Android Studio - 第四十四期 倒计时
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。
本文转自 吴雨声 51CTO博客，原文链接：http://blog.51cto.com/liangxiao/1950549，如需转载请自行联系原作者
