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)
    }
}
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