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The former exercise show a "Simple example of using DatePicker with both calendar view and spinners". We can show/hide calendar view and spinners individually in XML with android:calendarViewShown and android:spinnersShown attributes. Introduced in API level 11, we can also program it using Java code with setCalendarViewShown() and setSpinnersShown() methods.

Options for DatePicker to display or hide calendar view and spinners

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />
    <RadioGroup
        android:id="@+id/optGroup"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <RadioButton
            android:id="@+id/optCalendar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="CalendarView" 
            android:checked="true" />
        <RadioButton
            android:id="@+id/optSpinners"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Spinners" />
        <RadioButton
            android:id="@+id/optBoth"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Both" />
  </RadioGroup>
    <DatePicker
        android:id="@+id/pickerdate"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:calendarViewShown="true"
        android:spinnersShown="false" />

</LinearLayout>

package com.example.androiddatepickershown;

import android.os.Bundle;
import android.widget.DatePicker;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.app.Activity;

public class MainActivity extends Activity {
 
 RadioGroup groupBtn;
 RadioButton btnCalendar, btnSpinners, btnBoth;
 DatePicker pickerDate;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  groupBtn = (RadioGroup)findViewById(R.id.optGroup);
  btnCalendar = (RadioButton)findViewById(R.id.optCalendar);
  btnSpinners = (RadioButton)findViewById(R.id.optSpinners);
  btnBoth = (RadioButton)findViewById(R.id.optBoth);
  pickerDate = (DatePicker)findViewById(R.id.pickerdate);
  
  groupBtn.setOnCheckedChangeListener(new OnCheckedChangeListener(){

   @Override
   public void onCheckedChanged(RadioGroup arg0, int arg1) {
    if(btnCalendar.isChecked()){
     pickerDate.setCalendarViewShown(true);
     pickerDate.setSpinnersShown(false);
    }else if(btnSpinners.isChecked()){
     pickerDate.setCalendarViewShown(false);
     pickerDate.setSpinnersShown(true);
    }else{
     pickerDate.setCalendarViewShown(true);
     pickerDate.setSpinnersShown(true);
    }
   }});
 }

}