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。
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<DateObject> list;
// length
private int length;
/**
* Constructor
* @param items the items
* @param length the max items length
*/
public StringWheelAdapter(ArrayList<DateObject> 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<DateObject> 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<DateObject>();
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<DateObject> 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<DateObject>();
minuteList = new ArrayList<DateObject>();
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：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:background="#FFF"> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#f5f5f5"/> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:padding="10dp"> <TextView android:id="@+id/tv_cancel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="取消" android:layout_marginLeft="10dp" android:layout_alignParentLeft="true" android:textColor="#000000" android:textSize="20sp" /> <TextView android:id="@+id/tv_ok" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="确定" android:layout_marginRight="10dp" android:layout_alignParentRight="true" android:textColor="#000000" android:textSize="20sp" /> </RelativeLayout> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#f5f5f5"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_marginTop="10dp" android:padding="20dp"> <com.sxkeji.timeswitch.widget.DatePicker android:id="@+id/dp_test" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="3" android:gravity="center" android:layout_gravity="center_horizontal"/> <com.sxkeji.timeswitch.widget.TimePicker android:id="@+id/tp_test" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="2" android:gravity="center" android:layout_gravity="center_horizontal"/> </LinearLayout> </LinearLayout>
主界面布局文件:
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFF" android:id="@+id/Rl_all"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" android:layout_alignParentBottom="true" android:padding="10dp" android:gravity="center"> <View android:layout_width="match_parent" android:layout_height="1dp" android:background="#f5f5f5"/> <Button android:id="@+id/btn_naozhong" android:layout_width="30dp" android:layout_height="30dp" android:background="@drawable/naozhong" /> </LinearLayout> </RelativeLayout>
Activity代码：
package com.sxkeji.timeswitch.activity;
import java.util.Calendar;
import org.unism.wang.R;
import com.sxkeji.timeswitch.widget.DatePicker;
import com.sxkeji.timeswitch.widget.TimePicker;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.PopupWindow;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
/**
* 主页面
* @author sxzhang
*/
public class MyPickerActivity extends Activity {
private Calendar calendar;
private DatePicker dp_test;
private TimePicker tp_test;
private TextView tv_ok,tv_cancel; //确定、取消button
private Button btn_naozhong;
private PopupWindow pw;
private String selectDate,selectTime;
//选择时间与当前时间，用于判断用户选择的是否是以前的时间
private int currentHour,currentMinute,currentDay,selectHour,selectMinute,selectDay;
//整体布局
private RelativeLayout Rl_all;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Rl_all = (RelativeLayout) findViewById(R.id.Rl_all);
btn_naozhong = (Button) findViewById(R.id.btn_naozhong);
calendar = Calendar.getInstance();
btn_naozhong.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
View view = View.inflate(MyPickerActivity.this, R.layout.dialog_select_time, null);
selectDate = calendar.get(Calendar.YEAR) + "年" + calendar.get(Calendar.MONTH) + "月"
+ calendar.get(Calendar.DAY_OF_MONTH) + "日"
+ DatePicker.getDayOfWeekCN(calendar.get(Calendar.DAY_OF_WEEK));
//选择时间与当前时间的初始化，用于判断用户选择的是否是以前的时间，如果是，弹出toss提示不能选择过去的时间
selectDay = currentDay = calendar.get(Calendar.DAY_OF_MONTH);
selectMinute = currentMinute = calendar.get(Calendar.MINUTE);
selectHour = currentHour = calendar.get(Calendar.HOUR_OF_DAY);
selectTime = currentHour + "点" + ((currentMinute < 10)?("0"+currentMinute):currentMinute) + "分";
dp_test = (DatePicker)view.findViewById(R.id.dp_test);
tp_test = (TimePicker)view.findViewById(R.id.tp_test);
tv_ok = (TextView) view.findViewById(R.id.tv_ok);
tv_cancel = (TextView) view.findViewById(R.id.tv_cancel);
//设置滑动改变监听器
dp_test.setOnChangeListener(dp_onchanghelistener);
tp_test.setOnChangeListener(tp_onchanghelistener);
pw = new PopupWindow(view, LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT, true);
// //设置这2个使得点击pop以外区域可以去除pop
// pw.setOutsideTouchable(true);
// pw.setBackgroundDrawable(new BitmapDrawable());
//出现在布局底端
pw.showAtLocation(Rl_all, 0, 0, Gravity.END);
//点击确定
tv_ok.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
if(selectDay == currentDay ){ //在当前日期情况下可能出现选中过去时间的情况
if(selectHour < currentHour){
Toast.makeText(getApplicationContext(), "不能选择过去的时间\n 请重新选择", 0).show();
}else if( (selectHour == currentHour) && (selectMinute < currentMinute) ){
Toast.makeText(getApplicationContext(), "不能选择过去的时间\n 请重新选择", 0).show();
}else{
Toast.makeText(getApplicationContext(), selectDate+selectTime, 0).show();
pw.dismiss();
}
}else{
Toast.makeText(getApplicationContext(), selectDate+selectTime, 0).show();
pw.dismiss();
}
}
});
//点击取消
tv_cancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
pw.dismiss();
}
});
}
});
}
//listeners
DatePicker.OnChangeListener dp_onchanghelistener = new DatePicker.OnChangeListener() {
@Override
public void onChange(int year, int month, int day, int day_of_week) {
selectDay = day;
selectDate = year + "年" + month + "月" + day + "日" + DatePicker.getDayOfWeekCN(day_of_week);
}
};
TimePicker.OnChangeListener tp_onchanghelistener = new TimePicker.OnChangeListener() {
@Override
public void onChange(int hour, int minute) {
selectTime = hour + "点" + ((minute < 10)?("0"+minute):minute) + "分";
selectHour = hour;
selectMinute = minute;
}
};
}Android是一种基于Linux内核的自由及开放源代码的操作系统，主要使用于移动设备，如智能手机和平板电脑，由美国Google公司和开放手机联盟领导及开发。
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