怎么在Android中使用wheelView实现自定义日期选择器？针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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一.首先要了解WheelView为我们提供了什么：
除了我写的”DateObject”与”StringWheelAdapter”，其余都是WheelView提供的，
1. WheelView.java ：可滚动的组件
主要方法：
setAdapter(new StringWheelAdapter(dateList, 7)); //设置Adapter setVisibleItems(3); //设置显示几行数据 setCyclic(true); //设置是否循环显示数据 addChangingListener(onDaysChangedListener) //设置滑动监听器
2. WheelAdapter.java : 滑动组件的适配器的接口，子类适配器用于装载数据
public interface WheelAdapter {
/**
* Gets items count
* @return the count of wheel items
*/
public int getItemsCount();
/**
* Gets a wheel item by index.
*
* @param index the item index
* @return the wheel item text or null
*/
public String getItem(int index);
/**
* Gets maximum item length. It is used to determine the wheel width.
* If -1 is returned there will be used the default wheel width.
*
* @return the maximum item length or -1
*/
public int getMaximumLength();
}3. OnWheelChangedListener.java : 滑动监听器接口
public interface OnWheelChangedListener {
/**
* Callback method to be invoked when current item changed
* @param wheel the wheel view whose state has changed
* @param oldValue the old value of current item
* @param newValue the new value of current item
*/
void onChanged(WheelView wheel, int oldValue, int newValue);
}4.OnWheelScrollListener.java ：滚动监听器接口(暂时没用到)
5.NumericWheelAdapter.java : 当滚动内容为纯数字时调用的适配器
6.DateObject.java : 日期实体类，用于存储、获取选择的数据
package kankan.wheel.widget;
import java.util.Calendar;
public class DateObject extends Object{
private int year ;
private int month;
private int day;
private int week;
private int hour;
private int minute;
private String listItem;
/**
* 日期对象的4个参数构造器，用于设置日期
* @param year
* @param month
* @param day
* @author sxzhang
*/
public DateObject(int year2, int month3, int day2,int week2) {
super();
this.year = year2;
int maxDayOfMonth = Calendar.getInstance().getActualMaximum(Calendar.DAY_OF_MONTH);
if(day2 > maxDayOfMonth){
this.month = month3 + 1;
this.day = day2 % maxDayOfMonth;
}else{
this.month = month3;
this.day = day2;
}
this.week = week2 % 7 == 0 ? 7 : week2 % 7;
if(day == Calendar.getInstance().get(Calendar.DAY_OF_MONTH)){
this.listItem = String.format("%02d", this.month) +"月" + String.format("%02d", this.day) +
"日 "+ " 今天 ";
}else{
this.listItem = String.format("%02d", this.month) +"月" + String.format("%02d", this.day) +
"日 "+ getDayOfWeekCN(week);
}
}
/**
* 日期对象的2个参数构造器，用于设置时间
* @param hour2
* @param minute2
* @param isHourType true:传入的是hour; false: 传入的是minute
* @author sxzhang
*/
public DateObject(int hour2,int minute2,boolean isHourType) {
super();
if(isHourType == true && hour2 != -1){ //设置小时
if(hour2 > 24){
this.hour = hour2 % 24;
}else
this.hour = hour2;
this.listItem = this.hour + "时";
}else if(isHourType == false && minute2 != -1){ //设置分钟
if(minute2 > 60)
this.minute = minute2 % 60;
else
this.minute = minute2;
this.listItem = this.minute + "分";
}
}
public int getHour() {
return hour;
}
public void setHour(int hour) {
this.hour = hour;
}
public int getMinute() {
return minute;
}
public void setMinute(int minute) {
this.minute = minute;
}
public int getWeek() {
return week;
}
public void setWeek(int week) {
this.week = week;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public int getMonth() {
return month;
}
public void setMonth(int month) {
this.month = month;
}
public int getDay() {
return day;
}
public void setDay(int day) {
this.day = day;
}
public String getListItem() {
return listItem;
}
public void setListItem(String listItem) {
this.listItem = listItem;
}
/**
* 根据day_of_week得到汉字星期
* @return
*/
