Android入门之时间日期控件

package com.jkxqj.helloandroid;

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

public class MainActivity extends Activity {

private DatePicker datePicker;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

datePicker = (DatePicker)findViewById(R.id.firstDatePicker);
datePicker.updateDate(2013, 8, 23);
}

class ButtonListener implements OnClickListener{
@Override
public void onClick(View v) {
int y = datePicker.getYear();
int m = datePicker.getMonth();
int d = datePicker.getDayOfMonth();
System.out.println("y:" + y + ",m" + m + ",d:" + d);
}

}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

<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" >

<AnalogClock
android:id="@+id/clock"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="64dp" />

<DatePicker
android:id="@+id/firstDatePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/clock"
android:layout_centerHorizontal="true"
android:layout_marginTop="17dp" />

</RelativeLayout>