Android中DatePicker与TimePicker用法讲解（包括DatePickerDialog与TimePickerDialog）

实现效果：将DatePicker和TimePicker修改的日期和时间实时显示在程序标题栏上。

1.通过DatePicker和TimePicker来实现

布局为main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <DatePicker
        android:id="@+id/datePicker"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TimePicker
        android:id="@+id/timePicker"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

MainActivity.java

import java.util.Calendar;
import android.support.v7.app.ActionBarActivity;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

public class MainActivity extends ActionBarActivity {
    private TimePicker timePicker;
    private DatePicker datePicker;
    private Calendar cal;
    private int year, month, day;
    private int hour, minute;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //获取日历的一个对象
        cal = Calendar.getInstance();

        //获取年月日时分秒的信息
        year = cal.get(Calendar.YEAR);
        //month从0开始计算(一月month = 0)
        month = cal.get(Calendar.MONTH)+1;
        day = cal.get(Calendar.DAY_OF_MONTH);
        hour = cal.get(Calendar.HOUR_OF_DAY);
        minute = cal.get(Calendar.MINUTE);

        //设置标题
        setTitle(year+"-"+month+"-"+day+" "+hour+":"+minute);

        datePicker = (DatePicker) findViewById(R.id.datePicker);
        timePicker = (TimePicker) findViewById(R.id.timePicker);

        //datePicker的初始化
        datePicker.init(year,  cal.get(Calendar.MONTH), day, new OnDateChangedListener() {
            @Override
            public void onDateChanged(DatePicker view, int year, int monthOfYear,int dayOfMonth) {
                //monthOfYear从0计算
                setTitle(year+"-"+(monthOfYear+1)+"-"+dayOfMonth);
            }
        });

        timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {
            @Override
            public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
                setTitle(hourOfDay+":"+minute);
            }
        });
　　}
}

首先建立Calendar对象来获取当前的系统时间和日期，然后设置在程序标题栏上，注意cal.get(Calendar.MONTH)返回的值从0开始，即返回0时代表一月。

DatePicker初始化调用public void init(int year, int monthOfYear, int dayOfMonth, OnDateChangedListener onDateChangedListener),最后一个参数为DatePicker的监听器。TimePicker直接设置监听器。

运行截图

更改DatePicker

更改TimePicker

2.使用Dialog,更加美观

布局为main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

</LinearLayout>

没有加入任何控件

MainActivity.java

import java.util.Calendar;

import android.support.v7.app.ActionBarActivity;
import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.app.TimePickerDialog;
import android.app.TimePickerDialog.OnTimeSetListener;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

public class MainActivity extends ActionBarActivity {private Calendar cal;
    private int year, month, day;
    private int hour, minute;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        //获取日历的一个对象
        cal = Calendar.getInstance();

        //获取年月日时分秒的信息
        year = cal.get(Calendar.YEAR);
        //month从0开始计算(一月month = 0)
        month = cal.get(Calendar.MONTH)+1;
        day = cal.get(Calendar.DAY_OF_MONTH);
        hour = cal.get(Calendar.HOUR_OF_DAY);
        minute = cal.get(Calendar.MINUTE);

        //设置标题
        setTitle(year+"-"+month+"-"+day+" "+hour+":"+minute);
        //日历选择器的对话框形式
        new DatePickerDialog(this, new OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
                setTitle(year+"-"+(monthOfYear+1)+"-"+dayOfMonth);
            }
        },year, cal.get(Calendar.MONTH), day).show(); 

        //时间选择器的对话框形式(最后一个参数is24HourView，是否为24小时制)
        new TimePickerDialog(this, new OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                setTitle(hourOfDay+":"+minute);
            }
        }, hour, minute, true).show();
    }

}

使用匿名类的方式，直接创建DatePickerDialog和TimePickerDialog对象，构造方法如下

public DatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth)

public TimePickerDialog(Context context, OnTimeSetListener callBack, int hourOfDay, int minute, boolean is24HourView)

直接在构造方法中使用匿名内部类的方法添加监听器，is24HourView是个boolean类型的值，来表示是否使用24小时制。

运行截图

总结：

注意使用cal.get(Calendar.MONTH)得到的值会比真实的月份值小1，在setTitle时需要加1，而在传入到DatePicker的初始化方法和DatePickerDialog的构造方法时应该直接传入。

建议在这两个方法内直接写cal.get(Calendar.MONTH)，不要用自定义变量month。