DatePicker和TimePicker

  难点没什么难点，主要注意一下，DatePicker的OnDateChangeListener是在它的init方法中注册的。而TimePicker的OnTimeChangeListener是用setOnTimeChangeListener方法注册的。另外，有兴趣可以尝试一下DatePickerDialog和TimePickerDialog，其实很简单，采用以上两个是以弹出Dialog的方式来显示，这里不多做解释。

package com.kevin.datetime;

import java.util.Calendar;

import android.app.Activity;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.DatePicker.OnDateChangedListener;
import android.widget.TextView;
import android.widget.TimePicker;
import android.widget.TimePicker.OnTimeChangedListener;

public class Main extends Activity {
	private TextView tv_title;
	private DatePicker datePicker;
	private TimePicker timePicker;
	private int year;
	private int month;
	private int day;
	private int hour;
	private int minute;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    	Calendar calendar = Calendar.getInstance();
        year = calendar.get(Calendar.YEAR);
        month = calendar.get(Calendar.MONTH);
        day = calendar.get(Calendar.DAY_OF_MONTH);
        hour = calendar.get(Calendar.HOUR_OF_DAY);
        minute = calendar.get(Calendar.MINUTE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        tv_title = (TextView)findViewById(R.id.tv_title);
        updateDisplay();
        datePicker = (DatePicker)findViewById(R.id.datePicker1);
        // 以init设置初始值与onDateChangeListener
        datePicker.init(year, month, day, new OnDateChangedListener() {			
			@Override
			public void onDateChanged(DatePicker view, int year, int monthOfYear,
					int dayOfMonth) {
				Main.this.year = year;
				month = monthOfYear;
				day = dayOfMonth;
				// 更新textview
				updateDisplay();
			}
		});
        timePicker = (TimePicker) findViewById(R.id.timePicker1);
        timePicker.setIs24HourView(true);
        timePicker.setOnTimeChangedListener(new OnTimeChangedListener() {			
			@Override
			public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
				hour = hourOfDay;
				Main.this.minute = minute;
				updateDisplay();
			}
		});
    }
    // 更新textview   
    private void updateDisplay(){
    	tv_title.setText(new StringBuilder().append(year)
    			.append("/")
    			.append(month + 1)
    			.append("/")
    			.append(day)
    			.append(" ")
    			.append(hour)
    			.append(":")
    			.append(minute));
    }
}