public static String getDayOfWeekCN(int day_of_week){
String result = null;
switch(day_of_week){
case 1:
result = "星期日";
break;
case 2:
result = "星期一";
break;
case 3:
result = "星期二";
break;
case 4:
result = "星期三";
break;
case 5:
result = "星期四";
break;
case 6:
result = "星期五";
break;
case 7:
result = "星期六";
break;
default:
break;
}
return result;
}
}7.StringWheelAdapter.java :一会儿将定义的滚动内容为字符串的适配器，当内容为字符串时我们就可以随意拓展滑动部分的内容
package kankan.wheel.widget;
import java.util.ArrayList;
/**
* The simple String Array wheel adapter
*
*/
public class StringWheelAdapter implements WheelAdapter {
/** The default items length */
public static final int DEFAULT_LENGTH = -1;
// items
private ArrayList list;
// length
private int length;
/**
* Constructor
* @param items the items
* @param length the max items length
*/
public StringWheelAdapter(ArrayList list, int length) {
this.list = list;
this.length = length;
}
@Override
public String getItem(int index) {
if (index >= 0 && index < list.size()) {
return list.get(index).getListItem();
}
return null;
}
@Override
public int getItemsCount() {
return list.size();
}
@Override
public int getMaximumLength() {
return length;
}
} 二.了解以后就可以使用他定义我们需要的了。
1.首先要做的是这个效果的部分：
我们将其命名为DatePicker：
package com.sxkeji.timeswitch.widget;
import java.util.ArrayList;
import java.util.Calendar;
import kankan.wheel.widget.DateObject;
import kankan.wheel.widget.OnWheelChangedListener;
import kankan.wheel.widget.StringWheelAdapter;
import kankan.wheel.widget.WheelView;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;
/**
* 自定义的日期选择器
* @author sxzhang
*
*/
public class DatePicker extends LinearLayout {
private Calendar calendar = Calendar.getInstance();
private WheelView newDays;
private ArrayList dateList ;
private OnChangeListener onChangeListener; //onChangeListener
private final int MARGIN_RIGHT = 20;
private DateObject dateObject; //日期数据对象
//Constructors
public DatePicker(Context context) {
super(context);
init(context);
}
public DatePicker(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
/**
* 初始化
* @param context
*/
private void init(Context context){
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH) + 1;
int day = calendar.get(Calendar.DAY_OF_MONTH);
int week = calendar.get(Calendar.DAY_OF_WEEK);
dateList = new ArrayList();
for (int i = 0; i < 7; i++) {
dateObject = new DateObject(year, month, day+i, week+i);
dateList.add(dateObject);
}
newDays = new WheelView(context);
LayoutParams newDays_param = new LayoutParams(300,LayoutParams.WRAP_CONTENT);
newDays_param.setMargins(0, 0, MARGIN_RIGHT, 0);
newDays.setLayoutParams(newDays_param);
newDays.setAdapter(new StringWheelAdapter(dateList, 7));
newDays.setVisibleItems(3);
newDays.setCyclic(true);
newDays.addChangingListener(onDaysChangedListener);
addView(newDays);
}
/**
* 滑动改变监听器
*/
private OnWheelChangedListener onDaysChangedListener = new OnWheelChangedListener(){
@Override
public void onChanged(WheelView mins, int oldValue, int newValue) {
calendar.set(Calendar.DAY_OF_MONTH, newValue + 1);
change();
}
};
/**
* 滑动改变监听器回调的接口
*/
public interface OnChangeListener {
void onChange(int year, int month, int day, int day_of_week);
}
/**
* 设置滑动改变监听器
* @param onChangeListener
*/
public void setOnChangeListener(OnChangeListener onChangeListener){
this.onChangeListener = onChangeListener;
}
/**
* 滑动最终调用的方法
*/
private void change(){
if(onChangeListener!=null){
onChangeListener.onChange(
dateList.get(newDays.getCurrentItem()).getYear(),
dateList.get(newDays.getCurrentItem()).getMonth(),
dateList.get(newDays.getCurrentItem()).getDay(),
dateList.get(newDays.getCurrentItem()).getWeek());
}
}
/**
* 根据day_of_week得到汉字星期
* @return
