DatePickerDialog用法及只显示年月隐藏日

在代码中用法：

private void showDatePicker() {
        //获取当前日期
        Calendar calendar = Calendar.getInstance();
        year = calendar.get(Calendar.YEAR);
        month = calendar.get(Calendar.MONTH);
        day = calendar.get(Calendar.DAY_OF_MONTH);
        
        //创建并显示DatePickerDialog
        DatePickerDialog dialog = new DatePickerDialog(this, Datelistener, year, month, day);
        dialog.show();
        
        //只显示年月，隐藏掉日
        DatePicker dp = findDatePicker((ViewGroup) dialog.getWindow().getDecorView());
        if (dp != null) {
            ((ViewGroup)((ViewGroup)dp.getChildAt(0)).getChildAt(0))
                                    .getChildAt(2).setVisibility(View.GONE);
            //如果想隐藏掉年，将getChildAt(2)改为getChildAt(0)
        }
    }

findDatePicker方法

private DatePicker findDatePicker(ViewGroup group) {
   if (group != null) {
      for (int i = 0, j = group.getChildCount(); i < j; i++) {
         View child = group.getChildAt(i);
         if (child instanceof DatePicker) {
            return (DatePicker) child;
         } else if (child instanceof ViewGroup) {
            DatePicker result = findDatePicker((ViewGroup) child);
            if (result != null)
               return result;
         }
      }
   }
   return null;
}

DateListener , new DatePickerDialog()时传入

private DatePickerDialog.OnDateSetListener Datelistener=new DatePickerDialog.OnDateSetListener()
{
   /**params：view：该事件关联的组件
    * params：myyear：当前选择的年
    * params：monthOfYear：当前选择的月
    * params：dayOfMonth：当前选择的日
    */
   @Override
   public void onDateSet(DatePicker view, int myyear, int monthOfYear, int dayOfMonth) {

      //修改year、month、day的变量值，以便以后单击按钮时，DatePickerDialog上显示上一次修改后的值
      year=myyear;
      month=monthOfYear;
      day=dayOfMonth;
      //更新日期
      updateDate();

   }
   //当DatePickerDialog关闭时，更新日期显示
   private void updateDate()
   {
      //在TextView上显示日期
      tvDate.setText(year+"年"+(month+1)+"月");
   }
};