //利用反射动态地改变CountDownTimer类的私有字段mMillisInFuture private void changeMillisInFuture( long time) { try { // 反射父类CountDownTimer的mMillisInFuture字段，动态改变定时总时间 Class clazz = Class.forName( "android.os.CountDownTimer" ); Field field = clazz.getDeclaredField( "mMillisInFuture" ); field.setAccessible( true ); field.set(countDownTimer, time); } catch (Exception e) { Log.e( "Ye" , "反射类android.os.CountDownTimer.mMillisInFuture失败： " + e); } } //调用方法 changeCountdownInterval( 500 ); changeMillisInFuture( 60000 ); timer.start(); |
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。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | 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。
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | 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
| 1 2 3 | tp_hour.setData(initTpTime( 0 , 24 )); tp_min.setData(initTpTime( 0 , 60 )); tp_sec.setData(initTpTime( 0 , 60 )); |
总结：其实倒计时在订单统一时间的时候是需要精确的计算，不然差的时间加上网络的推送延时是有可能影响结算结果的，以上方法希望能帮到你。