如何全屏显示微调框下拉菜单？

Question

我想全屏显示微调框。.我到达了我没有得到适当解决方案的地方。

XML

<Spinner
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="@style/spinner_style"
        android:layout_below="@+id/appbarlayouts"
        android:overlapAnchor="false"
        android:id="@+id/task_spinner"></Spinner>

Java

ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, categories) {

            @Override
            public View getDropDownView(int position, View convertView, ViewGroup parent)
            {
                View v = null;
                v = super.getDropDownView(position, null, parent);
                // If this is the selected item position

                if (position == selectedItem) {
                    v.setBackgroundColor(getResources().getColor(R.color.colorPrimaryDark));
                }
                else {
                    // for other views
                    v.setBackgroundColor(Color.WHITE);
                   // ((TextView) parent.getChildAt(position)).setTextColor(Color.BLACK);
                }

                return v;
            }
        };  // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        task_spinner.setAdapter(dataAdapter);

我的输出  我想显示下拉至底部视图，但目前未显示