DatePicker View android exam

Like the TimePicker view, the DatePicker view allows users to select a date. Modify the datetimepicker.xml file as follows:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >         
 
    <DatePicker
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />   
 
</LinearLayout>

Remove the following statement added in the previous section:

@Override  
    protected void onCreate(Bundle savedInstanceState) 
    {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.datetimepicker);
         //---remove this line---         
         //showDialog(TIME_DIALOG_ID);        
    }

Press F11 to debug the application on the Android emulator. Figure 3 shows the DatePicker view in action. Besides touching the “+” and “-“ buttons, you can also use the numeric keypad on the device to change the month, day, and year.

Figure 3: The DatePicker view in action

Displaying the DatePicker View in a Dialog Window

You can also display the DatePicker view in a dialog. Modify the DateTimePickerExample.java file as shown below:

package net.learn2develop.AndroidViews;
 
import android.app.Activity;
import android.app.DatePickerDialog;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.TimePicker;
import android.widget.Toast;
 
public class DateTimePickerExample extends Activity 
{
    int hour, minute;
    int Year, month, day;
 
    static final int TIME_DIALOG_ID = 0;
    static final int DATE_DIALOG_ID = 1;
 
    @Override  
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);        
        setContentView(R.layout.datetimepicker);
        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, Year, month, day);
        }
        return null;    
    }
 
    private TimePickerDialog.OnTimeSetListener mTimeSetListener =
        new TimePickerDialog.OnTimeSetListener() 
    {   
        //...
    };
 
    private DatePickerDialog.OnDateSetListener mDateSetListener =
    new DatePickerDialog.OnDateSetListener() 
    {
        public void onDateSet(DatePicker view, int year, int monthOfYear,
                int dayOfMonth) 
        {
            Year = year;
            month = monthOfYear;
            day = dayOfMonth;
            Toast.makeText(getBaseContext(), 
                    "You have selected : " + (month + 1) +
                    "/" + day + "/" + Year,
                    Toast.LENGTH_SHORT).show();
        }
    };
}

The above program displays the DatePickerDialog when the activity is created. When the date is set, the set date is displayed using the Toast class. Figure 4 shows the DatePickerDialog in action.

Figure 4: The DatePickerDialog in action