如何膨胀显示在手机顶部而不是底部的布局？

Question

我的代码OnCreateView扩展了BottomSheetDialogFragment，但它会出现在屏幕底部...
他们的方式/代码会改变其位置从下到上吗？ 请看这张图片：

这是我的代码ModalEvent.java ：

package com.example.khalessi_jb.reminderapplication;


import android.app.DatePickerDialog;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.design.widget.BottomSheetDialogFragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.DatePicker;
import android.widget.TextView;
import android.widget.TimePicker;
import java.util.Calendar;


public class ModalEvent extends BottomSheetDialogFragment implements View.OnClickListener {

TextView txtDateandTime;
Button btnsDateTime;
TextView txtTime;
Button btnTime;
Button btnCloseEvent;
Calendar calendar;
DatePickerDialog datePickerDialog;
TimePickerDialog timePickerDialog;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.modal_event,container,false);

    btnsDateTime = (Button) v.findViewById(R.id.btnDate);
    txtDateandTime =(TextView)v.findViewById(R.id.txtDate);
    btnTime =(Button)v.findViewById(R.id.btnTime);
    txtTime =(TextView)v.findViewById(R.id.txtTime);
    btnCloseEvent = (Button)v.findViewById(R.id.btnCloseEvent);

    btnsDateTime.setOnClickListener(this);
    btnCloseEvent.setOnClickListener(this);
    btnTime.setOnClickListener(this);
    return v;
}

@Override
public void onClick(View v) {
    if(v==btnTime){

        calendar = Calendar.getInstance();
        final int hour = calendar.get(Calendar.HOUR_OF_DAY);
        int minutes =calendar.get(Calendar.MINUTE);


        timePickerDialog = new TimePickerDialog(getContext(), new TimePickerDialog.OnTimeSetListener() {
            @Override
            public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
                String amPm;
                if(hourOfDay >= 12){

                    amPm="PM";
                }else{
                    amPm="AM";
                }
                if(hourOfDay > 12){

                    hourOfDay = hourOfDay - 12;
                }
                else if(hourOfDay  == 0){
                    hourOfDay=12;
                }

                txtTime.setText(String.format("%02d:%02d", hourOfDay, minute)+amPm);
            }
        },hour,minutes,false);
        timePickerDialog.show();

    }
    if(v==btnsDateTime){
        calendar = Calendar.getInstance();
        int daysss = calendar.get(Calendar.DAY_OF_MONTH);
        int monthss =calendar.get(Calendar.MONTH);
        int yearss =calendar.get(Calendar.YEAR);

        datePickerDialog = new DatePickerDialog(getContext(), new DatePickerDialog.OnDateSetListener() {
            @Override
            public void onDateSet(DatePicker view, int mYear, int mMonth, int mDay) {
                txtDateandTime.setText(mDay +"/" + (mMonth +1)+"/"+mYear);
            }
        },yearss,monthss,daysss);
        datePickerDialog.show();

    }
    if(v==btnCloseEvent){
        dismiss();

    }
}
}