DatePicker Widget does not take up entire AlertDialog on Nexus 6

Question

I have a DatePickerFragment that uses a very simple custom layout. The layout takes up the entire alert dialog on smaller devices (HTC One m7), but does not on the Nexus 6. Does anyone know why the DatePicker does not take up the entire width of the Nexus 6 Alert Dialog or where to begin troubleshooting? Thank you!

Nexus 6 (notice that date header does not fill the entire alert dialog)

HTC One m7

dialog_date.xml

<?xml version="1.0" encoding="utf-8"?>
<DatePicker xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/dialog_date_date_picker"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:calendarViewShown="false">
</DatePicker>

onCreateDialog() of DatePickerFragment

public Dialog onCreateDialog(Bundle savedInstanceState) {
        Date date = (Date) getArguments().getSerializable(ARG_DATE);

        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);

        View v = LayoutInflater.from(getActivity())
                 .inflate(R.layout.dialog_date, null);

        mDatePicker = (DatePicker)
  v.findViewById(R.id.dialog_date_date_picker);
        mDatePicker.init(year, month, day, null);

        return new AlertDialog.Builder(getActivity())
                 .setView(v)
//                     .setTitle(R.string.date_picker_title)
                 .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         int year = mDatePicker.getYear();
                         int month = mDatePicker.getMonth();
                         int day = mDatePicker.getDayOfMonth();
                         Date date = new GregorianCalendar(year, month, day).getTime();
                         sendResult(Activity.RESULT_OK, date);
                     }
                 })
                 .create();
        }

Answer 1

The reason is AlertDialog takes more space than the child DatePicker.

Make sure to use dialog theme (ex. Theme.AppCompat.Light.Dialog) without .Alert suffix.