Nexus 6(注意日期标题不会填满整个警报对话框)

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>

DatePickerFragment的onCreateDialog()

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,day).getTime();
                         sendResult(Activity.RESULT_OK,date);
                     }
                 })
                 .create();
        }