<Button

       android:id="@+id/showDatePickerButton"

       android:text="@string/calendar"

       android:layout_width="wrap_content"

       android:layout_height="wrap_content" />

package leihu.date_and_time;

import android.os.Bundle;

import android.app.Activity;

import android.app.DatePickerDialog;

import android.app.Dialog;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.DatePicker;

public class MainActivity extends Activity {

         private Button showDatePickerButton = null;

         //该常量用于标识DatePickerDialog

         private static final int DATE_PICKER_ID = 1;

         @Override

         protected void onCreate(Bundle savedInstanceState) {

                   super.onCreate(savedInstanceState);

                   setContentView(R.layout.activity_main);

                   showDatePickerButton = (Button)findViewById

(R.id.showDatePickerButton);

                   showDatePickerButton.setOnClickListener(new ButtonListener());

         }

         private class ButtonListener implements OnClickListener{

                   @Override

                   public void onClick(View v) {

                            // TODO Auto-generated method stub

                            //此方法用于显示DatePickerDialog

                            showDialog(DATE_PICKER_ID);

                   }

         }

         DatePickerDialog.OnDateSetListener onDateSetListener = new

DatePickerDialog.OnDateSetListener() {

                   @Override

                   public void onDateSet(DatePicker view, int year, int monthOfYear,

                                     int dayOfMonth) {

                            // TODO Auto-generated method stub

                            System.out.println(year+"-"+monthOfYear+"—"+dayOfMonth);

                   }

         };

         protected Dialog onCreateDialog(int id){

                   switch(id){

                   case DATE_PICKER_ID:

                            return new DatePickerDialog

(this,onDateSetListener,2012,11,21);

                   }

                   return null;

         }

}