Android DatePicker和TimePicker：时间日期选择器-蒲公英云

Android SDK 提供了 DatePicker 和 TimePicker 组件，分别对日期和时间进行选择，方便日期和时间设定。

下面用一个简单的实例讲解 DatePicker 和 TimePicker 组件的使用方法。在工程 WidgetDemo 的布局文件 main.xml 中添加一个名为“Date/Time”的 Button，用以启动 TimeActivity。

在 main.xml 中添加代码如下：

<Button
android:id=”@+id/button6”
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:text=”Date/Time”/>

单击 Button 并启动 TimeActivity 的代码如下：

Button timebtn = (Button)this.findViewById(R.id.button6);
timebtn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v){
Intent intent = new Intent(WidgetDemoActivity.this, TimeActivity.class);
startActivity(intent);
}
});

同时在 AndroidManifest.xml 文件中声明该 Activity：

TimeActivity 的运行效果如图 1 所示。

图 1 TimeActivity的运行效果

TimeActivity 使用的布局文件为 time.xml，其内容如下：

<?xml version=”1.0” encoding=”utf-8”?>
<LinearLayout xmlns:android=”http://schemas.android.com/apk/res/android“
android:layout_width=”match_parent”
android:layout_height=”match_parent”
android:orientation=”vertical”>
<TextView
android:id=”@+id/timeview”
android:layout_width=”fill_parent”
android:layout_height=”wrap_content”
android:text=”DatePicker和TimePicker”/>
<TimePicker
android:id=”@+id/timepicker”
android:layout_width=”wrap_content”
android:layout_height=”116dp”
android:background=”#778888”/>
<DatePicker
android:id=”@+id/datepicker”
android:layout_width=”271dp”
android:layout_height=”196dp”
android:background=”#778899”/>

TimeActivity.java 的代码如下：

package introduction.android.widgetdemo;
import java.util.Calendar;
import android.app.Activity;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
public class TimeActivity extends Activity {
private TextView textview;
private TimePicker timepicker;
private DatePicker datepicker;
/* 声明日期及时间变量*/
private int year;
private int month;
private int day;
private int hour;
private int minute;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.time);
/*获取当前日期及时间 */
Calendar calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH);
day = calendar.get(Calendar.DAY_OF_MONTH);
hour = calendar.get(Calendar.HOUR);
minute = calendar.get(Calendar.MINUTE);
datepicker = (DatePicker) findViewById(R.id.datepicker);
timepicker = (TimePicker) findViewById(R.id.timepicker);
/* 设置TextView对象，显示初始日期时间 */
textview = (TextView) findViewById(R.id.timeview);
textview.setText(new StringBuilder().append(year).append(“/“)
.append(format(month + 1)).append(“/“)
.append(format(day)).append(“ “)
.append(format(hour)).append(“:”)
.append(format(minute)));
/* 设置OnDateChangedListener()*/
datepicker.init(year, month, day,
new DatePicker.OnDateChangedListener() {
@Override
public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
// TODO Auto-generated method stub
TimeActivity.this.year = year;
month = monthOfYear;
day = dayOfMonth;
textview.setText(new StringBuilder().append(year).
append(“/“).append(format(month + 1))
.append(“/“).append(format(day)).append(“ “)
.append(format(hour)).append(“:”)
.append(format(minute)));
}
});
timepicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
@Override
public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
// TODO Auto-generated method stub
hour = hourOfDay;
TimeActivity.this.minute = minute;
textview.setText(new StringBuilder().append(year)
.append(“/“).append(format(month + 1))
.append(“/“).append(format(day)).append(“ “)
.append(format(hour)).append(“:”)
.append(format(minute)));
}
});
}
private String format(int time) {
String str = “” + time;
if (str.length() == 1)
str = “0” + str;
return str;
}
}