DatePickerDialog和TimePickerDialog（基于对话框显示时间和日期）

public class MainActivity extends Activity implements android.view.View.OnClickListener{

private Button date_button;
private Button time_button;
private Calendar calendar;
private TextView tv_date;
private TextView tv_time;

protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
       date_button=(Button) findViewById(R.id.date_button);
       time_button=(Button) findViewById(R.id.time_button);
       tv_date=(TextView) findViewById(R.id.tv_date);
       tv_time=(TextView) findViewById(R.id.tv_time);
      date_button.setOnClickListener(this);  //按下按钮显示日期对话框
      time_button.setOnClickListener(this);  //按下按钮显示时间对话框

//获取当前的年月日时分信息

calendar=Calendar.getInstance();
//显示日期对话框
   private void showDateDialog()

   {
   DatePickerDialog date_dialog=new DatePickerDialog(MainActivity.this, new OnDateSetListener() {

      @Override
      public void onDateSet(DatePicker view, int year, int monthOfYear,
            int dayOfMonth) {
         // TODO Auto-generated method stub
         tv_date.setText("现在日期："+year+"-"+(monthOfYear+1)+"-"+dayOfMonth);
      }
   }, calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH));

   date_dialog.show();
}
//显示时间对话框
private void showTimeDialog()
{
   TimePickerDialog time_dialog=new TimePickerDialog(MainActivity.this, new OnTimeSetListener() {

      @Override
      public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
         // TODO Auto-generated method stub
         tv_time.setText("现在时间："+hourOfDay+":"+minute);
      }
   }, calendar.get(Calendar.HOUR_OF_DAY), calendar.get(Calendar.MINUTE), true);
   time_dialog.show();
}

@Override
public void onClick(View v) {
   // TODO Auto-generated method stub
   switch(v.getId())
   {
     case R.id.date_button:
        showDateDialog();
        break;
     case R.id.time_button:
        showTimeDialog();
        break;
   }