main.xml ( activities defined GUI in xml)

<?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>

BasicViews4Activity.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);

                  //handles to timePicker and datePicker

                   timePicker = (TimePicker) findViewById(R.id.timePicker);
 	              timePicker.setIs24HourView(true);

                   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);    //show the Dialog for DateDailogPicker
                  //could add call to showDialog(TIME_DIALOG_ID);
 	        }

 

             //called by showDialog above
             @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;
 	        }

            
             //instance of private anonymous class to be OnDateSetListener for our DatePickerDialog defined above
             // onDateSet(*) method will be invoked when user sets Date in the corresponding DatePickerDialog
             private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener()
 	         {
       	        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth)
 	              {
 	                    yr = year;  //assign the user selected values passed to this method
 	                    month = monthOfYear;
             	        day = dayOfMonth;
             	        Toast.makeText(getBaseContext(),"You have selected : " + (month + 1) +
                                             "/" + day + "/" + year, Toast.LENGTH_SHORT).show();
 	              }
 	         };

             //instance of private anonymous class to be OnTimeSetListener for our TimePickerDialog defined above
             // onTimeSet(*) method will be invoked when user sets Time in the corresponding TimePickerDialog
             private TimePickerDialog.OnTimeSetListener mTimeSetListener = new TimePickerDialog.OnTimeSetListener()
 	         {
 	              public void onTimeSet( TimePicker view, int hourOfDay, int minuteOfHour)
 	                {
 	                    hour = hourOfDay;   //assign the user selected values passed to this method
 	                    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(); 
 	                }
 	         };

 
            //event handler for Button in GUI of this Activity defined in xml file --shows date and timeinfo

             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();
 	        }

}