*/
public static String getDayOfWeekCN(int day_of_week){
String result = null;
switch(day_of_week){
case 1:
result = "星期日";
break;
case 2:
result = "星期一";
break;
case 3:
result = "星期二";
break;
case 4:
result = "星期三";
break;
case 5:
result = "星期四";
break;
case 6:
result = "星期五";
break;
case 7:
result = "星期六";
break;
default:
break;
}
return result;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
} 2.然后要做的是这个效果的部分
我们命名为TimePicker:
package com.sxkeji.timeswitch.widget;
import java.util.ArrayList;
import java.util.Calendar;
import kankan.wheel.widget.DateObject;
import kankan.wheel.widget.OnWheelChangedListener;
import kankan.wheel.widget.StringWheelAdapter;
import kankan.wheel.widget.WheelView;
import android.content.Context;
import android.util.AttributeSet;
import android.widget.LinearLayout;
/**
* 自定义的时间选择器
* @author sxzhang
*
*/
public class TimePicker extends LinearLayout{
private Calendar calendar = Calendar.getInstance();
private WheelView hours, mins; //Wheel picker
private OnChangeListener onChangeListener; //onChangeListener
private final int MARGIN_RIGHT = 15; //调整文字右端距离
private ArrayList hourList,minuteList;
private DateObject dateObject; //时间数据对象
//Constructors
public TimePicker(Context context) {
super(context);
init(context);
}
public TimePicker(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
/**
* 初始化
* @param context
*/
private void init(Context context){
int hour = calendar.get(Calendar.HOUR_OF_DAY);
int minute = calendar.get(Calendar.MINUTE);
hourList = new ArrayList();
minuteList = new ArrayList();
for (int i = 0; i < 24; i++) {
dateObject = new DateObject(hour+i,-1,true);
hourList.add(dateObject);
}
for (int j = 0; j < 60; j++) {
dateObject = new DateObject(-1,minute+j,false);
minuteList.add(dateObject);
}
//小时选择器
hours = new WheelView(context);
LayoutParams lparams_hours = new LayoutParams(80,LayoutParams.WRAP_CONTENT);
lparams_hours.setMargins(0, 0, MARGIN_RIGHT, 0);
hours.setLayoutParams(lparams_hours);
hours.setAdapter(new StringWheelAdapter(hourList, 24));
hours.setVisibleItems(3);
hours.setCyclic(true);
hours.addChangingListener(onHoursChangedListener);
addView(hours);
//分钟选择器
mins = new WheelView(context);
mins.setLayoutParams(new LayoutParams(80,LayoutParams.WRAP_CONTENT));
mins.setAdapter(new StringWheelAdapter(minuteList,60));
mins.setVisibleItems(3);
mins.setCyclic(true);
mins.addChangingListener(onMinsChangedListener);
addView(mins);
}
//listeners
private OnWheelChangedListener onHoursChangedListener = new OnWheelChangedListener(){
@Override
public void onChanged(WheelView hours, int oldValue, int newValue) {
calendar.set(Calendar.HOUR_OF_DAY, newValue);
change();
}
};
private OnWheelChangedListener onMinsChangedListener = new OnWheelChangedListener(){
@Override
public void onChanged(WheelView mins, int oldValue, int newValue) {
calendar.set(Calendar.MINUTE, newValue);
change();
}
};
/**
* 滑动改变监听器回调的接口
*/
public interface OnChangeListener {
void onChange(int hour, int munite);
}
/**
* 设置滑动改变监听器
* @param onChangeListener
*/
public void setOnChangeListener(OnChangeListener onChangeListener){
this.onChangeListener = onChangeListener;
}
/**
* 滑动最终调用的方法
*/
private void change(){
if(onChangeListener!=null){
onChangeListener.onChange(getHourOfDay(), getMinute());
}
}
/**
* 获取小时
* @return
*/
public int getHourOfDay(){
return hourList.get(hours.getCurrentItem()).getHour();
}
/**
* 获取分钟
* @return
*/
public int getMinute(){
return minuteList.get(mins.getCurrentItem()).getMinute();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
} 3.最后就可以直接使用了，我这里主界面是一个button,点击后弹出popupWindow显示日期选择器。布局文件及主Activity如下：
popupWindow布局文件：
