日期选择器(DatePicker)和时间选择器(TimePicker)的功能与用法
DatePicker和TimePicker都从FrameLayout派生而来，其中DatePicker供用户选择日期，而TimePicker则供用户选择时间。它们在FrameLayout的基础上提供了一些方法来获取当前用户所选择的日期和时间，如果程序需要获取用户所选择的日期和时间，则可通过为DatePicker添加OnDateChangeListener进行监听、为TimePicker添加OnTimeChangeListener进行监听来实现。
看看以下代码：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="选择购买本书的具体时间"/> <!-- 定义一个DatePicker组件 --><DatePicker android:id="@+id/dap" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"/><!-- 定义一个TimePicker组件 --><TimePicker android:id="@+id/tip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_horizontal"/><!-- 显示用户输入日期、时间的控件 --><EditText android:id="@+id/show" android:layout_width="match_parent" android:layout_height="wrap_content" android:editable="false" android:cursorVisible="false"/></LinearLayout>
import java.util.Calendar;import android.app.Activity;import android.os.Bundle;import android.widget.DatePicker;import android.widget.DatePicker.OnDateChangedListener;import android.widget.EditText;import android.widget.TimePicker;import android.widget.TimePicker.OnTimeChangedListener;public class DatePickerActivity extends Activity {private int year;private int month;private int day;private int hour;private int minute;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.datepicker);DatePicker datepicker = (DatePicker) findViewById(R.id.dap);TimePicker timepicker = (TimePicker) findViewById(R.id.tip);// 获取当前的年、月、日、小时、分钟Calendar c = Calendar.getInstance();year = c.get(Calendar.YEAR);month = c.get(Calendar.MONTH);day = c.get(Calendar.DAY_OF_MONTH);hour = c.get(Calendar.HOUR);minute = c.get(Calendar.MINUTE);// 初始化DatePicker组件，初始化时指定监听器datepicker.init(year, month, day, new OnDateChangedListener() {@Overridepublic void onDateChanged(DatePicker arg0, int year, int month,int day) {// TODO Auto-generated method stubDatePickerActivity.this.year = year;DatePickerActivity.this.month = month;DatePickerActivity.this.day = day;// 显示当前的日期、时间showDate(year, month, day, hour, minute);}});// 为TimePicker指定监听吕timepicker.setOnTimeChangedListener(new OnTimeChangedListener() {@Overridepublic void onTimeChanged(TimePicker view, int hourOfDay, int minute) {// TODO Auto-generated method stubDatePickerActivity.this.hour = hourOfDay;DatePickerActivity.this.minute = minute;//显示当前日期、时间showDate(year, month, day, hour, minute);}});}//定义在EditText中显示当前日期、时间的方法private void showDate(int year, int month, int day, int hour, int minute) {// TODO Auto-generated method stubEditText show = (EditText) findViewById(R.id.show);show.setText("您购买的日期为：" + year + "年" + (month + 1) + "月" + day + "日"+ hour + "时" + minute + "分");}}