Android 程式开发：（十一）选择控件 —— 11.2 DatePicker

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。

<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">

<Buttonandroid:id="@+id/btnSet"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Iamallset!"
android:onClick="onClick"/>

<DatePickerandroid:id="@+id/datePicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

<TimePickerandroid: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

packagenet.learn2develop.BasicViews4;

importjava.text.SimpleDateFormat;
importjava.util.Calendar;
importjava.util.Date;

importandroid.app.Activity;
importandroid.app.DatePickerDialog;
importandroid.app.Dialog;
importandroid.app.TimePickerDialog;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.widget.DatePicker;
importandroid.widget.TimePicker;
importandroid.widget.Toast;

publicclassBasicViews4ActivityextendsActivity{
TimePickertimePicker;
DatePickerdatePicker;

inthour,minute;
intyr,month,day;

staticfinalintTIME_DIALOG_ID=0;
staticfinalintDATE_DIALOG_ID=1;

/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
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);

//---getthecurrentdate---
Calendartoday=Calendar.getInstance();
yr=today.get(Calendar.YEAR);
month=today.get(Calendar.MONTH);
day=today.get(Calendar.DAY_OF_MONTH);

showDialog(DATE_DIALOG_ID);
}

@Override
protectedDialogonCreateDialog(intid)
{
switch(id){
caseTIME_DIALOG_ID:
returnnewTimePickerDialog(
this,mTimeSetListener,hour,minute,false);
caseDATE_DIALOG_ID:
returnnewDatePickerDialog(
this,mDateSetListener,yr,month,day);

}
returnnull;
}

privateDatePickerDialog.OnDateSetListenermDateSetListener=
newDatePickerDialog.OnDateSetListener()
{
publicvoidonDateSet(
DatePickerview,intyear,intmonthOfYear,intdayOfMonth)
{
yr=year;
month=monthOfYear;
day=dayOfMonth;
Toast.makeText(getBaseContext(),
"Youhaveselected:"+(month+1)+
"/"+day+"/"+year,
Toast.LENGTH_SHORT).show();
}
};

privateTimePickerDialog.OnTimeSetListenermTimeSetListener=
newTimePickerDialog.OnTimeSetListener()
{
publicvoidonTimeSet(
TimePickerview,inthourOfDay,intminuteOfHour)
{
hour=hourOfDay;
minute=minuteOfHour;

SimpleDateFormattimeFormat=newSimpleDateFormat("hh:mmaa");
Datedate=newDate(0,0,0,hour,minute);
StringstrDate=timeFormat.format(date);

Toast.makeText(getBaseContext(),
"Youhaveselected"+strDate,
Toast.LENGTH_SHORT).show();
}
};

publicvoidonClick(Viewview){
Toast.makeText(getBaseContext(),
"Dateselected:"+(datePicker.getMonth()+1)+
"/"+datePicker.getDayOfMonth()+
"/"+datePicker.getYear()+"\n"+
"Timeselected:"+timePicker.getCurrentHour()+
":"+timePicker.getCurrentMinute(),
Toast.LENGTH_SHORT).show();
}

}

4、点击按钮。