利用RecyclerView实现一个非常简单的列表倒计时
一、先上效果图
二、GitHub
代码地址，欢迎指正https://github.com/MNXP/Countdown
三、思路
在adapter中设置timer倒计时，然后利用RecyclerView更新单个item特性实现
四、实现
1）变量
useTime倒计时时间
timeFlag用来判断是否有倒计时，倒计时结束更新UI
2）倒计时
遍历list，设置时间useTime-1000，然后判断时间和timeFlag更新显示
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
| private void startTime() {
new Timer().schedule(new TimerTask() {
@Override
public void run() {
((Activity) mContext).runOnUiThread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < mTimeDownBeanList.size(); i++) {
long useTime = mTimeDownBeanList.get(i).getUseTime();
if (useTime > 1000) {
useTime -= 1000;
mTimeDownBeanList.get(i).setUseTime(useTime);
if (useTime <= 1000 && mTimeDownBeanList.get(i).isTimeFlag()) {
mTimeDownBeanList.get(i).setTimeFlag(false);
CountDownAdapter.this.notifyItemChanged(i);
}else {
mTimeDownBeanList.get(i).setTimeFlag(true);
CountDownAdapter.this.notifyItemChanged(i);
}
}
}
}
});
}
}, 0, 1000);
}
|
3）常规操作（设置倒计时时间）
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
| private void setTime(ViewHolder holder, int position) throws ParseException{
TimeDownBean timeDownBean = mTimeDownBeanList.get(position);
if (timeDownBean.getUseTime() > 1000) {
holder.timeTv.setVisibility(View.VISIBLE);
long useTime = timeDownBean.getUseTime();
useTime = useTime / 1000;
setTimeShow(useTime, holder);
}else {
holder.timeTv.setVisibility(View.GONE);
}
}
private void setTimeShow(long useTime, ViewHolder holder) {
int hour = (int) (useTime / 3600 );
int min = (int) (useTime / 60 % 60);
int second = (int) (useTime % 60);
int day = (int) (useTime / 3600 / 24);
String mDay, mHour, mMin, mSecond;//天，小时，分钟，秒
second--;
if (second < 0) {
min--;
second = 59;
if (min < 0) {
min = 59;
hour--;
}
}
if (hour < 10) {
mHour = "0" + hour;
} else {
mHour = "" + hour;
}
if (min < 10) {
mMin = "0" + min;
} else {
mMin = "" + min;
}
if (second < 10) {
mSecond = "0" + second;
} else {
mSecond = "" + second;
}
String strTime = "上架倒计时 " +mHour + ":" + mMin + ":" + mSecond + "";
holder.timeTv.setText(strTime);
}
|
4）注意
防止更新item时防止抖动
((SimpleItemAnimator) mRecycleListView.getItemAnimator()).setSupportsChangeAnimations(false);
5）Adapter完整代码
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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
| public class CountDownAdapter extends RecyclerView.Adapter {
private Context mContext;
private List<TimeDownBean> mTimeDownBeanList;
public CountDownAdapter(Context context,List<TimeDownBean> mTimeDownBeanList){
this.mContext = context;
this.mTimeDownBeanList = mTimeDownBeanList;
startTime();
}
/**
* 列表倒计时
*/
private void startTime() {
new Timer().schedule(new TimerTask() {
@Override
public void run() {
((Activity) mContext).runOnUiThread(new Runnable() {
@Override
public void run() {
for (int i = 0; i < mTimeDownBeanList.size(); i++) {
long useTime = mTimeDownBeanList.get(i).getUseTime();
if (useTime > 1000) {
useTime -= 1000;
mTimeDownBeanList.get(i).setUseTime(useTime);
if (useTime <= 1000 && mTimeDownBeanList.get(i).isTimeFlag()) {
mTimeDownBeanList.get(i).setTimeFlag(false);
CountDownAdapter.this.notifyItemChanged(i);
}else {
mTimeDownBeanList.get(i).setTimeFlag(true);
CountDownAdapter.this.notifyItemChanged(i);
}
}
}
}
});
}
}, 0, 1000);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = View.inflate(mContext,R.layout.count_down_item,null);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof ViewHolder){
ViewHolder viewHolder = (ViewHolder) holder;
TimeDownBean timeDownBean = mTimeDownBeanList.get(position);
viewHolder.contentTv.setText(timeDownBean.getContent());
try {
setTime(viewHolder, position);
} catch (ParseException e) {
e.printStackTrace();
}
}
}
private void setTime(ViewHolder holder, int position) throws ParseException{
TimeDownBean timeDownBean = mTimeDownBeanList.get(position);
if (timeDownBean.getUseTime() > 1000) {
holder.timeTv.setVisibility(View.VISIBLE);
long useTime = timeDownBean.getUseTime();
useTime = useTime / 1000;
setTimeShow(useTime, holder);
}else {
holder.timeTv.setVisibility(View.GONE);
}
}
private void setTimeShow(long useTime, ViewHolder holder) {
int hour = (int) (useTime / 3600 );
int min = (int) (useTime / 60 % 60);
int second = (int) (useTime % 60);
int day = (int) (useTime / 3600 / 24);
String mDay, mHour, mMin, mSecond;//天，小时，分钟，秒
second--;
if (second < 0) {
min--;
second = 59;
if (min < 0) {
min = 59;
hour--;
}
}
if (hour < 10) {
mHour = "0" + hour;
} else {
mHour = "" + hour;
}
if (min < 10) {
mMin = "0" + min;
} else {
mMin = "" + min;
}
if (second < 10) {
mSecond = "0" + second;
} else {
mSecond = "" + second;
}
String strTime = "上架倒计时 " +mHour + ":" + mMin + ":" + mSecond + "";
holder.timeTv.setText(strTime);
}
@Override
public int getItemCount() {
return mTimeDownBeanList!=null?mTimeDownBeanList.size():0;
}
private class ViewHolder extends RecyclerView.ViewHolder{
private TextView contentTv;
private TextView timeTv;
private ViewHolder(View itemView) {
super(itemView);
init(itemView);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (itemClickListener!=null){
itemClickListener.onItemClick(v,getLayoutPosition());
}
}
});
}
private void init(View itemView) {
contentTv = (TextView)itemView.findViewById(R.id.content_tv);
timeTv = (TextView)itemView.findViewById(R.id.time_tv);
}
}
//对外部暴漏点击事件接口
public interface OnItemClickListener{
void onItemClick(View v,int position);
}
public OnItemClickListener itemClickListener;
public void setItemClickListener(OnItemClickListener itemClickListener) {
this.itemClickListener = itemClickListener;
}
}
|
如有意见和建议，及时沟通。