DatePicker Widget不会占用Nexus 6上的整个AlertDialog

Question

我有一个使用非常简单的自定义布局的DatePickerFragment.布局占用较小设备(HTC One m7)上的整个警报对话框,但不在Nexus 6上.有人知道为什么DatePicker不占用Nexus 6警报对话框的整个宽度或从哪里开始排除故障？谢谢!

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

Answer 1

原因是AlertDialog比子DatePicker占用更多空间.

确保使用Theme.AppCompat.Light.Dialog没有.Alert后缀的对话框主题(例如).

Answer 2

我无法使用 nitzanj 的建议来让它工作，但我改变了创建 DatePickerDialog 的方式，它现在按预期工作。完整的来源如下。主要区别在于 onCreateDialog。

public class DatePickerFragment extends DialogFragment
        implements DatePickerDialog.OnDateSetListener{

    public static final String EXTRA_DATE =
            "com.amicly.acaringtext.date";

    private static final String ARG_DATE = "date";

    @NonNull
    @Override
    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);

        return new DatePickerDialog(getActivity(), this, year, month, day);
    }

    public static DatePickerFragment newInstance(Date date) {
        Bundle args = new Bundle();
        args.putSerializable(ARG_DATE, date);
        DatePickerFragment fragment = new DatePickerFragment();
        fragment.setArguments(args);
        return fragment;
    }

    private void sendResult(int resultCode, Date date) {
        if (getTargetFragment() == null) {
            return;
        }
        Intent intent = new Intent();
        intent.putExtra(EXTRA_DATE, date);

        getTargetFragment().
                onActivityResult(getTargetRequestCode(), resultCode, intent);
    }

    @Override
    public void onDateSet(DatePicker datePicker, int year, int month, int day) {
        Date date = new GregorianCalendar(year, month, day).getTime();
        sendResult(Activity.RESULT_OK, date);
    }
}