DataPicker和上一节讲的TimePicker很相似。使用DatePicker，可以让用户选择一个特定的日期。下面展示如何使用DatePicker。
1、使用上一节的工程，BasicViews4，修改main.xml。
[html]
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button android:id="@+id/btnSet"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I am all set!"
android:onClick="onClick" />
<DatePicker android:id="@+id/datePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<TimePicker android:id="@+id/timePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
2、F11调试。竖屏模式显式DatePicker稍微有一些窄，按Ctrl+F11，可以更改屏幕的显示方向。
3、在BasicViews4Activity.java中添加一些代码
[java]
package net.learn2develop.BasicViews4;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;
import android.widget.TimePicker;
import android.widget.Toast;
public class BasicViews4Activity extends Activity {
TimePicker timePicker;
DatePicker datePicker;
int hour, minute;
int yr, month, day;
static final int TIME_DIALOG_ID = 0;
static final int DATE_DIALOG_ID = 1;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
timePicker = (TimePicker) findViewById(R.id.timePicker);
timePicker.setIs24HourView(true);
// showDialog(TIME_DIALOG_ID);
datePicker = (DatePicker) findViewById(R.id.datePicker);
//---get the current date---
Calendar today = Calendar.getInstance();
yr = today.get(Calendar.YEAR);
month = today.get(Calendar.MONTH);
day = today.get(Calendar.DAY_OF_MONTH);
showDialog(DATE_DIALOG_ID);
}
@Override
protected Dialog onCreateDialog(int id)
{
switch (id) {
case TIME_DIALOG_ID:
return new TimePickerDialog(
this, mTimeSetListener, hour, minute, false);
case DATE_DIALOG_ID:
return new DatePickerDialog(
this, mDateSetListener, yr, month, day);
}
return null;
}
private DatePickerDialog.OnDateSetListener mDateSetListener =
new DatePickerDialog.OnDateSetListener()
{
public void onDateSet(
DatePicker view, int year, int monthOfYear, int dayOfMonth)
{
yr = year;
month = monthOfYear;
day = dayOfMonth;
Toast.makeText(getBaseContext(),
"You have selected : " + (month + 1) +
"/" + day + "/" + year,
Toast.LENGTH_SHORT).show();
}
};
private TimePickerDialog.OnTimeSetListener mTimeSetListener =
new TimePickerDialog.OnTimeSetListener()
{
public void onTimeSet(
TimePicker view, int hourOfDay, int minuteOfHour)
{
hour = hourOfDay;
minute = minuteOfHour;
SimpleDateFormat timeFormat = new SimpleDateFormat("hh:mm aa");
Date date = new Date(0,0,0, hour, minute);
String strDate = timeFormat.format(date);
Toast.makeText(getBaseContext(),
"You have selected " + strDate,
Toast.LENGTH_SHORT).show();
}
};
public void onClick(View view) {
Toast.makeText(getBaseContext(),
"Date selected:" + (datePicker.getMonth() + 1) +
"/" + datePicker.getDayOfMonth() +
"/" + datePicker.getYear() + "\n" +
"Time selected:" + timePicker.getCurrentHour() +
":" + timePicker.getCurrentMinute(),
Toast.LENGTH_SHORT).show();
}
}
4、点击按钮。
