控件_DatePicker

 import android.app.Activity;
 import android.os.Bundle;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
 import android.widget.DatePicker;

 public class MainActivity extends Activity {
     private DatePicker datepicker;
     private Button button;
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

         datepicker = (DatePicker) findViewById(R.id.datepicker);

         datepicker.updateDate(2013, 8, 11);//设置默认的时间，不设置默认的就是当前时间，8表示的是7月份，因为java中月份是从0开始的
         button = (Button) findViewById(R.id.button);
         button.setOnClickListener(new ButtonListener());

     }
     class ButtonListener implements OnClickListener{
         public void onClick(View v) {
             int year = datepicker.getYear();
             int month = datepicker.getMonth();
             int date = datepicker.getDayOfMonth();
             System.out.println("year="+year+",month="+month+",date="+date);
         }

     }

 }

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:paddingBottom="@dimen/activity_vertical_margin"
     android:paddingLeft="@dimen/activity_horizontal_margin"
     android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
     tools:context=".MainActivity" >

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

      <Button
          android:id="@+id/button"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:layout_below="@id/datepicker"
          android:text="获取当前时间"
          />"

 </RelativeLayout>