为了让用户能够选择日期和时间，Android提供了日期、时间拾取器
关键代码

<DatePicker
        android:id="@+id/datachose"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TimePicker
        android:id="@+id/timechose"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

在activity中初始化组件

  private int year;
    private int month;
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //获取日期时间组件
        DatePicker datePicker=findViewById(R.id.datachose);
        TimePicker timePicker=findViewById(R.id.timechose);
        timePicker.setIs24HourView(true);//设置为24小时制
        
        //创建一个日历对象，用来获取年月日小时和分钟，此处的变量需要事先定义
        Calendar calendar=Calendar.getInstance();
        final int year=calendar.get(Calendar.YEAR);
        final int month=calendar.get(Calendar.MONTH);
        int day=calendar.get(Calendar.DAY_OF_MONTH);
        hour=calendar.get(Calendar.HOUR);
        minute=calendar.get(Calendar.MINUTE);
        
        //设置日期改变的监听
        datePicker.init(year, month, day, new DatePicker.OnDateChangedListener() {
            @Override
            public void onDateChanged(DatePicker datePicker, int i, int i1, int i2) {
                MainActivity.this.year=year;
                MainActivity.this.month=month;
                ...
            }
        });
        
        //设置时间改变的监听
        timePicker.setOnTimeChangedListener(new TimePicker.OnTimeChangedListener() {
            @Override
            public void onTimeChanged(TimePicker timePicker, int i, int i1) {
               ....
            }
        });
    }

至于如何改变选择器的样式，在下就不知道了