Android Program Development: (11) Select the control -- 11.2 DatePicker

DataPicker is similar to the TimePicker mentioned in the previous section. DatePicker allows you to select a specific date. The following describes how to use DatePicker.

1. Use the project in the previous section, BasicViews4, and modify 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 debugging. In portrait mode, the explicit DatePicker is slightly narrower. Press Ctrl + F11 to change the display direction of the screen.

3. Add some code in BasicViews4Activity. java.

[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. click the button.