我们再来看具体的实现代码：

package ling.android.DatePikerDialog02;
import java.util.Calendar;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
public class DatePikerDialog02 extends Activity {
/*
* 这些都是和mars老师的视频教程相同，大家有兴趣可以看看
*/
private Button setButton;
private TextView myText;
private static final int DATE_PICKER_ID=1;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setButton=(Button)findViewById(R.id.setButton);
setButton.setOnClickListener(new setButtonListener());
myText=(TextView)findViewById(R.id.myText);
}
class setButtonListener implements OnClickListener
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
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
/*
* 这里通过蔡勒公式算出某一天是星期几
*/
int y=year-1;
int m=monthOfYear;
int c=20;
int d=dayOfMonth+12;
int w=(y+(y/4)+(c/4)-2*c+(26*(m+1)/10)+d-1)%7;
String myWeek = null;
switch(w)
{
case 0:
myWeek="日";
break;
case 1:
myWeek="一";
break;
case 2:
myWeek="二";
break;
case 3:
myWeek="三";
break;
case 4:
myWeek="四";
break;
case 5:
myWeek="五";
break;
case 6:
myWeek="六";
break;
default:
break;
}
myText.setText(year+"年"+(monthOfYear+1)+"月"+dayOfMonth+"日"+"周"+myWeek);
}

};
@Override
protected Dialog onCreateDialog(int id) {
// TODO Auto-generated method stub
switch(id)
{
case DATE_PICKER_ID:
//通过Calendar中的方法得到当前系统的日期
return new DatePickerDialog(this,onDateSetListener
,Calendar.getInstance().get(Calendar.YEAR)
,Calendar.getInstance().get(Calendar.MONTH)
,Calendar.getInstance().get(Calendar.DAY_OF_MONTH));
}
return super.onCreateDialog(id);
}

}