示意图：

layout布局文件：xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:text="DatePicker(日期选择器):"
            android:textSize="24sp"
            />

        <DatePicker
            android:id="@+id/btnDp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
        <DatePicker
            android:calendarTextColor="#ff00ff"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:datePickerMode="spinner"
            android:headerBackground="#ff00ff00"
            />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="TimePicker(时间选择器)"
            android:textSize="24sp"
            android:gravity="center"
            />
        <TimePicker
            android:id="@+id/btnTp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"/>
        
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="CalendarView(日历视图)"
            android:textSize="24sp"
            android:gravity="center"
            />
        <CalendarView
            android:id="@+id/btnCv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
        
    </LinearLayout>


</ScrollView>

MainActivity：

package com.example.mydate;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.CalendarView;
import android.widget.DatePicker;
import android.widget.TimePicker;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements  DatePicker.OnDateChangedListener,
         CalendarView.OnDateChangeListener,TimePicker.OnTimeChangedListener{
    //定义组件 都继承 FrameLayout 帧布局
    private DatePicker datePicker;

    private TimePicker timePicker;
    
    private CalendarView calendarView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        datePicker = findViewById(R.id.btnDp);
        timePicker = findViewById(R.id.btnTp);
        calendarView = findViewById(R.id.btnCv);
        //绑定事件 日期
        datePicker.setOnDateChangedListener(this);

        //时间
        timePicker.setOnTimeChangedListener(this);
        
        //日期
        calendarView.setOnDateChangeListener(this);
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
        Toast.makeText(this,year+"-年-"+(monthOfYear+1)+"-月-"+dayOfMonth+"-日",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onTimeChanged(TimePicker view, int hourOfDay, int minute) {
        Toast.makeText(this,hourOfDay+"-小时"+minute+"-分钟-",Toast.LENGTH_SHORT).show();

    }

    @Override
    public void onSelectedDayChange(@NonNull CalendarView view, int year, int month, int dayOfMonth) {
        Toast.makeText(this,"您选择了"+year+"-年-"+(month+1)+"-月-"+dayOfMonth+"-日",Toast.LENGTH_SHORT).show();

    }
}